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 extern ulong get_effective_memsize(void);
  34 static ulong get_sp (void);
  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 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  57         unlock_ram_in_cache();
  58 #endif
  59
  60 #if defined(CONFIG_OF_LIBFDT)
  61         if (of_flat_tree) {     /* device tree; boot new style */
  62                 /*
  63                  * Linux Kernel Parameters (passing device tree):
  64                  *   r3: pointer to the fdt
  65                  *   r4: 0
  66                  *   r5: 0
  67                  *   r6: epapr magic
  68                  *   r7: size of IMA in bytes
  69                  *   r8: 0
  70                  *   r9: 0
  71                  */
  72                 debug ("   Booting using OF flat tree...\n");
  73                 WATCHDOG_RESET ();
  74                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  75                            getenv_bootm_mapsize(), 0, 0);
  76                 /* does not return */
  77         } else
  78 #endif
  79         {
  80                 /*
  81                  * Linux Kernel Parameters (passing board info data):
  82                  *   r3: ptr to board info data
  83                  *   r4: initrd_start or 0 if no initrd
  84                  *   r5: initrd_end - unused if r4 is 0
  85                  *   r6: Start of command line string
  86                  *   r7: End   of command line string
  87                  *   r8: 0
  88                  *   r9: 0
  89                  */
  90                 ulong cmd_start = images->cmdline_start;
  91                 ulong cmd_end = images->cmdline_end;
  92                 ulong initrd_start = images->initrd_start;
  93                 ulong initrd_end = images->initrd_end;
  94                 bd_t *kbd = images->kbd;
  95
  96                 debug ("   Booting using board info...\n");
  97                 WATCHDOG_RESET ();
  98                 (*kernel) (kbd, initrd_start, initrd_end,
  99                            cmd_start, cmd_end, 0, 0);
 100                 /* does not return */
 101         }
 102         return ;
 103 }
 104
 105 void arch_lmb_reserve(struct lmb *lmb)
 106 {
 107         phys_size_t bootm_size;
 108         ulong size, sp, bootmap_base;
 109
 110         bootmap_base = getenv_bootm_low();
 111         bootm_size = getenv_bootm_size();
 112
 113 #ifdef DEBUG
 114         if (((u64)bootmap_base + bootm_size) >
 115             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 116                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 117         if ((bootmap_base + bootm_size) > get_effective_memsize())
 118                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 119 #endif
 120
 121         size = min(bootm_size, get_effective_memsize());
 122         size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 123
 124         if (size < bootm_size) {
 125                 ulong base = bootmap_base + size;
 126                 printf("WARNING: adjusting available memory to %lx\n", size);
 127                 lmb_reserve(lmb, base, bootm_size - size);
 128         }
 129
 130         /*
 131          * Booting a (Linux) kernel image
 132          *
 133          * Allocate space for command line and board info - the
 134          * address should be as high as possible within the reach of
 135          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 136          * memory, which means far enough below the current stack
 137          * pointer.
 138          */
 139         sp = get_sp();
 140         debug ("## Current stack ends at 0x%08lx\n", sp);
 141
 142         /* adjust sp by 4K to be safe */
 143         sp -= 4096;
 144         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 145
 146 #ifdef CONFIG_MP
 147         cpu_mp_lmb_reserve(lmb);
 148 #endif
 149
 150         return ;
 151 }
 152
 153 static void boot_prep_linux(bootm_headers_t *images)
 154 {
 155 #ifdef CONFIG_MP
 156         /*
 157          * if we are MP make sure to flush the device tree so any changes are
 158          * made visibile to all other cores.  In AMP boot scenarios the cores
 159          * might not be HW cache coherent with each other.
 160          */
 161         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 162 #endif
 163 }
 164
 165 static int boot_cmdline_linux(bootm_headers_t *images)
 166 {
 167         ulong of_size = images->ft_len;
 168         struct lmb *lmb = &images->lmb;
 169         ulong *cmd_start = &images->cmdline_start;
 170         ulong *cmd_end = &images->cmdline_end;
 171
 172         int ret = 0;
 173
 174         if (!of_size) {
 175                 /* allocate space and init command line */
 176                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 177                 if (ret) {
 178                         puts("ERROR with allocation of cmdline\n");
 179                         return ret;
 180                 }
 181         }
 182
 183         return ret;
 184 }
 185
 186 static int boot_bd_t_linux(bootm_headers_t *images)
 187 {
 188         ulong of_size = images->ft_len;
 189         struct lmb *lmb = &images->lmb;
 190         bd_t **kbd = &images->kbd;
 191
 192         int ret = 0;
 193
 194         if (!of_size) {
 195                 /* allocate space for kernel copy of board info */
 196                 ret = boot_get_kbd (lmb, kbd);
 197                 if (ret) {
 198                         puts("ERROR with allocation of kernel bd\n");
 199                         return ret;
 200                 }
 201                 set_clocks_in_mhz(*kbd);
 202         }
 203
 204         return ret;
 205 }
 206
 207 static int boot_body_linux(bootm_headers_t *images)
 208 {
 209         int ret;
 210
 211         /* allocate space for kernel copy of board info */
 212         ret = boot_bd_t_linux(images);
 213         if (ret)
 214                 return ret;
 215
 216         ret = image_setup_linux(images);
 217         if (ret)
 218                 return ret;
 219
 220         return 0;
 221 }
 222
 223 noinline
 224 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 225 {
 226         int     ret;
 227
 228         if (flag & BOOTM_STATE_OS_CMDLINE) {
 229                 boot_cmdline_linux(images);
 230                 return 0;
 231         }
 232
 233         if (flag & BOOTM_STATE_OS_BD_T) {
 234                 boot_bd_t_linux(images);
 235                 return 0;
 236         }
 237
 238         if (flag & BOOTM_STATE_OS_PREP) {
 239                 boot_prep_linux(images);
 240                 return 0;
 241         }
 242
 243         boot_prep_linux(images);
 244         ret = boot_body_linux(images);
 245         if (ret)
 246                 return ret;
 247         boot_jump_linux(images);
 248
 249         return 0;
 250 }
 251
 252 static ulong get_sp (void)
 253 {
 254         ulong sp;
 255
 256         asm( "mr %0,1": "=r"(sp) : );
 257         return sp;
 258 }
 259
 260 static void set_clocks_in_mhz (bd_t *kbd)
 261 {
 262         char    *s;
 263
 264         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 265                 /* convert all clock information to MHz */
 266                 kbd->bi_intfreq /= 1000000L;
 267                 kbd->bi_busfreq /= 1000000L;
 268 #if defined(CONFIG_CPM2)
 269                 kbd->bi_cpmfreq /= 1000000L;
 270                 kbd->bi_brgfreq /= 1000000L;
 271                 kbd->bi_sccfreq /= 1000000L;
 272                 kbd->bi_vco     /= 1000000L;
 273 #endif
 274 #if defined(CONFIG_MPC5xxx)
 275                 kbd->bi_ipbfreq /= 1000000L;
 276                 kbd->bi_pcifreq /= 1000000L;
 277 #endif /* CONFIG_MPC5xxx */
 278         }
 279 }