xref: /openbmc/u-boot/common/image-android.c (revision e8f80a5a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
4  */
5 
6 #include <common.h>
7 #include <image.h>
8 #include <android_image.h>
9 #include <malloc.h>
10 #include <errno.h>
11 
12 #define ANDROID_IMAGE_DEFAULT_KERNEL_ADDR	0x10008000
13 
14 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
15 
android_image_get_kernel_addr(const struct andr_img_hdr * hdr)16 static ulong android_image_get_kernel_addr(const struct andr_img_hdr *hdr)
17 {
18 	/*
19 	 * All the Android tools that generate a boot.img use this
20 	 * address as the default.
21 	 *
22 	 * Even though it doesn't really make a lot of sense, and it
23 	 * might be valid on some platforms, we treat that adress as
24 	 * the default value for this field, and try to execute the
25 	 * kernel in place in such a case.
26 	 *
27 	 * Otherwise, we will return the actual value set by the user.
28 	 */
29 	if (hdr->kernel_addr == ANDROID_IMAGE_DEFAULT_KERNEL_ADDR)
30 		return (ulong)hdr + hdr->page_size;
31 
32 	return hdr->kernel_addr;
33 }
34 
35 /**
36  * android_image_get_kernel() - processes kernel part of Android boot images
37  * @hdr:	Pointer to image header, which is at the start
38  *			of the image.
39  * @verify:	Checksum verification flag. Currently unimplemented.
40  * @os_data:	Pointer to a ulong variable, will hold os data start
41  *			address.
42  * @os_len:	Pointer to a ulong variable, will hold os data length.
43  *
44  * This function returns the os image's start address and length. Also,
45  * it appends the kernel command line to the bootargs env variable.
46  *
47  * Return: Zero, os start address and length on success,
48  *		otherwise on failure.
49  */
android_image_get_kernel(const struct andr_img_hdr * hdr,int verify,ulong * os_data,ulong * os_len)50 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
51 			     ulong *os_data, ulong *os_len)
52 {
53 	u32 kernel_addr = android_image_get_kernel_addr(hdr);
54 
55 	/*
56 	 * Not all Android tools use the id field for signing the image with
57 	 * sha1 (or anything) so we don't check it. It is not obvious that the
58 	 * string is null terminated so we take care of this.
59 	 */
60 	strncpy(andr_tmp_str, hdr->name, ANDR_BOOT_NAME_SIZE);
61 	andr_tmp_str[ANDR_BOOT_NAME_SIZE] = '\0';
62 	if (strlen(andr_tmp_str))
63 		printf("Android's image name: %s\n", andr_tmp_str);
64 
65 	printf("Kernel load addr 0x%08x size %u KiB\n",
66 	       kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
67 
68 	int len = 0;
69 	if (*hdr->cmdline) {
70 		printf("Kernel command line: %s\n", hdr->cmdline);
71 		len += strlen(hdr->cmdline);
72 	}
73 
74 	char *bootargs = env_get("bootargs");
75 	if (bootargs)
76 		len += strlen(bootargs);
77 
78 	char *newbootargs = malloc(len + 2);
79 	if (!newbootargs) {
80 		puts("Error: malloc in android_image_get_kernel failed!\n");
81 		return -ENOMEM;
82 	}
83 	*newbootargs = '\0';
84 
85 	if (bootargs) {
86 		strcpy(newbootargs, bootargs);
87 		strcat(newbootargs, " ");
88 	}
89 	if (*hdr->cmdline)
90 		strcat(newbootargs, hdr->cmdline);
91 
92 	env_set("bootargs", newbootargs);
93 
94 	if (os_data) {
95 		*os_data = (ulong)hdr;
96 		*os_data += hdr->page_size;
97 	}
98 	if (os_len)
99 		*os_len = hdr->kernel_size;
100 	return 0;
101 }
102 
android_image_check_header(const struct andr_img_hdr * hdr)103 int android_image_check_header(const struct andr_img_hdr *hdr)
104 {
105 	return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
106 }
107 
android_image_get_end(const struct andr_img_hdr * hdr)108 ulong android_image_get_end(const struct andr_img_hdr *hdr)
109 {
110 	ulong end;
111 	/*
112 	 * The header takes a full page, the remaining components are aligned
113 	 * on page boundary
114 	 */
115 	end = (ulong)hdr;
116 	end += hdr->page_size;
117 	end += ALIGN(hdr->kernel_size, hdr->page_size);
118 	end += ALIGN(hdr->ramdisk_size, hdr->page_size);
119 	end += ALIGN(hdr->second_size, hdr->page_size);
120 
121 	return end;
122 }
123 
android_image_get_kload(const struct andr_img_hdr * hdr)124 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
125 {
126 	return android_image_get_kernel_addr(hdr);
127 }
128 
android_image_get_ramdisk(const struct andr_img_hdr * hdr,ulong * rd_data,ulong * rd_len)129 int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
130 			      ulong *rd_data, ulong *rd_len)
131 {
132 	if (!hdr->ramdisk_size) {
133 		*rd_data = *rd_len = 0;
134 		return -1;
135 	}
136 
137 	printf("RAM disk load addr 0x%08x size %u KiB\n",
138 	       hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
139 
140 	*rd_data = (unsigned long)hdr;
141 	*rd_data += hdr->page_size;
142 	*rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
143 
144 	*rd_len = hdr->ramdisk_size;
145 	return 0;
146 }
147 
android_image_get_second(const struct andr_img_hdr * hdr,ulong * second_data,ulong * second_len)148 int android_image_get_second(const struct andr_img_hdr *hdr,
149 			      ulong *second_data, ulong *second_len)
150 {
151 	if (!hdr->second_size) {
152 		*second_data = *second_len = 0;
153 		return -1;
154 	}
155 
156 	*second_data = (unsigned long)hdr;
157 	*second_data += hdr->page_size;
158 	*second_data += ALIGN(hdr->kernel_size, hdr->page_size);
159 	*second_data += ALIGN(hdr->ramdisk_size, hdr->page_size);
160 
161 	printf("second address is 0x%lx\n",*second_data);
162 
163 	*second_len = hdr->second_size;
164 	return 0;
165 }
166 
167 #if !defined(CONFIG_SPL_BUILD)
168 /**
169  * android_print_contents - prints out the contents of the Android format image
170  * @hdr: pointer to the Android format image header
171  *
172  * android_print_contents() formats a multi line Android image contents
173  * description.
174  * The routine prints out Android image properties
175  *
176  * returns:
177  *     no returned results
178  */
android_print_contents(const struct andr_img_hdr * hdr)179 void android_print_contents(const struct andr_img_hdr *hdr)
180 {
181 	const char * const p = IMAGE_INDENT_STRING;
182 	/* os_version = ver << 11 | lvl */
183 	u32 os_ver = hdr->os_version >> 11;
184 	u32 os_lvl = hdr->os_version & ((1U << 11) - 1);
185 
186 	printf("%skernel size:      %x\n", p, hdr->kernel_size);
187 	printf("%skernel address:   %x\n", p, hdr->kernel_addr);
188 	printf("%sramdisk size:     %x\n", p, hdr->ramdisk_size);
189 	printf("%sramdisk addrress: %x\n", p, hdr->ramdisk_addr);
190 	printf("%ssecond size:      %x\n", p, hdr->second_size);
191 	printf("%ssecond address:   %x\n", p, hdr->second_addr);
192 	printf("%stags address:     %x\n", p, hdr->tags_addr);
193 	printf("%spage size:        %x\n", p, hdr->page_size);
194 	/* ver = A << 14 | B << 7 | C         (7 bits for each of A, B, C)
195 	 * lvl = ((Y - 2000) & 127) << 4 | M  (7 bits for Y, 4 bits for M) */
196 	printf("%sos_version:       %x (ver: %u.%u.%u, level: %u.%u)\n",
197 	       p, hdr->os_version,
198 	       (os_ver >> 7) & 0x7F, (os_ver >> 14) & 0x7F, os_ver & 0x7F,
199 	       (os_lvl >> 4) + 2000, os_lvl & 0x0F);
200 	printf("%sname:             %s\n", p, hdr->name);
201 	printf("%scmdline:          %s\n", p, hdr->cmdline);
202 }
203 #endif
204