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
17 #include <asm/acpi_table.h>
19 #include <asm/ptrace.h>
20 #include <asm/zimage.h>
21 #include <asm/byteorder.h>
22 #include <asm/bootm.h>
23 #include <asm/bootparam.h>
24 #ifdef CONFIG_SYS_COREBOOT
25 #include <asm/arch/timestamp.h>
27 #include <linux/compiler.h>
29 DECLARE_GLOBAL_DATA_PTR;
34 * relative to setup_base (which is 0x90000 currently)
36 * 0x0000-0x7FFF Real mode kernel
37 * 0x8000-0x8FFF Stack and heap
38 * 0x9000-0x90FF Kernel command line
40 #define DEFAULT_SETUP_BASE 0x90000
41 #define COMMAND_LINE_OFFSET 0x9000
42 #define HEAP_END_OFFSET 0x8e00
44 #define COMMAND_LINE_SIZE 2048
46 static void build_command_line(char *command_line, int auto_boot)
48 char *env_command_line;
50 command_line[0] = '\0';
52 env_command_line = env_get("bootargs");
54 /* set console= argument if we use a serial console */
55 if (!strstr(env_command_line, "console=")) {
56 if (!strcmp(env_get("stdout"), "serial")) {
58 /* We seem to use serial console */
59 sprintf(command_line, "console=ttyS0,%s ",
65 strcat(command_line, "auto ");
68 strcat(command_line, env_command_line);
70 printf("Kernel command line: \"%s\"\n", command_line);
73 static int kernel_magic_ok(struct setup_header *hdr)
75 if (KERNEL_MAGIC != hdr->boot_flag) {
76 printf("Error: Invalid Boot Flag "
77 "(found 0x%04x, expected 0x%04x)\n",
78 hdr->boot_flag, KERNEL_MAGIC);
81 printf("Valid Boot Flag\n");
86 static int get_boot_protocol(struct setup_header *hdr)
88 if (hdr->header == KERNEL_V2_MAGIC) {
89 printf("Magic signature found\n");
93 printf("Magic signature not found\n");
98 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
101 struct boot_params *setup_base;
106 struct boot_params *params = (struct boot_params *)image;
107 struct setup_header *hdr = ¶ms->hdr;
109 /* base address for real-mode segment */
110 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
112 if (!kernel_magic_ok(hdr))
115 /* determine size of setup */
116 if (0 == hdr->setup_sects) {
117 printf("Setup Sectors = 0 (defaulting to 4)\n");
118 setup_size = 5 * 512;
120 setup_size = (hdr->setup_sects + 1) * 512;
123 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
125 if (setup_size > SETUP_MAX_SIZE)
126 printf("Error: Setup is too large (%d bytes)\n", setup_size);
128 /* determine boot protocol version */
129 bootproto = get_boot_protocol(hdr);
131 printf("Using boot protocol version %x.%02x\n",
132 (bootproto & 0xff00) >> 8, bootproto & 0xff);
134 if (bootproto >= 0x0200) {
135 if (hdr->setup_sects >= 15) {
136 printf("Linux kernel version %s\n",
138 hdr->kernel_version + 0x200);
140 printf("Setup Sectors < 15 - "
141 "Cannot print kernel version.\n");
145 /* Determine image type */
146 big_image = (bootproto >= 0x0200) &&
147 (hdr->loadflags & BIG_KERNEL_FLAG);
149 /* Determine load address */
151 *load_addressp = BZIMAGE_LOAD_ADDR;
153 *load_addressp = ZIMAGE_LOAD_ADDR;
155 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
156 memset(setup_base, 0, sizeof(*setup_base));
157 setup_base->hdr = params->hdr;
159 if (bootproto >= 0x0204)
160 kernel_size = hdr->syssize * 16;
162 kernel_size -= setup_size;
164 if (bootproto == 0x0100) {
166 * A very old kernel MUST have its real-mode code
169 if ((ulong)setup_base != 0x90000) {
170 /* Copy the real-mode kernel */
171 memmove((void *)0x90000, setup_base, setup_size);
173 /* Copy the command line */
174 memmove((void *)0x99000,
175 (u8 *)setup_base + COMMAND_LINE_OFFSET,
179 setup_base = (struct boot_params *)0x90000;
182 /* It is recommended to clear memory up to the 32K mark */
183 memset((u8 *)0x90000 + setup_size, 0,
184 SETUP_MAX_SIZE - setup_size);
188 if (kernel_size > BZIMAGE_MAX_SIZE) {
189 printf("Error: bzImage kernel too big! "
190 "(size: %ld, max: %d)\n",
191 kernel_size, BZIMAGE_MAX_SIZE);
194 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
195 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
196 kernel_size, ZIMAGE_MAX_SIZE);
200 printf("Loading %s at address %lx (%ld bytes)\n",
201 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
203 memmove((void *)*load_addressp, image + setup_size, kernel_size);
208 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
209 unsigned long initrd_addr, unsigned long initrd_size)
211 struct setup_header *hdr = &setup_base->hdr;
212 int bootproto = get_boot_protocol(hdr);
214 setup_base->e820_entries = install_e820_map(
215 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
217 if (bootproto == 0x0100) {
218 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
219 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
221 if (bootproto >= 0x0200) {
222 hdr->type_of_loader = 8;
225 printf("Initial RAM disk at linear address "
226 "0x%08lx, size %ld bytes\n",
227 initrd_addr, initrd_size);
229 hdr->ramdisk_image = initrd_addr;
230 hdr->ramdisk_size = initrd_size;
234 if (bootproto >= 0x0201) {
235 hdr->heap_end_ptr = HEAP_END_OFFSET;
236 hdr->loadflags |= HEAP_FLAG;
240 if (bootproto >= 0x0202) {
241 hdr->cmd_line_ptr = (uintptr_t)cmd_line;
242 } else if (bootproto >= 0x0200) {
243 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
244 setup_base->screen_info.cl_offset =
245 (uintptr_t)cmd_line - (uintptr_t)setup_base;
247 hdr->setup_move_size = 0x9100;
250 /* build command line at COMMAND_LINE_OFFSET */
251 build_command_line(cmd_line, auto_boot);
254 #ifdef CONFIG_INTEL_MID
255 if (bootproto >= 0x0207)
256 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
259 #ifdef CONFIG_GENERATE_ACPI_TABLE
260 if (bootproto >= 0x020e)
261 hdr->acpi_rsdp_addr = acpi_get_rsdp_addr();
264 setup_video(&setup_base->screen_info);
269 void setup_pcat_compatibility(void)
270 __attribute__((weak, alias("__setup_pcat_compatibility")));
272 void __setup_pcat_compatibility(void)
276 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
278 struct boot_params *base_ptr;
279 void *bzImage_addr = NULL;
282 ulong bzImage_size = 0;
283 ulong initrd_addr = 0;
284 ulong initrd_size = 0;
286 disable_interrupts();
288 /* Setup board for maximum PC/AT Compatibility */
289 setup_pcat_compatibility();
292 /* argv[1] holds the address of the bzImage */
295 s = env_get("fileaddr");
299 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
302 /* argv[2] holds the size of the bzImage */
303 bzImage_size = simple_strtoul(argv[2], NULL, 16);
307 initrd_addr = simple_strtoul(argv[3], NULL, 16);
309 initrd_size = simple_strtoul(argv[4], NULL, 16);
312 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
315 puts("## Kernel loading failed ...\n");
318 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
319 0, initrd_addr, initrd_size)) {
320 puts("Setting up boot parameters failed ...\n");
324 /* we assume that the kernel is in place */
325 return boot_linux_kernel((ulong)base_ptr, load_address, false);
329 zboot, 5, 0, do_zboot,
331 "[addr] [size] [initrd addr] [initrd size]\n"
332 " addr - The optional starting address of the bzimage.\n"
333 " If not set it defaults to the environment\n"
334 " variable \"fileaddr\".\n"
335 " size - The optional size of the bzimage. Defaults to\n"
337 " initrd addr - The address of the initrd image to use, if any.\n"
338 " initrd size - The size of the initrd image to use, if any.\n"