1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2011 The Chromium OS Authors.
5 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
9 * Linux x86 zImage and bzImage loading
11 * based on the procdure described in
12 * 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>
28 #include <linux/libfdt.h>
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 = env_get("bootargs");
53 /* set console= argument if we use a serial console */
54 if (!strstr(env_command_line, "console=")) {
55 if (!strcmp(env_get("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 static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
99 int bootproto = get_boot_protocol(hdr);
100 struct setup_data *sd;
103 if (bootproto < 0x0209)
109 size = fdt_totalsize(fdt_blob);
113 size += sizeof(struct setup_data);
114 sd = (struct setup_data *)malloc(size);
116 printf("Not enough memory for DTB setup data\n");
120 sd->next = hdr->setup_data;
121 sd->type = SETUP_DTB;
122 sd->len = fdt_totalsize(fdt_blob);
123 memcpy(sd->data, fdt_blob, sd->len);
124 hdr->setup_data = (unsigned long)sd;
129 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
130 ulong *load_addressp)
132 struct boot_params *setup_base;
137 struct boot_params *params = (struct boot_params *)image;
138 struct setup_header *hdr = ¶ms->hdr;
140 /* base address for real-mode segment */
141 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
143 if (!kernel_magic_ok(hdr))
146 /* determine size of setup */
147 if (0 == hdr->setup_sects) {
148 printf("Setup Sectors = 0 (defaulting to 4)\n");
149 setup_size = 5 * 512;
151 setup_size = (hdr->setup_sects + 1) * 512;
154 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
156 if (setup_size > SETUP_MAX_SIZE)
157 printf("Error: Setup is too large (%d bytes)\n", setup_size);
159 /* determine boot protocol version */
160 bootproto = get_boot_protocol(hdr);
162 printf("Using boot protocol version %x.%02x\n",
163 (bootproto & 0xff00) >> 8, bootproto & 0xff);
165 if (bootproto >= 0x0200) {
166 if (hdr->setup_sects >= 15) {
167 printf("Linux kernel version %s\n",
169 hdr->kernel_version + 0x200);
171 printf("Setup Sectors < 15 - "
172 "Cannot print kernel version.\n");
176 /* Determine image type */
177 big_image = (bootproto >= 0x0200) &&
178 (hdr->loadflags & BIG_KERNEL_FLAG);
180 /* Determine load address */
182 *load_addressp = BZIMAGE_LOAD_ADDR;
184 *load_addressp = ZIMAGE_LOAD_ADDR;
186 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
187 memset(setup_base, 0, sizeof(*setup_base));
188 setup_base->hdr = params->hdr;
190 if (bootproto >= 0x0204)
191 kernel_size = hdr->syssize * 16;
193 kernel_size -= setup_size;
195 if (bootproto == 0x0100) {
197 * A very old kernel MUST have its real-mode code
200 if ((ulong)setup_base != 0x90000) {
201 /* Copy the real-mode kernel */
202 memmove((void *)0x90000, setup_base, setup_size);
204 /* Copy the command line */
205 memmove((void *)0x99000,
206 (u8 *)setup_base + COMMAND_LINE_OFFSET,
210 setup_base = (struct boot_params *)0x90000;
213 /* It is recommended to clear memory up to the 32K mark */
214 memset((u8 *)0x90000 + setup_size, 0,
215 SETUP_MAX_SIZE - setup_size);
219 if (kernel_size > BZIMAGE_MAX_SIZE) {
220 printf("Error: bzImage kernel too big! "
221 "(size: %ld, max: %d)\n",
222 kernel_size, BZIMAGE_MAX_SIZE);
225 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
226 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
227 kernel_size, ZIMAGE_MAX_SIZE);
231 printf("Loading %s at address %lx (%ld bytes)\n",
232 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
234 memmove((void *)*load_addressp, image + setup_size, kernel_size);
239 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
240 unsigned long initrd_addr, unsigned long initrd_size)
242 struct setup_header *hdr = &setup_base->hdr;
243 int bootproto = get_boot_protocol(hdr);
245 setup_base->e820_entries = install_e820_map(
246 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
248 if (bootproto == 0x0100) {
249 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
250 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
252 if (bootproto >= 0x0200) {
253 hdr->type_of_loader = 8;
256 printf("Initial RAM disk at linear address "
257 "0x%08lx, size %ld bytes\n",
258 initrd_addr, initrd_size);
260 hdr->ramdisk_image = initrd_addr;
261 hdr->ramdisk_size = initrd_size;
265 if (bootproto >= 0x0201) {
266 hdr->heap_end_ptr = HEAP_END_OFFSET;
267 hdr->loadflags |= HEAP_FLAG;
271 if (bootproto >= 0x0202) {
272 hdr->cmd_line_ptr = (uintptr_t)cmd_line;
273 } else if (bootproto >= 0x0200) {
274 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
275 setup_base->screen_info.cl_offset =
276 (uintptr_t)cmd_line - (uintptr_t)setup_base;
278 hdr->setup_move_size = 0x9100;
281 /* build command line at COMMAND_LINE_OFFSET */
282 build_command_line(cmd_line, auto_boot);
285 #ifdef CONFIG_INTEL_MID
286 if (bootproto >= 0x0207)
287 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
290 #ifdef CONFIG_GENERATE_ACPI_TABLE
291 if (bootproto >= 0x020e)
292 hdr->acpi_rsdp_addr = acpi_get_rsdp_addr();
295 setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
296 setup_video(&setup_base->screen_info);
298 #ifdef CONFIG_EFI_STUB
299 setup_efi_info(&setup_base->efi_info);
305 void setup_pcat_compatibility(void)
306 __attribute__((weak, alias("__setup_pcat_compatibility")));
308 void __setup_pcat_compatibility(void)
312 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
314 struct boot_params *base_ptr;
315 void *bzImage_addr = NULL;
318 ulong bzImage_size = 0;
319 ulong initrd_addr = 0;
320 ulong initrd_size = 0;
322 disable_interrupts();
324 /* Setup board for maximum PC/AT Compatibility */
325 setup_pcat_compatibility();
328 /* argv[1] holds the address of the bzImage */
331 s = env_get("fileaddr");
335 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
338 /* argv[2] holds the size of the bzImage */
339 bzImage_size = simple_strtoul(argv[2], NULL, 16);
343 initrd_addr = simple_strtoul(argv[3], NULL, 16);
345 initrd_size = simple_strtoul(argv[4], NULL, 16);
348 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
351 puts("## Kernel loading failed ...\n");
354 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
355 0, initrd_addr, initrd_size)) {
356 puts("Setting up boot parameters failed ...\n");
360 /* we assume that the kernel is in place */
361 return boot_linux_kernel((ulong)base_ptr, load_address, false);
365 zboot, 5, 0, do_zboot,
367 "[addr] [size] [initrd addr] [initrd size]\n"
368 " addr - The optional starting address of the bzimage.\n"
369 " If not set it defaults to the environment\n"
370 " variable \"fileaddr\".\n"
371 " size - The optional size of the bzimage. Defaults to\n"
373 " initrd addr - The address of the initrd image to use, if any.\n"
374 " initrd size - The size of the initrd image to use, if any.\n"