Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can distribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License (Version 2) as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 11 | * for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * VPE support module |
| 20 | * |
| 21 | * Provides support for loading a MIPS SP program on VPE1. |
| 22 | * The SP enviroment is rather simple, no tlb's. It needs to be relocatable |
| 23 | * (or partially linked). You should initialise your stack in the startup |
| 24 | * code. This loader looks for the symbol __start and sets up |
| 25 | * execution to resume from there. The MIPS SDE kit contains suitable examples. |
| 26 | * |
| 27 | * To load and run, simply cat a SP 'program file' to /dev/vpe1. |
| 28 | * i.e cat spapp >/dev/vpe1. |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 29 | */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 30 | #include <linux/kernel.h> |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 31 | #include <linux/device.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 32 | #include <linux/module.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/list.h> |
| 38 | #include <linux/vmalloc.h> |
| 39 | #include <linux/elf.h> |
| 40 | #include <linux/seq_file.h> |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 41 | #include <linux/smp_lock.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 42 | #include <linux/syscalls.h> |
| 43 | #include <linux/moduleloader.h> |
| 44 | #include <linux/interrupt.h> |
| 45 | #include <linux/poll.h> |
| 46 | #include <linux/bootmem.h> |
| 47 | #include <asm/mipsregs.h> |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 48 | #include <asm/mipsmtregs.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 49 | #include <asm/cacheflush.h> |
| 50 | #include <asm/atomic.h> |
| 51 | #include <asm/cpu.h> |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 52 | #include <asm/mips_mt.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 53 | #include <asm/processor.h> |
| 54 | #include <asm/system.h> |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 55 | #include <asm/vpe.h> |
| 56 | #include <asm/kspd.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 57 | |
| 58 | typedef void *vpe_handle; |
| 59 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 60 | #ifndef ARCH_SHF_SMALL |
| 61 | #define ARCH_SHF_SMALL 0 |
| 62 | #endif |
| 63 | |
| 64 | /* If this is set, the section belongs in the init part of the module */ |
| 65 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
| 66 | |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 67 | /* |
| 68 | * The number of TCs and VPEs physically available on the core |
| 69 | */ |
| 70 | static int hw_tcs, hw_vpes; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 71 | static char module_name[] = "vpe"; |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 72 | static int major; |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 73 | static const int minor = 1; /* fixed for now */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 74 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 75 | #ifdef CONFIG_MIPS_APSP_KSPD |
| 76 | static struct kspd_notifications kspd_events; |
| 77 | static int kspd_events_reqd = 0; |
| 78 | #endif |
| 79 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 80 | /* grab the likely amount of memory we will need. */ |
| 81 | #ifdef CONFIG_MIPS_VPE_LOADER_TOM |
| 82 | #define P_SIZE (2 * 1024 * 1024) |
| 83 | #else |
| 84 | /* add an overhead to the max kmalloc size for non-striped symbols/etc */ |
| 85 | #define P_SIZE (256 * 1024) |
| 86 | #endif |
| 87 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 88 | extern unsigned long physical_memsize; |
| 89 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 90 | #define MAX_VPES 16 |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 91 | #define VPE_PATH_MAX 256 |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 92 | |
| 93 | enum vpe_state { |
| 94 | VPE_STATE_UNUSED = 0, |
| 95 | VPE_STATE_INUSE, |
| 96 | VPE_STATE_RUNNING |
| 97 | }; |
| 98 | |
| 99 | enum tc_state { |
| 100 | TC_STATE_UNUSED = 0, |
| 101 | TC_STATE_INUSE, |
| 102 | TC_STATE_RUNNING, |
| 103 | TC_STATE_DYNAMIC |
| 104 | }; |
| 105 | |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 106 | struct vpe { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 107 | enum vpe_state state; |
| 108 | |
| 109 | /* (device) minor associated with this vpe */ |
| 110 | int minor; |
| 111 | |
| 112 | /* elfloader stuff */ |
| 113 | void *load_addr; |
Ralf Baechle | 571e0be | 2005-12-08 00:32:23 +0000 | [diff] [blame] | 114 | unsigned long len; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 115 | char *pbuffer; |
Ralf Baechle | 571e0be | 2005-12-08 00:32:23 +0000 | [diff] [blame] | 116 | unsigned long plen; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 117 | unsigned int uid, gid; |
| 118 | char cwd[VPE_PATH_MAX]; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 119 | |
| 120 | unsigned long __start; |
| 121 | |
| 122 | /* tc's associated with this vpe */ |
| 123 | struct list_head tc; |
| 124 | |
| 125 | /* The list of vpe's */ |
| 126 | struct list_head list; |
| 127 | |
| 128 | /* shared symbol address */ |
| 129 | void *shared_ptr; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 130 | |
| 131 | /* the list of who wants to know when something major happens */ |
| 132 | struct list_head notify; |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 133 | |
| 134 | unsigned int ntcs; |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 135 | }; |
| 136 | |
| 137 | struct tc { |
| 138 | enum tc_state state; |
| 139 | int index; |
| 140 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 141 | struct vpe *pvpe; /* parent VPE */ |
| 142 | struct list_head tc; /* The list of TC's with this VPE */ |
| 143 | struct list_head list; /* The global list of tc's */ |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 144 | }; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 145 | |
Ralf Baechle | 9cfdf6f | 2007-01-24 19:13:08 +0000 | [diff] [blame] | 146 | struct { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 147 | /* Virtual processing elements */ |
| 148 | struct list_head vpe_list; |
| 149 | |
| 150 | /* Thread contexts */ |
| 151 | struct list_head tc_list; |
Ralf Baechle | 9cfdf6f | 2007-01-24 19:13:08 +0000 | [diff] [blame] | 152 | } vpecontrol = { |
| 153 | .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list), |
| 154 | .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list) |
| 155 | }; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 156 | |
| 157 | static void release_progmem(void *ptr); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 158 | extern void save_gp_address(unsigned int secbase, unsigned int rel); |
| 159 | |
| 160 | /* get the vpe associated with this minor */ |
| 161 | struct vpe *get_vpe(int minor) |
| 162 | { |
| 163 | struct vpe *v; |
| 164 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 165 | if (!cpu_has_mipsmt) |
| 166 | return NULL; |
| 167 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 168 | list_for_each_entry(v, &vpecontrol.vpe_list, list) { |
| 169 | if (v->minor == minor) |
| 170 | return v; |
| 171 | } |
| 172 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | /* get the vpe associated with this minor */ |
| 177 | struct tc *get_tc(int index) |
| 178 | { |
| 179 | struct tc *t; |
| 180 | |
| 181 | list_for_each_entry(t, &vpecontrol.tc_list, list) { |
| 182 | if (t->index == index) |
| 183 | return t; |
| 184 | } |
| 185 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 186 | return NULL; |
| 187 | } |
| 188 | |
| 189 | struct tc *get_tc_unused(void) |
| 190 | { |
| 191 | struct tc *t; |
| 192 | |
| 193 | list_for_each_entry(t, &vpecontrol.tc_list, list) { |
| 194 | if (t->state == TC_STATE_UNUSED) |
| 195 | return t; |
| 196 | } |
| 197 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | /* allocate a vpe and associate it with this minor (or index) */ |
| 202 | struct vpe *alloc_vpe(int minor) |
| 203 | { |
| 204 | struct vpe *v; |
| 205 | |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 206 | if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 207 | return NULL; |
| 208 | } |
| 209 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 210 | INIT_LIST_HEAD(&v->tc); |
| 211 | list_add_tail(&v->list, &vpecontrol.vpe_list); |
| 212 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 213 | INIT_LIST_HEAD(&v->notify); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 214 | v->minor = minor; |
| 215 | return v; |
| 216 | } |
| 217 | |
| 218 | /* allocate a tc. At startup only tc0 is running, all other can be halted. */ |
| 219 | struct tc *alloc_tc(int index) |
| 220 | { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 221 | struct tc *tc; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 222 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 223 | if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) |
| 224 | goto out; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 225 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 226 | INIT_LIST_HEAD(&tc->tc); |
| 227 | tc->index = index; |
| 228 | list_add_tail(&tc->list, &vpecontrol.tc_list); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 229 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 230 | out: |
| 231 | return tc; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | /* clean up and free everything */ |
| 235 | void release_vpe(struct vpe *v) |
| 236 | { |
| 237 | list_del(&v->list); |
| 238 | if (v->load_addr) |
| 239 | release_progmem(v); |
| 240 | kfree(v); |
| 241 | } |
| 242 | |
| 243 | void dump_mtregs(void) |
| 244 | { |
| 245 | unsigned long val; |
| 246 | |
| 247 | val = read_c0_config3(); |
| 248 | printk("config3 0x%lx MT %ld\n", val, |
| 249 | (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT); |
| 250 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 251 | val = read_c0_mvpcontrol(); |
| 252 | printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val, |
| 253 | (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT, |
| 254 | (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT, |
| 255 | (val & MVPCONTROL_EVP)); |
| 256 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 257 | val = read_c0_mvpconf0(); |
| 258 | printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val, |
| 259 | (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT, |
| 260 | val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | /* Find some VPE program space */ |
Ralf Baechle | 571e0be | 2005-12-08 00:32:23 +0000 | [diff] [blame] | 264 | static void *alloc_progmem(unsigned long len) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 265 | { |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 266 | void *addr; |
| 267 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 268 | #ifdef CONFIG_MIPS_VPE_LOADER_TOM |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 269 | /* |
| 270 | * This means you must tell Linux to use less memory than you |
| 271 | * physically have, for example by passing a mem= boot argument. |
| 272 | */ |
Ralf Baechle | 9f2546a | 2008-04-17 13:42:50 +0100 | [diff] [blame] | 273 | addr = pfn_to_kaddr(max_low_pfn); |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 274 | memset(addr, 0, len); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 275 | #else |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 276 | /* simple grab some mem for now */ |
| 277 | addr = kzalloc(len, GFP_KERNEL); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 278 | #endif |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 279 | |
| 280 | return addr; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | static void release_progmem(void *ptr) |
| 284 | { |
| 285 | #ifndef CONFIG_MIPS_VPE_LOADER_TOM |
| 286 | kfree(ptr); |
| 287 | #endif |
| 288 | } |
| 289 | |
| 290 | /* Update size with this section: return offset. */ |
| 291 | static long get_offset(unsigned long *size, Elf_Shdr * sechdr) |
| 292 | { |
| 293 | long ret; |
| 294 | |
| 295 | ret = ALIGN(*size, sechdr->sh_addralign ? : 1); |
| 296 | *size = ret + sechdr->sh_size; |
| 297 | return ret; |
| 298 | } |
| 299 | |
| 300 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
| 301 | might -- code, read-only data, read-write data, small data. Tally |
| 302 | sizes, and place the offsets into sh_entsize fields: high bit means it |
| 303 | belongs in init. */ |
| 304 | static void layout_sections(struct module *mod, const Elf_Ehdr * hdr, |
| 305 | Elf_Shdr * sechdrs, const char *secstrings) |
| 306 | { |
| 307 | static unsigned long const masks[][2] = { |
| 308 | /* NOTE: all executable code must be the first section |
| 309 | * in this array; otherwise modify the text_size |
| 310 | * finder in the two loops below */ |
| 311 | {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, |
| 312 | {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, |
| 313 | {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, |
| 314 | {ARCH_SHF_SMALL | SHF_ALLOC, 0} |
| 315 | }; |
| 316 | unsigned int m, i; |
| 317 | |
| 318 | for (i = 0; i < hdr->e_shnum; i++) |
| 319 | sechdrs[i].sh_entsize = ~0UL; |
| 320 | |
| 321 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 322 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 323 | Elf_Shdr *s = &sechdrs[i]; |
| 324 | |
| 325 | // || strncmp(secstrings + s->sh_name, ".init", 5) == 0) |
| 326 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 327 | || (s->sh_flags & masks[m][1]) |
| 328 | || s->sh_entsize != ~0UL) |
| 329 | continue; |
| 330 | s->sh_entsize = get_offset(&mod->core_size, s); |
| 331 | } |
| 332 | |
| 333 | if (m == 0) |
| 334 | mod->core_text_size = mod->core_size; |
| 335 | |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | |
| 340 | /* from module-elf32.c, but subverted a little */ |
| 341 | |
| 342 | struct mips_hi16 { |
| 343 | struct mips_hi16 *next; |
| 344 | Elf32_Addr *addr; |
| 345 | Elf32_Addr value; |
| 346 | }; |
| 347 | |
| 348 | static struct mips_hi16 *mips_hi16_list; |
| 349 | static unsigned int gp_offs, gp_addr; |
| 350 | |
| 351 | static int apply_r_mips_none(struct module *me, uint32_t *location, |
| 352 | Elf32_Addr v) |
| 353 | { |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static int apply_r_mips_gprel16(struct module *me, uint32_t *location, |
| 358 | Elf32_Addr v) |
| 359 | { |
| 360 | int rel; |
| 361 | |
| 362 | if( !(*location & 0xffff) ) { |
| 363 | rel = (int)v - gp_addr; |
| 364 | } |
| 365 | else { |
| 366 | /* .sbss + gp(relative) + offset */ |
| 367 | /* kludge! */ |
| 368 | rel = (int)(short)((int)v + gp_offs + |
| 369 | (int)(short)(*location & 0xffff) - gp_addr); |
| 370 | } |
| 371 | |
| 372 | if( (rel > 32768) || (rel < -32768) ) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 373 | printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: " |
| 374 | "relative address 0x%x out of range of gp register\n", |
| 375 | rel); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 376 | return -ENOEXEC; |
| 377 | } |
| 378 | |
| 379 | *location = (*location & 0xffff0000) | (rel & 0xffff); |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int apply_r_mips_pc16(struct module *me, uint32_t *location, |
| 385 | Elf32_Addr v) |
| 386 | { |
| 387 | int rel; |
| 388 | rel = (((unsigned int)v - (unsigned int)location)); |
| 389 | rel >>= 2; // because the offset is in _instructions_ not bytes. |
| 390 | rel -= 1; // and one instruction less due to the branch delay slot. |
| 391 | |
| 392 | if( (rel > 32768) || (rel < -32768) ) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 393 | printk(KERN_DEBUG "VPE loader: " |
| 394 | "apply_r_mips_pc16: relative address out of range 0x%x\n", rel); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 395 | return -ENOEXEC; |
| 396 | } |
| 397 | |
| 398 | *location = (*location & 0xffff0000) | (rel & 0xffff); |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | static int apply_r_mips_32(struct module *me, uint32_t *location, |
| 404 | Elf32_Addr v) |
| 405 | { |
| 406 | *location += v; |
| 407 | |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static int apply_r_mips_26(struct module *me, uint32_t *location, |
| 412 | Elf32_Addr v) |
| 413 | { |
| 414 | if (v % 4) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 415 | printk(KERN_DEBUG "VPE loader: apply_r_mips_26 " |
| 416 | " unaligned relocation\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 417 | return -ENOEXEC; |
| 418 | } |
| 419 | |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 420 | /* |
| 421 | * Not desperately convinced this is a good check of an overflow condition |
| 422 | * anyway. But it gets in the way of handling undefined weak symbols which |
| 423 | * we want to set to zero. |
| 424 | * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { |
| 425 | * printk(KERN_ERR |
| 426 | * "module %s: relocation overflow\n", |
| 427 | * me->name); |
| 428 | * return -ENOEXEC; |
| 429 | * } |
| 430 | */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 431 | |
| 432 | *location = (*location & ~0x03ffffff) | |
| 433 | ((*location + (v >> 2)) & 0x03ffffff); |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | static int apply_r_mips_hi16(struct module *me, uint32_t *location, |
| 438 | Elf32_Addr v) |
| 439 | { |
| 440 | struct mips_hi16 *n; |
| 441 | |
| 442 | /* |
| 443 | * We cannot relocate this one now because we don't know the value of |
| 444 | * the carry we need to add. Save the information, and let LO16 do the |
| 445 | * actual relocation. |
| 446 | */ |
| 447 | n = kmalloc(sizeof *n, GFP_KERNEL); |
| 448 | if (!n) |
| 449 | return -ENOMEM; |
| 450 | |
| 451 | n->addr = location; |
| 452 | n->value = v; |
| 453 | n->next = mips_hi16_list; |
| 454 | mips_hi16_list = n; |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static int apply_r_mips_lo16(struct module *me, uint32_t *location, |
| 460 | Elf32_Addr v) |
| 461 | { |
| 462 | unsigned long insnlo = *location; |
| 463 | Elf32_Addr val, vallo; |
| 464 | |
| 465 | /* Sign extend the addend we extract from the lo insn. */ |
| 466 | vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; |
| 467 | |
| 468 | if (mips_hi16_list != NULL) { |
| 469 | struct mips_hi16 *l; |
| 470 | |
| 471 | l = mips_hi16_list; |
| 472 | while (l != NULL) { |
| 473 | struct mips_hi16 *next; |
| 474 | unsigned long insn; |
| 475 | |
| 476 | /* |
| 477 | * The value for the HI16 had best be the same. |
| 478 | */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 479 | if (v != l->value) { |
| 480 | printk(KERN_DEBUG "VPE loader: " |
Joe Perches | b1e3afa | 2007-11-19 17:47:54 -0800 | [diff] [blame] | 481 | "apply_r_mips_lo16/hi16: \t" |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 482 | "inconsistent value information\n"); |
| 483 | return -ENOEXEC; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 484 | } |
| 485 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 486 | /* |
| 487 | * Do the HI16 relocation. Note that we actually don't |
| 488 | * need to know anything about the LO16 itself, except |
| 489 | * where to find the low 16 bits of the addend needed |
| 490 | * by the LO16. |
| 491 | */ |
| 492 | insn = *l->addr; |
| 493 | val = ((insn & 0xffff) << 16) + vallo; |
| 494 | val += v; |
| 495 | |
| 496 | /* |
| 497 | * Account for the sign extension that will happen in |
| 498 | * the low bits. |
| 499 | */ |
| 500 | val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; |
| 501 | |
| 502 | insn = (insn & ~0xffff) | val; |
| 503 | *l->addr = insn; |
| 504 | |
| 505 | next = l->next; |
| 506 | kfree(l); |
| 507 | l = next; |
| 508 | } |
| 509 | |
| 510 | mips_hi16_list = NULL; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Ok, we're done with the HI16 relocs. Now deal with the LO16. |
| 515 | */ |
| 516 | val = v + vallo; |
| 517 | insnlo = (insnlo & ~0xffff) | (val & 0xffff); |
| 518 | *location = insnlo; |
| 519 | |
| 520 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | static int (*reloc_handlers[]) (struct module *me, uint32_t *location, |
| 524 | Elf32_Addr v) = { |
| 525 | [R_MIPS_NONE] = apply_r_mips_none, |
| 526 | [R_MIPS_32] = apply_r_mips_32, |
| 527 | [R_MIPS_26] = apply_r_mips_26, |
| 528 | [R_MIPS_HI16] = apply_r_mips_hi16, |
| 529 | [R_MIPS_LO16] = apply_r_mips_lo16, |
| 530 | [R_MIPS_GPREL16] = apply_r_mips_gprel16, |
| 531 | [R_MIPS_PC16] = apply_r_mips_pc16 |
| 532 | }; |
| 533 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 534 | static char *rstrs[] = { |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 535 | [R_MIPS_NONE] = "MIPS_NONE", |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 536 | [R_MIPS_32] = "MIPS_32", |
| 537 | [R_MIPS_26] = "MIPS_26", |
| 538 | [R_MIPS_HI16] = "MIPS_HI16", |
| 539 | [R_MIPS_LO16] = "MIPS_LO16", |
| 540 | [R_MIPS_GPREL16] = "MIPS_GPREL16", |
| 541 | [R_MIPS_PC16] = "MIPS_PC16" |
| 542 | }; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 543 | |
| 544 | int apply_relocations(Elf32_Shdr *sechdrs, |
| 545 | const char *strtab, |
| 546 | unsigned int symindex, |
| 547 | unsigned int relsec, |
| 548 | struct module *me) |
| 549 | { |
| 550 | Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; |
| 551 | Elf32_Sym *sym; |
| 552 | uint32_t *location; |
| 553 | unsigned int i; |
| 554 | Elf32_Addr v; |
| 555 | int res; |
| 556 | |
| 557 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 558 | Elf32_Word r_info = rel[i].r_info; |
| 559 | |
| 560 | /* This is where to make the change */ |
| 561 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 562 | + rel[i].r_offset; |
| 563 | /* This is the symbol it is referring to */ |
| 564 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
| 565 | + ELF32_R_SYM(r_info); |
| 566 | |
| 567 | if (!sym->st_value) { |
| 568 | printk(KERN_DEBUG "%s: undefined weak symbol %s\n", |
| 569 | me->name, strtab + sym->st_name); |
| 570 | /* just print the warning, dont barf */ |
| 571 | } |
| 572 | |
| 573 | v = sym->st_value; |
| 574 | |
| 575 | res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); |
| 576 | if( res ) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 577 | char *r = rstrs[ELF32_R_TYPE(r_info)]; |
| 578 | printk(KERN_WARNING "VPE loader: .text+0x%x " |
| 579 | "relocation type %s for symbol \"%s\" failed\n", |
| 580 | rel[i].r_offset, r ? r : "UNKNOWN", |
| 581 | strtab + sym->st_name); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 582 | return res; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 583 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | void save_gp_address(unsigned int secbase, unsigned int rel) |
| 590 | { |
| 591 | gp_addr = secbase + rel; |
| 592 | gp_offs = gp_addr - (secbase & 0xffff0000); |
| 593 | } |
| 594 | /* end module-elf32.c */ |
| 595 | |
| 596 | |
| 597 | |
| 598 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 599 | static void simplify_symbols(Elf_Shdr * sechdrs, |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 600 | unsigned int symindex, |
| 601 | const char *strtab, |
| 602 | const char *secstrings, |
| 603 | unsigned int nsecs, struct module *mod) |
| 604 | { |
| 605 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 606 | unsigned long secbase, bssbase = 0; |
| 607 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 608 | int size; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 609 | |
| 610 | /* find the .bss section for COMMON symbols */ |
| 611 | for (i = 0; i < nsecs; i++) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 612 | if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 613 | bssbase = sechdrs[i].sh_addr; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 614 | break; |
| 615 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | for (i = 1; i < n; i++) { |
| 619 | switch (sym[i].st_shndx) { |
| 620 | case SHN_COMMON: |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 621 | /* Allocate space for the symbol in the .bss section. |
| 622 | st_value is currently size. |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 623 | We want it to have the address of the symbol. */ |
| 624 | |
| 625 | size = sym[i].st_value; |
| 626 | sym[i].st_value = bssbase; |
| 627 | |
| 628 | bssbase += size; |
| 629 | break; |
| 630 | |
| 631 | case SHN_ABS: |
| 632 | /* Don't need to do anything */ |
| 633 | break; |
| 634 | |
| 635 | case SHN_UNDEF: |
| 636 | /* ret = -ENOENT; */ |
| 637 | break; |
| 638 | |
| 639 | case SHN_MIPS_SCOMMON: |
Joe Perches | b1e3afa | 2007-11-19 17:47:54 -0800 | [diff] [blame] | 640 | printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON " |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 641 | "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name, |
| 642 | sym[i].st_shndx); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 643 | // .sbss section |
| 644 | break; |
| 645 | |
| 646 | default: |
| 647 | secbase = sechdrs[sym[i].st_shndx].sh_addr; |
| 648 | |
| 649 | if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) { |
| 650 | save_gp_address(secbase, sym[i].st_value); |
| 651 | } |
| 652 | |
| 653 | sym[i].st_value += secbase; |
| 654 | break; |
| 655 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 656 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | #ifdef DEBUG_ELFLOADER |
| 660 | static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex, |
| 661 | const char *strtab, struct module *mod) |
| 662 | { |
| 663 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 664 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 665 | |
| 666 | printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n); |
| 667 | for (i = 1; i < n; i++) { |
| 668 | printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i, |
| 669 | strtab + sym[i].st_name, sym[i].st_value); |
| 670 | } |
| 671 | } |
| 672 | #endif |
| 673 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 674 | /* We are prepared so configure and start the VPE... */ |
Ralf Baechle | be6e143 | 2007-02-06 16:53:17 +0000 | [diff] [blame] | 675 | static int vpe_run(struct vpe * v) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 676 | { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 677 | unsigned long flags, val, dmt_flag; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 678 | struct vpe_notifications *n; |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 679 | unsigned int vpeflags; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 680 | struct tc *t; |
| 681 | |
| 682 | /* check we are the Master VPE */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 683 | local_irq_save(flags); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 684 | val = read_c0_vpeconf0(); |
| 685 | if (!(val & VPECONF0_MVP)) { |
| 686 | printk(KERN_WARNING |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 687 | "VPE loader: only Master VPE's are allowed to configure MT\n"); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 688 | local_irq_restore(flags); |
| 689 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 690 | return -1; |
| 691 | } |
| 692 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 693 | dmt_flag = dmt(); |
| 694 | vpeflags = dvpe(); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 695 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 696 | if (!list_empty(&v->tc)) { |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 697 | if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 698 | evpe(vpeflags); |
| 699 | emt(dmt_flag); |
| 700 | local_irq_restore(flags); |
| 701 | |
| 702 | printk(KERN_WARNING |
| 703 | "VPE loader: TC %d is already in use.\n", |
| 704 | t->index); |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 705 | return -ENOEXEC; |
| 706 | } |
| 707 | } else { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 708 | evpe(vpeflags); |
| 709 | emt(dmt_flag); |
| 710 | local_irq_restore(flags); |
| 711 | |
| 712 | printk(KERN_WARNING |
| 713 | "VPE loader: No TC's associated with VPE %d\n", |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 714 | v->minor); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 715 | |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 716 | return -ENOEXEC; |
| 717 | } |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 718 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 719 | /* Put MVPE's into 'configuration state' */ |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 720 | set_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 721 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 722 | settc(t->index); |
| 723 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 724 | /* should check it is halted, and not activated */ |
| 725 | if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 726 | evpe(vpeflags); |
| 727 | emt(dmt_flag); |
| 728 | local_irq_restore(flags); |
| 729 | |
| 730 | printk(KERN_WARNING "VPE loader: TC %d is already active!\n", |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 731 | t->index); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 732 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 733 | return -ENOEXEC; |
| 734 | } |
| 735 | |
| 736 | /* Write the address we want it to start running from in the TCPC register. */ |
| 737 | write_tc_c0_tcrestart((unsigned long)v->__start); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 738 | write_tc_c0_tccontext((unsigned long)0); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 739 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 740 | /* |
| 741 | * Mark the TC as activated, not interrupt exempt and not dynamically |
| 742 | * allocatable |
| 743 | */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 744 | val = read_tc_c0_tcstatus(); |
| 745 | val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A; |
| 746 | write_tc_c0_tcstatus(val); |
| 747 | |
| 748 | write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H); |
| 749 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 750 | /* |
| 751 | * The sde-kit passes 'memsize' to __start in $a3, so set something |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 752 | * here... Or set $a3 to zero and define DFLT_STACK_SIZE and |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 753 | * DFLT_HEAP_SIZE when you compile your program |
| 754 | */ |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 755 | mttgpr(6, v->ntcs); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 756 | mttgpr(7, physical_memsize); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 757 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 758 | /* set up VPE1 */ |
| 759 | /* |
| 760 | * bind the TC to VPE 1 as late as possible so we only have the final |
| 761 | * VPE registers to set up, and so an EJTAG probe can trigger on it |
| 762 | */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 763 | write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 764 | |
Elizabeth Oldham | a94d702 | 2006-08-17 12:39:21 +0100 | [diff] [blame] | 765 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA)); |
| 766 | |
| 767 | back_to_back_c0_hazard(); |
| 768 | |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 769 | /* Set up the XTC bit in vpeconf0 to point at our tc */ |
| 770 | write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC)) |
| 771 | | (t->index << VPECONF0_XTC_SHIFT)); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 772 | |
Elizabeth Oldham | a94d702 | 2006-08-17 12:39:21 +0100 | [diff] [blame] | 773 | back_to_back_c0_hazard(); |
| 774 | |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 775 | /* enable this VPE */ |
| 776 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 777 | |
| 778 | /* clear out any left overs from a previous program */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 779 | write_vpe_c0_status(0); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 780 | write_vpe_c0_cause(0); |
| 781 | |
| 782 | /* take system out of configuration state */ |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 783 | clear_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 784 | |
Kevin D. Kissell | b618336 | 2008-04-16 15:32:22 +0200 | [diff] [blame] | 785 | /* |
| 786 | * SMTC/SMVP kernels manage VPE enable independently, |
| 787 | * but uniprocessor kernels need to turn it on, even |
| 788 | * if that wasn't the pre-dvpe() state. |
| 789 | */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 790 | #ifdef CONFIG_SMP |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 791 | evpe(vpeflags); |
Kevin D. Kissell | b618336 | 2008-04-16 15:32:22 +0200 | [diff] [blame] | 792 | #else |
| 793 | evpe(EVPE_ENABLE); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 794 | #endif |
| 795 | emt(dmt_flag); |
| 796 | local_irq_restore(flags); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 797 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 798 | list_for_each_entry(n, &v->notify, list) |
| 799 | n->start(minor); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 800 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 801 | return 0; |
| 802 | } |
| 803 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 804 | static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs, |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 805 | unsigned int symindex, const char *strtab, |
| 806 | struct module *mod) |
| 807 | { |
| 808 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 809 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 810 | |
| 811 | for (i = 1; i < n; i++) { |
| 812 | if (strcmp(strtab + sym[i].st_name, "__start") == 0) { |
| 813 | v->__start = sym[i].st_value; |
| 814 | } |
| 815 | |
| 816 | if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) { |
| 817 | v->shared_ptr = (void *)sym[i].st_value; |
| 818 | } |
| 819 | } |
| 820 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 821 | if ( (v->__start == 0) || (v->shared_ptr == NULL)) |
| 822 | return -1; |
| 823 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 824 | return 0; |
| 825 | } |
| 826 | |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 827 | /* |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 828 | * Allocates a VPE with some program code space(the load address), copies the |
| 829 | * contents of the program (p)buffer performing relocatations/etc, free's it |
| 830 | * when finished. |
| 831 | */ |
Ralf Baechle | be6e143 | 2007-02-06 16:53:17 +0000 | [diff] [blame] | 832 | static int vpe_elfload(struct vpe * v) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 833 | { |
| 834 | Elf_Ehdr *hdr; |
| 835 | Elf_Shdr *sechdrs; |
| 836 | long err = 0; |
| 837 | char *secstrings, *strtab = NULL; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 838 | unsigned int len, i, symindex = 0, strindex = 0, relocate = 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 839 | struct module mod; // so we can re-use the relocations code |
| 840 | |
| 841 | memset(&mod, 0, sizeof(struct module)); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 842 | strcpy(mod.name, "VPE loader"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 843 | |
| 844 | hdr = (Elf_Ehdr *) v->pbuffer; |
| 845 | len = v->plen; |
| 846 | |
| 847 | /* Sanity checks against insmoding binaries or wrong arch, |
| 848 | weird elf version */ |
Cyrill Gorcunov | d303f4a | 2008-05-04 17:50:02 +0100 | [diff] [blame] | 849 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 850 | || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC) |
| 851 | || !elf_check_arch(hdr) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 852 | || hdr->e_shentsize != sizeof(*sechdrs)) { |
| 853 | printk(KERN_WARNING |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 854 | "VPE loader: program wrong arch or weird elf version\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 855 | |
| 856 | return -ENOEXEC; |
| 857 | } |
| 858 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 859 | if (hdr->e_type == ET_REL) |
| 860 | relocate = 1; |
| 861 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 862 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 863 | printk(KERN_ERR "VPE loader: program length %u truncated\n", |
| 864 | len); |
| 865 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 866 | return -ENOEXEC; |
| 867 | } |
| 868 | |
| 869 | /* Convenience variables */ |
| 870 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 871 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 872 | sechdrs[0].sh_addr = 0; |
| 873 | |
| 874 | /* And these should exist, but gcc whinges if we don't init them */ |
| 875 | symindex = strindex = 0; |
| 876 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 877 | if (relocate) { |
| 878 | for (i = 1; i < hdr->e_shnum; i++) { |
| 879 | if (sechdrs[i].sh_type != SHT_NOBITS |
| 880 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) { |
| 881 | printk(KERN_ERR "VPE program length %u truncated\n", |
| 882 | len); |
| 883 | return -ENOEXEC; |
| 884 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 885 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 886 | /* Mark all sections sh_addr with their address in the |
| 887 | temporary image. */ |
| 888 | sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; |
| 889 | |
| 890 | /* Internal symbols and strings. */ |
| 891 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 892 | symindex = i; |
| 893 | strindex = sechdrs[i].sh_link; |
| 894 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
| 895 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 896 | } |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 897 | layout_sections(&mod, hdr, sechdrs, secstrings); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 898 | } |
| 899 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 900 | v->load_addr = alloc_progmem(mod.core_size); |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 901 | if (!v->load_addr) |
| 902 | return -ENOMEM; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 903 | |
Ralf Baechle | 5408c49 | 2008-03-13 15:16:53 +0000 | [diff] [blame] | 904 | pr_info("VPE loader: loading to %p\n", v->load_addr); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 905 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 906 | if (relocate) { |
| 907 | for (i = 0; i < hdr->e_shnum; i++) { |
| 908 | void *dest; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 909 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 910 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 911 | continue; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 912 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 913 | dest = v->load_addr + sechdrs[i].sh_entsize; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 914 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 915 | if (sechdrs[i].sh_type != SHT_NOBITS) |
| 916 | memcpy(dest, (void *)sechdrs[i].sh_addr, |
| 917 | sechdrs[i].sh_size); |
| 918 | /* Update sh_addr to point to copy in image. */ |
| 919 | sechdrs[i].sh_addr = (unsigned long)dest; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 920 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 921 | printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n", |
| 922 | secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr); |
| 923 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 924 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 925 | /* Fix up syms, so that st_value is a pointer to location. */ |
| 926 | simplify_symbols(sechdrs, symindex, strtab, secstrings, |
| 927 | hdr->e_shnum, &mod); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 928 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 929 | /* Now do relocations. */ |
| 930 | for (i = 1; i < hdr->e_shnum; i++) { |
| 931 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 932 | unsigned int info = sechdrs[i].sh_info; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 933 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 934 | /* Not a valid relocation section? */ |
| 935 | if (info >= hdr->e_shnum) |
| 936 | continue; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 937 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 938 | /* Don't bother with non-allocated sections */ |
| 939 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) |
| 940 | continue; |
| 941 | |
| 942 | if (sechdrs[i].sh_type == SHT_REL) |
| 943 | err = apply_relocations(sechdrs, strtab, symindex, i, |
| 944 | &mod); |
| 945 | else if (sechdrs[i].sh_type == SHT_RELA) |
| 946 | err = apply_relocate_add(sechdrs, strtab, symindex, i, |
| 947 | &mod); |
| 948 | if (err < 0) |
| 949 | return err; |
| 950 | |
| 951 | } |
| 952 | } else { |
Ralf Baechle | bdf5d42 | 2007-10-10 13:33:03 +0100 | [diff] [blame] | 953 | struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 954 | |
Ralf Baechle | bdf5d42 | 2007-10-10 13:33:03 +0100 | [diff] [blame] | 955 | for (i = 0; i < hdr->e_phnum; i++) { |
Kevin D. Kissell | b618336 | 2008-04-16 15:32:22 +0200 | [diff] [blame] | 956 | if (phdr->p_type == PT_LOAD) { |
| 957 | memcpy((void *)phdr->p_paddr, |
| 958 | (char *)hdr + phdr->p_offset, |
| 959 | phdr->p_filesz); |
| 960 | memset((void *)phdr->p_paddr + phdr->p_filesz, |
| 961 | 0, phdr->p_memsz - phdr->p_filesz); |
| 962 | } |
| 963 | phdr++; |
Ralf Baechle | bdf5d42 | 2007-10-10 13:33:03 +0100 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | for (i = 0; i < hdr->e_shnum; i++) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 967 | /* Internal symbols and strings. */ |
| 968 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 969 | symindex = i; |
| 970 | strindex = sechdrs[i].sh_link; |
| 971 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
| 972 | |
| 973 | /* mark the symtab's address for when we try to find the |
| 974 | magic symbols */ |
| 975 | sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; |
| 976 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 977 | } |
| 978 | } |
| 979 | |
| 980 | /* make sure it's physically written out */ |
| 981 | flush_icache_range((unsigned long)v->load_addr, |
| 982 | (unsigned long)v->load_addr + v->len); |
| 983 | |
| 984 | if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 985 | if (v->__start == 0) { |
| 986 | printk(KERN_WARNING "VPE loader: program does not contain " |
| 987 | "a __start symbol\n"); |
| 988 | return -ENOEXEC; |
| 989 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 990 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 991 | if (v->shared_ptr == NULL) |
| 992 | printk(KERN_WARNING "VPE loader: " |
| 993 | "program does not contain vpe_shared symbol.\n" |
| 994 | " Unable to use AMVP (AP/SP) facilities.\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | printk(" elf loaded\n"); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 998 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 999 | } |
| 1000 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1001 | static void cleanup_tc(struct tc *tc) |
| 1002 | { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1003 | unsigned long flags; |
| 1004 | unsigned int mtflags, vpflags; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1005 | int tmp; |
| 1006 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1007 | local_irq_save(flags); |
| 1008 | mtflags = dmt(); |
| 1009 | vpflags = dvpe(); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1010 | /* Put MVPE's into 'configuration state' */ |
| 1011 | set_c0_mvpcontrol(MVPCONTROL_VPC); |
| 1012 | |
| 1013 | settc(tc->index); |
| 1014 | tmp = read_tc_c0_tcstatus(); |
| 1015 | |
| 1016 | /* mark not allocated and not dynamically allocatable */ |
| 1017 | tmp &= ~(TCSTATUS_A | TCSTATUS_DA); |
| 1018 | tmp |= TCSTATUS_IXMT; /* interrupt exempt */ |
| 1019 | write_tc_c0_tcstatus(tmp); |
| 1020 | |
| 1021 | write_tc_c0_tchalt(TCHALT_H); |
Nigel Stephens | 7c3a622 | 2007-11-08 13:25:51 +0000 | [diff] [blame] | 1022 | mips_ihb(); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1023 | |
| 1024 | /* bind it to anything other than VPE1 */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1025 | // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1026 | |
| 1027 | clear_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1028 | evpe(vpflags); |
| 1029 | emt(mtflags); |
| 1030 | local_irq_restore(flags); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1031 | } |
| 1032 | |
| 1033 | static int getcwd(char *buff, int size) |
| 1034 | { |
| 1035 | mm_segment_t old_fs; |
| 1036 | int ret; |
| 1037 | |
| 1038 | old_fs = get_fs(); |
| 1039 | set_fs(KERNEL_DS); |
| 1040 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 1041 | ret = sys_getcwd(buff, size); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1042 | |
| 1043 | set_fs(old_fs); |
| 1044 | |
| 1045 | return ret; |
| 1046 | } |
| 1047 | |
| 1048 | /* checks VPE is unused and gets ready to load program */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1049 | static int vpe_open(struct inode *inode, struct file *filp) |
| 1050 | { |
Ralf Baechle | c4c4018 | 2007-02-23 13:40:45 +0000 | [diff] [blame] | 1051 | enum vpe_state state; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1052 | struct vpe_notifications *not; |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1053 | struct vpe *v; |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 1054 | int ret, err = 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1055 | |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 1056 | lock_kernel(); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1057 | if (minor != iminor(inode)) { |
| 1058 | /* assume only 1 device at the moment. */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1059 | printk(KERN_WARNING "VPE loader: only vpe1 is supported\n"); |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 1060 | err = -ENODEV; |
| 1061 | goto out; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1062 | } |
| 1063 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1064 | if ((v = get_vpe(tclimit)) == NULL) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1065 | printk(KERN_WARNING "VPE loader: unable to get vpe\n"); |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 1066 | err = -ENODEV; |
| 1067 | goto out; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1068 | } |
| 1069 | |
Ralf Baechle | c4c4018 | 2007-02-23 13:40:45 +0000 | [diff] [blame] | 1070 | state = xchg(&v->state, VPE_STATE_INUSE); |
| 1071 | if (state != VPE_STATE_UNUSED) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1072 | printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n"); |
| 1073 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1074 | list_for_each_entry(not, &v->notify, list) { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1075 | not->stop(tclimit); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1076 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1077 | |
| 1078 | release_progmem(v->load_addr); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1079 | cleanup_tc(get_tc(tclimit)); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1080 | } |
| 1081 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1082 | /* this of-course trashes what was there before... */ |
| 1083 | v->pbuffer = vmalloc(P_SIZE); |
| 1084 | v->plen = P_SIZE; |
| 1085 | v->load_addr = NULL; |
| 1086 | v->len = 0; |
| 1087 | |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 1088 | v->uid = filp->f_cred->fsuid; |
| 1089 | v->gid = filp->f_cred->fsgid; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1090 | |
| 1091 | #ifdef CONFIG_MIPS_APSP_KSPD |
| 1092 | /* get kspd to tell us when a syscall_exit happens */ |
| 1093 | if (!kspd_events_reqd) { |
| 1094 | kspd_notify(&kspd_events); |
| 1095 | kspd_events_reqd++; |
| 1096 | } |
| 1097 | #endif |
| 1098 | |
| 1099 | v->cwd[0] = 0; |
| 1100 | ret = getcwd(v->cwd, VPE_PATH_MAX); |
| 1101 | if (ret < 0) |
| 1102 | printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret); |
| 1103 | |
| 1104 | v->shared_ptr = NULL; |
| 1105 | v->__start = 0; |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1106 | |
Jonathan Corbet | 7558da9 | 2008-05-15 09:10:50 -0600 | [diff] [blame] | 1107 | out: |
| 1108 | unlock_kernel(); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1109 | return 0; |
| 1110 | } |
| 1111 | |
| 1112 | static int vpe_release(struct inode *inode, struct file *filp) |
| 1113 | { |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 1114 | struct vpe *v; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1115 | Elf_Ehdr *hdr; |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1116 | int ret = 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1117 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1118 | v = get_vpe(tclimit); |
| 1119 | if (v == NULL) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1120 | return -ENODEV; |
| 1121 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1122 | hdr = (Elf_Ehdr *) v->pbuffer; |
Cyrill Gorcunov | d303f4a | 2008-05-04 17:50:02 +0100 | [diff] [blame] | 1123 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1124 | if (vpe_elfload(v) >= 0) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1125 | vpe_run(v); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1126 | } else { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1127 | printk(KERN_WARNING "VPE loader: ELF load failed.\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1128 | ret = -ENOEXEC; |
| 1129 | } |
| 1130 | } else { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1131 | printk(KERN_WARNING "VPE loader: only elf files are supported\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1132 | ret = -ENOEXEC; |
| 1133 | } |
| 1134 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1135 | /* It's good to be able to run the SP and if it chokes have a look at |
| 1136 | the /dev/rt?. But if we reset the pointer to the shared struct we |
Nick Andrew | 8ebcfc8 | 2008-12-05 11:36:54 +1100 | [diff] [blame] | 1137 | lose what has happened. So perhaps if garbage is sent to the vpe |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1138 | device, use it as a trigger for the reset. Hopefully a nice |
| 1139 | executable will be along shortly. */ |
| 1140 | if (ret < 0) |
| 1141 | v->shared_ptr = NULL; |
| 1142 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1143 | // cleanup any temp buffers |
| 1144 | if (v->pbuffer) |
| 1145 | vfree(v->pbuffer); |
| 1146 | v->plen = 0; |
| 1147 | return ret; |
| 1148 | } |
| 1149 | |
| 1150 | static ssize_t vpe_write(struct file *file, const char __user * buffer, |
| 1151 | size_t count, loff_t * ppos) |
| 1152 | { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1153 | size_t ret = count; |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 1154 | struct vpe *v; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1155 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1156 | if (iminor(file->f_path.dentry->d_inode) != minor) |
| 1157 | return -ENODEV; |
| 1158 | |
| 1159 | v = get_vpe(tclimit); |
| 1160 | if (v == NULL) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1161 | return -ENODEV; |
| 1162 | |
| 1163 | if (v->pbuffer == NULL) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1164 | printk(KERN_ERR "VPE loader: no buffer for program\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1165 | return -ENOMEM; |
| 1166 | } |
| 1167 | |
| 1168 | if ((count + v->len) > v->plen) { |
| 1169 | printk(KERN_WARNING |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1170 | "VPE loader: elf size too big. Perhaps strip uneeded symbols\n"); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1171 | return -ENOMEM; |
| 1172 | } |
| 1173 | |
| 1174 | count -= copy_from_user(v->pbuffer + v->len, buffer, count); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1175 | if (!count) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1176 | return -EFAULT; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1177 | |
| 1178 | v->len += count; |
| 1179 | return ret; |
| 1180 | } |
| 1181 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 1182 | static const struct file_operations vpe_fops = { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1183 | .owner = THIS_MODULE, |
| 1184 | .open = vpe_open, |
| 1185 | .release = vpe_release, |
| 1186 | .write = vpe_write |
| 1187 | }; |
| 1188 | |
| 1189 | /* module wrapper entry points */ |
| 1190 | /* give me a vpe */ |
| 1191 | vpe_handle vpe_alloc(void) |
| 1192 | { |
| 1193 | int i; |
| 1194 | struct vpe *v; |
| 1195 | |
| 1196 | /* find a vpe */ |
| 1197 | for (i = 1; i < MAX_VPES; i++) { |
| 1198 | if ((v = get_vpe(i)) != NULL) { |
| 1199 | v->state = VPE_STATE_INUSE; |
| 1200 | return v; |
| 1201 | } |
| 1202 | } |
| 1203 | return NULL; |
| 1204 | } |
| 1205 | |
| 1206 | EXPORT_SYMBOL(vpe_alloc); |
| 1207 | |
| 1208 | /* start running from here */ |
| 1209 | int vpe_start(vpe_handle vpe, unsigned long start) |
| 1210 | { |
| 1211 | struct vpe *v = vpe; |
| 1212 | |
| 1213 | v->__start = start; |
| 1214 | return vpe_run(v); |
| 1215 | } |
| 1216 | |
| 1217 | EXPORT_SYMBOL(vpe_start); |
| 1218 | |
| 1219 | /* halt it for now */ |
| 1220 | int vpe_stop(vpe_handle vpe) |
| 1221 | { |
| 1222 | struct vpe *v = vpe; |
| 1223 | struct tc *t; |
| 1224 | unsigned int evpe_flags; |
| 1225 | |
| 1226 | evpe_flags = dvpe(); |
| 1227 | |
| 1228 | if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) { |
| 1229 | |
| 1230 | settc(t->index); |
| 1231 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); |
| 1232 | } |
| 1233 | |
| 1234 | evpe(evpe_flags); |
| 1235 | |
| 1236 | return 0; |
| 1237 | } |
| 1238 | |
| 1239 | EXPORT_SYMBOL(vpe_stop); |
| 1240 | |
| 1241 | /* I've done with it thank you */ |
| 1242 | int vpe_free(vpe_handle vpe) |
| 1243 | { |
| 1244 | struct vpe *v = vpe; |
| 1245 | struct tc *t; |
| 1246 | unsigned int evpe_flags; |
| 1247 | |
| 1248 | if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { |
| 1249 | return -ENOEXEC; |
| 1250 | } |
| 1251 | |
| 1252 | evpe_flags = dvpe(); |
| 1253 | |
| 1254 | /* Put MVPE's into 'configuration state' */ |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 1255 | set_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1256 | |
| 1257 | settc(t->index); |
| 1258 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); |
| 1259 | |
Nigel Stephens | 7c3a622 | 2007-11-08 13:25:51 +0000 | [diff] [blame] | 1260 | /* halt the TC */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1261 | write_tc_c0_tchalt(TCHALT_H); |
Nigel Stephens | 7c3a622 | 2007-11-08 13:25:51 +0000 | [diff] [blame] | 1262 | mips_ihb(); |
| 1263 | |
| 1264 | /* mark the TC unallocated */ |
| 1265 | write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1266 | |
| 1267 | v->state = VPE_STATE_UNUSED; |
| 1268 | |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 1269 | clear_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1270 | evpe(evpe_flags); |
| 1271 | |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | EXPORT_SYMBOL(vpe_free); |
| 1276 | |
| 1277 | void *vpe_get_shared(int index) |
| 1278 | { |
| 1279 | struct vpe *v; |
| 1280 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1281 | if ((v = get_vpe(index)) == NULL) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1282 | return NULL; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1283 | |
| 1284 | return v->shared_ptr; |
| 1285 | } |
| 1286 | |
| 1287 | EXPORT_SYMBOL(vpe_get_shared); |
| 1288 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1289 | int vpe_getuid(int index) |
| 1290 | { |
| 1291 | struct vpe *v; |
| 1292 | |
| 1293 | if ((v = get_vpe(index)) == NULL) |
| 1294 | return -1; |
| 1295 | |
| 1296 | return v->uid; |
| 1297 | } |
| 1298 | |
| 1299 | EXPORT_SYMBOL(vpe_getuid); |
| 1300 | |
| 1301 | int vpe_getgid(int index) |
| 1302 | { |
| 1303 | struct vpe *v; |
| 1304 | |
| 1305 | if ((v = get_vpe(index)) == NULL) |
| 1306 | return -1; |
| 1307 | |
| 1308 | return v->gid; |
| 1309 | } |
| 1310 | |
| 1311 | EXPORT_SYMBOL(vpe_getgid); |
| 1312 | |
| 1313 | int vpe_notify(int index, struct vpe_notifications *notify) |
| 1314 | { |
| 1315 | struct vpe *v; |
| 1316 | |
| 1317 | if ((v = get_vpe(index)) == NULL) |
| 1318 | return -1; |
| 1319 | |
| 1320 | list_add(¬ify->list, &v->notify); |
| 1321 | return 0; |
| 1322 | } |
| 1323 | |
| 1324 | EXPORT_SYMBOL(vpe_notify); |
| 1325 | |
| 1326 | char *vpe_getcwd(int index) |
| 1327 | { |
| 1328 | struct vpe *v; |
| 1329 | |
| 1330 | if ((v = get_vpe(index)) == NULL) |
| 1331 | return NULL; |
| 1332 | |
| 1333 | return v->cwd; |
| 1334 | } |
| 1335 | |
| 1336 | EXPORT_SYMBOL(vpe_getcwd); |
| 1337 | |
| 1338 | #ifdef CONFIG_MIPS_APSP_KSPD |
| 1339 | static void kspd_sp_exit( int sp_id) |
| 1340 | { |
| 1341 | cleanup_tc(get_tc(sp_id)); |
| 1342 | } |
| 1343 | #endif |
| 1344 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1345 | static ssize_t store_kill(struct device *dev, struct device_attribute *attr, |
| 1346 | const char *buf, size_t len) |
Ralf Baechle | 0f5d0df | 2007-07-27 19:37:51 +0100 | [diff] [blame] | 1347 | { |
| 1348 | struct vpe *vpe = get_vpe(tclimit); |
| 1349 | struct vpe_notifications *not; |
| 1350 | |
| 1351 | list_for_each_entry(not, &vpe->notify, list) { |
| 1352 | not->stop(tclimit); |
| 1353 | } |
| 1354 | |
| 1355 | release_progmem(vpe->load_addr); |
| 1356 | cleanup_tc(get_tc(tclimit)); |
| 1357 | vpe_stop(vpe); |
| 1358 | vpe_free(vpe); |
| 1359 | |
| 1360 | return len; |
| 1361 | } |
| 1362 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1363 | static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr, |
| 1364 | char *buf) |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1365 | { |
| 1366 | struct vpe *vpe = get_vpe(tclimit); |
| 1367 | |
| 1368 | return sprintf(buf, "%d\n", vpe->ntcs); |
| 1369 | } |
| 1370 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1371 | static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr, |
| 1372 | const char *buf, size_t len) |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1373 | { |
| 1374 | struct vpe *vpe = get_vpe(tclimit); |
| 1375 | unsigned long new; |
| 1376 | char *endp; |
| 1377 | |
| 1378 | new = simple_strtoul(buf, &endp, 0); |
| 1379 | if (endp == buf) |
| 1380 | goto out_einval; |
| 1381 | |
| 1382 | if (new == 0 || new > (hw_tcs - tclimit)) |
| 1383 | goto out_einval; |
| 1384 | |
| 1385 | vpe->ntcs = new; |
| 1386 | |
| 1387 | return len; |
| 1388 | |
| 1389 | out_einval: |
| 1390 | return -EINVAL;; |
| 1391 | } |
| 1392 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1393 | static struct device_attribute vpe_class_attributes[] = { |
Ralf Baechle | 0f5d0df | 2007-07-27 19:37:51 +0100 | [diff] [blame] | 1394 | __ATTR(kill, S_IWUSR, NULL, store_kill), |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1395 | __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs), |
| 1396 | {} |
| 1397 | }; |
| 1398 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1399 | static void vpe_device_release(struct device *cd) |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1400 | { |
| 1401 | kfree(cd); |
| 1402 | } |
| 1403 | |
| 1404 | struct class vpe_class = { |
| 1405 | .name = "vpe", |
| 1406 | .owner = THIS_MODULE, |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1407 | .dev_release = vpe_device_release, |
| 1408 | .dev_attrs = vpe_class_attributes, |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1409 | }; |
| 1410 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1411 | struct device vpe_device; |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1412 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1413 | static int __init vpe_module_init(void) |
| 1414 | { |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1415 | unsigned int mtflags, vpflags; |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1416 | unsigned long flags, val; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1417 | struct vpe *v = NULL; |
| 1418 | struct tc *t; |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1419 | int tc, err; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1420 | |
| 1421 | if (!cpu_has_mipsmt) { |
| 1422 | printk("VPE loader: not a MIPS MT capable processor\n"); |
| 1423 | return -ENODEV; |
| 1424 | } |
| 1425 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1426 | if (vpelimit == 0) { |
| 1427 | printk(KERN_WARNING "No VPEs reserved for AP/SP, not " |
| 1428 | "initializing VPE loader.\nPass maxvpes=<n> argument as " |
| 1429 | "kernel argument\n"); |
| 1430 | |
| 1431 | return -ENODEV; |
| 1432 | } |
| 1433 | |
| 1434 | if (tclimit == 0) { |
| 1435 | printk(KERN_WARNING "No TCs reserved for AP/SP, not " |
| 1436 | "initializing VPE loader.\nPass maxtcs=<n> argument as " |
| 1437 | "kernel argument\n"); |
| 1438 | |
| 1439 | return -ENODEV; |
| 1440 | } |
| 1441 | |
Alexey Dobriyan | 682e852 | 2006-01-10 00:09:16 +0300 | [diff] [blame] | 1442 | major = register_chrdev(0, module_name, &vpe_fops); |
| 1443 | if (major < 0) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1444 | printk("VPE loader: unable to register character device\n"); |
Ralf Baechle | 307bd28 | 2005-10-31 23:34:52 +0000 | [diff] [blame] | 1445 | return major; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1446 | } |
| 1447 | |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1448 | err = class_register(&vpe_class); |
| 1449 | if (err) { |
| 1450 | printk(KERN_ERR "vpe_class registration failed\n"); |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1451 | goto out_chrdev; |
| 1452 | } |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1453 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1454 | device_initialize(&vpe_device); |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1455 | vpe_device.class = &vpe_class, |
| 1456 | vpe_device.parent = NULL, |
Kay Sievers | 1bb5beb | 2009-01-06 10:44:38 -0800 | [diff] [blame] | 1457 | dev_set_name(&vpe_device, "vpe1"); |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1458 | vpe_device.devt = MKDEV(major, minor); |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1459 | err = device_add(&vpe_device); |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1460 | if (err) { |
| 1461 | printk(KERN_ERR "Adding vpe_device failed\n"); |
| 1462 | goto out_class; |
| 1463 | } |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1464 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1465 | local_irq_save(flags); |
| 1466 | mtflags = dmt(); |
| 1467 | vpflags = dvpe(); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1468 | |
| 1469 | /* Put MVPE's into 'configuration state' */ |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 1470 | set_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1471 | |
| 1472 | /* dump_mtregs(); */ |
| 1473 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1474 | val = read_c0_mvpconf0(); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1475 | hw_tcs = (val & MVPCONF0_PTC) + 1; |
| 1476 | hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; |
| 1477 | |
| 1478 | for (tc = tclimit; tc < hw_tcs; tc++) { |
| 1479 | /* |
| 1480 | * Must re-enable multithreading temporarily or in case we |
| 1481 | * reschedule send IPIs or similar we might hang. |
| 1482 | */ |
| 1483 | clear_c0_mvpcontrol(MVPCONTROL_VPC); |
| 1484 | evpe(vpflags); |
| 1485 | emt(mtflags); |
| 1486 | local_irq_restore(flags); |
| 1487 | t = alloc_tc(tc); |
| 1488 | if (!t) { |
| 1489 | err = -ENOMEM; |
| 1490 | goto out; |
| 1491 | } |
| 1492 | |
| 1493 | local_irq_save(flags); |
| 1494 | mtflags = dmt(); |
| 1495 | vpflags = dvpe(); |
| 1496 | set_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1497 | |
| 1498 | /* VPE's */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1499 | if (tc < hw_tcs) { |
| 1500 | settc(tc); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1501 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1502 | if ((v = alloc_vpe(tc)) == NULL) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1503 | printk(KERN_WARNING "VPE: unable to allocate VPE\n"); |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1504 | |
| 1505 | goto out_reenable; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1506 | } |
| 1507 | |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1508 | v->ntcs = hw_tcs - tclimit; |
| 1509 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1510 | /* add the tc to the list of this vpe's tc's. */ |
| 1511 | list_add(&t->tc, &v->tc); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1512 | |
| 1513 | /* deactivate all but vpe0 */ |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1514 | if (tc >= tclimit) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1515 | unsigned long tmp = read_vpe_c0_vpeconf0(); |
| 1516 | |
| 1517 | tmp &= ~VPECONF0_VPA; |
| 1518 | |
| 1519 | /* master VPE */ |
| 1520 | tmp |= VPECONF0_MVP; |
| 1521 | write_vpe_c0_vpeconf0(tmp); |
| 1522 | } |
| 1523 | |
| 1524 | /* disable multi-threading with TC's */ |
| 1525 | write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); |
| 1526 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1527 | if (tc >= vpelimit) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1528 | /* |
| 1529 | * Set config to be the same as vpe0, |
| 1530 | * particularly kseg0 coherency alg |
| 1531 | */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1532 | write_vpe_c0_config(read_c0_config()); |
| 1533 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1534 | } |
| 1535 | |
| 1536 | /* TC's */ |
| 1537 | t->pvpe = v; /* set the parent vpe */ |
| 1538 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1539 | if (tc >= tclimit) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1540 | unsigned long tmp; |
| 1541 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1542 | settc(tc); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1543 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1544 | /* Any TC that is bound to VPE0 gets left as is - in case |
| 1545 | we are running SMTC on VPE0. A TC that is bound to any |
| 1546 | other VPE gets bound to VPE0, ideally I'd like to make |
| 1547 | it homeless but it doesn't appear to let me bind a TC |
| 1548 | to a non-existent VPE. Which is perfectly reasonable. |
| 1549 | |
| 1550 | The (un)bound state is visible to an EJTAG probe so may |
| 1551 | notify GDB... |
| 1552 | */ |
| 1553 | |
| 1554 | if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) { |
| 1555 | /* tc is bound >vpe0 */ |
| 1556 | write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE); |
| 1557 | |
| 1558 | t->pvpe = get_vpe(0); /* set the parent vpe */ |
| 1559 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1560 | |
Nigel Stephens | 7c3a622 | 2007-11-08 13:25:51 +0000 | [diff] [blame] | 1561 | /* halt the TC */ |
| 1562 | write_tc_c0_tchalt(TCHALT_H); |
| 1563 | mips_ihb(); |
| 1564 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1565 | tmp = read_tc_c0_tcstatus(); |
| 1566 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1567 | /* mark not activated and not dynamically allocatable */ |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1568 | tmp &= ~(TCSTATUS_A | TCSTATUS_DA); |
| 1569 | tmp |= TCSTATUS_IXMT; /* interrupt exempt */ |
| 1570 | write_tc_c0_tcstatus(tmp); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1571 | } |
| 1572 | } |
| 1573 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1574 | out_reenable: |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1575 | /* release config state */ |
Ralf Baechle | 340ee4b | 2005-08-17 17:44:08 +0000 | [diff] [blame] | 1576 | clear_c0_mvpcontrol(MVPCONTROL_VPC); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1577 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1578 | evpe(vpflags); |
| 1579 | emt(mtflags); |
| 1580 | local_irq_restore(flags); |
| 1581 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1582 | #ifdef CONFIG_MIPS_APSP_KSPD |
| 1583 | kspd_events.kspd_sp_exit = kspd_sp_exit; |
| 1584 | #endif |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1585 | return 0; |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1586 | |
Ralf Baechle | 41790e0 | 2007-07-27 19:33:18 +0100 | [diff] [blame] | 1587 | out_class: |
| 1588 | class_unregister(&vpe_class); |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1589 | out_chrdev: |
| 1590 | unregister_chrdev(major, module_name); |
| 1591 | |
Ralf Baechle | 07cc0c9 | 2007-07-27 19:31:10 +0100 | [diff] [blame] | 1592 | out: |
Ralf Baechle | 27a3bba | 2007-02-07 13:48:59 +0000 | [diff] [blame] | 1593 | return err; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1594 | } |
| 1595 | |
| 1596 | static void __exit vpe_module_exit(void) |
| 1597 | { |
| 1598 | struct vpe *v, *n; |
| 1599 | |
| 1600 | list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) { |
| 1601 | if (v->state != VPE_STATE_UNUSED) { |
| 1602 | release_vpe(v); |
| 1603 | } |
| 1604 | } |
| 1605 | |
Kay Sievers | 736fad1 | 2007-10-15 13:42:35 +0200 | [diff] [blame] | 1606 | device_del(&vpe_device); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1607 | unregister_chrdev(major, module_name); |
| 1608 | } |
| 1609 | |
| 1610 | module_init(vpe_module_init); |
| 1611 | module_exit(vpe_module_exit); |
| 1612 | MODULE_DESCRIPTION("MIPS VPE Loader"); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1613 | MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1614 | MODULE_LICENSE("GPL"); |