Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Common boot and setup code. |
| 4 | * |
| 5 | * Copyright (C) 2001 PPC64 Team, IBM Corp |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #undef DEBUG |
| 14 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/reboot.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/initrd.h> |
| 23 | #include <linux/ide.h> |
| 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/ioport.h> |
| 26 | #include <linux/console.h> |
| 27 | #include <linux/utsname.h> |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/root_dev.h> |
| 30 | #include <linux/notifier.h> |
| 31 | #include <linux/cpu.h> |
| 32 | #include <linux/unistd.h> |
| 33 | #include <linux/serial.h> |
| 34 | #include <linux/serial_8250.h> |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 35 | #include <linux/bootmem.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 36 | #include <asm/io.h> |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 37 | #include <asm/kdump.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 38 | #include <asm/prom.h> |
| 39 | #include <asm/processor.h> |
| 40 | #include <asm/pgtable.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 41 | #include <asm/smp.h> |
| 42 | #include <asm/elf.h> |
| 43 | #include <asm/machdep.h> |
| 44 | #include <asm/paca.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 45 | #include <asm/time.h> |
| 46 | #include <asm/cputable.h> |
| 47 | #include <asm/sections.h> |
| 48 | #include <asm/btext.h> |
| 49 | #include <asm/nvram.h> |
| 50 | #include <asm/setup.h> |
| 51 | #include <asm/system.h> |
| 52 | #include <asm/rtas.h> |
| 53 | #include <asm/iommu.h> |
| 54 | #include <asm/serial.h> |
| 55 | #include <asm/cache.h> |
| 56 | #include <asm/page.h> |
| 57 | #include <asm/mmu.h> |
| 58 | #include <asm/lmb.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 59 | #include <asm/firmware.h> |
Paul Mackerras | f78541d | 2005-10-28 22:53:37 +1000 | [diff] [blame] | 60 | #include <asm/xmon.h> |
David Gibson | dcad47f | 2005-11-07 09:49:43 +1100 | [diff] [blame] | 61 | #include <asm/udbg.h> |
Michael Ellerman | 593e537 | 2005-11-12 00:06:06 +1100 | [diff] [blame] | 62 | #include <asm/kexec.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 63 | |
Stephen Rothwell | 66ba135 | 2005-11-09 11:01:06 +1100 | [diff] [blame] | 64 | #include "setup.h" |
| 65 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 66 | #ifdef DEBUG |
| 67 | #define DBG(fmt...) udbg_printf(fmt) |
| 68 | #else |
| 69 | #define DBG(fmt...) |
| 70 | #endif |
| 71 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 72 | int have_of = 1; |
| 73 | int boot_cpuid = 0; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 74 | dev_t boot_dev; |
| 75 | u64 ppc64_pft_size; |
| 76 | |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 77 | /* Pick defaults since we might want to patch instructions |
| 78 | * before we've read this from the device tree. |
| 79 | */ |
| 80 | struct ppc64_caches ppc64_caches = { |
Olof Johansson | 5a2fe38 | 2006-09-06 14:34:41 -0500 | [diff] [blame] | 81 | .dline_size = 0x40, |
| 82 | .log_dline_size = 6, |
| 83 | .iline_size = 0x40, |
| 84 | .log_iline_size = 6 |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 85 | }; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 86 | EXPORT_SYMBOL_GPL(ppc64_caches); |
| 87 | |
| 88 | /* |
| 89 | * These are used in binfmt_elf.c to put aux entries on the stack |
| 90 | * for each elf executable being started. |
| 91 | */ |
| 92 | int dcache_bsize; |
| 93 | int icache_bsize; |
| 94 | int ucache_bsize; |
| 95 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 96 | #ifdef CONFIG_SMP |
| 97 | |
| 98 | static int smt_enabled_cmdline; |
| 99 | |
| 100 | /* Look for ibm,smt-enabled OF option */ |
| 101 | static void check_smt_enabled(void) |
| 102 | { |
| 103 | struct device_node *dn; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 104 | const char *smt_option; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 105 | |
| 106 | /* Allow the command line to overrule the OF option */ |
| 107 | if (smt_enabled_cmdline) |
| 108 | return; |
| 109 | |
| 110 | dn = of_find_node_by_path("/options"); |
| 111 | |
| 112 | if (dn) { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 113 | smt_option = get_property(dn, "ibm,smt-enabled", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 114 | |
| 115 | if (smt_option) { |
| 116 | if (!strcmp(smt_option, "on")) |
| 117 | smt_enabled_at_boot = 1; |
| 118 | else if (!strcmp(smt_option, "off")) |
| 119 | smt_enabled_at_boot = 0; |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /* Look for smt-enabled= cmdline option */ |
| 125 | static int __init early_smt_enabled(char *p) |
| 126 | { |
| 127 | smt_enabled_cmdline = 1; |
| 128 | |
| 129 | if (!p) |
| 130 | return 0; |
| 131 | |
| 132 | if (!strcmp(p, "on") || !strcmp(p, "1")) |
| 133 | smt_enabled_at_boot = 1; |
| 134 | else if (!strcmp(p, "off") || !strcmp(p, "0")) |
| 135 | smt_enabled_at_boot = 0; |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | early_param("smt-enabled", early_smt_enabled); |
| 140 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 141 | #else |
| 142 | #define check_smt_enabled() |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 143 | #endif /* CONFIG_SMP */ |
| 144 | |
Michael Ellerman | 4ba99b9 | 2006-06-23 18:20:09 +1000 | [diff] [blame] | 145 | /* Put the paca pointer into r13 and SPRG3 */ |
| 146 | void __init setup_paca(int cpu) |
| 147 | { |
| 148 | local_paca = &paca[cpu]; |
| 149 | mtspr(SPRN_SPRG3, local_paca); |
| 150 | } |
| 151 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 152 | /* |
| 153 | * Early initialization entry point. This is called by head.S |
| 154 | * with MMU translation disabled. We rely on the "feature" of |
| 155 | * the CPU that ignores the top 2 bits of the address in real |
| 156 | * mode so we can access kernel globals normally provided we |
| 157 | * only toy with things in the RMO region. From here, we do |
| 158 | * some early parsing of the device-tree to setup out LMB |
| 159 | * data structures, and allocate & initialize the hash table |
| 160 | * and segment tables so we can start running with translation |
| 161 | * enabled. |
| 162 | * |
| 163 | * It is this function which will call the probe() callback of |
| 164 | * the various platform types and copy the matching one to the |
| 165 | * global ppc_md structure. Your platform can eventually do |
| 166 | * some very early initializations from the probe() routine, but |
| 167 | * this is not recommended, be very careful as, for example, the |
| 168 | * device-tree is not accessible via normal means at this point. |
| 169 | */ |
| 170 | |
| 171 | void __init early_setup(unsigned long dt_ptr) |
| 172 | { |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 173 | /* Identify CPU type */ |
| 174 | identify_cpu(0); |
| 175 | |
Michael Ellerman | 33dbcf7 | 2006-06-28 13:18:53 +1000 | [diff] [blame] | 176 | /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ |
| 177 | setup_paca(0); |
| 178 | |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 179 | /* Enable early debugging if any specified (see udbg.h) */ |
| 180 | udbg_early_init(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 181 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 182 | DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 183 | |
| 184 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 185 | * Do early initializations using the flattened device |
| 186 | * tree, like retreiving the physical memory map or |
| 187 | * calculating/retreiving the hash table size |
| 188 | */ |
| 189 | early_init_devtree(__va(dt_ptr)); |
| 190 | |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 191 | /* Now we know the logical id of our boot cpu, setup the paca. */ |
Michael Ellerman | 4ba99b9 | 2006-06-23 18:20:09 +1000 | [diff] [blame] | 192 | setup_paca(boot_cpuid); |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 193 | |
| 194 | /* Fix up paca fields required for the boot cpu */ |
| 195 | get_paca()->cpu_start = 1; |
| 196 | get_paca()->stab_real = __pa((u64)&initial_stab); |
| 197 | get_paca()->stab_addr = (u64)&initial_stab; |
| 198 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 199 | /* Probe the machine type */ |
| 200 | probe_machine(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 201 | |
Michael Ellerman | 4731041 | 2006-05-17 18:00:49 +1000 | [diff] [blame] | 202 | setup_kdump_trampoline(); |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 203 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 204 | DBG("Found, Initializing memory management...\n"); |
| 205 | |
| 206 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 207 | * Initialize the MMU Hash table and create the linear mapping |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 208 | * of memory. Has to be done before stab/slb initialization as |
| 209 | * this is currently where the page size encoding is obtained |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 210 | */ |
| 211 | htab_initialize(); |
| 212 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 213 | /* |
| 214 | * Initialize stab / SLB management except on iSeries |
| 215 | */ |
Stephen Rothwell | 856d08e | 2006-04-02 02:45:04 +1000 | [diff] [blame] | 216 | if (cpu_has_feature(CPU_FTR_SLB)) |
| 217 | slb_initialize(); |
| 218 | else if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
| 219 | stab_initialize(get_paca()->stab_real); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 220 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 221 | DBG(" <- early_setup()\n"); |
| 222 | } |
| 223 | |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 224 | #ifdef CONFIG_SMP |
| 225 | void early_setup_secondary(void) |
| 226 | { |
| 227 | struct paca_struct *lpaca = get_paca(); |
| 228 | |
| 229 | /* Mark enabled in PACA */ |
| 230 | lpaca->proc_enabled = 0; |
| 231 | |
| 232 | /* Initialize hash table for that CPU */ |
| 233 | htab_initialize_secondary(); |
| 234 | |
| 235 | /* Initialize STAB/SLB. We use a virtual address as it works |
| 236 | * in real mode on pSeries and we want a virutal address on |
| 237 | * iSeries anyway |
| 238 | */ |
| 239 | if (cpu_has_feature(CPU_FTR_SLB)) |
| 240 | slb_initialize(); |
| 241 | else |
| 242 | stab_initialize(lpaca->stab_addr); |
| 243 | } |
| 244 | |
| 245 | #endif /* CONFIG_SMP */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 246 | |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 247 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
| 248 | void smp_release_cpus(void) |
| 249 | { |
| 250 | extern unsigned long __secondary_hold_spinloop; |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 251 | unsigned long *ptr; |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 252 | |
| 253 | DBG(" -> smp_release_cpus()\n"); |
| 254 | |
| 255 | /* All secondary cpus are spinning on a common spinloop, release them |
| 256 | * all now so they can start to spin on their individual paca |
| 257 | * spinloops. For non SMP kernels, the secondary cpus never get out |
| 258 | * of the common spinloop. |
| 259 | * This is useless but harmless on iSeries, secondaries are already |
| 260 | * waiting on their paca spinloops. */ |
| 261 | |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 262 | ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop |
| 263 | - PHYSICAL_START); |
| 264 | *ptr = 1; |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 265 | mb(); |
| 266 | |
| 267 | DBG(" <- smp_release_cpus()\n"); |
| 268 | } |
| 269 | #endif /* CONFIG_SMP || CONFIG_KEXEC */ |
| 270 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 271 | /* |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 272 | * Initialize some remaining members of the ppc64_caches and systemcfg |
| 273 | * structures |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 274 | * (at least until we get rid of them completely). This is mostly some |
| 275 | * cache informations about the CPU that will be used by cache flush |
| 276 | * routines and/or provided to userland |
| 277 | */ |
| 278 | static void __init initialize_cache_info(void) |
| 279 | { |
| 280 | struct device_node *np; |
| 281 | unsigned long num_cpus = 0; |
| 282 | |
| 283 | DBG(" -> initialize_cache_info()\n"); |
| 284 | |
| 285 | for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { |
| 286 | num_cpus += 1; |
| 287 | |
| 288 | /* We're assuming *all* of the CPUs have the same |
| 289 | * d-cache and i-cache sizes... -Peter |
| 290 | */ |
| 291 | |
| 292 | if ( num_cpus == 1 ) { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 293 | const u32 *sizep, *lsizep; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 294 | u32 size, lsize; |
| 295 | const char *dc, *ic; |
| 296 | |
| 297 | /* Then read cache informations */ |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 298 | if (machine_is(powermac)) { |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 299 | dc = "d-cache-block-size"; |
| 300 | ic = "i-cache-block-size"; |
| 301 | } else { |
| 302 | dc = "d-cache-line-size"; |
| 303 | ic = "i-cache-line-size"; |
| 304 | } |
| 305 | |
| 306 | size = 0; |
| 307 | lsize = cur_cpu_spec->dcache_bsize; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 308 | sizep = get_property(np, "d-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 309 | if (sizep != NULL) |
| 310 | size = *sizep; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 311 | lsizep = get_property(np, dc, NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 312 | if (lsizep != NULL) |
| 313 | lsize = *lsizep; |
| 314 | if (sizep == 0 || lsizep == 0) |
| 315 | DBG("Argh, can't find dcache properties ! " |
| 316 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 317 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 318 | ppc64_caches.dsize = size; |
| 319 | ppc64_caches.dline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 320 | ppc64_caches.log_dline_size = __ilog2(lsize); |
| 321 | ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; |
| 322 | |
| 323 | size = 0; |
| 324 | lsize = cur_cpu_spec->icache_bsize; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 325 | sizep = get_property(np, "i-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 326 | if (sizep != NULL) |
| 327 | size = *sizep; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 328 | lsizep = get_property(np, ic, NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 329 | if (lsizep != NULL) |
| 330 | lsize = *lsizep; |
| 331 | if (sizep == 0 || lsizep == 0) |
| 332 | DBG("Argh, can't find icache properties ! " |
| 333 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 334 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 335 | ppc64_caches.isize = size; |
| 336 | ppc64_caches.iline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 337 | ppc64_caches.log_iline_size = __ilog2(lsize); |
| 338 | ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; |
| 339 | } |
| 340 | } |
| 341 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 342 | DBG(" <- initialize_cache_info()\n"); |
| 343 | } |
| 344 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 345 | |
| 346 | /* |
| 347 | * Do some initial setup of the system. The parameters are those which |
| 348 | * were passed in from the bootloader. |
| 349 | */ |
| 350 | void __init setup_system(void) |
| 351 | { |
| 352 | DBG(" -> setup_system()\n"); |
| 353 | |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 354 | /* Apply the CPUs-specific and firmware specific fixups to kernel |
| 355 | * text (nop out sections not relevant to this CPU or this firmware) |
| 356 | */ |
Benjamin Herrenschmidt | 0909c8c | 2006-10-20 11:47:18 +1000 | [diff] [blame] | 357 | do_feature_fixups(cur_cpu_spec->cpu_features, |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 358 | &__start___ftr_fixup, &__stop___ftr_fixup); |
Benjamin Herrenschmidt | 0909c8c | 2006-10-20 11:47:18 +1000 | [diff] [blame] | 359 | do_feature_fixups(powerpc_firmware_features, |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 360 | &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); |
| 361 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 362 | /* |
| 363 | * Unflatten the device-tree passed by prom_init or kexec |
| 364 | */ |
| 365 | unflatten_device_tree(); |
| 366 | |
| 367 | /* |
| 368 | * Fill the ppc64_caches & systemcfg structures with informations |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 369 | * retrieved from the device-tree. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 370 | */ |
| 371 | initialize_cache_info(); |
| 372 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 373 | /* |
| 374 | * Initialize irq remapping subsystem |
| 375 | */ |
| 376 | irq_early_init(); |
| 377 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 378 | #ifdef CONFIG_PPC_RTAS |
| 379 | /* |
| 380 | * Initialize RTAS if available |
| 381 | */ |
| 382 | rtas_initialize(); |
| 383 | #endif /* CONFIG_PPC_RTAS */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 384 | |
| 385 | /* |
| 386 | * Check if we have an initrd provided via the device-tree |
| 387 | */ |
| 388 | check_for_initrd(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 389 | |
| 390 | /* |
| 391 | * Do some platform specific early initializations, that includes |
| 392 | * setting up the hash table pointers. It also sets up some interrupt-mapping |
| 393 | * related options that will be used by finish_device_tree() |
| 394 | */ |
| 395 | ppc_md.init_early(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 396 | |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 397 | /* |
| 398 | * We can discover serial ports now since the above did setup the |
| 399 | * hash table management for us, thus ioremap works. We do that early |
| 400 | * so that further code can be debugged |
| 401 | */ |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 402 | find_legacy_serial_ports(); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 403 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 404 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 405 | * Register early console |
| 406 | */ |
| 407 | register_early_udbg_console(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 408 | |
Michael Ellerman | 47679283 | 2006-10-03 14:12:08 +1000 | [diff] [blame] | 409 | /* |
| 410 | * Initialize xmon |
| 411 | */ |
| 412 | xmon_setup(); |
Michael Ellerman | 480f6f3 | 2006-05-17 18:00:41 +1000 | [diff] [blame] | 413 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 414 | check_smt_enabled(); |
| 415 | smp_setup_cpu_maps(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 416 | |
Michael Ellerman | f018b36 | 2006-02-16 14:13:50 +1100 | [diff] [blame] | 417 | #ifdef CONFIG_SMP |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 418 | /* Release secondary cpus out of their spinloops at 0x60 now that |
| 419 | * we can map physical -> logical CPU ids |
| 420 | */ |
| 421 | smp_release_cpus(); |
Michael Ellerman | f018b36 | 2006-02-16 14:13:50 +1100 | [diff] [blame] | 422 | #endif |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 423 | |
Serge E. Hallyn | 96b644b | 2006-10-02 02:18:13 -0700 | [diff] [blame] | 424 | printk("Starting Linux PPC64 %s\n", init_utsname()->version); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 425 | |
| 426 | printk("-----------------------------------------------------\n"); |
| 427 | printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 428 | printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 429 | printk("ppc64_caches.dcache_line_size = 0x%x\n", |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 430 | ppc64_caches.dline_size); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 431 | printk("ppc64_caches.icache_line_size = 0x%x\n", |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 432 | ppc64_caches.iline_size); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 433 | printk("htab_address = 0x%p\n", htab_address); |
| 434 | printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); |
Michael Ellerman | 398ab1f | 2005-12-04 18:39:23 +1100 | [diff] [blame] | 435 | #if PHYSICAL_START > 0 |
| 436 | printk("physical_start = 0x%x\n", PHYSICAL_START); |
| 437 | #endif |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 438 | printk("-----------------------------------------------------\n"); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 439 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 440 | DBG(" <- setup_system()\n"); |
| 441 | } |
| 442 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 443 | #ifdef CONFIG_IRQSTACKS |
| 444 | static void __init irqstack_early_init(void) |
| 445 | { |
| 446 | unsigned int i; |
| 447 | |
| 448 | /* |
| 449 | * interrupt stacks must be under 256MB, we cannot afford to take |
| 450 | * SLB misses on them. |
| 451 | */ |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 452 | for_each_possible_cpu(i) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 453 | softirq_ctx[i] = (struct thread_info *) |
| 454 | __va(lmb_alloc_base(THREAD_SIZE, |
| 455 | THREAD_SIZE, 0x10000000)); |
| 456 | hardirq_ctx[i] = (struct thread_info *) |
| 457 | __va(lmb_alloc_base(THREAD_SIZE, |
| 458 | THREAD_SIZE, 0x10000000)); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 459 | } |
| 460 | } |
| 461 | #else |
| 462 | #define irqstack_early_init() |
| 463 | #endif |
| 464 | |
| 465 | /* |
| 466 | * Stack space used when we detect a bad kernel stack pointer, and |
| 467 | * early in SMP boots before relocation is enabled. |
| 468 | */ |
| 469 | static void __init emergency_stack_init(void) |
| 470 | { |
| 471 | unsigned long limit; |
| 472 | unsigned int i; |
| 473 | |
| 474 | /* |
| 475 | * Emergency stacks must be under 256MB, we cannot afford to take |
| 476 | * SLB misses on them. The ABI also requires them to be 128-byte |
| 477 | * aligned. |
| 478 | * |
| 479 | * Since we use these as temporary stacks during secondary CPU |
| 480 | * bringup, we need to get at them in real mode. This means they |
| 481 | * must also be within the RMO region. |
| 482 | */ |
| 483 | limit = min(0x10000000UL, lmb.rmo_size); |
| 484 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 485 | for_each_possible_cpu(i) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 486 | paca[i].emergency_sp = |
| 487 | __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 491 | * Called into from start_kernel, after lock_kernel has been called. |
| 492 | * Initializes bootmem, which is unsed to manage page allocation until |
| 493 | * mem_init is called. |
| 494 | */ |
| 495 | void __init setup_arch(char **cmdline_p) |
| 496 | { |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 497 | ppc64_boot_msg(0x12, "Setup Arch"); |
| 498 | |
| 499 | *cmdline_p = cmd_line; |
| 500 | |
| 501 | /* |
| 502 | * Set cache line size based on type of cpu as a default. |
| 503 | * Systems with OF can look in the properties on the cpu node(s) |
| 504 | * for a possibly more accurate value. |
| 505 | */ |
| 506 | dcache_bsize = ppc64_caches.dline_size; |
| 507 | icache_bsize = ppc64_caches.iline_size; |
| 508 | |
| 509 | /* reboot on panic */ |
| 510 | panic_timeout = 180; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 511 | |
| 512 | if (ppc_md.panic) |
Kumar Gala | 7e99026 | 2006-05-05 00:02:08 -0500 | [diff] [blame] | 513 | setup_panic(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 514 | |
| 515 | init_mm.start_code = PAGE_OFFSET; |
| 516 | init_mm.end_code = (unsigned long) _etext; |
| 517 | init_mm.end_data = (unsigned long) _edata; |
| 518 | init_mm.brk = klimit; |
| 519 | |
| 520 | irqstack_early_init(); |
| 521 | emergency_stack_init(); |
| 522 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 523 | stabs_alloc(); |
| 524 | |
| 525 | /* set up the bootmem stuff with available memory */ |
| 526 | do_init_bootmem(); |
| 527 | sparse_init(); |
| 528 | |
Paul Mackerras | 0458060 | 2005-10-20 21:00:20 +1000 | [diff] [blame] | 529 | #ifdef CONFIG_DUMMY_CONSOLE |
| 530 | conswitchp = &dummy_con; |
| 531 | #endif |
| 532 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 533 | ppc_md.setup_arch(); |
| 534 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 535 | paging_init(); |
| 536 | ppc64_boot_msg(0x15, "Setup Done"); |
| 537 | } |
| 538 | |
| 539 | |
| 540 | /* ToDo: do something useful if ppc_md is not yet setup. */ |
| 541 | #define PPC64_LINUX_FUNCTION 0x0f000000 |
| 542 | #define PPC64_IPL_MESSAGE 0xc0000000 |
| 543 | #define PPC64_TERM_MESSAGE 0xb0000000 |
| 544 | |
| 545 | static void ppc64_do_msg(unsigned int src, const char *msg) |
| 546 | { |
| 547 | if (ppc_md.progress) { |
| 548 | char buf[128]; |
| 549 | |
| 550 | sprintf(buf, "%08X\n", src); |
| 551 | ppc_md.progress(buf, 0); |
| 552 | snprintf(buf, 128, "%s", msg); |
| 553 | ppc_md.progress(buf, 0); |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | /* Print a boot progress message. */ |
| 558 | void ppc64_boot_msg(unsigned int src, const char *msg) |
| 559 | { |
| 560 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); |
| 561 | printk("[boot]%04x %s\n", src, msg); |
| 562 | } |
| 563 | |
| 564 | /* Print a termination message (print only -- does not stop the kernel) */ |
| 565 | void ppc64_terminate_msg(unsigned int src, const char *msg) |
| 566 | { |
| 567 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); |
| 568 | printk("[terminate]%04x %s\n", src, msg); |
| 569 | } |
| 570 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 571 | void cpu_die(void) |
| 572 | { |
| 573 | if (ppc_md.cpu_die) |
| 574 | ppc_md.cpu_die(); |
| 575 | } |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 576 | |
| 577 | #ifdef CONFIG_SMP |
| 578 | void __init setup_per_cpu_areas(void) |
| 579 | { |
| 580 | int i; |
| 581 | unsigned long size; |
| 582 | char *ptr; |
| 583 | |
| 584 | /* Copy section for each CPU (we discard the original) */ |
| 585 | size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); |
| 586 | #ifdef CONFIG_MODULES |
| 587 | if (size < PERCPU_ENOUGH_ROOM) |
| 588 | size = PERCPU_ENOUGH_ROOM; |
| 589 | #endif |
| 590 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 591 | for_each_possible_cpu(i) { |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 592 | ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size); |
| 593 | if (!ptr) |
| 594 | panic("Cannot allocate cpu data for CPU %d\n", i); |
| 595 | |
| 596 | paca[i].data_offset = ptr - __per_cpu_start; |
| 597 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
| 598 | } |
| 599 | } |
| 600 | #endif |