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 <env.h>
  13 #include <image.h>
  14 #include <asm/byteorder.h>
  15 #include <asm/global_data.h>
  16 #include <asm/zimage.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 #ifdef CONFIG_SYS_DEBUG
  21 static void hexdump(unsigned char *buf, int len)
  22 {
  23         int i;
  24
  25         for (i = 0; i < len; i++) {
  26                 if ((i % 16) == 0)
  27                         printf("%s%08x: ", i ? "\n" : "",
  28                                                         (unsigned int)&buf[i]);
  29                 printf("%02x ", buf[i]);
  30         }
  31         printf("\n");
  32 }
  33 #endif
  34
  35 #ifdef CONFIG_SH_SDRAM_OFFSET
  36 #define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
  37 #else
  38 #define GET_INITRD_START(initrd, linux) (initrd - linux)
  39 #endif
  40
  41 static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
  42 {
  43         *(unsigned long *)(param_addr) = data;
  44 }
  45
  46 static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
  47 {
  48         unsigned long val = 0;
  49         char *p = strstr(cmdline, key);
  50         if (p) {
  51                 p += strlen(key);
  52                 val = simple_strtol(p, NULL, base);
  53         }
  54         return val;
  55 }
  56
  57 int do_bootm_linux(int flag, int argc, char *const argv[],
  58                    bootm_headers_t *images)
  59 {
  60         /* Linux kernel load address */
  61         void (*kernel) (void) = (void (*)(void))images->ep;
  62         /* empty_zero_page */
  63         unsigned char *param
  64                 = (unsigned char *)image_get_load(images->legacy_hdr_os);
  65         /* Linux kernel command line */
  66         char *cmdline = (char *)param + COMMAND_LINE;
  67         /* PAGE_SIZE */
  68         unsigned long size = images->ep - (unsigned long)param;
  69         char *bootargs = env_get("bootargs");
  70
  71         /*
  72          * allow the PREP bootm subcommand, it is required for bootm to work
  73          */
  74         if (flag & BOOTM_STATE_OS_PREP)
  75                 return 0;
  76
  77         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  78                 return 1;
  79
  80         /* Clear zero page */
  81         memset(param, 0, size);
  82
  83         /* Set commandline */
  84         strcpy(cmdline, bootargs);
  85
  86         /* Initrd */
  87         if (images->rd_start || images->rd_end) {
  88                 unsigned long ramdisk_flags = 0;
  89                 int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
  90                 if (val == 1)
  91                                 ramdisk_flags |= RD_PROMPT;
  92                 else
  93                                 ramdisk_flags &= ~RD_PROMPT;
  94
  95                 val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
  96                 if (val == 1)
  97                                 ramdisk_flags |= RD_DOLOAD;
  98                 else
  99                                 ramdisk_flags &= ~RD_DOLOAD;
 100
 101                 set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
 102                 set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
 103                 set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
 104                 set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
 105                 set_sh_linux_param((unsigned long)param + INITRD_START,
 106                         GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
 107                 set_sh_linux_param((unsigned long)param + INITRD_SIZE,
 108                         images->rd_end - images->rd_start);
 109         }
 110
 111         /* Boot kernel */
 112         kernel();
 113
 114         /* does not return */
 115         return 1;
 116 }
 117
 118 static ulong get_sp(void)
 119 {
 120         ulong ret;
 121
 122         asm("mov r15, %0" : "=r"(ret) : );
 123         return ret;
 124 }
 125
 126 void arch_lmb_reserve(struct lmb *lmb)
 127 {
 128         arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
 129 }