LXR uboot/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
  20DECLARE_GLOBAL_DATA_PTR;
  21
  22#define PHYSADDR(x) x
  23
  24#define LINUX_MAX_ENVS          256
  25#define LINUX_MAX_ARGS          256
  26
  27static ulong get_sp (void);
  28static void set_clocks_in_mhz (bd_t *kbd);
  29
  30void 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
  51int 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 */
  98error:
  99        return 1;
 100}
 101
 102static 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
 112static void set_clocks_in_mhz (bd_t *kbd)
 113{
 114        char *s;
 115
 116        if ((s = getenv("clocks_in_mhz")) != NULL) {
 117                /* convert all clock information to MHz */
 118                kbd->bi_intfreq /= 1000000L;
 119                kbd->bi_busfreq /= 1000000L;
 120        }
 121}
 122