arch/powerpc/kernel/setup_32.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/string.h>
   7 #include <linux/sched.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/reboot.h>
  11 #include <linux/delay.h>
  12 #include <linux/initrd.h>
  13 #include <linux/tty.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/cpu.h>
  18 #include <linux/console.h>
  19 #include <linux/memblock.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/prom.h>
  23 #include <asm/processor.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/setup.h>
  26 #include <asm/smp.h>
  27 #include <asm/elf.h>
  28 #include <asm/cputable.h>
  29 #include <asm/bootx.h>
  30 #include <asm/btext.h>
  31 #include <asm/machdep.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/pmac_feature.h>
  34 #include <asm/sections.h>
  35 #include <asm/nvram.h>
  36 #include <asm/xmon.h>
  37 #include <asm/time.h>
  38 #include <asm/serial.h>
  39 #include <asm/udbg.h>
  40 #include <asm/mmu_context.h>
  41
  42 #include "setup.h"
  43
  44 #define DBG(fmt...)
  45
  46 extern void bootx_init(unsigned long r4, unsigned long phys);
  47
  48 int boot_cpuid = -1;
  49 EXPORT_SYMBOL_GPL(boot_cpuid);
  50 int boot_cpuid_phys;
  51 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
  52
  53 int smp_hw_index[NR_CPUS];
  54
  55 unsigned long ISA_DMA_THRESHOLD;
  56 unsigned int DMA_MODE_READ;
  57 unsigned int DMA_MODE_WRITE;
  58
  59 #ifdef CONFIG_VGA_CONSOLE
  60 unsigned long vgacon_remap_base;
  61 EXPORT_SYMBOL(vgacon_remap_base);
  62 #endif
  63
  64 /*
  65  * These are used in binfmt_elf.c to put aux entries on the stack
  66  * for each elf executable being started.
  67  */
  68 int dcache_bsize;
  69 int icache_bsize;
  70 int ucache_bsize;
  71
  72 /*
  73  * We're called here very early in the boot.  We determine the machine
  74  * type and call the appropriate low-level setup functions.
  75  *  -- Cort <cort@fsmlabs.com>
  76  *
  77  * Note that the kernel may be running at an address which is different
  78  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  79  * to access static data (including strings).  -- paulus
  80  */
  81 notrace unsigned long __init early_init(unsigned long dt_ptr)
  82 {
  83         unsigned long offset = reloc_offset();
  84         struct cpu_spec *spec;
  85
  86         /* First zero the BSS -- use memset_io, some platforms don't have
  87          * caches on yet */
  88         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  89                         __bss_stop - __bss_start);
  90
  91         /*
  92          * Identify the CPU type and fix up code sections
  93          * that depend on which cpu we have.
  94          */
  95         spec = identify_cpu(offset, mfspr(SPRN_PVR));
  96
  97         do_feature_fixups(spec->cpu_features,
  98                           PTRRELOC(&__start___ftr_fixup),
  99                           PTRRELOC(&__stop___ftr_fixup));
 100
 101         do_feature_fixups(spec->mmu_features,
 102                           PTRRELOC(&__start___mmu_ftr_fixup),
 103                           PTRRELOC(&__stop___mmu_ftr_fixup));
 104
 105         do_lwsync_fixups(spec->cpu_features,
 106                          PTRRELOC(&__start___lwsync_fixup),
 107                          PTRRELOC(&__stop___lwsync_fixup));
 108
 109         do_final_fixups();
 110
 111         return KERNELBASE + offset;
 112 }
 113
 114
 115 /*
 116  * Find out what kind of machine we're on and save any data we need
 117  * from the early boot process (devtree is copied on pmac by prom_init()).
 118  * This is called very early on the boot process, after a minimal
 119  * MMU environment has been set up but before MMU_init is called.
 120  */
 121 notrace void __init machine_init(u64 dt_ptr)
 122 {
 123         lockdep_init();
 124
 125         /* Enable early debugging if any specified (see udbg.h) */
 126         udbg_early_init();
 127
 128         /* Do some early initialization based on the flat device tree */
 129         early_init_devtree(__va(dt_ptr));
 130
 131         early_init_mmu();
 132
 133         probe_machine();
 134
 135         setup_kdump_trampoline();
 136
 137 #ifdef CONFIG_6xx
 138         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 139             cpu_has_feature(CPU_FTR_CAN_NAP))
 140                 ppc_md.power_save = ppc6xx_idle;
 141 #endif
 142
 143 #ifdef CONFIG_E500
 144         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 145             cpu_has_feature(CPU_FTR_CAN_NAP))
 146                 ppc_md.power_save = e500_idle;
 147 #endif
 148         if (ppc_md.progress)
 149                 ppc_md.progress("id mach(): done", 0x200);
 150 }
 151
 152 /* Checks "l2cr=xxxx" command-line option */
 153 int __init ppc_setup_l2cr(char *str)
 154 {
 155         if (cpu_has_feature(CPU_FTR_L2CR)) {
 156                 unsigned long val = simple_strtoul(str, NULL, 0);
 157                 printk(KERN_INFO "l2cr set to %lx\n", val);
 158                 _set_L2CR(0);           /* force invalidate by disable cache */
 159                 _set_L2CR(val);         /* and enable it */
 160         }
 161         return 1;
 162 }
 163 __setup("l2cr=", ppc_setup_l2cr);
 164
 165 /* Checks "l3cr=xxxx" command-line option */
 166 int __init ppc_setup_l3cr(char *str)
 167 {
 168         if (cpu_has_feature(CPU_FTR_L3CR)) {
 169                 unsigned long val = simple_strtoul(str, NULL, 0);
 170                 printk(KERN_INFO "l3cr set to %lx\n", val);
 171                 _set_L3CR(val);         /* and enable it */
 172         }
 173         return 1;
 174 }
 175 __setup("l3cr=", ppc_setup_l3cr);
 176
 177 #ifdef CONFIG_GENERIC_NVRAM
 178
 179 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 180 unsigned char nvram_read_byte(int addr)
 181 {
 182         if (ppc_md.nvram_read_val)
 183                 return ppc_md.nvram_read_val(addr);
 184         return 0xff;
 185 }
 186 EXPORT_SYMBOL(nvram_read_byte);
 187
 188 void nvram_write_byte(unsigned char val, int addr)
 189 {
 190         if (ppc_md.nvram_write_val)
 191                 ppc_md.nvram_write_val(addr, val);
 192 }
 193 EXPORT_SYMBOL(nvram_write_byte);
 194
 195 ssize_t nvram_get_size(void)
 196 {
 197         if (ppc_md.nvram_size)
 198                 return ppc_md.nvram_size();
 199         return -1;
 200 }
 201 EXPORT_SYMBOL(nvram_get_size);
 202
 203 void nvram_sync(void)
 204 {
 205         if (ppc_md.nvram_sync)
 206                 ppc_md.nvram_sync();
 207 }
 208 EXPORT_SYMBOL(nvram_sync);
 209
 210 #endif /* CONFIG_NVRAM */
 211
 212 int __init ppc_init(void)
 213 {
 214         /* clear the progress line */
 215         if (ppc_md.progress)
 216                 ppc_md.progress("             ", 0xffff);
 217
 218         /* call platform init */
 219         if (ppc_md.init != NULL) {
 220                 ppc_md.init();
 221         }
 222         return 0;
 223 }
 224
 225 arch_initcall(ppc_init);
 226
 227 static void __init irqstack_early_init(void)
 228 {
 229         unsigned int i;
 230
 231         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 232          * as the memblock is limited to lowmem by default */
 233         for_each_possible_cpu(i) {
 234                 softirq_ctx[i] = (struct thread_info *)
 235                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 236                 hardirq_ctx[i] = (struct thread_info *)
 237                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 238         }
 239 }
 240
 241 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 242 static void __init exc_lvl_early_init(void)
 243 {
 244         unsigned int i, hw_cpu;
 245
 246         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 247          * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
 248         for_each_possible_cpu(i) {
 249                 hw_cpu = get_hard_smp_processor_id(i);
 250                 critirq_ctx[hw_cpu] = (struct thread_info *)
 251                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 252 #ifdef CONFIG_BOOKE
 253                 dbgirq_ctx[hw_cpu] = (struct thread_info *)
 254                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 255                 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
 256                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 257 #endif
 258         }
 259 }
 260 #else
 261 #define exc_lvl_early_init()
 262 #endif
 263
 264 /* Warning, IO base is not yet inited */
 265 void __init setup_arch(char **cmdline_p)
 266 {
 267         *cmdline_p = cmd_line;
 268
 269         /* so udelay does something sensible, assume <= 1000 bogomips */
 270         loops_per_jiffy = 500000000 / HZ;
 271
 272         unflatten_device_tree();
 273         check_for_initrd();
 274
 275         if (ppc_md.init_early)
 276                 ppc_md.init_early();
 277
 278         find_legacy_serial_ports();
 279
 280         smp_setup_cpu_maps();
 281
 282         /* Register early console */
 283         register_early_udbg_console();
 284
 285         xmon_setup();
 286
 287         /*
 288          * Set cache line size based on type of cpu as a default.
 289          * Systems with OF can look in the properties on the cpu node(s)
 290          * for a possibly more accurate value.
 291          */
 292         dcache_bsize = cur_cpu_spec->dcache_bsize;
 293         icache_bsize = cur_cpu_spec->icache_bsize;
 294         ucache_bsize = 0;
 295         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 296                 ucache_bsize = icache_bsize = dcache_bsize;
 297
 298         /* reboot on panic */
 299         panic_timeout = 180;
 300
 301         if (ppc_md.panic)
 302                 setup_panic();
 303
 304         init_mm.start_code = (unsigned long)_stext;
 305         init_mm.end_code = (unsigned long) _etext;
 306         init_mm.end_data = (unsigned long) _edata;
 307         init_mm.brk = klimit;
 308
 309         exc_lvl_early_init();
 310
 311         irqstack_early_init();
 312
 313         /* set up the bootmem stuff with available memory */
 314         do_init_bootmem();
 315         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 316
 317 #ifdef CONFIG_DUMMY_CONSOLE
 318         conswitchp = &dummy_con;
 319 #endif
 320
 321         if (ppc_md.setup_arch)
 322                 ppc_md.setup_arch();
 323         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 324
 325         paging_init();
 326
 327         /* Initialize the MMU context management stuff */
 328         mmu_context_init();
 329
 330 }