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>

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 */