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1 | /* | |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * (C) Copyright 2002 | |
4 | * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> | |
5 | * | |
6 | * SPDX-License-Identifier: GPL-2.0+ | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Linux x86 zImage and bzImage loading | |
11 | * | |
12 | * based on the procdure described in | |
13 | * linux/Documentation/i386/boot.txt | |
14 | */ | |
15 | ||
16 | #include <common.h> | |
17 | #include <asm/io.h> | |
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> | |
25 | #endif | |
26 | #include <linux/compiler.h> | |
27 | ||
28 | DECLARE_GLOBAL_DATA_PTR; | |
29 | ||
30 | /* | |
31 | * Memory lay-out: | |
32 | * | |
33 | * relative to setup_base (which is 0x90000 currently) | |
34 | * | |
35 | * 0x0000-0x7FFF Real mode kernel | |
36 | * 0x8000-0x8FFF Stack and heap | |
37 | * 0x9000-0x90FF Kernel command line | |
38 | */ | |
39 | #define DEFAULT_SETUP_BASE 0x90000 | |
40 | #define COMMAND_LINE_OFFSET 0x9000 | |
41 | #define HEAP_END_OFFSET 0x8e00 | |
42 | ||
43 | #define COMMAND_LINE_SIZE 2048 | |
44 | ||
45 | static void build_command_line(char *command_line, int auto_boot) | |
46 | { | |
47 | char *env_command_line; | |
48 | ||
49 | command_line[0] = '\0'; | |
50 | ||
51 | env_command_line = env_get("bootargs"); | |
52 | ||
53 | /* set console= argument if we use a serial console */ | |
54 | if (!strstr(env_command_line, "console=")) { | |
55 | if (!strcmp(env_get("stdout"), "serial")) { | |
56 | ||
57 | /* We seem to use serial console */ | |
58 | sprintf(command_line, "console=ttyS0,%s ", | |
59 | env_get("baudrate")); | |
60 | } | |
61 | } | |
62 | ||
63 | if (auto_boot) | |
64 | strcat(command_line, "auto "); | |
65 | ||
66 | if (env_command_line) | |
67 | strcat(command_line, env_command_line); | |
68 | ||
69 | printf("Kernel command line: \"%s\"\n", command_line); | |
70 | } | |
71 | ||
72 | static int kernel_magic_ok(struct setup_header *hdr) | |
73 | { | |
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); | |
78 | return 0; | |
79 | } else { | |
80 | printf("Valid Boot Flag\n"); | |
81 | return 1; | |
82 | } | |
83 | } | |
84 | ||
85 | static int get_boot_protocol(struct setup_header *hdr) | |
86 | { | |
87 | if (hdr->header == KERNEL_V2_MAGIC) { | |
88 | printf("Magic signature found\n"); | |
89 | return hdr->version; | |
90 | } else { | |
91 | /* Very old kernel */ | |
92 | printf("Magic signature not found\n"); | |
93 | return 0x0100; | |
94 | } | |
95 | } | |
96 | ||
97 | struct boot_params *load_zimage(char *image, unsigned long kernel_size, | |
98 | ulong *load_addressp) | |
99 | { | |
100 | struct boot_params *setup_base; | |
101 | int setup_size; | |
102 | int bootproto; | |
103 | int big_image; | |
104 | ||
105 | struct boot_params *params = (struct boot_params *)image; | |
106 | struct setup_header *hdr = ¶ms->hdr; | |
107 | ||
108 | /* base address for real-mode segment */ | |
109 | setup_base = (struct boot_params *)DEFAULT_SETUP_BASE; | |
110 | ||
111 | if (!kernel_magic_ok(hdr)) | |
112 | return 0; | |
113 | ||
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; | |
118 | } else { | |
119 | setup_size = (hdr->setup_sects + 1) * 512; | |
120 | } | |
121 | ||
122 | printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size); | |
123 | ||
124 | if (setup_size > SETUP_MAX_SIZE) | |
125 | printf("Error: Setup is too large (%d bytes)\n", setup_size); | |
126 | ||
127 | /* determine boot protocol version */ | |
128 | bootproto = get_boot_protocol(hdr); | |
129 | ||
130 | printf("Using boot protocol version %x.%02x\n", | |
131 | (bootproto & 0xff00) >> 8, bootproto & 0xff); | |
132 | ||
133 | if (bootproto >= 0x0200) { | |
134 | if (hdr->setup_sects >= 15) { | |
135 | printf("Linux kernel version %s\n", | |
136 | (char *)params + | |
137 | hdr->kernel_version + 0x200); | |
138 | } else { | |
139 | printf("Setup Sectors < 15 - " | |
140 | "Cannot print kernel version.\n"); | |
141 | } | |
142 | } | |
143 | ||
144 | /* Determine image type */ | |
145 | big_image = (bootproto >= 0x0200) && | |
146 | (hdr->loadflags & BIG_KERNEL_FLAG); | |
147 | ||
148 | /* Determine load address */ | |
149 | if (big_image) | |
150 | *load_addressp = BZIMAGE_LOAD_ADDR; | |
151 | else | |
152 | *load_addressp = ZIMAGE_LOAD_ADDR; | |
153 | ||
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; | |
157 | ||
158 | if (bootproto >= 0x0204) | |
159 | kernel_size = hdr->syssize * 16; | |
160 | else | |
161 | kernel_size -= setup_size; | |
162 | ||
163 | if (bootproto == 0x0100) { | |
164 | /* | |
165 | * A very old kernel MUST have its real-mode code | |
166 | * loaded at 0x90000 | |
167 | */ | |
168 | if ((ulong)setup_base != 0x90000) { | |
169 | /* Copy the real-mode kernel */ | |
170 | memmove((void *)0x90000, setup_base, setup_size); | |
171 | ||
172 | /* Copy the command line */ | |
173 | memmove((void *)0x99000, | |
174 | (u8 *)setup_base + COMMAND_LINE_OFFSET, | |
175 | COMMAND_LINE_SIZE); | |
176 | ||
177 | /* Relocated */ | |
178 | setup_base = (struct boot_params *)0x90000; | |
179 | } | |
180 | ||
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); | |
184 | } | |
185 | ||
186 | if (big_image) { | |
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); | |
191 | return 0; | |
192 | } | |
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); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | printf("Loading %s at address %lx (%ld bytes)\n", | |
200 | big_image ? "bzImage" : "zImage", *load_addressp, kernel_size); | |
201 | ||
202 | memmove((void *)*load_addressp, image + setup_size, kernel_size); | |
203 | ||
204 | return setup_base; | |
205 | } | |
206 | ||
207 | int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot, | |
208 | unsigned long initrd_addr, unsigned long initrd_size) | |
209 | { | |
210 | struct setup_header *hdr = &setup_base->hdr; | |
211 | int bootproto = get_boot_protocol(hdr); | |
212 | ||
213 | setup_base->e820_entries = install_e820_map( | |
214 | ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); | |
215 | ||
216 | if (bootproto == 0x0100) { | |
217 | setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; | |
218 | setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET; | |
219 | } | |
220 | if (bootproto >= 0x0200) { | |
221 | hdr->type_of_loader = 8; | |
222 | ||
223 | if (initrd_addr) { | |
224 | printf("Initial RAM disk at linear address " | |
225 | "0x%08lx, size %ld bytes\n", | |
226 | initrd_addr, initrd_size); | |
227 | ||
228 | hdr->ramdisk_image = initrd_addr; | |
229 | hdr->ramdisk_size = initrd_size; | |
230 | } | |
231 | } | |
232 | ||
233 | if (bootproto >= 0x0201) { | |
234 | hdr->heap_end_ptr = HEAP_END_OFFSET; | |
235 | hdr->loadflags |= HEAP_FLAG; | |
236 | } | |
237 | ||
238 | if (cmd_line) { | |
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; | |
245 | ||
246 | hdr->setup_move_size = 0x9100; | |
247 | } | |
248 | ||
249 | #if defined(CONFIG_INTEL_MID) | |
250 | hdr->hardware_subarch = X86_SUBARCH_INTEL_MID; | |
251 | #endif | |
252 | ||
253 | /* build command line at COMMAND_LINE_OFFSET */ | |
254 | build_command_line(cmd_line, auto_boot); | |
255 | } | |
256 | ||
257 | setup_video(&setup_base->screen_info); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | void setup_pcat_compatibility(void) | |
263 | __attribute__((weak, alias("__setup_pcat_compatibility"))); | |
264 | ||
265 | void __setup_pcat_compatibility(void) | |
266 | { | |
267 | } | |
268 | ||
269 | int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) | |
270 | { | |
271 | struct boot_params *base_ptr; | |
272 | void *bzImage_addr = NULL; | |
273 | ulong load_address; | |
274 | char *s; | |
275 | ulong bzImage_size = 0; | |
276 | ulong initrd_addr = 0; | |
277 | ulong initrd_size = 0; | |
278 | ||
279 | disable_interrupts(); | |
280 | ||
281 | /* Setup board for maximum PC/AT Compatibility */ | |
282 | setup_pcat_compatibility(); | |
283 | ||
284 | if (argc >= 2) { | |
285 | /* argv[1] holds the address of the bzImage */ | |
286 | s = argv[1]; | |
287 | } else { | |
288 | s = env_get("fileaddr"); | |
289 | } | |
290 | ||
291 | if (s) | |
292 | bzImage_addr = (void *)simple_strtoul(s, NULL, 16); | |
293 | ||
294 | if (argc >= 3) { | |
295 | /* argv[2] holds the size of the bzImage */ | |
296 | bzImage_size = simple_strtoul(argv[2], NULL, 16); | |
297 | } | |
298 | ||
299 | if (argc >= 4) | |
300 | initrd_addr = simple_strtoul(argv[3], NULL, 16); | |
301 | if (argc >= 5) | |
302 | initrd_size = simple_strtoul(argv[4], NULL, 16); | |
303 | ||
304 | /* Lets look for */ | |
305 | base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address); | |
306 | ||
307 | if (!base_ptr) { | |
308 | puts("## Kernel loading failed ...\n"); | |
309 | return -1; | |
310 | } | |
311 | if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET, | |
312 | 0, initrd_addr, initrd_size)) { | |
313 | puts("Setting up boot parameters failed ...\n"); | |
314 | return -1; | |
315 | } | |
316 | ||
317 | /* we assume that the kernel is in place */ | |
318 | return boot_linux_kernel((ulong)base_ptr, load_address, false); | |
319 | } | |
320 | ||
321 | U_BOOT_CMD( | |
322 | zboot, 5, 0, do_zboot, | |
323 | "Boot bzImage", | |
324 | "[addr] [size] [initrd addr] [initrd size]\n" | |
325 | " addr - The optional starting address of the bzimage.\n" | |
326 | " If not set it defaults to the environment\n" | |
327 | " variable \"fileaddr\".\n" | |
328 | " size - The optional size of the bzimage. Defaults to\n" | |
329 | " zero.\n" | |
330 | " initrd addr - The address of the initrd image to use, if any.\n" | |
331 | " initrd size - The size of the initrd image to use, if any.\n" | |
332 | ); |