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  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26
  27 #include <common.h>
  28 #include <watchdog.h>
  29 #include <command.h>
  30 #include <image.h>
  31 #include <malloc.h>
  32 #include <u-boot/zlib.h>
  33 #include <bzlib.h>
  34 #include <environment.h>
  35 #include <asm/byteorder.h>
  36 #include <asm/mp.h>
  37
  38 #if defined(CONFIG_OF_LIBFDT)
  39 #include <libfdt.h>
  40 #include <fdt_support.h>
  41 #endif
  42
  43 #ifdef CONFIG_SYS_INIT_RAM_LOCK
  44 #include <asm/cache.h>
  45 #endif
  46
  47 DECLARE_GLOBAL_DATA_PTR;
  48
  49 extern ulong get_effective_memsize(void);
  50 static ulong get_sp (void);
  51 static void set_clocks_in_mhz (bd_t *kbd);
  52
  53 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  54 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  55 #endif
  56
  57 static void boot_jump_linux(bootm_headers_t *images)
  58 {
  59         void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
  60                           ulong r7, ulong r8, ulong r9);
  61 #ifdef CONFIG_OF_LIBFDT
  62         char *of_flat_tree = images->ft_addr;
  63 #endif
  64
  65         kernel = (void (*)(bd_t *, ulong, ulong, ulong,
  66                            ulong, ulong, ulong))images->ep;
  67         debug ("## Transferring control to Linux (at address %08lx) ...\n",
  68                 (ulong)kernel);
  69
  70         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  71
  72 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  73         unlock_ram_in_cache();
  74 #endif
  75
  76 #if defined(CONFIG_OF_LIBFDT)
  77         if (of_flat_tree) {     /* device tree; boot new style */
  78                 /*
  79                  * Linux Kernel Parameters (passing device tree):
  80                  *   r3: pointer to the fdt
  81                  *   r4: 0
  82                  *   r5: 0
  83                  *   r6: epapr magic
  84                  *   r7: size of IMA in bytes
  85                  *   r8: 0
  86                  *   r9: 0
  87                  */
  88                 debug ("   Booting using OF flat tree...\n");
  89                 WATCHDOG_RESET ();
  90                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  91                            getenv_bootm_mapsize(), 0, 0);
  92                 /* does not return */
  93         } else
  94 #endif
  95         {
  96                 /*
  97                  * Linux Kernel Parameters (passing board info data):
  98                  *   r3: ptr to board info data
  99                  *   r4: initrd_start or 0 if no initrd
 100                  *   r5: initrd_end - unused if r4 is 0
 101                  *   r6: Start of command line string
 102                  *   r7: End   of command line string
 103                  *   r8: 0
 104                  *   r9: 0
 105                  */
 106                 ulong cmd_start = images->cmdline_start;
 107                 ulong cmd_end = images->cmdline_end;
 108                 ulong initrd_start = images->initrd_start;
 109                 ulong initrd_end = images->initrd_end;
 110                 bd_t *kbd = images->kbd;
 111
 112                 debug ("   Booting using board info...\n");
 113                 WATCHDOG_RESET ();
 114                 (*kernel) (kbd, initrd_start, initrd_end,
 115                            cmd_start, cmd_end, 0, 0);
 116                 /* does not return */
 117         }
 118         return ;
 119 }
 120
 121 void arch_lmb_reserve(struct lmb *lmb)
 122 {
 123         phys_size_t bootm_size;
 124         ulong size, sp, bootmap_base;
 125
 126         bootmap_base = getenv_bootm_low();
 127         bootm_size = getenv_bootm_size();
 128
 129 #ifdef DEBUG
 130         if (((u64)bootmap_base + bootm_size) >
 131             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 132                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 133         if ((bootmap_base + bootm_size) > get_effective_memsize())
 134                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 135 #endif
 136
 137         size = min(bootm_size, get_effective_memsize());
 138         size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 139
 140         if (size < bootm_size) {
 141                 ulong base = bootmap_base + size;
 142                 printf("WARNING: adjusting available memory to %lx\n", size);
 143                 lmb_reserve(lmb, base, bootm_size - size);
 144         }
 145
 146         /*
 147          * Booting a (Linux) kernel image
 148          *
 149          * Allocate space for command line and board info - the
 150          * address should be as high as possible within the reach of
 151          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 152          * memory, which means far enough below the current stack
 153          * pointer.
 154          */
 155         sp = get_sp();
 156         debug ("## Current stack ends at 0x%08lx\n", sp);
 157
 158         /* adjust sp by 4K to be safe */
 159         sp -= 4096;
 160         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 161
 162 #ifdef CONFIG_MP
 163         cpu_mp_lmb_reserve(lmb);
 164 #endif
 165
 166         return ;
 167 }
 168
 169 static void boot_prep_linux(bootm_headers_t *images)
 170 {
 171 #ifdef CONFIG_MP
 172         /*
 173          * if we are MP make sure to flush the device tree so any changes are
 174          * made visibile to all other cores.  In AMP boot scenarios the cores
 175          * might not be HW cache coherent with each other.
 176          */
 177         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 178 #endif
 179 }
 180
 181 static int boot_cmdline_linux(bootm_headers_t *images)
 182 {
 183         ulong of_size = images->ft_len;
 184         struct lmb *lmb = &images->lmb;
 185         ulong *cmd_start = &images->cmdline_start;
 186         ulong *cmd_end = &images->cmdline_end;
 187
 188         int ret = 0;
 189
 190         if (!of_size) {
 191                 /* allocate space and init command line */
 192                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 193                 if (ret) {
 194                         puts("ERROR with allocation of cmdline\n");
 195                         return ret;
 196                 }
 197         }
 198
 199         return ret;
 200 }
 201
 202 static int boot_bd_t_linux(bootm_headers_t *images)
 203 {
 204         ulong of_size = images->ft_len;
 205         struct lmb *lmb = &images->lmb;
 206         bd_t **kbd = &images->kbd;
 207
 208         int ret = 0;
 209
 210         if (!of_size) {
 211                 /* allocate space for kernel copy of board info */
 212                 ret = boot_get_kbd (lmb, kbd);
 213                 if (ret) {
 214                         puts("ERROR with allocation of kernel bd\n");
 215                         return ret;
 216                 }
 217                 set_clocks_in_mhz(*kbd);
 218         }
 219
 220         return ret;
 221 }
 222
 223 static int boot_body_linux(bootm_headers_t *images)
 224 {
 225         int ret;
 226
 227         /* allocate space for kernel copy of board info */
 228         ret = boot_bd_t_linux(images);
 229         if (ret)
 230                 return ret;
 231
 232         ret = image_setup_linux(images);
 233         if (ret)
 234                 return ret;
 235
 236         return 0;
 237 }
 238
 239 noinline
 240 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 241 {
 242         int     ret;
 243
 244         if (flag & BOOTM_STATE_OS_CMDLINE) {
 245                 boot_cmdline_linux(images);
 246                 return 0;
 247         }
 248
 249         if (flag & BOOTM_STATE_OS_BD_T) {
 250                 boot_bd_t_linux(images);
 251                 return 0;
 252         }
 253
 254         if (flag & BOOTM_STATE_OS_PREP) {
 255                 boot_prep_linux(images);
 256                 return 0;
 257         }
 258
 259         if (flag & BOOTM_STATE_OS_GO) {
 260                 boot_jump_linux(images);
 261                 return 0;
 262         }
 263
 264         boot_prep_linux(images);
 265         ret = boot_body_linux(images);
 266         if (ret)
 267                 return ret;
 268         boot_jump_linux(images);
 269
 270         return 0;
 271 }
 272
 273 static ulong get_sp (void)
 274 {
 275         ulong sp;
 276
 277         asm( "mr %0,1": "=r"(sp) : );
 278         return sp;
 279 }
 280
 281 static void set_clocks_in_mhz (bd_t *kbd)
 282 {
 283         char    *s;
 284
 285         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 286                 /* convert all clock information to MHz */
 287                 kbd->bi_intfreq /= 1000000L;
 288                 kbd->bi_busfreq /= 1000000L;
 289 #if defined(CONFIG_CPM2)
 290                 kbd->bi_cpmfreq /= 1000000L;
 291                 kbd->bi_brgfreq /= 1000000L;
 292                 kbd->bi_sccfreq /= 1000000L;
 293                 kbd->bi_vco     /= 1000000L;
 294 #endif
 295 #if defined(CONFIG_MPC5xxx)
 296                 kbd->bi_ipbfreq /= 1000000L;
 297                 kbd->bi_pcifreq /= 1000000L;
 298 #endif /* CONFIG_MPC5xxx */
 299         }
 300 }