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