arch/powerpc/lib/bootm.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2006
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10
  11 #include <common.h>
  12 #include <watchdog.h>
  13 #include <command.h>
  14 #include <image.h>
  15 #include <malloc.h>
  16 #include <u-boot/zlib.h>
  17 #include <bzlib.h>
  18 #include <environment.h>
  19 #include <asm/byteorder.h>
  20 #include <asm/mp.h>
  21 #include <bootm.h>
  22 #include <vxworks.h>
  23
  24 #if defined(CONFIG_OF_LIBFDT)
  25 #include <libfdt.h>
  26 #include <fdt_support.h>
  27 #endif
  28
  29 #ifdef CONFIG_SYS_INIT_RAM_LOCK
  30 #include <asm/cache.h>
  31 #endif
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 static ulong get_sp (void);
  36 extern void ft_fixup_num_cores(void *blob);
  37 static void set_clocks_in_mhz (bd_t *kbd);
  38
  39 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  40 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  41 #endif
  42
  43 static void boot_jump_linux(bootm_headers_t *images)
  44 {
  45         void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
  46                           ulong r7, ulong r8, ulong r9);
  47 #ifdef CONFIG_OF_LIBFDT
  48         char *of_flat_tree = images->ft_addr;
  49 #endif
  50
  51         kernel = (void (*)(bd_t *, ulong, ulong, ulong,
  52                            ulong, ulong, ulong))images->ep;
  53         debug ("## Transferring control to Linux (at address %08lx) ...\n",
  54                 (ulong)kernel);
  55
  56         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  57
  58 #ifdef CONFIG_BOOTSTAGE_FDT
  59         bootstage_fdt_add_report();
  60 #endif
  61 #ifdef CONFIG_BOOTSTAGE_REPORT
  62         bootstage_report();
  63 #endif
  64
  65 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  66         unlock_ram_in_cache();
  67 #endif
  68
  69 #if defined(CONFIG_OF_LIBFDT)
  70         if (of_flat_tree) {     /* device tree; boot new style */
  71                 /*
  72                  * Linux Kernel Parameters (passing device tree):
  73                  *   r3: pointer to the fdt
  74                  *   r4: 0
  75                  *   r5: 0
  76                  *   r6: epapr magic
  77                  *   r7: size of IMA in bytes
  78                  *   r8: 0
  79                  *   r9: 0
  80                  */
  81                 debug ("   Booting using OF flat tree...\n");
  82                 WATCHDOG_RESET ();
  83                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  84                            env_get_bootm_mapsize(), 0, 0);
  85                 /* does not return */
  86         } else
  87 #endif
  88         {
  89                 /*
  90                  * Linux Kernel Parameters (passing board info data):
  91                  *   r3: ptr to board info data
  92                  *   r4: initrd_start or 0 if no initrd
  93                  *   r5: initrd_end - unused if r4 is 0
  94                  *   r6: Start of command line string
  95                  *   r7: End   of command line string
  96                  *   r8: 0
  97                  *   r9: 0
  98                  */
  99                 ulong cmd_start = images->cmdline_start;
 100                 ulong cmd_end = images->cmdline_end;
 101                 ulong initrd_start = images->initrd_start;
 102                 ulong initrd_end = images->initrd_end;
 103                 bd_t *kbd = images->kbd;
 104
 105                 debug ("   Booting using board info...\n");
 106                 WATCHDOG_RESET ();
 107                 (*kernel) (kbd, initrd_start, initrd_end,
 108                            cmd_start, cmd_end, 0, 0);
 109                 /* does not return */
 110         }
 111         return ;
 112 }
 113
 114 void arch_lmb_reserve(struct lmb *lmb)
 115 {
 116         phys_size_t bootm_size;
 117         ulong size, sp, bootmap_base;
 118
 119         bootmap_base = env_get_bootm_low();
 120         bootm_size = env_get_bootm_size();
 121
 122 #ifdef DEBUG
 123         if (((u64)bootmap_base + bootm_size) >
 124             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 125                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 126         if ((bootmap_base + bootm_size) > get_effective_memsize())
 127                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 128 #endif
 129
 130         size = min(bootm_size, get_effective_memsize());
 131         size = min(size, (ulong)CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 132
 133         if (size < bootm_size) {
 134                 ulong base = bootmap_base + size;
 135                 printf("WARNING: adjusting available memory to %lx\n", size);
 136                 lmb_reserve(lmb, base, bootm_size - size);
 137         }
 138
 139         /*
 140          * Booting a (Linux) kernel image
 141          *
 142          * Allocate space for command line and board info - the
 143          * address should be as high as possible within the reach of
 144          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 145          * memory, which means far enough below the current stack
 146          * pointer.
 147          */
 148         sp = get_sp();
 149         debug ("## Current stack ends at 0x%08lx\n", sp);
 150
 151         /* adjust sp by 4K to be safe */
 152         sp -= 4096;
 153         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 154
 155 #ifdef CONFIG_MP
 156         cpu_mp_lmb_reserve(lmb);
 157 #endif
 158
 159         return ;
 160 }
 161
 162 static void boot_prep_linux(bootm_headers_t *images)
 163 {
 164 #ifdef CONFIG_MP
 165         /*
 166          * if we are MP make sure to flush the device tree so any changes are
 167          * made visibile to all other cores.  In AMP boot scenarios the cores
 168          * might not be HW cache coherent with each other.
 169          */
 170         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 171 #endif
 172 }
 173
 174 static int boot_cmdline_linux(bootm_headers_t *images)
 175 {
 176         ulong of_size = images->ft_len;
 177         struct lmb *lmb = &images->lmb;
 178         ulong *cmd_start = &images->cmdline_start;
 179         ulong *cmd_end = &images->cmdline_end;
 180
 181         int ret = 0;
 182
 183         if (!of_size) {
 184                 /* allocate space and init command line */
 185                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 186                 if (ret) {
 187                         puts("ERROR with allocation of cmdline\n");
 188                         return ret;
 189                 }
 190         }
 191
 192         return ret;
 193 }
 194
 195 static int boot_bd_t_linux(bootm_headers_t *images)
 196 {
 197         ulong of_size = images->ft_len;
 198         struct lmb *lmb = &images->lmb;
 199         bd_t **kbd = &images->kbd;
 200
 201         int ret = 0;
 202
 203         if (!of_size) {
 204                 /* allocate space for kernel copy of board info */
 205                 ret = boot_get_kbd (lmb, kbd);
 206                 if (ret) {
 207                         puts("ERROR with allocation of kernel bd\n");
 208                         return ret;
 209                 }
 210                 set_clocks_in_mhz(*kbd);
 211         }
 212
 213         return ret;
 214 }
 215
 216 static int boot_body_linux(bootm_headers_t *images)
 217 {
 218         int ret;
 219
 220         /* allocate space for kernel copy of board info */
 221         ret = boot_bd_t_linux(images);
 222         if (ret)
 223                 return ret;
 224
 225         ret = image_setup_linux(images);
 226         if (ret)
 227                 return ret;
 228
 229         return 0;
 230 }
 231
 232 noinline
 233 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 234 {
 235         int     ret;
 236
 237         if (flag & BOOTM_STATE_OS_CMDLINE) {
 238                 boot_cmdline_linux(images);
 239                 return 0;
 240         }
 241
 242         if (flag & BOOTM_STATE_OS_BD_T) {
 243                 boot_bd_t_linux(images);
 244                 return 0;
 245         }
 246
 247         if (flag & BOOTM_STATE_OS_PREP) {
 248                 boot_prep_linux(images);
 249                 return 0;
 250         }
 251
 252         boot_prep_linux(images);
 253         ret = boot_body_linux(images);
 254         if (ret)
 255                 return ret;
 256         boot_jump_linux(images);
 257
 258         return 0;
 259 }
 260
 261 static ulong get_sp (void)
 262 {
 263         ulong sp;
 264
 265         asm( "mr %0,1": "=r"(sp) : );
 266         return sp;
 267 }
 268
 269 static void set_clocks_in_mhz (bd_t *kbd)
 270 {
 271         char    *s;
 272
 273         s = env_get("clocks_in_mhz");
 274         if (s) {
 275                 /* convert all clock information to MHz */
 276                 kbd->bi_intfreq /= 1000000L;
 277                 kbd->bi_busfreq /= 1000000L;
 278 #if defined(CONFIG_CPM2)
 279                 kbd->bi_cpmfreq /= 1000000L;
 280                 kbd->bi_brgfreq /= 1000000L;
 281                 kbd->bi_sccfreq /= 1000000L;
 282                 kbd->bi_vco     /= 1000000L;
 283 #endif
 284         }
 285 }
 286
 287 #if defined(CONFIG_BOOTM_VXWORKS)
 288 void boot_prep_vxworks(bootm_headers_t *images)
 289 {
 290 #if defined(CONFIG_OF_LIBFDT)
 291         int off;
 292         u64 base, size;
 293
 294         if (!images->ft_addr)
 295                 return;
 296
 297         base = (u64)gd->bd->bi_memstart;
 298         size = (u64)gd->bd->bi_memsize;
 299
 300         off = fdt_path_offset(images->ft_addr, "/memory");
 301         if (off < 0)
 302                 fdt_fixup_memory(images->ft_addr, base, size);
 303
 304 #if defined(CONFIG_MP)
 305 #if defined(CONFIG_MPC85xx)
 306         ft_fixup_cpu(images->ft_addr, base + size);
 307         ft_fixup_num_cores(images->ft_addr);
 308 #elif defined(CONFIG_MPC86xx)
 309         off = fdt_add_mem_rsv(images->ft_addr,
 310                         determine_mp_bootpg(NULL), (u64)4096);
 311         if (off < 0)
 312                 printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
 313         ft_fixup_num_cores(images->ft_addr);
 314 #endif
 315         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 316 #endif
 317 #endif
 318 }
 319
 320 void boot_jump_vxworks(bootm_headers_t *images)
 321 {
 322         /* PowerPC VxWorks boot interface conforms to the ePAPR standard
 323          * general purpuse registers:
 324          *
 325          *      r3: Effective address of the device tree image
 326          *      r4: 0
 327          *      r5: 0
 328          *      r6: ePAPR magic value
 329          *      r7: shall be the size of the boot IMA in bytes
 330          *      r8: 0
 331          *      r9: 0
 332          *      TCR: WRC = 0, no watchdog timer reset will occur
 333          */
 334         WATCHDOG_RESET();
 335
 336         ((void (*)(void *, ulong, ulong, ulong,
 337                 ulong, ulong, ulong))images->ep)(images->ft_addr,
 338                 0, 0, EPAPR_MAGIC, env_get_bootm_mapsize(), 0, 0);
 339 }
 340 #endif