arch/m68k/lib/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <image.h>
  11 #include <u-boot/zlib.h>
  12 #include <bzlib.h>
  13 #include <watchdog.h>
  14 #include <environment.h>
  15 #include <asm/byteorder.h>
  16 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  17 # include <status_led.h>
  18 #endif
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 #define PHYSADDR(x) x
  23
  24 #define LINUX_MAX_ENVS          256
  25 #define LINUX_MAX_ARGS          256
  26
  27 static ulong get_sp (void);
  28 static void set_clocks_in_mhz (bd_t *kbd);
  29
  30 void arch_lmb_reserve(struct lmb *lmb)
  31 {
  32         ulong sp;
  33
  34         /*
  35          * Booting a (Linux) kernel image
  36          *
  37          * Allocate space for command line and board info - the
  38          * address should be as high as possible within the reach of
  39          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  40          * memory, which means far enough below the current stack
  41          * pointer.
  42          */
  43         sp = get_sp();
  44         debug ("## Current stack ends at 0x%08lx ", sp);
  45
  46         /* adjust sp by 1K to be safe */
  47         sp -= 1024;
  48         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  49 }
  50
  51 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  52 {
  53         int ret;
  54         bd_t  *kbd;
  55         void  (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
  56         struct lmb *lmb = &images->lmb;
  57
  58         /*
  59          * allow the PREP bootm subcommand, it is required for bootm to work
  60          */
  61         if (flag & BOOTM_STATE_OS_PREP)
  62                 return 0;
  63
  64         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  65                 return 1;
  66
  67         /* allocate space for kernel copy of board info */
  68         ret = boot_get_kbd (lmb, &kbd);
  69         if (ret) {
  70                 puts("ERROR with allocation of kernel bd\n");
  71                 goto error;
  72         }
  73         set_clocks_in_mhz(kbd);
  74
  75         ret = image_setup_linux(images);
  76         if (ret)
  77                 goto error;
  78
  79         kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
  80
  81         debug("## Transferring control to Linux (at address %08lx) ...\n",
  82               (ulong) kernel);
  83
  84         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  85
  86         /*
  87          * Linux Kernel Parameters (passing board info data):
  88          *   sp+00: Ignore, side effect of using jsr to jump to kernel
  89          *   sp+04: ptr to board info data
  90          *   sp+08: initrd_start or 0 if no initrd
  91          *   sp+12: initrd_end - unused if initrd_start is 0
  92          *   sp+16: Start of command line string
  93          *   sp+20: End   of command line string
  94          */
  95         (*kernel)(kbd, images->initrd_start, images->initrd_end,
  96                   images->cmdline_start, images->cmdline_end);
  97         /* does not return */
  98 error:
  99         return 1;
 100 }
 101
 102 static ulong get_sp (void)
 103 {
 104         ulong sp;
 105
 106         asm("movel %%a7, %%d0\n"
 107             "movel %%d0, %0\n": "=d"(sp): :"%d0");
 108
 109         return sp;
 110 }
 111
 112 static void set_clocks_in_mhz (bd_t *kbd)
 113 {
 114         char *s;
 115
 116         s = env_get("clocks_in_mhz");
 117         if (s) {
 118                 /* convert all clock information to MHz */
 119                 kbd->bi_intfreq /= 1000000L;
 120                 kbd->bi_busfreq /= 1000000L;
 121         }
 122 }