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/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 #include <linux/start_kernel.h>
  36 #include <uapi/linux/mount.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/processor.h>
  40 #include <asm/oplib.h>
  41 #include <asm/page.h>
  42 #include <asm/traps.h>
  43 #include <asm/vaddrs.h>
  44 #include <asm/mbus.h>
  45 #include <asm/idprom.h>
  46 #include <asm/cpudata.h>
  47 #include <asm/setup.h>
  48 #include <asm/cacheflush.h>
  49 #include <asm/sections.h>
  50
  51 #include "kernel.h"
  52
  53 /* Typing sync at the prom prompt calls the function pointed to by
  54  * romvec->pv_synchook which I set to the following function.
  55  * This should sync all filesystems and return, for now it just
  56  * prints out pretty messages and returns.
  57  */
  58
  59 /* Pretty sick eh? */
  60 static void prom_sync_me(void)
  61 {
  62         unsigned long prom_tbr, flags;
  63
  64         /* XXX Badly broken. FIX! - Anton */
  65         local_irq_save(flags);
  66         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  67         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  68                              "nop\n\t"
  69                              "nop\n\t"
  70                              "nop\n\t" : : "r" (&trapbase));
  71
  72         prom_printf("PROM SYNC COMMAND...\n");
  73         show_mem();
  74         if (!is_idle_task(current)) {
  75                 local_irq_enable();
  76                 ksys_sync();
  77                 local_irq_disable();
  78         }
  79         prom_printf("Returning to prom\n");
  80
  81         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  82                              "nop\n\t"
  83                              "nop\n\t"
  84                              "nop\n\t" : : "r" (prom_tbr));
  85         local_irq_restore(flags);
  86 }
  87
  88 static unsigned int boot_flags __initdata = 0;
  89 #define BOOTME_DEBUG  0x1
  90
  91 /* Exported for mm/init.c:paging_init. */
  92 unsigned long cmdline_memory_size __initdata = 0;
  93
  94 /* which CPU booted us (0xff = not set) */
  95 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
  96
  97 static void
  98 prom_console_write(struct console *con, const char *s, unsigned int n)
  99 {
 100         prom_write(s, n);
 101 }
 102
 103 static struct console prom_early_console = {
 104         .name =         "earlyprom",
 105         .write =        prom_console_write,
 106         .flags =        CON_PRINTBUFFER | CON_BOOT,
 107         .index =        -1,
 108 };
 109
 110 /*
 111  * Process kernel command line switches that are specific to the
 112  * SPARC or that require special low-level processing.
 113  */
 114 static void __init process_switch(char c)
 115 {
 116         switch (c) {
 117         case 'd':
 118                 boot_flags |= BOOTME_DEBUG;
 119                 break;
 120         case 's':
 121                 break;
 122         case 'h':
 123                 prom_printf("boot_flags_init: Halt!\n");
 124                 prom_halt();
 125                 break;
 126         case 'p':
 127                 prom_early_console.flags &= ~CON_BOOT;
 128                 break;
 129         default:
 130                 printk("Unknown boot switch (-%c)\n", c);
 131                 break;
 132         }
 133 }
 134
 135 static void __init boot_flags_init(char *commands)
 136 {
 137         while (*commands) {
 138                 /* Move to the start of the next "argument". */
 139                 while (*commands == ' ')
 140                         commands++;
 141
 142                 /* Process any command switches, otherwise skip it. */
 143                 if (*commands == '\0')
 144                         break;
 145                 if (*commands == '-') {
 146                         commands++;
 147                         while (*commands && *commands != ' ')
 148                                 process_switch(*commands++);
 149                         continue;
 150                 }
 151                 if (!strncmp(commands, "mem=", 4)) {
 152                         /*
 153                          * "mem=XXX[kKmM] overrides the PROM-reported
 154                          * memory size.
 155                          */
 156                         cmdline_memory_size = simple_strtoul(commands + 4,
 157                                                      &commands, 0);
 158                         if (*commands == 'K' || *commands == 'k') {
 159                                 cmdline_memory_size <<= 10;
 160                                 commands++;
 161                         } else if (*commands=='M' || *commands=='m') {
 162                                 cmdline_memory_size <<= 20;
 163                                 commands++;
 164                         }
 165                 }
 166                 while (*commands && *commands != ' ')
 167                         commands++;
 168         }
 169 }
 170
 171 extern unsigned short root_flags;
 172 extern unsigned short root_dev;
 173 extern unsigned short ram_flags;
 174 #define RAMDISK_IMAGE_START_MASK        0x07FF
 175 #define RAMDISK_PROMPT_FLAG             0x8000
 176 #define RAMDISK_LOAD_FLAG               0x4000
 177
 178 extern int root_mountflags;
 179
 180 char reboot_command[COMMAND_LINE_SIZE];
 181
 182 struct cpuid_patch_entry {
 183         unsigned int    addr;
 184         unsigned int    sun4d[3];
 185         unsigned int    leon[3];
 186 };
 187 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
 188
 189 static void __init per_cpu_patch(void)
 190 {
 191         struct cpuid_patch_entry *p;
 192
 193         if (sparc_cpu_model == sun4m) {
 194                 /* Nothing to do, this is what the unpatched code
 195                  * targets.
 196                  */
 197                 return;
 198         }
 199
 200         p = &__cpuid_patch;
 201         while (p < &__cpuid_patch_end) {
 202                 unsigned long addr = p->addr;
 203                 unsigned int *insns;
 204
 205                 switch (sparc_cpu_model) {
 206                 case sun4d:
 207                         insns = &p->sun4d[0];
 208                         break;
 209
 210                 case sparc_leon:
 211                         insns = &p->leon[0];
 212                         break;
 213                 default:
 214                         prom_printf("Unknown cpu type, halting.\n");
 215                         prom_halt();
 216                 }
 217                 *(unsigned int *) (addr + 0) = insns[0];
 218                 flushi(addr + 0);
 219                 *(unsigned int *) (addr + 4) = insns[1];
 220                 flushi(addr + 4);
 221                 *(unsigned int *) (addr + 8) = insns[2];
 222                 flushi(addr + 8);
 223
 224                 p++;
 225         }
 226 }
 227
 228 struct leon_1insn_patch_entry {
 229         unsigned int addr;
 230         unsigned int insn;
 231 };
 232
 233 enum sparc_cpu sparc_cpu_model;
 234 EXPORT_SYMBOL(sparc_cpu_model);
 235
 236 static __init void leon_patch(void)
 237 {
 238         struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
 239         struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
 240
 241         /* Default instruction is leon - no patching */
 242         if (sparc_cpu_model == sparc_leon)
 243                 return;
 244
 245         while (start < end) {
 246                 unsigned long addr = start->addr;
 247
 248                 *(unsigned int *)(addr) = start->insn;
 249                 flushi(addr);
 250
 251                 start++;
 252         }
 253 }
 254
 255 struct tt_entry *sparc_ttable;
 256
 257 /* Called from head_32.S - before we have setup anything
 258  * in the kernel. Be very careful with what you do here.
 259  */
 260 void __init sparc32_start_kernel(struct linux_romvec *rp)
 261 {
 262         prom_init(rp);
 263
 264         /* Set sparc_cpu_model */
 265         sparc_cpu_model = sun_unknown;
 266         if (!strcmp(&cputypval[0], "sun4m"))
 267                 sparc_cpu_model = sun4m;
 268         if (!strcmp(&cputypval[0], "sun4s"))
 269                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 270         if (!strcmp(&cputypval[0], "sun4d"))
 271                 sparc_cpu_model = sun4d;
 272         if (!strcmp(&cputypval[0], "sun4e"))
 273                 sparc_cpu_model = sun4e;
 274         if (!strcmp(&cputypval[0], "sun4u"))
 275                 sparc_cpu_model = sun4u;
 276         if (!strncmp(&cputypval[0], "leon" , 4))
 277                 sparc_cpu_model = sparc_leon;
 278
 279         leon_patch();
 280         start_kernel();
 281 }
 282
 283 void __init setup_arch(char **cmdline_p)
 284 {
 285         int i;
 286         unsigned long highest_paddr;
 287
 288         sparc_ttable = &trapbase;
 289
 290         /* Initialize PROM console and command line. */
 291         *cmdline_p = prom_getbootargs();
 292         strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 293         parse_early_param();
 294
 295         boot_flags_init(*cmdline_p);
 296
 297         register_console(&prom_early_console);
 298
 299         switch(sparc_cpu_model) {
 300         case sun4m:
 301                 pr_info("ARCH: SUN4M\n");
 302                 break;
 303         case sun4d:
 304                 pr_info("ARCH: SUN4D\n");
 305                 break;
 306         case sun4e:
 307                 pr_info("ARCH: SUN4E\n");
 308                 break;
 309         case sun4u:
 310                 pr_info("ARCH: SUN4U\n");
 311                 break;
 312         case sparc_leon:
 313                 pr_info("ARCH: LEON\n");
 314                 break;
 315         default:
 316                 pr_info("ARCH: UNKNOWN!\n");
 317                 break;
 318         }
 319
 320         idprom_init();
 321         load_mmu();
 322
 323         phys_base = 0xffffffffUL;
 324         highest_paddr = 0UL;
 325         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 326                 unsigned long top;
 327
 328                 if (sp_banks[i].base_addr < phys_base)
 329                         phys_base = sp_banks[i].base_addr;
 330                 top = sp_banks[i].base_addr +
 331                         sp_banks[i].num_bytes;
 332                 if (highest_paddr < top)
 333                         highest_paddr = top;
 334         }
 335         pfn_base = phys_base >> PAGE_SHIFT;
 336
 337         if (!root_flags)
 338                 root_mountflags &= ~MS_RDONLY;
 339         ROOT_DEV = old_decode_dev(root_dev);
 340 #ifdef CONFIG_BLK_DEV_RAM
 341         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 342 #endif
 343
 344         prom_setsync(prom_sync_me);
 345
 346         if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
 347            ((*(short *)linux_dbvec) != -1)) {
 348                 printk("Booted under KADB. Syncing trap table.\n");
 349                 (*(linux_dbvec->teach_debugger))();
 350         }
 351
 352         /* Run-time patch instructions to match the cpu model */
 353         per_cpu_patch();
 354
 355         paging_init();
 356
 357         smp_setup_cpu_possible_map();
 358 }
 359
 360 extern int stop_a_enabled;
 361
 362 void sun_do_break(void)
 363 {
 364         if (!stop_a_enabled)
 365                 return;
 366
 367         printk("\n");
 368         flush_user_windows();
 369
 370         prom_cmdline();
 371 }
 372 EXPORT_SYMBOL(sun_do_break);
 373
 374 int stop_a_enabled = 1;
 375
 376 static int __init topology_init(void)
 377 {
 378         int i, ncpus, err;
 379
 380         /* Count the number of physically present processors in
 381          * the machine, even on uniprocessor, so that /proc/cpuinfo
 382          * output is consistent with 2.4.x
 383          */
 384         ncpus = 0;
 385         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 386                 ncpus++;
 387         ncpus_probed = ncpus;
 388
 389         err = 0;
 390         for_each_online_cpu(i) {
 391                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 392                 if (!p)
 393                         err = -ENOMEM;
 394                 else
 395                         register_cpu(p, i);
 396         }
 397
 398         return err;
 399 }
 400
 401 subsys_initcall(topology_init);
 402
 403 #if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP)
 404 void __init arch_cpu_finalize_init(void)
 405 {
 406         cpu_data(0).udelay_val = loops_per_jiffy;
 407 }
 408 #endif