2 * Copyright (c) 2011 The Chromium OS Authors.
4 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
6 * SPDX-License-Identifier: GPL-2.0+
10 * Linux x86 zImage and bzImage loading
12 * based on the procdure described in
13 * linux/Documentation/i386/boot.txt
18 #include <asm/ptrace.h>
19 #include <asm/zimage.h>
20 #include <asm/byteorder.h>
21 #include <asm/bootm.h>
22 #include <asm/bootparam.h>
23 #ifdef CONFIG_SYS_COREBOOT
24 #include <asm/arch/timestamp.h>
26 #include <linux/compiler.h>
28 DECLARE_GLOBAL_DATA_PTR;
33 * relative to setup_base (which is 0x90000 currently)
35 * 0x0000-0x7FFF Real mode kernel
36 * 0x8000-0x8FFF Stack and heap
37 * 0x9000-0x90FF Kernel command line
39 #define DEFAULT_SETUP_BASE 0x90000
40 #define COMMAND_LINE_OFFSET 0x9000
41 #define HEAP_END_OFFSET 0x8e00
43 #define COMMAND_LINE_SIZE 2048
45 static void build_command_line(char *command_line, int auto_boot)
47 char *env_command_line;
49 command_line[0] = '\0';
51 env_command_line = getenv("bootargs");
53 /* set console= argument if we use a serial console */
54 if (!strstr(env_command_line, "console=")) {
55 if (!strcmp(getenv("stdout"), "serial")) {
57 /* We seem to use serial console */
58 sprintf(command_line, "console=ttyS0,%s ",
64 strcat(command_line, "auto ");
67 strcat(command_line, env_command_line);
69 printf("Kernel command line: \"%s\"\n", command_line);
72 static int kernel_magic_ok(struct setup_header *hdr)
74 if (KERNEL_MAGIC != hdr->boot_flag) {
75 printf("Error: Invalid Boot Flag "
76 "(found 0x%04x, expected 0x%04x)\n",
77 hdr->boot_flag, KERNEL_MAGIC);
80 printf("Valid Boot Flag\n");
85 static int get_boot_protocol(struct setup_header *hdr)
87 if (hdr->header == KERNEL_V2_MAGIC) {
88 printf("Magic signature found\n");
92 printf("Magic signature not found\n");
97 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
100 struct boot_params *setup_base;
105 struct boot_params *params = (struct boot_params *)image;
106 struct setup_header *hdr = ¶ms->hdr;
108 /* base address for real-mode segment */
109 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
111 if (!kernel_magic_ok(hdr))
114 /* determine size of setup */
115 if (0 == hdr->setup_sects) {
116 printf("Setup Sectors = 0 (defaulting to 4)\n");
117 setup_size = 5 * 512;
119 setup_size = (hdr->setup_sects + 1) * 512;
122 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
124 if (setup_size > SETUP_MAX_SIZE)
125 printf("Error: Setup is too large (%d bytes)\n", setup_size);
127 /* determine boot protocol version */
128 bootproto = get_boot_protocol(hdr);
130 printf("Using boot protocol version %x.%02x\n",
131 (bootproto & 0xff00) >> 8, bootproto & 0xff);
133 if (bootproto >= 0x0200) {
134 if (hdr->setup_sects >= 15) {
135 printf("Linux kernel version %s\n",
137 hdr->kernel_version + 0x200);
139 printf("Setup Sectors < 15 - "
140 "Cannot print kernel version.\n");
144 /* Determine image type */
145 big_image = (bootproto >= 0x0200) &&
146 (hdr->loadflags & BIG_KERNEL_FLAG);
148 /* Determine load address */
150 *load_addressp = BZIMAGE_LOAD_ADDR;
152 *load_addressp = ZIMAGE_LOAD_ADDR;
154 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
155 memset(setup_base, 0, sizeof(*setup_base));
156 setup_base->hdr = params->hdr;
158 if (bootproto >= 0x0204)
159 kernel_size = hdr->syssize * 16;
161 kernel_size -= setup_size;
163 if (bootproto == 0x0100) {
165 * A very old kernel MUST have its real-mode code
168 if ((u32)setup_base != 0x90000) {
169 /* Copy the real-mode kernel */
170 memmove((void *)0x90000, setup_base, setup_size);
172 /* Copy the command line */
173 memmove((void *)0x99000,
174 (u8 *)setup_base + COMMAND_LINE_OFFSET,
178 setup_base = (struct boot_params *)0x90000;
181 /* It is recommended to clear memory up to the 32K mark */
182 memset((u8 *)0x90000 + setup_size, 0,
183 SETUP_MAX_SIZE - setup_size);
187 if (kernel_size > BZIMAGE_MAX_SIZE) {
188 printf("Error: bzImage kernel too big! "
189 "(size: %ld, max: %d)\n",
190 kernel_size, BZIMAGE_MAX_SIZE);
193 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
194 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
195 kernel_size, ZIMAGE_MAX_SIZE);
199 printf("Loading %s at address %lx (%ld bytes)\n",
200 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
202 memmove((void *)*load_addressp, image + setup_size, kernel_size);
207 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
208 unsigned long initrd_addr, unsigned long initrd_size)
210 struct setup_header *hdr = &setup_base->hdr;
211 int bootproto = get_boot_protocol(hdr);
213 setup_base->e820_entries = install_e820_map(
214 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
216 if (bootproto == 0x0100) {
217 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
218 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
220 if (bootproto >= 0x0200) {
221 hdr->type_of_loader = 8;
224 printf("Initial RAM disk at linear address "
225 "0x%08lx, size %ld bytes\n",
226 initrd_addr, initrd_size);
228 hdr->ramdisk_image = initrd_addr;
229 hdr->ramdisk_size = initrd_size;
233 if (bootproto >= 0x0201) {
234 hdr->heap_end_ptr = HEAP_END_OFFSET;
235 hdr->loadflags |= HEAP_FLAG;
239 if (bootproto >= 0x0202) {
240 hdr->cmd_line_ptr = (uintptr_t)cmd_line;
241 } else if (bootproto >= 0x0200) {
242 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
243 setup_base->screen_info.cl_offset =
244 (uintptr_t)cmd_line - (uintptr_t)setup_base;
246 hdr->setup_move_size = 0x9100;
249 /* build command line at COMMAND_LINE_OFFSET */
250 build_command_line(cmd_line, auto_boot);
253 setup_video(&setup_base->screen_info);
258 void setup_pcat_compatibility(void)
259 __attribute__((weak, alias("__setup_pcat_compatibility")));
261 void __setup_pcat_compatibility(void)
265 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
267 struct boot_params *base_ptr;
268 void *bzImage_addr = NULL;
271 ulong bzImage_size = 0;
272 ulong initrd_addr = 0;
273 ulong initrd_size = 0;
275 disable_interrupts();
277 /* Setup board for maximum PC/AT Compatibility */
278 setup_pcat_compatibility();
281 /* argv[1] holds the address of the bzImage */
284 s = getenv("fileaddr");
288 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
291 /* argv[2] holds the size of the bzImage */
292 bzImage_size = simple_strtoul(argv[2], NULL, 16);
296 initrd_addr = simple_strtoul(argv[3], NULL, 16);
298 initrd_size = simple_strtoul(argv[4], NULL, 16);
301 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
304 puts("## Kernel loading failed ...\n");
307 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
308 0, initrd_addr, initrd_size)) {
309 puts("Setting up boot parameters failed ...\n");
313 /* we assume that the kernel is in place */
314 return boot_linux_kernel((ulong)base_ptr, load_address, false);
318 zboot, 5, 0, do_zboot,
320 "[addr] [size] [initrd addr] [initrd size]\n"
321 " addr - The optional starting address of the bzimage.\n"
322 " If not set it defaults to the environment\n"
323 " variable \"fileaddr\".\n"
324 " size - The optional size of the bzimage. Defaults to\n"
326 " initrd addr - The address of the initrd image to use, if any.\n"
327 " initrd size - The size of the initrd image to use, if any.\n"