arch/sh/lib/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (c) Copyright 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   6  * (c) Copyright 2008 Renesas Solutions Corp.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <asm/byteorder.h>
  14 #include <asm/zimage.h>
  15
  16 #ifdef CONFIG_SYS_DEBUG
  17 static void hexdump(unsigned char *buf, int len)
  18 {
  19         int i;
  20
  21         for (i = 0; i < len; i++) {
  22                 if ((i % 16) == 0)
  23                         printf("%s%08x: ", i ? "\n" : "",
  24                                                         (unsigned int)&buf[i]);
  25                 printf("%02x ", buf[i]);
  26         }
  27         printf("\n");
  28 }
  29 #endif
  30
  31 #ifdef CONFIG_SH_SDRAM_OFFSET
  32 #define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
  33 #else
  34 #define GET_INITRD_START(initrd, linux) (initrd - linux)
  35 #endif
  36
  37 static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
  38 {
  39         *(unsigned long *)(param_addr) = data;
  40 }
  41
  42 static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
  43 {
  44         unsigned long val = 0;
  45         char *p = strstr(cmdline, key);
  46         if (p) {
  47                 p += strlen(key);
  48                 val = simple_strtol(p, NULL, base);
  49         }
  50         return val;
  51 }
  52
  53 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  54 {
  55         /* Linux kernel load address */
  56         void (*kernel) (void) = (void (*)(void))images->ep;
  57         /* empty_zero_page */
  58         unsigned char *param
  59                 = (unsigned char *)image_get_load(images->legacy_hdr_os);
  60         /* Linux kernel command line */
  61         char *cmdline = (char *)param + COMMAND_LINE;
  62         /* PAGE_SIZE */
  63         unsigned long size = images->ep - (unsigned long)param;
  64         char *bootargs = getenv("bootargs");
  65
  66         /*
  67          * allow the PREP bootm subcommand, it is required for bootm to work
  68          */
  69         if (flag & BOOTM_STATE_OS_PREP)
  70                 return 0;
  71
  72         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  73                 return 1;
  74
  75         /* Clear zero page */
  76         memset(param, 0, size);
  77
  78         /* Set commandline */
  79         strcpy(cmdline, bootargs);
  80
  81         /* Initrd */
  82         if (images->rd_start || images->rd_end) {
  83                 unsigned long ramdisk_flags = 0;
  84                 int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
  85                 if (val == 1)
  86                                 ramdisk_flags |= RD_PROMPT;
  87                 else
  88                                 ramdisk_flags &= ~RD_PROMPT;
  89
  90                 val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
  91                 if (val == 1)
  92                                 ramdisk_flags |= RD_DOLOAD;
  93                 else
  94                                 ramdisk_flags &= ~RD_DOLOAD;
  95
  96                 set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
  97                 set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
  98                 set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
  99                 set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
 100                 set_sh_linux_param((unsigned long)param + INITRD_START,
 101                         GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
 102                 set_sh_linux_param((unsigned long)param + INITRD_SIZE,
 103                         images->rd_end - images->rd_start);
 104         }
 105
 106         /* Boot kernel */
 107         kernel();
 108
 109         /* does not return */
 110         return 1;
 111 }