xref: /openbmc/u-boot/arch/sh/lib/bootm.c (revision a373024e)
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 = env_get("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 }
112