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
46 * Install a default e820 table with 3 entries as follows:
48 * 0x000000-0x0a0000 Useable RAM
49 * 0x0a0000-0x100000 Reserved for ISA
50 * 0x100000-gd->ram_size Useable RAM
52 __weak unsigned install_e820_map(unsigned max_entries,
53 struct e820entry *entries)
56 entries[0].size = ISA_START_ADDRESS;
57 entries[0].type = E820_RAM;
58 entries[1].addr = ISA_START_ADDRESS;
59 entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
60 entries[1].type = E820_RESERVED;
61 entries[2].addr = ISA_END_ADDRESS;
62 entries[2].size = gd->ram_size - ISA_END_ADDRESS;
63 entries[2].type = E820_RAM;
64 entries[3].addr = CONFIG_PCIE_ECAM_BASE;
65 entries[3].size = CONFIG_PCIE_ECAM_SIZE;
66 entries[3].type = E820_RESERVED;
71 static void build_command_line(char *command_line, int auto_boot)
73 char *env_command_line;
75 command_line[0] = '\0';
77 env_command_line = getenv("bootargs");
79 /* set console= argument if we use a serial console */
80 if (!strstr(env_command_line, "console=")) {
81 if (!strcmp(getenv("stdout"), "serial")) {
83 /* We seem to use serial console */
84 sprintf(command_line, "console=ttyS0,%s ",
90 strcat(command_line, "auto ");
93 strcat(command_line, env_command_line);
95 printf("Kernel command line: \"%s\"\n", command_line);
98 static int kernel_magic_ok(struct setup_header *hdr)
100 if (KERNEL_MAGIC != hdr->boot_flag) {
101 printf("Error: Invalid Boot Flag "
102 "(found 0x%04x, expected 0x%04x)\n",
103 hdr->boot_flag, KERNEL_MAGIC);
106 printf("Valid Boot Flag\n");
111 static int get_boot_protocol(struct setup_header *hdr)
113 if (hdr->header == KERNEL_V2_MAGIC) {
114 printf("Magic signature found\n");
117 /* Very old kernel */
118 printf("Magic signature not found\n");
123 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
124 ulong *load_addressp)
126 struct boot_params *setup_base;
131 struct boot_params *params = (struct boot_params *)image;
132 struct setup_header *hdr = ¶ms->hdr;
134 /* base address for real-mode segment */
135 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
137 if (!kernel_magic_ok(hdr))
140 /* determine size of setup */
141 if (0 == hdr->setup_sects) {
142 printf("Setup Sectors = 0 (defaulting to 4)\n");
143 setup_size = 5 * 512;
145 setup_size = (hdr->setup_sects + 1) * 512;
148 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
150 if (setup_size > SETUP_MAX_SIZE)
151 printf("Error: Setup is too large (%d bytes)\n", setup_size);
153 /* determine boot protocol version */
154 bootproto = get_boot_protocol(hdr);
156 printf("Using boot protocol version %x.%02x\n",
157 (bootproto & 0xff00) >> 8, bootproto & 0xff);
159 if (bootproto >= 0x0200) {
160 if (hdr->setup_sects >= 15) {
161 printf("Linux kernel version %s\n",
163 hdr->kernel_version + 0x200);
165 printf("Setup Sectors < 15 - "
166 "Cannot print kernel version.\n");
170 /* Determine image type */
171 big_image = (bootproto >= 0x0200) &&
172 (hdr->loadflags & BIG_KERNEL_FLAG);
174 /* Determine load address */
176 *load_addressp = BZIMAGE_LOAD_ADDR;
178 *load_addressp = ZIMAGE_LOAD_ADDR;
180 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
181 memset(setup_base, 0, sizeof(*setup_base));
182 setup_base->hdr = params->hdr;
184 if (bootproto >= 0x0204)
185 kernel_size = hdr->syssize * 16;
187 kernel_size -= setup_size;
189 if (bootproto == 0x0100) {
191 * A very old kernel MUST have its real-mode code
194 if ((u32)setup_base != 0x90000) {
195 /* Copy the real-mode kernel */
196 memmove((void *)0x90000, setup_base, setup_size);
198 /* Copy the command line */
199 memmove((void *)0x99000,
200 (u8 *)setup_base + COMMAND_LINE_OFFSET,
204 setup_base = (struct boot_params *)0x90000;
207 /* It is recommended to clear memory up to the 32K mark */
208 memset((u8 *)0x90000 + setup_size, 0,
209 SETUP_MAX_SIZE - setup_size);
213 if (kernel_size > BZIMAGE_MAX_SIZE) {
214 printf("Error: bzImage kernel too big! "
215 "(size: %ld, max: %d)\n",
216 kernel_size, BZIMAGE_MAX_SIZE);
219 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
220 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
221 kernel_size, ZIMAGE_MAX_SIZE);
225 printf("Loading %s at address %lx (%ld bytes)\n",
226 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
228 memmove((void *)*load_addressp, image + setup_size, kernel_size);
233 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
234 unsigned long initrd_addr, unsigned long initrd_size)
236 struct setup_header *hdr = &setup_base->hdr;
237 int bootproto = get_boot_protocol(hdr);
239 setup_base->e820_entries = install_e820_map(
240 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
242 if (bootproto == 0x0100) {
243 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
244 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
246 if (bootproto >= 0x0200) {
247 hdr->type_of_loader = 8;
250 printf("Initial RAM disk at linear address "
251 "0x%08lx, size %ld bytes\n",
252 initrd_addr, initrd_size);
254 hdr->ramdisk_image = initrd_addr;
255 hdr->ramdisk_size = initrd_size;
259 if (bootproto >= 0x0201) {
260 hdr->heap_end_ptr = HEAP_END_OFFSET;
261 hdr->loadflags |= HEAP_FLAG;
265 if (bootproto >= 0x0202) {
266 hdr->cmd_line_ptr = (uintptr_t)cmd_line;
267 } else if (bootproto >= 0x0200) {
268 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
269 setup_base->screen_info.cl_offset =
270 (uintptr_t)cmd_line - (uintptr_t)setup_base;
272 hdr->setup_move_size = 0x9100;
275 /* build command line at COMMAND_LINE_OFFSET */
276 build_command_line(cmd_line, auto_boot);
279 setup_video(&setup_base->screen_info);
284 void setup_pcat_compatibility(void)
285 __attribute__((weak, alias("__setup_pcat_compatibility")));
287 void __setup_pcat_compatibility(void)
291 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
293 struct boot_params *base_ptr;
294 void *bzImage_addr = NULL;
297 ulong bzImage_size = 0;
298 ulong initrd_addr = 0;
299 ulong initrd_size = 0;
301 disable_interrupts();
303 /* Setup board for maximum PC/AT Compatibility */
304 setup_pcat_compatibility();
307 /* argv[1] holds the address of the bzImage */
310 s = getenv("fileaddr");
314 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
317 /* argv[2] holds the size of the bzImage */
318 bzImage_size = simple_strtoul(argv[2], NULL, 16);
322 initrd_addr = simple_strtoul(argv[3], NULL, 16);
324 initrd_size = simple_strtoul(argv[4], NULL, 16);
327 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
330 puts("## Kernel loading failed ...\n");
333 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
334 0, initrd_addr, initrd_size)) {
335 puts("Setting up boot parameters failed ...\n");
339 /* we assume that the kernel is in place */
340 return boot_linux_kernel((ulong)base_ptr, load_address, false);
344 zboot, 5, 0, do_zboot,
346 "[addr] [size] [initrd addr] [initrd size]\n"
347 " addr - The optional starting address of the bzimage.\n"
348 " If not set it defaults to the environment\n"
349 " variable \"fileaddr\".\n"
350 " size - The optional size of the bzimage. Defaults to\n"
352 " initrd addr - The address of the initrd image to use, if any.\n"
353 " initrd size - The size of the initrd image to use, if any.\n"