arch/sparc/kernel/setup_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/sparc/kernel/setup.c
   4  *
   5  *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
   6  *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/stddef.h>
  14 #include <linux/unistd.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/slab.h>
  17 #include <linux/initrd.h>
  18 #include <asm/smp.h>
  19 #include <linux/user.h>
  20 #include <linux/screen_info.h>
  21 #include <linux/delay.h>
  22 #include <linux/fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/major.h>
  27 #include <linux/string.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/console.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/root_dev.h>
  33 #include <linux/cpu.h>
  34 #include <linux/kdebug.h>
  35 #include <linux/export.h>
  36 #include <linux/start_kernel.h>
  37 #include <uapi/linux/mount.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/processor.h>
  41 #include <asm/oplib.h>
  42 #include <asm/page.h>
  43 #include <asm/traps.h>
  44 #include <asm/vaddrs.h>
  45 #include <asm/mbus.h>
  46 #include <asm/idprom.h>
  47 #include <asm/cpudata.h>
  48 #include <asm/setup.h>
  49 #include <asm/cacheflush.h>
  50 #include <asm/sections.h>
  51
  52 #include "kernel.h"
  53
  54 struct screen_info screen_info = {
  55         0, 0,                   /* orig-x, orig-y */
  56         0,                      /* unused */
  57         0,                      /* orig-video-page */
  58         0,                      /* orig-video-mode */
  59         128,                    /* orig-video-cols */
  60         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  61         54,                     /* orig-video-lines */
  62         0,                      /* orig-video-isVGA */
  63         16                      /* orig-video-points */
  64 };
  65
  66 /* Typing sync at the prom prompt calls the function pointed to by
  67  * romvec->pv_synchook which I set to the following function.
  68  * This should sync all filesystems and return, for now it just
  69  * prints out pretty messages and returns.
  70  */
  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, NULL);
  87         if (!is_idle_task(current)) {
  88                 local_irq_enable();
  89                 ksys_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
 110 static void
 111 prom_console_write(struct console *con, const char *s, unsigned int 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                 prom_early_console.flags &= ~CON_BOOT;
 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 == ' ')
 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 extern unsigned short root_flags;
 185 extern unsigned short root_dev;
 186 extern unsigned short ram_flags;
 187 #define RAMDISK_IMAGE_START_MASK        0x07FF
 188 #define RAMDISK_PROMPT_FLAG             0x8000
 189 #define RAMDISK_LOAD_FLAG               0x4000
 190
 191 extern int root_mountflags;
 192
 193 char reboot_command[COMMAND_LINE_SIZE];
 194
 195 struct cpuid_patch_entry {
 196         unsigned int    addr;
 197         unsigned int    sun4d[3];
 198         unsigned int    leon[3];
 199 };
 200 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
 201
 202 static void __init per_cpu_patch(void)
 203 {
 204         struct cpuid_patch_entry *p;
 205
 206         if (sparc_cpu_model == sun4m) {
 207                 /* Nothing to do, this is what the unpatched code
 208                  * targets.
 209                  */
 210                 return;
 211         }
 212
 213         p = &__cpuid_patch;
 214         while (p < &__cpuid_patch_end) {
 215                 unsigned long addr = p->addr;
 216                 unsigned int *insns;
 217
 218                 switch (sparc_cpu_model) {
 219                 case sun4d:
 220                         insns = &p->sun4d[0];
 221                         break;
 222
 223                 case sparc_leon:
 224                         insns = &p->leon[0];
 225                         break;
 226                 default:
 227                         prom_printf("Unknown cpu type, halting.\n");
 228                         prom_halt();
 229                 }
 230                 *(unsigned int *) (addr + 0) = insns[0];
 231                 flushi(addr + 0);
 232                 *(unsigned int *) (addr + 4) = insns[1];
 233                 flushi(addr + 4);
 234                 *(unsigned int *) (addr + 8) = insns[2];
 235                 flushi(addr + 8);
 236
 237                 p++;
 238         }
 239 }
 240
 241 struct leon_1insn_patch_entry {
 242         unsigned int addr;
 243         unsigned int insn;
 244 };
 245
 246 enum sparc_cpu sparc_cpu_model;
 247 EXPORT_SYMBOL(sparc_cpu_model);
 248
 249 static __init void leon_patch(void)
 250 {
 251         struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
 252         struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
 253
 254         /* Default instruction is leon - no patching */
 255         if (sparc_cpu_model == sparc_leon)
 256                 return;
 257
 258         while (start < end) {
 259                 unsigned long addr = start->addr;
 260
 261                 *(unsigned int *)(addr) = start->insn;
 262                 flushi(addr);
 263
 264                 start++;
 265         }
 266 }
 267
 268 struct tt_entry *sparc_ttable;
 269 static struct pt_regs fake_swapper_regs;
 270
 271 /* Called from head_32.S - before we have setup anything
 272  * in the kernel. Be very careful with what you do here.
 273  */
 274 void __init sparc32_start_kernel(struct linux_romvec *rp)
 275 {
 276         prom_init(rp);
 277
 278         /* Set sparc_cpu_model */
 279         sparc_cpu_model = sun_unknown;
 280         if (!strcmp(&cputypval[0], "sun4m"))
 281                 sparc_cpu_model = sun4m;
 282         if (!strcmp(&cputypval[0], "sun4s"))
 283                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 284         if (!strcmp(&cputypval[0], "sun4d"))
 285                 sparc_cpu_model = sun4d;
 286         if (!strcmp(&cputypval[0], "sun4e"))
 287                 sparc_cpu_model = sun4e;
 288         if (!strcmp(&cputypval[0], "sun4u"))
 289                 sparc_cpu_model = sun4u;
 290         if (!strncmp(&cputypval[0], "leon" , 4))
 291                 sparc_cpu_model = sparc_leon;
 292
 293         leon_patch();
 294         start_kernel();
 295 }
 296
 297 void __init setup_arch(char **cmdline_p)
 298 {
 299         int i;
 300         unsigned long highest_paddr;
 301
 302         sparc_ttable = &trapbase;
 303
 304         /* Initialize PROM console and command line. */
 305         *cmdline_p = prom_getbootargs();
 306         strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 307         parse_early_param();
 308
 309         boot_flags_init(*cmdline_p);
 310
 311         register_console(&prom_early_console);
 312
 313         switch(sparc_cpu_model) {
 314         case sun4m:
 315                 pr_info("ARCH: SUN4M\n");
 316                 break;
 317         case sun4d:
 318                 pr_info("ARCH: SUN4D\n");
 319                 break;
 320         case sun4e:
 321                 pr_info("ARCH: SUN4E\n");
 322                 break;
 323         case sun4u:
 324                 pr_info("ARCH: SUN4U\n");
 325                 break;
 326         case sparc_leon:
 327                 pr_info("ARCH: LEON\n");
 328                 break;
 329         default:
 330                 pr_info("ARCH: UNKNOWN!\n");
 331                 break;
 332         }
 333
 334         idprom_init();
 335         load_mmu();
 336
 337         phys_base = 0xffffffffUL;
 338         highest_paddr = 0UL;
 339         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 340                 unsigned long top;
 341
 342                 if (sp_banks[i].base_addr < phys_base)
 343                         phys_base = sp_banks[i].base_addr;
 344                 top = sp_banks[i].base_addr +
 345                         sp_banks[i].num_bytes;
 346                 if (highest_paddr < top)
 347                         highest_paddr = top;
 348         }
 349         pfn_base = phys_base >> PAGE_SHIFT;
 350
 351         if (!root_flags)
 352                 root_mountflags &= ~MS_RDONLY;
 353         ROOT_DEV = old_decode_dev(root_dev);
 354 #ifdef CONFIG_BLK_DEV_RAM
 355         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 356 #endif
 357
 358         prom_setsync(prom_sync_me);
 359
 360         if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
 361            ((*(short *)linux_dbvec) != -1)) {
 362                 printk("Booted under KADB. Syncing trap table.\n");
 363                 (*(linux_dbvec->teach_debugger))();
 364         }
 365
 366         init_task.thread.kregs = &fake_swapper_regs;
 367
 368         /* Run-time patch instructions to match the cpu model */
 369         per_cpu_patch();
 370
 371         paging_init();
 372
 373         smp_setup_cpu_possible_map();
 374 }
 375
 376 extern int stop_a_enabled;
 377
 378 void sun_do_break(void)
 379 {
 380         if (!stop_a_enabled)
 381                 return;
 382
 383         printk("\n");
 384         flush_user_windows();
 385
 386         prom_cmdline();
 387 }
 388 EXPORT_SYMBOL(sun_do_break);
 389
 390 int stop_a_enabled = 1;
 391
 392 static int __init topology_init(void)
 393 {
 394         int i, ncpus, err;
 395
 396         /* Count the number of physically present processors in
 397          * the machine, even on uniprocessor, so that /proc/cpuinfo
 398          * output is consistent with 2.4.x
 399          */
 400         ncpus = 0;
 401         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 402                 ncpus++;
 403         ncpus_probed = ncpus;
 404
 405         err = 0;
 406         for_each_online_cpu(i) {
 407                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 408                 if (!p)
 409                         err = -ENOMEM;
 410                 else
 411                         register_cpu(p, i);
 412         }
 413
 414         return err;
 415 }
 416
 417 subsys_initcall(topology_init);