sh: Add support load and boot of Initrd.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

diff --git a/arch/sh/lib/bootm.c b/arch/sh/lib/bootm.c
index 9c58ed7..019e8ec 100644 (file)
--- a/arch/sh/lib/bootm.c
+++ b/arch/sh/lib/bootm.c
@@ -43,6 +43,41 @@ static void hexdump(unsigned char *buf, int len)
 }
 #endif
 
+#define MOUNT_ROOT_RDONLY      0x000
+#define RAMDISK_FLAGS          0x004
+#define ORIG_ROOT_DEV          0x008
+#define LOADER_TYPE                    0x00c
+#define INITRD_START           0x010
+#define INITRD_SIZE                    0x014
+#define COMMAND_LINE           0x100
+
+#define RD_PROMPT      (1<<15)
+#define RD_DOLOAD      (1<<14)
+#define CMD_ARG_RD_PROMPT      "prompt_ramdisk="
+#define CMD_ARG_RD_DOLOAD      "load_ramdisk="
+
+#ifdef CONFIG_SH_SDRAM_OFFSET
+#define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
+#else
+#define GET_INITRD_START(initrd, linux) (initrd - linux)
+#endif
+
+static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
+{
+       *(unsigned long *)(param_addr) = data;
+}
+
+static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
+{
+       unsigned long val = 0;
+       char *p = strstr(cmdline, key);
+       if (p) {
+               p += strlen(key);
+               val = simple_strtol(p, NULL, base);
+       }
+       return val;
+}
+
 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 {
        /* Linux kernel load address */
@@ -51,7 +86,7 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
        unsigned char *param
                = (unsigned char *)image_get_load(images->legacy_hdr_os);
        /* Linux kernel command line */
-       char *cmdline = (char *)param + 0x100;
+       char *cmdline = (char *)param + COMMAND_LINE;
        /* PAGE_SIZE */
        unsigned long size = images->ep - (unsigned long)param;
        char *bootargs = getenv("bootargs");
@@ -61,8 +96,37 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
 
        /* Setup parameters */
        memset(param, 0, size); /* Clear zero page */
+
+       /* Set commandline */
        strcpy(cmdline, bootargs);
 
+       sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
+       /* Initrd */
+       if (images->rd_start || images->rd_end) {
+               unsigned long ramdisk_flags;
+               int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
+               if (val == 1)
+                               ramdisk_flags |= RD_PROMPT;
+               else
+                               ramdisk_flags &= ~RD_PROMPT;
+                                       
+               val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
+               if (val == 1)
+                               ramdisk_flags |= RD_DOLOAD;
+               else
+                               ramdisk_flags &= ~RD_DOLOAD;
+
+               set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
+               set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
+               set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
+               set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
+               set_sh_linux_param((unsigned long)param + INITRD_START,
+                       GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
+               set_sh_linux_param((unsigned long)param + INITRD_SIZE,
+                       images->rd_end - images->rd_start);
+       }
+
+       /* Boot kernel */
        kernel();
        /* does not return */