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> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/ioport.h> |
| 25 | #include <linux/console.h> |
| 26 | #include <linux/utsname.h> |
| 27 | #include <linux/tty.h> |
| 28 | #include <linux/root_dev.h> |
| 29 | #include <linux/notifier.h> |
| 30 | #include <linux/cpu.h> |
| 31 | #include <linux/unistd.h> |
| 32 | #include <linux/serial.h> |
| 33 | #include <linux/serial_8250.h> |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 34 | #include <linux/bootmem.h> |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 35 | #include <linux/pci.h> |
Benjamin Herrenschmidt | 945feb1 | 2008-04-17 14:35:01 +1000 | [diff] [blame] | 36 | #include <linux/lockdep.h> |
David S. Miller | d9b2b2a | 2008-02-13 16:56:49 -0800 | [diff] [blame] | 37 | #include <linux/lmb.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 38 | #include <asm/io.h> |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 39 | #include <asm/kdump.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 40 | #include <asm/prom.h> |
| 41 | #include <asm/processor.h> |
| 42 | #include <asm/pgtable.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 43 | #include <asm/smp.h> |
| 44 | #include <asm/elf.h> |
| 45 | #include <asm/machdep.h> |
| 46 | #include <asm/paca.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 47 | #include <asm/time.h> |
| 48 | #include <asm/cputable.h> |
| 49 | #include <asm/sections.h> |
| 50 | #include <asm/btext.h> |
| 51 | #include <asm/nvram.h> |
| 52 | #include <asm/setup.h> |
| 53 | #include <asm/system.h> |
| 54 | #include <asm/rtas.h> |
| 55 | #include <asm/iommu.h> |
| 56 | #include <asm/serial.h> |
| 57 | #include <asm/cache.h> |
| 58 | #include <asm/page.h> |
| 59 | #include <asm/mmu.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 60 | #include <asm/firmware.h> |
Paul Mackerras | f78541d | 2005-10-28 22:53:37 +1000 | [diff] [blame] | 61 | #include <asm/xmon.h> |
David Gibson | dcad47f | 2005-11-07 09:49:43 +1100 | [diff] [blame] | 62 | #include <asm/udbg.h> |
Michael Ellerman | 593e537 | 2005-11-12 00:06:06 +1100 | [diff] [blame] | 63 | #include <asm/kexec.h> |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 64 | #include <asm/swiotlb.h> |
Benjamin Herrenschmidt | 25d21ad | 2009-07-23 23:15:47 +0000 | [diff] [blame] | 65 | #include <asm/mmu_context.h> |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 66 | |
Stephen Rothwell | 66ba135 | 2005-11-09 11:01:06 +1100 | [diff] [blame] | 67 | #include "setup.h" |
| 68 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 69 | #ifdef DEBUG |
| 70 | #define DBG(fmt...) udbg_printf(fmt) |
| 71 | #else |
| 72 | #define DBG(fmt...) |
| 73 | #endif |
| 74 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 75 | int boot_cpuid = 0; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 76 | u64 ppc64_pft_size; |
| 77 | |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 78 | /* Pick defaults since we might want to patch instructions |
| 79 | * before we've read this from the device tree. |
| 80 | */ |
| 81 | struct ppc64_caches ppc64_caches = { |
Olof Johansson | 5a2fe38 | 2006-09-06 14:34:41 -0500 | [diff] [blame] | 82 | .dline_size = 0x40, |
| 83 | .log_dline_size = 6, |
| 84 | .iline_size = 0x40, |
| 85 | .log_iline_size = 6 |
Olof Johansson | dabcafd | 2005-12-08 19:40:17 -0600 | [diff] [blame] | 86 | }; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 87 | EXPORT_SYMBOL_GPL(ppc64_caches); |
| 88 | |
| 89 | /* |
| 90 | * These are used in binfmt_elf.c to put aux entries on the stack |
| 91 | * for each elf executable being started. |
| 92 | */ |
| 93 | int dcache_bsize; |
| 94 | int icache_bsize; |
| 95 | int ucache_bsize; |
| 96 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 97 | #ifdef CONFIG_SMP |
| 98 | |
| 99 | static int smt_enabled_cmdline; |
| 100 | |
| 101 | /* Look for ibm,smt-enabled OF option */ |
| 102 | static void check_smt_enabled(void) |
| 103 | { |
| 104 | struct device_node *dn; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 105 | const char *smt_option; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 106 | |
| 107 | /* Allow the command line to overrule the OF option */ |
| 108 | if (smt_enabled_cmdline) |
| 109 | return; |
| 110 | |
| 111 | dn = of_find_node_by_path("/options"); |
| 112 | |
| 113 | if (dn) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 114 | smt_option = of_get_property(dn, "ibm,smt-enabled", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 115 | |
| 116 | if (smt_option) { |
| 117 | if (!strcmp(smt_option, "on")) |
| 118 | smt_enabled_at_boot = 1; |
| 119 | else if (!strcmp(smt_option, "off")) |
| 120 | smt_enabled_at_boot = 0; |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /* Look for smt-enabled= cmdline option */ |
| 126 | static int __init early_smt_enabled(char *p) |
| 127 | { |
| 128 | smt_enabled_cmdline = 1; |
| 129 | |
| 130 | if (!p) |
| 131 | return 0; |
| 132 | |
| 133 | if (!strcmp(p, "on") || !strcmp(p, "1")) |
| 134 | smt_enabled_at_boot = 1; |
| 135 | else if (!strcmp(p, "off") || !strcmp(p, "0")) |
| 136 | smt_enabled_at_boot = 0; |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | early_param("smt-enabled", early_smt_enabled); |
| 141 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 142 | #else |
| 143 | #define check_smt_enabled() |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 144 | #endif /* CONFIG_SMP */ |
| 145 | |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 146 | /* Put the paca pointer into r13 and SPRG_PACA */ |
Michael Ellerman | 4ba99b9 | 2006-06-23 18:20:09 +1000 | [diff] [blame] | 147 | void __init setup_paca(int cpu) |
| 148 | { |
| 149 | local_paca = &paca[cpu]; |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 150 | mtspr(SPRN_SPRG_PACA, local_paca); |
Benjamin Herrenschmidt | 25d21ad | 2009-07-23 23:15:47 +0000 | [diff] [blame] | 151 | #ifdef CONFIG_PPC_BOOK3E |
| 152 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
| 153 | #endif |
Michael Ellerman | 4ba99b9 | 2006-06-23 18:20:09 +1000 | [diff] [blame] | 154 | } |
| 155 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 156 | /* |
| 157 | * Early initialization entry point. This is called by head.S |
| 158 | * with MMU translation disabled. We rely on the "feature" of |
| 159 | * the CPU that ignores the top 2 bits of the address in real |
| 160 | * mode so we can access kernel globals normally provided we |
| 161 | * only toy with things in the RMO region. From here, we do |
| 162 | * some early parsing of the device-tree to setup out LMB |
| 163 | * data structures, and allocate & initialize the hash table |
| 164 | * and segment tables so we can start running with translation |
| 165 | * enabled. |
| 166 | * |
| 167 | * It is this function which will call the probe() callback of |
| 168 | * the various platform types and copy the matching one to the |
| 169 | * global ppc_md structure. Your platform can eventually do |
| 170 | * some very early initializations from the probe() routine, but |
| 171 | * this is not recommended, be very careful as, for example, the |
| 172 | * device-tree is not accessible via normal means at this point. |
| 173 | */ |
| 174 | |
| 175 | void __init early_setup(unsigned long dt_ptr) |
| 176 | { |
Benjamin Herrenschmidt | 24d9649 | 2008-05-07 10:00:56 +1000 | [diff] [blame] | 177 | /* -------- printk is _NOT_ safe to use here ! ------- */ |
| 178 | |
Tony Breeds | 90035fe | 2008-04-24 13:43:49 +1000 | [diff] [blame] | 179 | /* Fill in any unititialised pacas */ |
| 180 | initialise_pacas(); |
| 181 | |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 182 | /* Identify CPU type */ |
Paul Mackerras | 974a76f | 2006-11-10 20:38:53 +1100 | [diff] [blame] | 183 | identify_cpu(0, mfspr(SPRN_PVR)); |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 184 | |
Michael Ellerman | 33dbcf7 | 2006-06-28 13:18:53 +1000 | [diff] [blame] | 185 | /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ |
| 186 | setup_paca(0); |
| 187 | |
Benjamin Herrenschmidt | 945feb1 | 2008-04-17 14:35:01 +1000 | [diff] [blame] | 188 | /* Initialize lockdep early or else spinlocks will blow */ |
| 189 | lockdep_init(); |
| 190 | |
Benjamin Herrenschmidt | 24d9649 | 2008-05-07 10:00:56 +1000 | [diff] [blame] | 191 | /* -------- printk is now safe to use ------- */ |
| 192 | |
Benjamin Herrenschmidt | f2fd251 | 2008-05-07 10:25:34 +1000 | [diff] [blame] | 193 | /* Enable early debugging if any specified (see udbg.h) */ |
| 194 | udbg_early_init(); |
| 195 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 196 | DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 197 | |
| 198 | /* |
Linas Vepstas | 3c607ce | 2007-09-07 03:47:29 +1000 | [diff] [blame] | 199 | * Do early initialization using the flattened device |
| 200 | * tree, such as retrieving the physical memory map or |
| 201 | * calculating/retrieving the hash table size. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 202 | */ |
| 203 | early_init_devtree(__va(dt_ptr)); |
| 204 | |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 205 | /* 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] | 206 | setup_paca(boot_cpuid); |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 207 | |
| 208 | /* Fix up paca fields required for the boot cpu */ |
| 209 | get_paca()->cpu_start = 1; |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 210 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 211 | /* Probe the machine type */ |
| 212 | probe_machine(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 213 | |
Michael Ellerman | 4731041 | 2006-05-17 18:00:49 +1000 | [diff] [blame] | 214 | setup_kdump_trampoline(); |
Michael Ellerman | 0cc4746 | 2005-12-04 18:39:37 +1100 | [diff] [blame] | 215 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 216 | DBG("Found, Initializing memory management...\n"); |
| 217 | |
Benjamin Herrenschmidt | 757c74d | 2009-03-19 19:34:16 +0000 | [diff] [blame] | 218 | /* Initialize the hash table or TLB handling */ |
| 219 | early_init_mmu(); |
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 | { |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 227 | /* Mark interrupts enabled in PACA */ |
Benjamin Herrenschmidt | 757c74d | 2009-03-19 19:34:16 +0000 | [diff] [blame] | 228 | get_paca()->soft_enabled = 0; |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 229 | |
Benjamin Herrenschmidt | 757c74d | 2009-03-19 19:34:16 +0000 | [diff] [blame] | 230 | /* Initialize the hash table or TLB handling */ |
| 231 | early_init_mmu_secondary(); |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | #endif /* CONFIG_SMP */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 235 | |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 236 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
| 237 | void smp_release_cpus(void) |
| 238 | { |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 239 | unsigned long *ptr; |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 240 | |
| 241 | DBG(" -> smp_release_cpus()\n"); |
| 242 | |
| 243 | /* All secondary cpus are spinning on a common spinloop, release them |
| 244 | * all now so they can start to spin on their individual paca |
| 245 | * spinloops. For non SMP kernels, the secondary cpus never get out |
| 246 | * of the common spinloop. |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 247 | */ |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 248 | |
Michael Ellerman | 758438a | 2005-12-05 15:49:00 -0600 | [diff] [blame] | 249 | ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop |
| 250 | - PHYSICAL_START); |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 251 | *ptr = __pa(generic_secondary_smp_init); |
Michael Ellerman | b8f5102 | 2005-11-04 12:09:42 +1100 | [diff] [blame] | 252 | mb(); |
| 253 | |
| 254 | DBG(" <- smp_release_cpus()\n"); |
| 255 | } |
| 256 | #endif /* CONFIG_SMP || CONFIG_KEXEC */ |
| 257 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 258 | /* |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 259 | * Initialize some remaining members of the ppc64_caches and systemcfg |
| 260 | * structures |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 261 | * (at least until we get rid of them completely). This is mostly some |
| 262 | * cache informations about the CPU that will be used by cache flush |
| 263 | * routines and/or provided to userland |
| 264 | */ |
| 265 | static void __init initialize_cache_info(void) |
| 266 | { |
| 267 | struct device_node *np; |
| 268 | unsigned long num_cpus = 0; |
| 269 | |
| 270 | DBG(" -> initialize_cache_info()\n"); |
| 271 | |
| 272 | for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { |
| 273 | num_cpus += 1; |
| 274 | |
| 275 | /* We're assuming *all* of the CPUs have the same |
| 276 | * d-cache and i-cache sizes... -Peter |
| 277 | */ |
| 278 | |
| 279 | if ( num_cpus == 1 ) { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 280 | const u32 *sizep, *lsizep; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 281 | u32 size, lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 282 | |
| 283 | size = 0; |
| 284 | lsize = cur_cpu_spec->dcache_bsize; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 285 | sizep = of_get_property(np, "d-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 286 | if (sizep != NULL) |
| 287 | size = *sizep; |
Benjamin Herrenschmidt | 20474ab | 2007-10-28 08:49:28 +1100 | [diff] [blame] | 288 | lsizep = of_get_property(np, "d-cache-block-size", NULL); |
| 289 | /* fallback if block size missing */ |
| 290 | if (lsizep == NULL) |
| 291 | lsizep = of_get_property(np, "d-cache-line-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 292 | if (lsizep != NULL) |
| 293 | lsize = *lsizep; |
| 294 | if (sizep == 0 || lsizep == 0) |
| 295 | DBG("Argh, can't find dcache properties ! " |
| 296 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 297 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 298 | ppc64_caches.dsize = size; |
| 299 | ppc64_caches.dline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 300 | ppc64_caches.log_dline_size = __ilog2(lsize); |
| 301 | ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; |
| 302 | |
| 303 | size = 0; |
| 304 | lsize = cur_cpu_spec->icache_bsize; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 305 | sizep = of_get_property(np, "i-cache-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 306 | if (sizep != NULL) |
| 307 | size = *sizep; |
Benjamin Herrenschmidt | 20474ab | 2007-10-28 08:49:28 +1100 | [diff] [blame] | 308 | lsizep = of_get_property(np, "i-cache-block-size", NULL); |
| 309 | if (lsizep == NULL) |
| 310 | lsizep = of_get_property(np, "i-cache-line-size", NULL); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 311 | if (lsizep != NULL) |
| 312 | lsize = *lsizep; |
| 313 | if (sizep == 0 || lsizep == 0) |
| 314 | DBG("Argh, can't find icache properties ! " |
| 315 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 316 | |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 317 | ppc64_caches.isize = size; |
| 318 | ppc64_caches.iline_size = lsize; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 319 | ppc64_caches.log_iline_size = __ilog2(lsize); |
| 320 | ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; |
| 321 | } |
| 322 | } |
| 323 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 324 | DBG(" <- initialize_cache_info()\n"); |
| 325 | } |
| 326 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 327 | |
| 328 | /* |
| 329 | * Do some initial setup of the system. The parameters are those which |
| 330 | * were passed in from the bootloader. |
| 331 | */ |
| 332 | void __init setup_system(void) |
| 333 | { |
| 334 | DBG(" -> setup_system()\n"); |
| 335 | |
Tony Breeds | 826ea8f | 2007-07-18 16:17:48 +1000 | [diff] [blame] | 336 | /* Apply the CPUs-specific and firmware specific fixups to kernel |
| 337 | * text (nop out sections not relevant to this CPU or this firmware) |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 338 | */ |
Benjamin Herrenschmidt | 0909c8c | 2006-10-20 11:47:18 +1000 | [diff] [blame] | 339 | do_feature_fixups(cur_cpu_spec->cpu_features, |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 340 | &__start___ftr_fixup, &__stop___ftr_fixup); |
Benjamin Herrenschmidt | 7c03d65 | 2008-12-18 19:13:32 +0000 | [diff] [blame] | 341 | do_feature_fixups(cur_cpu_spec->mmu_features, |
| 342 | &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup); |
Tony Breeds | 826ea8f | 2007-07-18 16:17:48 +1000 | [diff] [blame] | 343 | do_feature_fixups(powerpc_firmware_features, |
| 344 | &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); |
Kumar Gala | 2d1b202 | 2008-07-02 01:16:40 +1000 | [diff] [blame] | 345 | do_lwsync_fixups(cur_cpu_spec->cpu_features, |
| 346 | &__start___lwsync_fixup, &__stop___lwsync_fixup); |
Benjamin Herrenschmidt | 42c4aaa | 2006-10-24 16:42:40 +1000 | [diff] [blame] | 347 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 348 | /* |
| 349 | * Unflatten the device-tree passed by prom_init or kexec |
| 350 | */ |
| 351 | unflatten_device_tree(); |
| 352 | |
| 353 | /* |
| 354 | * Fill the ppc64_caches & systemcfg structures with informations |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 355 | * retrieved from the device-tree. |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 356 | */ |
| 357 | initialize_cache_info(); |
| 358 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 359 | /* |
| 360 | * Initialize irq remapping subsystem |
| 361 | */ |
| 362 | irq_early_init(); |
| 363 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 364 | #ifdef CONFIG_PPC_RTAS |
| 365 | /* |
| 366 | * Initialize RTAS if available |
| 367 | */ |
| 368 | rtas_initialize(); |
| 369 | #endif /* CONFIG_PPC_RTAS */ |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 370 | |
| 371 | /* |
| 372 | * Check if we have an initrd provided via the device-tree |
| 373 | */ |
| 374 | check_for_initrd(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 375 | |
| 376 | /* |
| 377 | * Do some platform specific early initializations, that includes |
| 378 | * setting up the hash table pointers. It also sets up some interrupt-mapping |
| 379 | * related options that will be used by finish_device_tree() |
| 380 | */ |
Geoff Levand | 57744ea | 2006-11-10 12:01:02 -0800 | [diff] [blame] | 381 | if (ppc_md.init_early) |
| 382 | ppc_md.init_early(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 383 | |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 384 | /* |
| 385 | * We can discover serial ports now since the above did setup the |
| 386 | * hash table management for us, thus ioremap works. We do that early |
| 387 | * so that further code can be debugged |
| 388 | */ |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 389 | find_legacy_serial_ports(); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 390 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 391 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 392 | * Register early console |
| 393 | */ |
| 394 | register_early_udbg_console(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 395 | |
Michael Ellerman | 47679283 | 2006-10-03 14:12:08 +1000 | [diff] [blame] | 396 | /* |
| 397 | * Initialize xmon |
| 398 | */ |
| 399 | xmon_setup(); |
Michael Ellerman | 480f6f3 | 2006-05-17 18:00:41 +1000 | [diff] [blame] | 400 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 401 | check_smt_enabled(); |
| 402 | smp_setup_cpu_maps(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 403 | |
Michael Ellerman | f018b36 | 2006-02-16 14:13:50 +1100 | [diff] [blame] | 404 | #ifdef CONFIG_SMP |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 405 | /* Release secondary cpus out of their spinloops at 0x60 now that |
| 406 | * we can map physical -> logical CPU ids |
| 407 | */ |
| 408 | smp_release_cpus(); |
Michael Ellerman | f018b36 | 2006-02-16 14:13:50 +1100 | [diff] [blame] | 409 | #endif |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 410 | |
Serge E. Hallyn | 96b644b | 2006-10-02 02:18:13 -0700 | [diff] [blame] | 411 | printk("Starting Linux PPC64 %s\n", init_utsname()->version); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 412 | |
| 413 | printk("-----------------------------------------------------\n"); |
Ingo Molnar | fe33332 | 2009-01-06 14:26:03 +0000 | [diff] [blame] | 414 | printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); |
| 415 | printk("physicalMemorySize = 0x%llx\n", lmb_phys_mem_size()); |
Anton Blanchard | 9697add | 2007-10-15 05:33:17 +1000 | [diff] [blame] | 416 | if (ppc64_caches.dline_size != 0x80) |
| 417 | printk("ppc64_caches.dcache_line_size = 0x%x\n", |
| 418 | ppc64_caches.dline_size); |
| 419 | if (ppc64_caches.iline_size != 0x80) |
| 420 | printk("ppc64_caches.icache_line_size = 0x%x\n", |
| 421 | ppc64_caches.iline_size); |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 422 | #ifdef CONFIG_PPC_STD_MMU_64 |
Anton Blanchard | 9697add | 2007-10-15 05:33:17 +1000 | [diff] [blame] | 423 | if (htab_address) |
| 424 | printk("htab_address = 0x%p\n", htab_address); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 425 | printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 426 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
Michael Neuling | b160544 | 2008-10-22 19:39:49 +0000 | [diff] [blame] | 427 | if (PHYSICAL_START > 0) |
Michael Ellerman | e468455 | 2009-06-10 19:05:00 +0000 | [diff] [blame] | 428 | printk("physical_start = 0x%llx\n", |
| 429 | (unsigned long long)PHYSICAL_START); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 430 | printk("-----------------------------------------------------\n"); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 431 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 432 | DBG(" <- setup_system()\n"); |
| 433 | } |
| 434 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 435 | #ifdef CONFIG_IRQSTACKS |
| 436 | static void __init irqstack_early_init(void) |
| 437 | { |
| 438 | unsigned int i; |
| 439 | |
| 440 | /* |
| 441 | * interrupt stacks must be under 256MB, we cannot afford to take |
| 442 | * SLB misses on them. |
| 443 | */ |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 444 | for_each_possible_cpu(i) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 445 | softirq_ctx[i] = (struct thread_info *) |
| 446 | __va(lmb_alloc_base(THREAD_SIZE, |
| 447 | THREAD_SIZE, 0x10000000)); |
| 448 | hardirq_ctx[i] = (struct thread_info *) |
| 449 | __va(lmb_alloc_base(THREAD_SIZE, |
| 450 | THREAD_SIZE, 0x10000000)); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 451 | } |
| 452 | } |
| 453 | #else |
| 454 | #define irqstack_early_init() |
| 455 | #endif |
| 456 | |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 457 | #ifdef CONFIG_PPC_BOOK3E |
| 458 | static void __init exc_lvl_early_init(void) |
| 459 | { |
| 460 | unsigned int i; |
| 461 | |
| 462 | for_each_possible_cpu(i) { |
| 463 | critirq_ctx[i] = (struct thread_info *) |
| 464 | __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); |
| 465 | dbgirq_ctx[i] = (struct thread_info *) |
| 466 | __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); |
| 467 | mcheckirq_ctx[i] = (struct thread_info *) |
| 468 | __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); |
| 469 | } |
| 470 | } |
| 471 | #else |
| 472 | #define exc_lvl_early_init() |
| 473 | #endif |
| 474 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 475 | /* |
| 476 | * Stack space used when we detect a bad kernel stack pointer, and |
| 477 | * early in SMP boots before relocation is enabled. |
| 478 | */ |
| 479 | static void __init emergency_stack_init(void) |
| 480 | { |
| 481 | unsigned long limit; |
| 482 | unsigned int i; |
| 483 | |
| 484 | /* |
| 485 | * Emergency stacks must be under 256MB, we cannot afford to take |
| 486 | * SLB misses on them. The ABI also requires them to be 128-byte |
| 487 | * aligned. |
| 488 | * |
| 489 | * Since we use these as temporary stacks during secondary CPU |
| 490 | * bringup, we need to get at them in real mode. This means they |
| 491 | * must also be within the RMO region. |
| 492 | */ |
Ingo Molnar | fe33332 | 2009-01-06 14:26:03 +0000 | [diff] [blame] | 493 | limit = min(0x10000000ULL, lmb.rmo_size); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 494 | |
Michael Ellerman | 3243d87 | 2008-04-30 13:21:45 +1000 | [diff] [blame] | 495 | for_each_possible_cpu(i) { |
| 496 | unsigned long sp; |
| 497 | sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit); |
| 498 | sp += THREAD_SIZE; |
| 499 | paca[i].emergency_sp = __va(sp); |
| 500 | } |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | /* |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 504 | * Called into from start_kernel, after lock_kernel has been called. |
| 505 | * Initializes bootmem, which is unsed to manage page allocation until |
| 506 | * mem_init is called. |
| 507 | */ |
| 508 | void __init setup_arch(char **cmdline_p) |
| 509 | { |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 510 | ppc64_boot_msg(0x12, "Setup Arch"); |
| 511 | |
| 512 | *cmdline_p = cmd_line; |
| 513 | |
| 514 | /* |
| 515 | * Set cache line size based on type of cpu as a default. |
| 516 | * Systems with OF can look in the properties on the cpu node(s) |
| 517 | * for a possibly more accurate value. |
| 518 | */ |
| 519 | dcache_bsize = ppc64_caches.dline_size; |
| 520 | icache_bsize = ppc64_caches.iline_size; |
| 521 | |
| 522 | /* reboot on panic */ |
| 523 | panic_timeout = 180; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 524 | |
| 525 | if (ppc_md.panic) |
Kumar Gala | 7e99026 | 2006-05-05 00:02:08 -0500 | [diff] [blame] | 526 | setup_panic(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 527 | |
Kumar Gala | 4846c5d | 2008-04-16 05:52:26 +1000 | [diff] [blame] | 528 | init_mm.start_code = (unsigned long)_stext; |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 529 | init_mm.end_code = (unsigned long) _etext; |
| 530 | init_mm.end_data = (unsigned long) _edata; |
| 531 | init_mm.brk = klimit; |
| 532 | |
| 533 | irqstack_early_init(); |
Benjamin Herrenschmidt | 2d27cfd | 2009-07-23 23:15:59 +0000 | [diff] [blame] | 534 | exc_lvl_early_init(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 535 | emergency_stack_init(); |
| 536 | |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 537 | #ifdef CONFIG_PPC_STD_MMU_64 |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 538 | stabs_alloc(); |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 539 | #endif |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 540 | /* set up the bootmem stuff with available memory */ |
| 541 | do_init_bootmem(); |
| 542 | sparse_init(); |
| 543 | |
Paul Mackerras | 0458060 | 2005-10-20 21:00:20 +1000 | [diff] [blame] | 544 | #ifdef CONFIG_DUMMY_CONSOLE |
| 545 | conswitchp = &dummy_con; |
| 546 | #endif |
| 547 | |
Grant Likely | 38db7e7 | 2007-10-11 04:48:18 +1000 | [diff] [blame] | 548 | if (ppc_md.setup_arch) |
| 549 | ppc_md.setup_arch(); |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 550 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 551 | #ifdef CONFIG_SWIOTLB |
| 552 | if (ppc_swiotlb_enable) |
| 553 | swiotlb_init(); |
| 554 | #endif |
| 555 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 556 | paging_init(); |
Benjamin Herrenschmidt | 6f0ef0f | 2009-07-23 23:15:26 +0000 | [diff] [blame] | 557 | |
| 558 | /* Initialize the MMU context management stuff */ |
| 559 | mmu_context_init(); |
| 560 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 561 | ppc64_boot_msg(0x15, "Setup Done"); |
| 562 | } |
| 563 | |
| 564 | |
| 565 | /* ToDo: do something useful if ppc_md is not yet setup. */ |
| 566 | #define PPC64_LINUX_FUNCTION 0x0f000000 |
| 567 | #define PPC64_IPL_MESSAGE 0xc0000000 |
| 568 | #define PPC64_TERM_MESSAGE 0xb0000000 |
| 569 | |
| 570 | static void ppc64_do_msg(unsigned int src, const char *msg) |
| 571 | { |
| 572 | if (ppc_md.progress) { |
| 573 | char buf[128]; |
| 574 | |
| 575 | sprintf(buf, "%08X\n", src); |
| 576 | ppc_md.progress(buf, 0); |
| 577 | snprintf(buf, 128, "%s", msg); |
| 578 | ppc_md.progress(buf, 0); |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* Print a boot progress message. */ |
| 583 | void ppc64_boot_msg(unsigned int src, const char *msg) |
| 584 | { |
| 585 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); |
| 586 | printk("[boot]%04x %s\n", src, msg); |
| 587 | } |
| 588 | |
Paul Mackerras | 40ef8cb | 2005-10-10 22:50:37 +1000 | [diff] [blame] | 589 | void cpu_die(void) |
| 590 | { |
| 591 | if (ppc_md.cpu_die) |
| 592 | ppc_md.cpu_die(); |
| 593 | } |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 594 | |
| 595 | #ifdef CONFIG_SMP |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 596 | #define PCPU_DYN_SIZE () |
| 597 | |
| 598 | static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) |
| 599 | { |
| 600 | return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align, |
| 601 | __pa(MAX_DMA_ADDRESS)); |
| 602 | } |
| 603 | |
| 604 | static void __init pcpu_fc_free(void *ptr, size_t size) |
| 605 | { |
| 606 | free_bootmem(__pa(ptr), size); |
| 607 | } |
| 608 | |
| 609 | static int pcpu_cpu_distance(unsigned int from, unsigned int to) |
| 610 | { |
| 611 | if (cpu_to_node(from) == cpu_to_node(to)) |
| 612 | return LOCAL_DISTANCE; |
| 613 | else |
| 614 | return REMOTE_DISTANCE; |
| 615 | } |
| 616 | |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 617 | void __init setup_per_cpu_areas(void) |
| 618 | { |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 619 | const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE; |
| 620 | size_t atom_size; |
| 621 | unsigned long delta; |
| 622 | unsigned int cpu; |
| 623 | int rc; |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 624 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 625 | /* |
| 626 | * Linear mapping is one of 4K, 1M and 16M. For 4K, no need |
| 627 | * to group units. For larger mappings, use 1M atom which |
| 628 | * should be large enough to contain a number of units. |
| 629 | */ |
| 630 | if (mmu_linear_psize == MMU_PAGE_4K) |
| 631 | atom_size = PAGE_SIZE; |
| 632 | else |
| 633 | atom_size = 1 << 20; |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 634 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 635 | rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance, |
| 636 | pcpu_fc_alloc, pcpu_fc_free); |
| 637 | if (rc < 0) |
| 638 | panic("cannot initialize percpu area (err=%d)", rc); |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 639 | |
Tejun Heo | c2a7e81 | 2009-08-14 15:00:53 +0900 | [diff] [blame] | 640 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; |
| 641 | for_each_possible_cpu(cpu) |
| 642 | paca[cpu].data_offset = delta + pcpu_unit_offsets[cpu]; |
Anton Blanchard | 7a0268f | 2006-01-11 13:16:44 +1100 | [diff] [blame] | 643 | } |
| 644 | #endif |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 645 | |
| 646 | |
| 647 | #ifdef CONFIG_PPC_INDIRECT_IO |
| 648 | struct ppc_pci_io ppc_pci_io; |
| 649 | EXPORT_SYMBOL(ppc_pci_io); |
| 650 | #endif /* CONFIG_PPC_INDIRECT_IO */ |
| 651 | |