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