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1/*
2 * misc.c
3 *
4 * This is a collection of several routines from gzip-1.0.3
5 * adapted for Linux.
6 *
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
8 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
9 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
10 */
11
12#include "misc.h"
13#include "../string.h"
14
15/* WARNING!!
16 * This code is compiled with -fPIC and it is relocated dynamically
17 * at run time, but no relocation processing is performed.
18 * This means that it is not safe to place pointers in static structures.
19 */
20
21/*
22 * Getting to provable safe in place decompression is hard.
23 * Worst case behaviours need to be analyzed.
24 * Background information:
25 *
26 * The file layout is:
27 * magic[2]
28 * method[1]
29 * flags[1]
30 * timestamp[4]
31 * extraflags[1]
32 * os[1]
33 * compressed data blocks[N]
34 * crc[4] orig_len[4]
35 *
36 * resulting in 18 bytes of non compressed data overhead.
37 *
38 * Files divided into blocks
39 * 1 bit (last block flag)
40 * 2 bits (block type)
41 *
42 * 1 block occurs every 32K -1 bytes or when there 50% compression
43 * has been achieved. The smallest block type encoding is always used.
44 *
45 * stored:
46 * 32 bits length in bytes.
47 *
48 * fixed:
49 * magic fixed tree.
50 * symbols.
51 *
52 * dynamic:
53 * dynamic tree encoding.
54 * symbols.
55 *
56 *
57 * The buffer for decompression in place is the length of the
58 * uncompressed data, plus a small amount extra to keep the algorithm safe.
59 * The compressed data is placed at the end of the buffer. The output
60 * pointer is placed at the start of the buffer and the input pointer
61 * is placed where the compressed data starts. Problems will occur
62 * when the output pointer overruns the input pointer.
63 *
64 * The output pointer can only overrun the input pointer if the input
65 * pointer is moving faster than the output pointer. A condition only
66 * triggered by data whose compressed form is larger than the uncompressed
67 * form.
68 *
69 * The worst case at the block level is a growth of the compressed data
70 * of 5 bytes per 32767 bytes.
71 *
72 * The worst case internal to a compressed block is very hard to figure.
73 * The worst case can at least be boundined by having one bit that represents
74 * 32764 bytes and then all of the rest of the bytes representing the very
75 * very last byte.
76 *
77 * All of which is enough to compute an amount of extra data that is required
78 * to be safe. To avoid problems at the block level allocating 5 extra bytes
79 * per 32767 bytes of data is sufficient. To avoind problems internal to a
80 * block adding an extra 32767 bytes (the worst case uncompressed block size)
81 * is sufficient, to ensure that in the worst case the decompressed data for
82 * block will stop the byte before the compressed data for a block begins.
83 * To avoid problems with the compressed data's meta information an extra 18
84 * bytes are needed. Leading to the formula:
85 *
86 * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
87 *
88 * Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
89 * Adding 32768 instead of 32767 just makes for round numbers.
90 * Adding the decompressor_size is necessary as it musht live after all
91 * of the data as well. Last I measured the decompressor is about 14K.
92 * 10K of actual data and 4K of bss.
93 *
94 */
95
96/*
97 * gzip declarations
98 */
99#define STATIC static
100
101#undef memcpy
102
103/*
104 * Use a normal definition of memset() from string.c. There are already
105 * included header files which expect a definition of memset() and by
106 * the time we define memset macro, it is too late.
107 */
108#undef memset
109#define memzero(s, n) memset((s), 0, (n))
110
111
112static void error(char *m);
113
114/*
115 * This is set up by the setup-routine at boot-time
116 */
117struct boot_params *real_mode; /* Pointer to real-mode data */
118
119memptr free_mem_ptr;
120memptr free_mem_end_ptr;
121
122static char *vidmem;
123static int vidport;
124static int lines, cols;
125
126#ifdef CONFIG_KERNEL_GZIP
127#include "../../../../lib/decompress_inflate.c"
128#endif
129
130#ifdef CONFIG_KERNEL_BZIP2
131#include "../../../../lib/decompress_bunzip2.c"
132#endif
133
134#ifdef CONFIG_KERNEL_LZMA
135#include "../../../../lib/decompress_unlzma.c"
136#endif
137
138#ifdef CONFIG_KERNEL_XZ
139#include "../../../../lib/decompress_unxz.c"
140#endif
141
142#ifdef CONFIG_KERNEL_LZO
143#include "../../../../lib/decompress_unlzo.c"
144#endif
145
146#ifdef CONFIG_KERNEL_LZ4
147#include "../../../../lib/decompress_unlz4.c"
148#endif
149
150static void scroll(void)
151{
152 int i;
153
154 memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
155 for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
156 vidmem[i] = ' ';
157}
158
159#define XMTRDY 0x20
160
161#define TXR 0 /* Transmit register (WRITE) */
162#define LSR 5 /* Line Status */
163static void serial_putchar(int ch)
164{
165 unsigned timeout = 0xffff;
166
167 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
168 cpu_relax();
169
170 outb(ch, early_serial_base + TXR);
171}
172
173void __putstr(const char *s)
174{
175 int x, y, pos;
176 char c;
177
178 if (early_serial_base) {
179 const char *str = s;
180 while (*str) {
181 if (*str == '\n')
182 serial_putchar('\r');
183 serial_putchar(*str++);
184 }
185 }
186
187 if (real_mode->screen_info.orig_video_mode == 0 &&
188 lines == 0 && cols == 0)
189 return;
190
191 x = real_mode->screen_info.orig_x;
192 y = real_mode->screen_info.orig_y;
193
194 while ((c = *s++) != '\0') {
195 if (c == '\n') {
196 x = 0;
197 if (++y >= lines) {
198 scroll();
199 y--;
200 }
201 } else {
202 vidmem[(x + cols * y) * 2] = c;
203 if (++x >= cols) {
204 x = 0;
205 if (++y >= lines) {
206 scroll();
207 y--;
208 }
209 }
210 }
211 }
212
213 real_mode->screen_info.orig_x = x;
214 real_mode->screen_info.orig_y = y;
215
216 pos = (x + cols * y) * 2; /* Update cursor position */
217 outb(14, vidport);
218 outb(0xff & (pos >> 9), vidport+1);
219 outb(15, vidport);
220 outb(0xff & (pos >> 1), vidport+1);
221}
222
223static void error(char *x)
224{
225 error_putstr("\n\n");
226 error_putstr(x);
227 error_putstr("\n\n -- System halted");
228
229 while (1)
230 asm("hlt");
231}
232
233#if CONFIG_X86_NEED_RELOCS
234static void handle_relocations(void *output, unsigned long output_len)
235{
236 int *reloc;
237 unsigned long delta, map, ptr;
238 unsigned long min_addr = (unsigned long)output;
239 unsigned long max_addr = min_addr + output_len;
240
241 /*
242 * Calculate the delta between where vmlinux was linked to load
243 * and where it was actually loaded.
244 */
245 delta = min_addr - LOAD_PHYSICAL_ADDR;
246 if (!delta) {
247 debug_putstr("No relocation needed... ");
248 return;
249 }
250 debug_putstr("Performing relocations... ");
251
252 /*
253 * The kernel contains a table of relocation addresses. Those
254 * addresses have the final load address of the kernel in virtual
255 * memory. We are currently working in the self map. So we need to
256 * create an adjustment for kernel memory addresses to the self map.
257 * This will involve subtracting out the base address of the kernel.
258 */
259 map = delta - __START_KERNEL_map;
260
261 /*
262 * Process relocations: 32 bit relocations first then 64 bit after.
263 * Two sets of binary relocations are added to the end of the kernel
264 * before compression. Each relocation table entry is the kernel
265 * address of the location which needs to be updated stored as a
266 * 32-bit value which is sign extended to 64 bits.
267 *
268 * Format is:
269 *
270 * kernel bits...
271 * 0 - zero terminator for 64 bit relocations
272 * 64 bit relocation repeated
273 * 0 - zero terminator for 32 bit relocations
274 * 32 bit relocation repeated
275 *
276 * So we work backwards from the end of the decompressed image.
277 */
278 for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
279 int extended = *reloc;
280 extended += map;
281
282 ptr = (unsigned long)extended;
283 if (ptr < min_addr || ptr > max_addr)
284 error("32-bit relocation outside of kernel!\n");
285
286 *(uint32_t *)ptr += delta;
287 }
288#ifdef CONFIG_X86_64
289 for (reloc--; *reloc; reloc--) {
290 long extended = *reloc;
291 extended += map;
292
293 ptr = (unsigned long)extended;
294 if (ptr < min_addr || ptr > max_addr)
295 error("64-bit relocation outside of kernel!\n");
296
297 *(uint64_t *)ptr += delta;
298 }
299#endif
300}
301#else
302static inline void handle_relocations(void *output, unsigned long output_len)
303{ }
304#endif
305
306static void parse_elf(void *output)
307{
308#ifdef CONFIG_X86_64
309 Elf64_Ehdr ehdr;
310 Elf64_Phdr *phdrs, *phdr;
311#else
312 Elf32_Ehdr ehdr;
313 Elf32_Phdr *phdrs, *phdr;
314#endif
315 void *dest;
316 int i;
317
318 memcpy(&ehdr, output, sizeof(ehdr));
319 if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
320 ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
321 ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
322 ehdr.e_ident[EI_MAG3] != ELFMAG3) {
323 error("Kernel is not a valid ELF file");
324 return;
325 }
326
327 debug_putstr("Parsing ELF... ");
328
329 phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
330 if (!phdrs)
331 error("Failed to allocate space for phdrs");
332
333 memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
334
335 for (i = 0; i < ehdr.e_phnum; i++) {
336 phdr = &phdrs[i];
337
338 switch (phdr->p_type) {
339 case PT_LOAD:
340#ifdef CONFIG_RELOCATABLE
341 dest = output;
342 dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
343#else
344 dest = (void *)(phdr->p_paddr);
345#endif
346 memcpy(dest,
347 output + phdr->p_offset,
348 phdr->p_filesz);
349 break;
350 default: /* Ignore other PT_* */ break;
351 }
352 }
353
354 free(phdrs);
355}
356
357asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
358 unsigned char *input_data,
359 unsigned long input_len,
360 unsigned char *output,
361 unsigned long output_len)
362{
363 real_mode = rmode;
364
365 sanitize_boot_params(real_mode);
366
367 if (real_mode->screen_info.orig_video_mode == 7) {
368 vidmem = (char *) 0xb0000;
369 vidport = 0x3b4;
370 } else {
371 vidmem = (char *) 0xb8000;
372 vidport = 0x3d4;
373 }
374
375 lines = real_mode->screen_info.orig_video_lines;
376 cols = real_mode->screen_info.orig_video_cols;
377
378 console_init();
379 debug_putstr("early console in decompress_kernel\n");
380
381 free_mem_ptr = heap; /* Heap */
382 free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
383
384 output = choose_kernel_location(input_data, input_len,
385 output, output_len);
386
387 /* Validate memory location choices. */
388 if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
389 error("Destination address inappropriately aligned");
390#ifdef CONFIG_X86_64
391 if (heap > 0x3fffffffffffUL)
392 error("Destination address too large");
393#else
394 if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
395 error("Destination address too large");
396#endif
397#ifndef CONFIG_RELOCATABLE
398 if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
399 error("Wrong destination address");
400#endif
401
402 debug_putstr("\nDecompressing Linux... ");
403 decompress(input_data, input_len, NULL, NULL, output, NULL, error);
404 parse_elf(output);
405 handle_relocations(output, output_len);
406 debug_putstr("done.\nBooting the kernel.\n");
407 return output;
408}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * misc.c
4 *
5 * This is a collection of several routines used to extract the kernel
6 * which includes KASLR relocation, decompression, ELF parsing, and
7 * relocation processing. Additionally included are the screen and serial
8 * output functions and related debugging support functions.
9 *
10 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
11 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
12 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
13 */
14
15#include "misc.h"
16#include "error.h"
17#include "pgtable.h"
18#include "../string.h"
19#include "../voffset.h"
20#include <asm/bootparam_utils.h>
21
22/*
23 * WARNING!!
24 * This code is compiled with -fPIC and it is relocated dynamically at
25 * run time, but no relocation processing is performed. This means that
26 * it is not safe to place pointers in static structures.
27 */
28
29/* Macros used by the included decompressor code below. */
30#define STATIC static
31/* Define an externally visible malloc()/free(). */
32#define MALLOC_VISIBLE
33#include <linux/decompress/mm.h>
34
35/*
36 * Provide definitions of memzero and memmove as some of the decompressors will
37 * try to define their own functions if these are not defined as macros.
38 */
39#define memzero(s, n) memset((s), 0, (n))
40#ifndef memmove
41#define memmove memmove
42/* Functions used by the included decompressor code below. */
43void *memmove(void *dest, const void *src, size_t n);
44#endif
45
46/*
47 * This is set up by the setup-routine at boot-time
48 */
49struct boot_params *boot_params;
50
51struct port_io_ops pio_ops;
52
53memptr free_mem_ptr;
54memptr free_mem_end_ptr;
55
56static char *vidmem;
57static int vidport;
58
59/* These might be accessed before .bss is cleared, so use .data instead. */
60static int lines __section(".data");
61static int cols __section(".data");
62
63#ifdef CONFIG_KERNEL_GZIP
64#include "../../../../lib/decompress_inflate.c"
65#endif
66
67#ifdef CONFIG_KERNEL_BZIP2
68#include "../../../../lib/decompress_bunzip2.c"
69#endif
70
71#ifdef CONFIG_KERNEL_LZMA
72#include "../../../../lib/decompress_unlzma.c"
73#endif
74
75#ifdef CONFIG_KERNEL_XZ
76#include "../../../../lib/decompress_unxz.c"
77#endif
78
79#ifdef CONFIG_KERNEL_LZO
80#include "../../../../lib/decompress_unlzo.c"
81#endif
82
83#ifdef CONFIG_KERNEL_LZ4
84#include "../../../../lib/decompress_unlz4.c"
85#endif
86
87#ifdef CONFIG_KERNEL_ZSTD
88#include "../../../../lib/decompress_unzstd.c"
89#endif
90/*
91 * NOTE: When adding a new decompressor, please update the analysis in
92 * ../header.S.
93 */
94
95static void scroll(void)
96{
97 int i;
98
99 memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
100 for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
101 vidmem[i] = ' ';
102}
103
104#define XMTRDY 0x20
105
106#define TXR 0 /* Transmit register (WRITE) */
107#define LSR 5 /* Line Status */
108static void serial_putchar(int ch)
109{
110 unsigned timeout = 0xffff;
111
112 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
113 cpu_relax();
114
115 outb(ch, early_serial_base + TXR);
116}
117
118void __putstr(const char *s)
119{
120 int x, y, pos;
121 char c;
122
123 if (early_serial_base) {
124 const char *str = s;
125 while (*str) {
126 if (*str == '\n')
127 serial_putchar('\r');
128 serial_putchar(*str++);
129 }
130 }
131
132 if (lines == 0 || cols == 0)
133 return;
134
135 x = boot_params->screen_info.orig_x;
136 y = boot_params->screen_info.orig_y;
137
138 while ((c = *s++) != '\0') {
139 if (c == '\n') {
140 x = 0;
141 if (++y >= lines) {
142 scroll();
143 y--;
144 }
145 } else {
146 vidmem[(x + cols * y) * 2] = c;
147 if (++x >= cols) {
148 x = 0;
149 if (++y >= lines) {
150 scroll();
151 y--;
152 }
153 }
154 }
155 }
156
157 boot_params->screen_info.orig_x = x;
158 boot_params->screen_info.orig_y = y;
159
160 pos = (x + cols * y) * 2; /* Update cursor position */
161 outb(14, vidport);
162 outb(0xff & (pos >> 9), vidport+1);
163 outb(15, vidport);
164 outb(0xff & (pos >> 1), vidport+1);
165}
166
167void __puthex(unsigned long value)
168{
169 char alpha[2] = "0";
170 int bits;
171
172 for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
173 unsigned long digit = (value >> bits) & 0xf;
174
175 if (digit < 0xA)
176 alpha[0] = '0' + digit;
177 else
178 alpha[0] = 'a' + (digit - 0xA);
179
180 __putstr(alpha);
181 }
182}
183
184#ifdef CONFIG_X86_NEED_RELOCS
185static void handle_relocations(void *output, unsigned long output_len,
186 unsigned long virt_addr)
187{
188 int *reloc;
189 unsigned long delta, map, ptr;
190 unsigned long min_addr = (unsigned long)output;
191 unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
192
193 /*
194 * Calculate the delta between where vmlinux was linked to load
195 * and where it was actually loaded.
196 */
197 delta = min_addr - LOAD_PHYSICAL_ADDR;
198
199 /*
200 * The kernel contains a table of relocation addresses. Those
201 * addresses have the final load address of the kernel in virtual
202 * memory. We are currently working in the self map. So we need to
203 * create an adjustment for kernel memory addresses to the self map.
204 * This will involve subtracting out the base address of the kernel.
205 */
206 map = delta - __START_KERNEL_map;
207
208 /*
209 * 32-bit always performs relocations. 64-bit relocations are only
210 * needed if KASLR has chosen a different starting address offset
211 * from __START_KERNEL_map.
212 */
213 if (IS_ENABLED(CONFIG_X86_64))
214 delta = virt_addr - LOAD_PHYSICAL_ADDR;
215
216 if (!delta) {
217 debug_putstr("No relocation needed... ");
218 return;
219 }
220 debug_putstr("Performing relocations... ");
221
222 /*
223 * Process relocations: 32 bit relocations first then 64 bit after.
224 * Three sets of binary relocations are added to the end of the kernel
225 * before compression. Each relocation table entry is the kernel
226 * address of the location which needs to be updated stored as a
227 * 32-bit value which is sign extended to 64 bits.
228 *
229 * Format is:
230 *
231 * kernel bits...
232 * 0 - zero terminator for 64 bit relocations
233 * 64 bit relocation repeated
234 * 0 - zero terminator for inverse 32 bit relocations
235 * 32 bit inverse relocation repeated
236 * 0 - zero terminator for 32 bit relocations
237 * 32 bit relocation repeated
238 *
239 * So we work backwards from the end of the decompressed image.
240 */
241 for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
242 long extended = *reloc;
243 extended += map;
244
245 ptr = (unsigned long)extended;
246 if (ptr < min_addr || ptr > max_addr)
247 error("32-bit relocation outside of kernel!\n");
248
249 *(uint32_t *)ptr += delta;
250 }
251#ifdef CONFIG_X86_64
252 while (*--reloc) {
253 long extended = *reloc;
254 extended += map;
255
256 ptr = (unsigned long)extended;
257 if (ptr < min_addr || ptr > max_addr)
258 error("inverse 32-bit relocation outside of kernel!\n");
259
260 *(int32_t *)ptr -= delta;
261 }
262 for (reloc--; *reloc; reloc--) {
263 long extended = *reloc;
264 extended += map;
265
266 ptr = (unsigned long)extended;
267 if (ptr < min_addr || ptr > max_addr)
268 error("64-bit relocation outside of kernel!\n");
269
270 *(uint64_t *)ptr += delta;
271 }
272#endif
273}
274#else
275static inline void handle_relocations(void *output, unsigned long output_len,
276 unsigned long virt_addr)
277{ }
278#endif
279
280static void parse_elf(void *output)
281{
282#ifdef CONFIG_X86_64
283 Elf64_Ehdr ehdr;
284 Elf64_Phdr *phdrs, *phdr;
285#else
286 Elf32_Ehdr ehdr;
287 Elf32_Phdr *phdrs, *phdr;
288#endif
289 void *dest;
290 int i;
291
292 memcpy(&ehdr, output, sizeof(ehdr));
293 if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
294 ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
295 ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
296 ehdr.e_ident[EI_MAG3] != ELFMAG3) {
297 error("Kernel is not a valid ELF file");
298 return;
299 }
300
301 debug_putstr("Parsing ELF... ");
302
303 phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
304 if (!phdrs)
305 error("Failed to allocate space for phdrs");
306
307 memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
308
309 for (i = 0; i < ehdr.e_phnum; i++) {
310 phdr = &phdrs[i];
311
312 switch (phdr->p_type) {
313 case PT_LOAD:
314#ifdef CONFIG_X86_64
315 if ((phdr->p_align % 0x200000) != 0)
316 error("Alignment of LOAD segment isn't multiple of 2MB");
317#endif
318#ifdef CONFIG_RELOCATABLE
319 dest = output;
320 dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
321#else
322 dest = (void *)(phdr->p_paddr);
323#endif
324 memmove(dest, output + phdr->p_offset, phdr->p_filesz);
325 break;
326 default: /* Ignore other PT_* */ break;
327 }
328 }
329
330 free(phdrs);
331}
332
333/*
334 * The compressed kernel image (ZO), has been moved so that its position
335 * is against the end of the buffer used to hold the uncompressed kernel
336 * image (VO) and the execution environment (.bss, .brk), which makes sure
337 * there is room to do the in-place decompression. (See header.S for the
338 * calculations.)
339 *
340 * |-----compressed kernel image------|
341 * V V
342 * 0 extract_offset +INIT_SIZE
343 * |-----------|---------------|-------------------------|--------|
344 * | | | |
345 * VO__text startup_32 of ZO VO__end ZO__end
346 * ^ ^
347 * |-------uncompressed kernel image---------|
348 *
349 */
350asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
351 unsigned char *input_data,
352 unsigned long input_len,
353 unsigned char *output,
354 unsigned long output_len)
355{
356 const unsigned long kernel_total_size = VO__end - VO__text;
357 unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
358 unsigned long needed_size;
359
360 /* Retain x86 boot parameters pointer passed from startup_32/64. */
361 boot_params = rmode;
362
363 /* Clear flags intended for solely in-kernel use. */
364 boot_params->hdr.loadflags &= ~KASLR_FLAG;
365
366 sanitize_boot_params(boot_params);
367
368 if (boot_params->screen_info.orig_video_mode == 7) {
369 vidmem = (char *) 0xb0000;
370 vidport = 0x3b4;
371 } else {
372 vidmem = (char *) 0xb8000;
373 vidport = 0x3d4;
374 }
375
376 lines = boot_params->screen_info.orig_video_lines;
377 cols = boot_params->screen_info.orig_video_cols;
378
379 init_default_io_ops();
380
381 /*
382 * Detect TDX guest environment.
383 *
384 * It has to be done before console_init() in order to use
385 * paravirtualized port I/O operations if needed.
386 */
387 early_tdx_detect();
388
389 console_init();
390
391 /*
392 * Save RSDP address for later use. Have this after console_init()
393 * so that early debugging output from the RSDP parsing code can be
394 * collected.
395 */
396 boot_params->acpi_rsdp_addr = get_rsdp_addr();
397
398 debug_putstr("early console in extract_kernel\n");
399
400 free_mem_ptr = heap; /* Heap */
401 free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
402
403 /*
404 * The memory hole needed for the kernel is the larger of either
405 * the entire decompressed kernel plus relocation table, or the
406 * entire decompressed kernel plus .bss and .brk sections.
407 *
408 * On X86_64, the memory is mapped with PMD pages. Round the
409 * size up so that the full extent of PMD pages mapped is
410 * included in the check against the valid memory table
411 * entries. This ensures the full mapped area is usable RAM
412 * and doesn't include any reserved areas.
413 */
414 needed_size = max(output_len, kernel_total_size);
415#ifdef CONFIG_X86_64
416 needed_size = ALIGN(needed_size, MIN_KERNEL_ALIGN);
417#endif
418
419 /* Report initial kernel position details. */
420 debug_putaddr(input_data);
421 debug_putaddr(input_len);
422 debug_putaddr(output);
423 debug_putaddr(output_len);
424 debug_putaddr(kernel_total_size);
425 debug_putaddr(needed_size);
426
427#ifdef CONFIG_X86_64
428 /* Report address of 32-bit trampoline */
429 debug_putaddr(trampoline_32bit);
430#endif
431
432 choose_random_location((unsigned long)input_data, input_len,
433 (unsigned long *)&output,
434 needed_size,
435 &virt_addr);
436
437 /* Validate memory location choices. */
438 if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
439 error("Destination physical address inappropriately aligned");
440 if (virt_addr & (MIN_KERNEL_ALIGN - 1))
441 error("Destination virtual address inappropriately aligned");
442#ifdef CONFIG_X86_64
443 if (heap > 0x3fffffffffffUL)
444 error("Destination address too large");
445 if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
446 error("Destination virtual address is beyond the kernel mapping area");
447#else
448 if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
449 error("Destination address too large");
450#endif
451#ifndef CONFIG_RELOCATABLE
452 if (virt_addr != LOAD_PHYSICAL_ADDR)
453 error("Destination virtual address changed when not relocatable");
454#endif
455
456 debug_putstr("\nDecompressing Linux... ");
457 __decompress(input_data, input_len, NULL, NULL, output, output_len,
458 NULL, error);
459 parse_elf(output);
460 handle_relocations(output, output_len, virt_addr);
461 debug_putstr("done.\nBooting the kernel.\n");
462
463 /* Disable exception handling before booting the kernel */
464 cleanup_exception_handling();
465
466 return output;
467}
468
469void fortify_panic(const char *name)
470{
471 error("detected buffer overflow");
472}