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
  22 #if defined(CONFIG_OF_LIBFDT)
  23 #include <libfdt.h>
  24 #include <fdt_support.h>
  25 #endif
  26
  27 #ifdef CONFIG_SYS_INIT_RAM_LOCK
  28 #include <asm/cache.h>
  29 #endif
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 static ulong get_sp (void);
  34 extern void ft_fixup_num_cores(void *blob);
  35 static void set_clocks_in_mhz (bd_t *kbd);
  36
  37 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  38 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  39 #endif
  40
  41 int arch_fixup_fdt(void *blob)
  42 {
  43         return 0;
  44 }
  45
  46 static void boot_jump_linux(bootm_headers_t *images)
  47 {
  48         void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
  49                           ulong r7, ulong r8, ulong r9);
  50 #ifdef CONFIG_OF_LIBFDT
  51         char *of_flat_tree = images->ft_addr;
  52 #endif
  53
  54         kernel = (void (*)(bd_t *, ulong, ulong, ulong,
  55                            ulong, ulong, ulong))images->ep;
  56         debug ("## Transferring control to Linux (at address %08lx) ...\n",
  57                 (ulong)kernel);
  58
  59         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  60
  61 #ifdef CONFIG_BOOTSTAGE_FDT
  62         bootstage_fdt_add_report();
  63 #endif
  64 #ifdef CONFIG_BOOTSTAGE_REPORT
  65         bootstage_report();
  66 #endif
  67
  68 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  69         unlock_ram_in_cache();
  70 #endif
  71
  72 #if defined(CONFIG_OF_LIBFDT)
  73         if (of_flat_tree) {     /* device tree; boot new style */
  74                 /*
  75                  * Linux Kernel Parameters (passing device tree):
  76                  *   r3: pointer to the fdt
  77                  *   r4: 0
  78                  *   r5: 0
  79                  *   r6: epapr magic
  80                  *   r7: size of IMA in bytes
  81                  *   r8: 0
  82                  *   r9: 0
  83                  */
  84                 debug ("   Booting using OF flat tree...\n");
  85                 WATCHDOG_RESET ();
  86                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  87                            getenv_bootm_mapsize(), 0, 0);
  88                 /* does not return */
  89         } else
  90 #endif
  91         {
  92                 /*
  93                  * Linux Kernel Parameters (passing board info data):
  94                  *   r3: ptr to board info data
  95                  *   r4: initrd_start or 0 if no initrd
  96                  *   r5: initrd_end - unused if r4 is 0
  97                  *   r6: Start of command line string
  98                  *   r7: End   of command line string
  99                  *   r8: 0
 100                  *   r9: 0
 101                  */
 102                 ulong cmd_start = images->cmdline_start;
 103                 ulong cmd_end = images->cmdline_end;
 104                 ulong initrd_start = images->initrd_start;
 105                 ulong initrd_end = images->initrd_end;
 106                 bd_t *kbd = images->kbd;
 107
 108                 debug ("   Booting using board info...\n");
 109                 WATCHDOG_RESET ();
 110                 (*kernel) (kbd, initrd_start, initrd_end,
 111                            cmd_start, cmd_end, 0, 0);
 112                 /* does not return */
 113         }
 114         return ;
 115 }
 116
 117 void arch_lmb_reserve(struct lmb *lmb)
 118 {
 119         phys_size_t bootm_size;
 120         ulong size, sp, bootmap_base;
 121
 122         bootmap_base = getenv_bootm_low();
 123         bootm_size = getenv_bootm_size();
 124
 125 #ifdef DEBUG
 126         if (((u64)bootmap_base + bootm_size) >
 127             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 128                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 129         if ((bootmap_base + bootm_size) > get_effective_memsize())
 130                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 131 #endif
 132
 133         size = min(bootm_size, get_effective_memsize());
 134         size = min(size, (ulong)CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 135
 136         if (size < bootm_size) {
 137                 ulong base = bootmap_base + size;
 138                 printf("WARNING: adjusting available memory to %lx\n", size);
 139                 lmb_reserve(lmb, base, bootm_size - size);
 140         }
 141
 142         /*
 143          * Booting a (Linux) kernel image
 144          *
 145          * Allocate space for command line and board info - the
 146          * address should be as high as possible within the reach of
 147          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 148          * memory, which means far enough below the current stack
 149          * pointer.
 150          */
 151         sp = get_sp();
 152         debug ("## Current stack ends at 0x%08lx\n", sp);
 153
 154         /* adjust sp by 4K to be safe */
 155         sp -= 4096;
 156         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 157
 158 #ifdef CONFIG_MP
 159         cpu_mp_lmb_reserve(lmb);
 160 #endif
 161
 162         return ;
 163 }
 164
 165 static void boot_prep_linux(bootm_headers_t *images)
 166 {
 167 #ifdef CONFIG_MP
 168         /*
 169          * if we are MP make sure to flush the device tree so any changes are
 170          * made visibile to all other cores.  In AMP boot scenarios the cores
 171          * might not be HW cache coherent with each other.
 172          */
 173         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 174 #endif
 175 }
 176
 177 static int boot_cmdline_linux(bootm_headers_t *images)
 178 {
 179         ulong of_size = images->ft_len;
 180         struct lmb *lmb = &images->lmb;
 181         ulong *cmd_start = &images->cmdline_start;
 182         ulong *cmd_end = &images->cmdline_end;
 183
 184         int ret = 0;
 185
 186         if (!of_size) {
 187                 /* allocate space and init command line */
 188                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 189                 if (ret) {
 190                         puts("ERROR with allocation of cmdline\n");
 191                         return ret;
 192                 }
 193         }
 194
 195         return ret;
 196 }
 197
 198 static int boot_bd_t_linux(bootm_headers_t *images)
 199 {
 200         ulong of_size = images->ft_len;
 201         struct lmb *lmb = &images->lmb;
 202         bd_t **kbd = &images->kbd;
 203
 204         int ret = 0;
 205
 206         if (!of_size) {
 207                 /* allocate space for kernel copy of board info */
 208                 ret = boot_get_kbd (lmb, kbd);
 209                 if (ret) {
 210                         puts("ERROR with allocation of kernel bd\n");
 211                         return ret;
 212                 }
 213                 set_clocks_in_mhz(*kbd);
 214         }
 215
 216         return ret;
 217 }
 218
 219 static int boot_body_linux(bootm_headers_t *images)
 220 {
 221         int ret;
 222
 223         /* allocate space for kernel copy of board info */
 224         ret = boot_bd_t_linux(images);
 225         if (ret)
 226                 return ret;
 227
 228         ret = image_setup_linux(images);
 229         if (ret)
 230                 return ret;
 231
 232         return 0;
 233 }
 234
 235 noinline
 236 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 237 {
 238         int     ret;
 239
 240         if (flag & BOOTM_STATE_OS_CMDLINE) {
 241                 boot_cmdline_linux(images);
 242                 return 0;
 243         }
 244
 245         if (flag & BOOTM_STATE_OS_BD_T) {
 246                 boot_bd_t_linux(images);
 247                 return 0;
 248         }
 249
 250         if (flag & BOOTM_STATE_OS_PREP) {
 251                 boot_prep_linux(images);
 252                 return 0;
 253         }
 254
 255         boot_prep_linux(images);
 256         ret = boot_body_linux(images);
 257         if (ret)
 258                 return ret;
 259         boot_jump_linux(images);
 260
 261         return 0;
 262 }
 263
 264 static ulong get_sp (void)
 265 {
 266         ulong sp;
 267
 268         asm( "mr %0,1": "=r"(sp) : );
 269         return sp;
 270 }
 271
 272 static void set_clocks_in_mhz (bd_t *kbd)
 273 {
 274         char    *s;
 275
 276         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 277                 /* convert all clock information to MHz */
 278                 kbd->bi_intfreq /= 1000000L;
 279                 kbd->bi_busfreq /= 1000000L;
 280 #if defined(CONFIG_CPM2)
 281                 kbd->bi_cpmfreq /= 1000000L;
 282                 kbd->bi_brgfreq /= 1000000L;
 283                 kbd->bi_sccfreq /= 1000000L;
 284                 kbd->bi_vco     /= 1000000L;
 285 #endif
 286 #if defined(CONFIG_MPC5xxx)
 287                 kbd->bi_ipbfreq /= 1000000L;
 288                 kbd->bi_pcifreq /= 1000000L;
 289 #endif /* CONFIG_MPC5xxx */
 290         }
 291 }
 292
 293 #if defined(CONFIG_BOOTM_VXWORKS)
 294 void boot_prep_vxworks(bootm_headers_t *images)
 295 {
 296 #if defined(CONFIG_OF_LIBFDT)
 297         int off;
 298         u64 base, size;
 299
 300         if (!images->ft_addr)
 301                 return;
 302
 303         base = (u64)gd->bd->bi_memstart;
 304         size = (u64)gd->bd->bi_memsize;
 305
 306         off = fdt_path_offset(images->ft_addr, "/memory");
 307         if (off < 0)
 308                 fdt_fixup_memory(images->ft_addr, base, size);
 309
 310 #if defined(CONFIG_MP)
 311 #if defined(CONFIG_MPC85xx)
 312         ft_fixup_cpu(images->ft_addr, base + size);
 313         ft_fixup_num_cores(images->ft_addr);
 314 #elif defined(CONFIG_MPC86xx)
 315         off = fdt_add_mem_rsv(images->ft_addr,
 316                         determine_mp_bootpg(NULL), (u64)4096);
 317         if (off < 0)
 318                 printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
 319         ft_fixup_num_cores(images->ft_addr);
 320 #endif
 321         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 322 #endif
 323 #endif
 324 }
 325
 326 void boot_jump_vxworks(bootm_headers_t *images)
 327 {
 328         /* PowerPC VxWorks boot interface conforms to the ePAPR standard
 329          * general purpuse registers:
 330          *
 331          *      r3: Effective address of the device tree image
 332          *      r4: 0
 333          *      r5: 0
 334          *      r6: ePAPR magic value
 335          *      r7: shall be the size of the boot IMA in bytes
 336          *      r8: 0
 337          *      r9: 0
 338          *      TCR: WRC = 0, no watchdog timer reset will occur
 339          */
 340         WATCHDOG_RESET();
 341
 342         ((void (*)(void *, ulong, ulong, ulong,
 343                 ulong, ulong, ulong))images->ep)(images->ft_addr,
 344                 0, 0, EPAPR_MAGIC, getenv_bootm_mapsize(), 0, 0);
 345 }
 346 #endif