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