LXR uboot/arch/m68k/lib/bootm.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2003
   4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5 */
   6
   7#include <common.h>
   8#include <bootstage.h>
   9#include <command.h>
  10#include <env.h>
  11#include <image.h>
  12#include <lmb.h>
  13#include <log.h>
  14#include <asm/global_data.h>
  15#include <u-boot/zlib.h>
  16#include <bzlib.h>
  17#include <watchdog.h>
  18#include <asm/byteorder.h>
  19#ifdef CONFIG_SHOW_BOOT_PROGRESS
  20# include <status_led.h>
  21#endif
  22
  23DECLARE_GLOBAL_DATA_PTR;
  24
  25#define PHYSADDR(x) x
  26
  27#define LINUX_MAX_ENVS          256
  28#define LINUX_MAX_ARGS          256
  29
  30static ulong get_sp (void);
  31static void set_clocks_in_mhz (struct bd_info *kbd);
  32
  33void arch_lmb_reserve(struct lmb *lmb)
  34{
  35        ulong sp;
  36
  37        /*
  38         * Booting a (Linux) kernel image
  39         *
  40         * Allocate space for command line and board info - the
  41         * address should be as high as possible within the reach of
  42         * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  43         * memory, which means far enough below the current stack
  44         * pointer.
  45         */
  46        sp = get_sp();
  47        debug ("## Current stack ends at 0x%08lx ", sp);
  48
  49        /* adjust sp by 1K to be safe */
  50        sp -= 1024;
  51        lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  52}
  53
  54int do_bootm_linux(int flag, int argc, char *const argv[],
  55                   bootm_headers_t *images)
  56{
  57        int ret;
  58        struct bd_info  *kbd;
  59        void  (*kernel) (struct bd_info *, ulong, ulong, ulong, ulong);
  60        struct lmb *lmb = &images->lmb;
  61
  62        /*
  63         * allow the PREP bootm subcommand, it is required for bootm to work
  64         */
  65        if (flag & BOOTM_STATE_OS_PREP)
  66                return 0;
  67
  68        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  69                return 1;
  70
  71        /* allocate space for kernel copy of board info */
  72        ret = boot_get_kbd (lmb, &kbd);
  73        if (ret) {
  74                puts("ERROR with allocation of kernel bd\n");
  75                goto error;
  76        }
  77        set_clocks_in_mhz(kbd);
  78
  79        ret = image_setup_linux(images);
  80        if (ret)
  81                goto error;
  82
  83        kernel = (void (*)(struct bd_info *, ulong, ulong, ulong, ulong))images->ep;
  84
  85        debug("## Transferring control to Linux (at address %08lx) ...\n",
  86              (ulong) kernel);
  87
  88        bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  89
  90        /*
  91         * Linux Kernel Parameters (passing board info data):
  92         *   sp+00: Ignore, side effect of using jsr to jump to kernel
  93         *   sp+04: ptr to board info data
  94         *   sp+08: initrd_start or 0 if no initrd
  95         *   sp+12: initrd_end - unused if initrd_start is 0
  96         *   sp+16: Start of command line string
  97         *   sp+20: End   of command line string
  98         */
  99        (*kernel)(kbd, images->initrd_start, images->initrd_end,
 100                  images->cmdline_start, images->cmdline_end);
 101        /* does not return */
 102error:
 103        return 1;
 104}
 105
 106static ulong get_sp (void)
 107{
 108        ulong sp;
 109
 110        asm("movel %%a7, %%d0\n"
 111            "movel %%d0, %0\n": "=d"(sp): :"%d0");
 112
 113        return sp;
 114}
 115
 116static void set_clocks_in_mhz (struct bd_info *kbd)
 117{
 118        char *s;
 119
 120        s = env_get("clocks_in_mhz");
 121        if (s) {
 122                /* convert all clock information to MHz */
 123                kbd->bi_intfreq /= 1000000L;
 124                kbd->bi_busfreq /= 1000000L;
 125        }
 126}
 127