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