arch/sparc/kernel/setup_32.c

   1 /*
   2  *  linux/arch/sparc/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/stddef.h>
  13 #include <linux/unistd.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/slab.h>
  16 #include <linux/initrd.h>
  17 #include <asm/smp.h>
  18 #include <linux/user.h>
  19 #include <linux/screen_info.h>
  20 #include <linux/delay.h>
  21 #include <linux/fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/major.h>
  26 #include <linux/string.h>
  27 #include <linux/init.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/console.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/root_dev.h>
  32 #include <linux/cpu.h>
  33 #include <linux/kdebug.h>
  34 #include <linux/export.h>
  35
  36 #include <asm/system.h>
  37 #include <asm/io.h>
  38 #include <asm/processor.h>
  39 #include <asm/oplib.h>
  40 #include <asm/page.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/traps.h>
  43 #include <asm/vaddrs.h>
  44 #include <asm/mbus.h>
  45 #include <asm/idprom.h>
  46 #include <asm/machines.h>
  47 #include <asm/cpudata.h>
  48 #include <asm/setup.h>
  49
  50 #include "kernel.h"
  51
  52 struct screen_info screen_info = {
  53         0, 0,                   /* orig-x, orig-y */
  54         0,                      /* unused */
  55         0,                      /* orig-video-page */
  56         0,                      /* orig-video-mode */
  57         128,                    /* orig-video-cols */
  58         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  59         54,                     /* orig-video-lines */
  60         0,                      /* orig-video-isVGA */
  61         16                      /* orig-video-points */
  62 };
  63
  64 /* Typing sync at the prom prompt calls the function pointed to by
  65  * romvec->pv_synchook which I set to the following function.
  66  * This should sync all filesystems and return, for now it just
  67  * prints out pretty messages and returns.
  68  */
  69
  70 extern unsigned long trapbase;
  71
  72 /* Pretty sick eh? */
  73 static void prom_sync_me(void)
  74 {
  75         unsigned long prom_tbr, flags;
  76
  77         /* XXX Badly broken. FIX! - Anton */
  78         local_irq_save(flags);
  79         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  80         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  81                              "nop\n\t"
  82                              "nop\n\t"
  83                              "nop\n\t" : : "r" (&trapbase));
  84
  85         prom_printf("PROM SYNC COMMAND...\n");
  86         show_free_areas(0);
  87         if (!is_idle_task(current)) {
  88                 local_irq_enable();
  89                 sys_sync();
  90                 local_irq_disable();
  91         }
  92         prom_printf("Returning to prom\n");
  93
  94         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  95                              "nop\n\t"
  96                              "nop\n\t"
  97                              "nop\n\t" : : "r" (prom_tbr));
  98         local_irq_restore(flags);
  99 }
 100
 101 static unsigned int boot_flags __initdata = 0;
 102 #define BOOTME_DEBUG  0x1
 103
 104 /* Exported for mm/init.c:paging_init. */
 105 unsigned long cmdline_memory_size __initdata = 0;
 106
 107 /* which CPU booted us (0xff = not set) */
 108 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
 109 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */
 110
 111 static void
 112 prom_console_write(struct console *con, const char *s, unsigned n)
 113 {
 114         prom_write(s, n);
 115 }
 116
 117 static struct console prom_early_console = {
 118         .name =         "earlyprom",
 119         .write =        prom_console_write,
 120         .flags =        CON_PRINTBUFFER | CON_BOOT,
 121         .index =        -1,
 122 };
 123
 124 /*
 125  * Process kernel command line switches that are specific to the
 126  * SPARC or that require special low-level processing.
 127  */
 128 static void __init process_switch(char c)
 129 {
 130         switch (c) {
 131         case 'd':
 132                 boot_flags |= BOOTME_DEBUG;
 133                 break;
 134         case 's':
 135                 break;
 136         case 'h':
 137                 prom_printf("boot_flags_init: Halt!\n");
 138                 prom_halt();
 139                 break;
 140         case 'p':
 141                 prom_early_console.flags &= ~CON_BOOT;
 142                 break;
 143         default:
 144                 printk("Unknown boot switch (-%c)\n", c);
 145                 break;
 146         }
 147 }
 148
 149 static void __init boot_flags_init(char *commands)
 150 {
 151         while (*commands) {
 152                 /* Move to the start of the next "argument". */
 153                 while (*commands && *commands == ' ')
 154                         commands++;
 155
 156                 /* Process any command switches, otherwise skip it. */
 157                 if (*commands == '\0')
 158                         break;
 159                 if (*commands == '-') {
 160                         commands++;
 161                         while (*commands && *commands != ' ')
 162                                 process_switch(*commands++);
 163                         continue;
 164                 }
 165                 if (!strncmp(commands, "mem=", 4)) {
 166                         /*
 167                          * "mem=XXX[kKmM] overrides the PROM-reported
 168                          * memory size.
 169                          */
 170                         cmdline_memory_size = simple_strtoul(commands + 4,
 171                                                      &commands, 0);
 172                         if (*commands == 'K' || *commands == 'k') {
 173                                 cmdline_memory_size <<= 10;
 174                                 commands++;
 175                         } else if (*commands=='M' || *commands=='m') {
 176                                 cmdline_memory_size <<= 20;
 177                                 commands++;
 178                         }
 179                 }
 180                 while (*commands && *commands != ' ')
 181                         commands++;
 182         }
 183 }
 184
 185 /* This routine will in the future do all the nasty prom stuff
 186  * to probe for the mmu type and its parameters, etc. This will
 187  * also be where SMP things happen.
 188  */
 189
 190 extern void sun4c_probe_vac(void);
 191
 192 extern unsigned short root_flags;
 193 extern unsigned short root_dev;
 194 extern unsigned short ram_flags;
 195 #define RAMDISK_IMAGE_START_MASK        0x07FF
 196 #define RAMDISK_PROMPT_FLAG             0x8000
 197 #define RAMDISK_LOAD_FLAG               0x4000
 198
 199 extern int root_mountflags;
 200
 201 char reboot_command[COMMAND_LINE_SIZE];
 202
 203 enum sparc_cpu sparc_cpu_model;
 204 EXPORT_SYMBOL(sparc_cpu_model);
 205
 206 struct tt_entry *sparc_ttable;
 207
 208 struct pt_regs fake_swapper_regs;
 209
 210 void __init setup_arch(char **cmdline_p)
 211 {
 212         int i;
 213         unsigned long highest_paddr;
 214
 215         sparc_ttable = (struct tt_entry *) &trapbase;
 216
 217         /* Initialize PROM console and command line. */
 218         *cmdline_p = prom_getbootargs();
 219         strcpy(boot_command_line, *cmdline_p);
 220         parse_early_param();
 221
 222         boot_flags_init(*cmdline_p);
 223
 224         register_console(&prom_early_console);
 225
 226         /* Set sparc_cpu_model */
 227         sparc_cpu_model = sun_unknown;
 228         if (!strcmp(&cputypval[0], "sun4 "))
 229                 sparc_cpu_model = sun4;
 230         if (!strcmp(&cputypval[0], "sun4c"))
 231                 sparc_cpu_model = sun4c;
 232         if (!strcmp(&cputypval[0], "sun4m"))
 233                 sparc_cpu_model = sun4m;
 234         if (!strcmp(&cputypval[0], "sun4s"))
 235                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 236         if (!strcmp(&cputypval[0], "sun4d"))
 237                 sparc_cpu_model = sun4d;
 238         if (!strcmp(&cputypval[0], "sun4e"))
 239                 sparc_cpu_model = sun4e;
 240         if (!strcmp(&cputypval[0], "sun4u"))
 241                 sparc_cpu_model = sun4u;
 242         if (!strncmp(&cputypval[0], "leon" , 4))
 243                 sparc_cpu_model = sparc_leon;
 244
 245         printk("ARCH: ");
 246         switch(sparc_cpu_model) {
 247         case sun4:
 248                 printk("SUN4\n");
 249                 break;
 250         case sun4c:
 251                 printk("SUN4C\n");
 252                 break;
 253         case sun4m:
 254                 printk("SUN4M\n");
 255                 break;
 256         case sun4d:
 257                 printk("SUN4D\n");
 258                 break;
 259         case sun4e:
 260                 printk("SUN4E\n");
 261                 break;
 262         case sun4u:
 263                 printk("SUN4U\n");
 264                 break;
 265         case sparc_leon:
 266                 printk("LEON\n");
 267                 break;
 268         default:
 269                 printk("UNKNOWN!\n");
 270                 break;
 271         }
 272
 273 #ifdef CONFIG_DUMMY_CONSOLE
 274         conswitchp = &dummy_con;
 275 #endif
 276
 277         idprom_init();
 278         if (ARCH_SUN4C)
 279                 sun4c_probe_vac();
 280         load_mmu();
 281
 282         phys_base = 0xffffffffUL;
 283         highest_paddr = 0UL;
 284         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 285                 unsigned long top;
 286
 287                 if (sp_banks[i].base_addr < phys_base)
 288                         phys_base = sp_banks[i].base_addr;
 289                 top = sp_banks[i].base_addr +
 290                         sp_banks[i].num_bytes;
 291                 if (highest_paddr < top)
 292                         highest_paddr = top;
 293         }
 294         pfn_base = phys_base >> PAGE_SHIFT;
 295
 296         if (!root_flags)
 297                 root_mountflags &= ~MS_RDONLY;
 298         ROOT_DEV = old_decode_dev(root_dev);
 299 #ifdef CONFIG_BLK_DEV_RAM
 300         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 301         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 302         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 303 #endif
 304
 305         prom_setsync(prom_sync_me);
 306
 307         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 308            ((*(short *)linux_dbvec) != -1)) {
 309                 printk("Booted under KADB. Syncing trap table.\n");
 310                 (*(linux_dbvec->teach_debugger))();
 311         }
 312
 313         init_mm.context = (unsigned long) NO_CONTEXT;
 314         init_task.thread.kregs = &fake_swapper_regs;
 315
 316         paging_init();
 317
 318         smp_setup_cpu_possible_map();
 319 }
 320
 321 extern int stop_a_enabled;
 322
 323 void sun_do_break(void)
 324 {
 325         if (!stop_a_enabled)
 326                 return;
 327
 328         printk("\n");
 329         flush_user_windows();
 330
 331         prom_cmdline();
 332 }
 333 EXPORT_SYMBOL(sun_do_break);
 334
 335 int stop_a_enabled = 1;
 336
 337 static int __init topology_init(void)
 338 {
 339         int i, ncpus, err;
 340
 341         /* Count the number of physically present processors in
 342          * the machine, even on uniprocessor, so that /proc/cpuinfo
 343          * output is consistent with 2.4.x
 344          */
 345         ncpus = 0;
 346         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 347                 ncpus++;
 348         ncpus_probed = ncpus;
 349
 350         err = 0;
 351         for_each_online_cpu(i) {
 352                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 353                 if (!p)
 354                         err = -ENOMEM;
 355                 else
 356                         register_cpu(p, i);
 357         }
 358
 359         return err;
 360 }
 361
 362 subsys_initcall(topology_init);