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();
  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 static void
 107 prom_console_write(struct console *con, const char *s, unsigned n)
 108 {
 109         prom_write(s, n);
 110 }
 111
 112 static struct console prom_early_console = {
 113         .name =         "earlyprom",
 114         .write =        prom_console_write,
 115         .flags =        CON_PRINTBUFFER | CON_BOOT,
 116         .index =        -1,
 117 };
 118
 119 /*
 120  * Process kernel command line switches that are specific to the
 121  * SPARC or that require special low-level processing.
 122  */
 123 static void __init process_switch(char c)
 124 {
 125         switch (c) {
 126         case 'd':
 127                 boot_flags |= BOOTME_DEBUG;
 128                 break;
 129         case 's':
 130                 break;
 131         case 'h':
 132                 prom_printf("boot_flags_init: Halt!\n");
 133                 prom_halt();
 134                 break;
 135         case 'p':
 136                 /* Just ignore, this behavior is now the default.  */
 137                 break;
 138         default:
 139                 printk("Unknown boot switch (-%c)\n", c);
 140                 break;
 141         }
 142 }
 143
 144 static void __init boot_flags_init(char *commands)
 145 {
 146         while (*commands) {
 147                 /* Move to the start of the next "argument". */
 148                 while (*commands && *commands == ' ')
 149                         commands++;
 150
 151                 /* Process any command switches, otherwise skip it. */
 152                 if (*commands == '\0')
 153                         break;
 154                 if (*commands == '-') {
 155                         commands++;
 156                         while (*commands && *commands != ' ')
 157                                 process_switch(*commands++);
 158                         continue;
 159                 }
 160                 if (!strncmp(commands, "mem=", 4)) {
 161                         /*
 162                          * "mem=XXX[kKmM] overrides the PROM-reported
 163                          * memory size.
 164                          */
 165                         cmdline_memory_size = simple_strtoul(commands + 4,
 166                                                      &commands, 0);
 167                         if (*commands == 'K' || *commands == 'k') {
 168                                 cmdline_memory_size <<= 10;
 169                                 commands++;
 170                         } else if (*commands=='M' || *commands=='m') {
 171                                 cmdline_memory_size <<= 20;
 172                                 commands++;
 173                         }
 174                 }
 175                 while (*commands && *commands != ' ')
 176                         commands++;
 177         }
 178 }
 179
 180 /* This routine will in the future do all the nasty prom stuff
 181  * to probe for the mmu type and its parameters, etc. This will
 182  * also be where SMP things happen.
 183  */
 184
 185 extern void sun4c_probe_vac(void);
 186
 187 extern unsigned short root_flags;
 188 extern unsigned short root_dev;
 189 extern unsigned short ram_flags;
 190 #define RAMDISK_IMAGE_START_MASK        0x07FF
 191 #define RAMDISK_PROMPT_FLAG             0x8000
 192 #define RAMDISK_LOAD_FLAG               0x4000
 193
 194 extern int root_mountflags;
 195
 196 char reboot_command[COMMAND_LINE_SIZE];
 197
 198 enum sparc_cpu sparc_cpu_model;
 199 EXPORT_SYMBOL(sparc_cpu_model);
 200
 201 struct tt_entry *sparc_ttable;
 202
 203 struct pt_regs fake_swapper_regs;
 204
 205 void __init setup_arch(char **cmdline_p)
 206 {
 207         int i;
 208         unsigned long highest_paddr;
 209
 210         sparc_ttable = (struct tt_entry *) &trapbase;
 211
 212         /* Initialize PROM console and command line. */
 213         *cmdline_p = prom_getbootargs();
 214         strcpy(boot_command_line, *cmdline_p);
 215         parse_early_param();
 216
 217         boot_flags_init(*cmdline_p);
 218
 219         register_console(&prom_early_console);
 220
 221         /* Set sparc_cpu_model */
 222         sparc_cpu_model = sun_unknown;
 223         if (!strcmp(&cputypval[0], "sun4 "))
 224                 sparc_cpu_model = sun4;
 225         if (!strcmp(&cputypval[0], "sun4c"))
 226                 sparc_cpu_model = sun4c;
 227         if (!strcmp(&cputypval[0], "sun4m"))
 228                 sparc_cpu_model = sun4m;
 229         if (!strcmp(&cputypval[0], "sun4s"))
 230                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 231         if (!strcmp(&cputypval[0], "sun4d"))
 232                 sparc_cpu_model = sun4d;
 233         if (!strcmp(&cputypval[0], "sun4e"))
 234                 sparc_cpu_model = sun4e;
 235         if (!strcmp(&cputypval[0], "sun4u"))
 236                 sparc_cpu_model = sun4u;
 237         if (!strncmp(&cputypval[0], "leon" , 4))
 238                 sparc_cpu_model = sparc_leon;
 239
 240         printk("ARCH: ");
 241         switch(sparc_cpu_model) {
 242         case sun4:
 243                 printk("SUN4\n");
 244                 break;
 245         case sun4c:
 246                 printk("SUN4C\n");
 247                 break;
 248         case sun4m:
 249                 printk("SUN4M\n");
 250                 break;
 251         case sun4d:
 252                 printk("SUN4D\n");
 253                 break;
 254         case sun4e:
 255                 printk("SUN4E\n");
 256                 break;
 257         case sun4u:
 258                 printk("SUN4U\n");
 259                 break;
 260         case sparc_leon:
 261                 printk("LEON\n");
 262                 break;
 263         default:
 264                 printk("UNKNOWN!\n");
 265                 break;
 266         };
 267
 268 #ifdef CONFIG_DUMMY_CONSOLE
 269         conswitchp = &dummy_con;
 270 #endif
 271
 272         idprom_init();
 273         if (ARCH_SUN4C)
 274                 sun4c_probe_vac();
 275         load_mmu();
 276
 277         phys_base = 0xffffffffUL;
 278         highest_paddr = 0UL;
 279         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 280                 unsigned long top;
 281
 282                 if (sp_banks[i].base_addr < phys_base)
 283                         phys_base = sp_banks[i].base_addr;
 284                 top = sp_banks[i].base_addr +
 285                         sp_banks[i].num_bytes;
 286                 if (highest_paddr < top)
 287                         highest_paddr = top;
 288         }
 289         pfn_base = phys_base >> PAGE_SHIFT;
 290
 291         if (!root_flags)
 292                 root_mountflags &= ~MS_RDONLY;
 293         ROOT_DEV = old_decode_dev(root_dev);
 294 #ifdef CONFIG_BLK_DEV_RAM
 295         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 296         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 297         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 298 #endif
 299
 300         prom_setsync(prom_sync_me);
 301
 302         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 303            ((*(short *)linux_dbvec) != -1)) {
 304                 printk("Booted under KADB. Syncing trap table.\n");
 305                 (*(linux_dbvec->teach_debugger))();
 306         }
 307
 308         init_mm.context = (unsigned long) NO_CONTEXT;
 309         init_task.thread.kregs = &fake_swapper_regs;
 310
 311         paging_init();
 312
 313         smp_setup_cpu_possible_map();
 314 }
 315
 316 extern int stop_a_enabled;
 317
 318 void sun_do_break(void)
 319 {
 320         if (!stop_a_enabled)
 321                 return;
 322
 323         printk("\n");
 324         flush_user_windows();
 325
 326         prom_cmdline();
 327 }
 328 EXPORT_SYMBOL(sun_do_break);
 329
 330 int stop_a_enabled = 1;
 331
 332 static int __init topology_init(void)
 333 {
 334         int i, ncpus, err;
 335
 336         /* Count the number of physically present processors in
 337          * the machine, even on uniprocessor, so that /proc/cpuinfo
 338          * output is consistent with 2.4.x
 339          */
 340         ncpus = 0;
 341         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 342                 ncpus++;
 343         ncpus_probed = ncpus;
 344
 345         err = 0;
 346         for_each_online_cpu(i) {
 347                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 348                 if (!p)
 349                         err = -ENOMEM;
 350                 else
 351                         register_cpu(p, i);
 352         }
 353
 354         return err;
 355 }
 356
 357 subsys_initcall(topology_init);