arch/mips/lib/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <image.h>
  10 #include <asm/addrspace.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 #define LINUX_MAX_ENVS          256
  15 #define LINUX_MAX_ARGS          256
  16
  17 #if defined(CONFIG_MALTA)
  18 #define mips_boot_malta         1
  19 #else
  20 #define mips_boot_malta         0
  21 #endif
  22
  23 static int linux_argc;
  24 static char **linux_argv;
  25 static char *linux_argp;
  26
  27 static char **linux_env;
  28 static char *linux_env_p;
  29 static int linux_env_idx;
  30
  31 static ulong arch_get_sp(void)
  32 {
  33         ulong ret;
  34
  35         __asm__ __volatile__("move %0, $sp" : "=r"(ret) : );
  36
  37         return ret;
  38 }
  39
  40 void arch_lmb_reserve(struct lmb *lmb)
  41 {
  42         ulong sp;
  43
  44         sp = arch_get_sp();
  45         debug("## Current stack ends at 0x%08lx\n", sp);
  46
  47         /* adjust sp by 4K to be safe */
  48         sp -= 4096;
  49         lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp);
  50 }
  51
  52 static int boot_setup_linux(bootm_headers_t *images)
  53 {
  54         int ret;
  55         ulong rd_len;
  56
  57         rd_len = images->rd_end - images->rd_start;
  58         ret = boot_ramdisk_high(&images->lmb, images->rd_start,
  59                 rd_len, &images->initrd_start, &images->initrd_end);
  60         if (ret)
  61                 return ret;
  62
  63         return 0;
  64 }
  65
  66 static void linux_cmdline_init(void)
  67 {
  68         linux_argc = 1;
  69         linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params);
  70         linux_argv[0] = 0;
  71         linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS);
  72 }
  73
  74 static void linux_cmdline_set(const char *value, size_t len)
  75 {
  76         linux_argv[linux_argc] = linux_argp;
  77         memcpy(linux_argp, value, len);
  78         linux_argp[len] = 0;
  79
  80         linux_argp += len + 1;
  81         linux_argc++;
  82 }
  83
  84 static void linux_cmdline_dump(void)
  85 {
  86         int i;
  87
  88         debug("## cmdline argv at 0x%p, argp at 0x%p\n",
  89               linux_argv, linux_argp);
  90
  91         for (i = 1; i < linux_argc; i++)
  92                 debug("   arg %03d: %s\n", i, linux_argv[i]);
  93 }
  94
  95 static void boot_cmdline_linux(bootm_headers_t *images)
  96 {
  97         const char *bootargs, *next, *quote;
  98
  99         linux_cmdline_init();
 100
 101         bootargs = getenv("bootargs");
 102         if (!bootargs)
 103                 return;
 104
 105         next = bootargs;
 106
 107         while (bootargs && *bootargs && linux_argc < LINUX_MAX_ARGS) {
 108                 quote = strchr(bootargs, '"');
 109                 next = strchr(bootargs, ' ');
 110
 111                 while (next && quote && quote < next) {
 112                         /*
 113                          * we found a left quote before the next blank
 114                          * now we have to find the matching right quote
 115                          */
 116                         next = strchr(quote + 1, '"');
 117                         if (next) {
 118                                 quote = strchr(next + 1, '"');
 119                                 next = strchr(next + 1, ' ');
 120                         }
 121                 }
 122
 123                 if (!next)
 124                         next = bootargs + strlen(bootargs);
 125
 126                 linux_cmdline_set(bootargs, next - bootargs);
 127
 128                 if (*next)
 129                         next++;
 130
 131                 bootargs = next;
 132         }
 133
 134         linux_cmdline_dump();
 135 }
 136
 137 static void linux_env_init(void)
 138 {
 139         linux_env = (char **)(((ulong) linux_argp + 15) & ~15);
 140         linux_env[0] = 0;
 141         linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
 142         linux_env_idx = 0;
 143 }
 144
 145 static void linux_env_set(const char *env_name, const char *env_val)
 146 {
 147         if (linux_env_idx < LINUX_MAX_ENVS - 1) {
 148                 linux_env[linux_env_idx] = linux_env_p;
 149
 150                 strcpy(linux_env_p, env_name);
 151                 linux_env_p += strlen(env_name);
 152
 153                 if (mips_boot_malta) {
 154                         linux_env_p++;
 155                         linux_env[++linux_env_idx] = linux_env_p;
 156                 } else {
 157                         *linux_env_p++ = '=';
 158                 }
 159
 160                 strcpy(linux_env_p, env_val);
 161                 linux_env_p += strlen(env_val);
 162
 163                 linux_env_p++;
 164                 linux_env[++linux_env_idx] = 0;
 165         }
 166 }
 167
 168 static void boot_prep_linux(bootm_headers_t *images)
 169 {
 170         char env_buf[12];
 171         const char *cp;
 172         ulong rd_start, rd_size;
 173
 174 #ifdef CONFIG_MEMSIZE_IN_BYTES
 175         sprintf(env_buf, "%lu", (ulong)gd->ram_size);
 176         debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
 177 #else
 178         sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
 179         debug("## Giving linux memsize in MB, %lu\n",
 180               (ulong)(gd->ram_size >> 20));
 181 #endif /* CONFIG_MEMSIZE_IN_BYTES */
 182
 183         rd_start = UNCACHED_SDRAM(images->initrd_start);
 184         rd_size = images->initrd_end - images->initrd_start;
 185
 186         linux_env_init();
 187
 188         linux_env_set("memsize", env_buf);
 189
 190         sprintf(env_buf, "0x%08lX", rd_start);
 191         linux_env_set("initrd_start", env_buf);
 192
 193         sprintf(env_buf, "0x%lX", rd_size);
 194         linux_env_set("initrd_size", env_buf);
 195
 196         sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
 197         linux_env_set("flash_start", env_buf);
 198
 199         sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
 200         linux_env_set("flash_size", env_buf);
 201
 202         cp = getenv("ethaddr");
 203         if (cp)
 204                 linux_env_set("ethaddr", cp);
 205
 206         cp = getenv("eth1addr");
 207         if (cp)
 208                 linux_env_set("eth1addr", cp);
 209
 210         if (mips_boot_malta) {
 211                 sprintf(env_buf, "%un8r", gd->baudrate);
 212                 linux_env_set("modetty0", env_buf);
 213         }
 214 }
 215
 216 static void boot_jump_linux(bootm_headers_t *images)
 217 {
 218         typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
 219         kernel_entry_t kernel = (kernel_entry_t) images->ep;
 220         ulong linux_extra = 0;
 221
 222         debug("## Transferring control to Linux (at address %p) ...\n", kernel);
 223
 224         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 225
 226         if (mips_boot_malta)
 227                 linux_extra = gd->ram_size;
 228
 229         /* we assume that the kernel is in place */
 230         printf("\nStarting kernel ...\n\n");
 231
 232         kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, linux_extra);
 233 }
 234
 235 int do_bootm_linux(int flag, int argc, char * const argv[],
 236                         bootm_headers_t *images)
 237 {
 238         int ret;
 239
 240         /* No need for those on MIPS */
 241         if (flag & BOOTM_STATE_OS_BD_T)
 242                 return -1;
 243
 244         if (flag & BOOTM_STATE_OS_CMDLINE) {
 245                 boot_cmdline_linux(images);
 246                 return 0;
 247         }
 248
 249         if (flag & BOOTM_STATE_OS_PREP) {
 250                 boot_prep_linux(images);
 251                 return 0;
 252         }
 253
 254         if (flag & BOOTM_STATE_OS_GO) {
 255                 boot_jump_linux(images);
 256                 return 0;
 257         }
 258
 259         ret = boot_setup_linux(images);
 260         if (ret)
 261                 return ret;
 262
 263         boot_cmdline_linux(images);
 264         boot_prep_linux(images);
 265         boot_jump_linux(images);
 266
 267         /* does not return */
 268         return 1;
 269 }