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x86, boot: determine compressed code offset at compile time
Determine the compressed code offset (from the kernel runtime address) at compile time. This allows some minor optimizations in arch/x86/boot/compressed/head_*.S, but more importantly it makes this value available to the build process, which will enable a future patch to export the necessary linear memory footprint into the bzImage header. [ Impact: cleanup, future patch enabling ] Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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H. Peter Anvin
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May 9, 2009
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* ----------------------------------------------------------------------- * | ||
| * | ||
| * Copyright (C) 2009 Intel Corporation. All rights reserved. | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License version | ||
| * 2 as published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
| * 02110-1301, USA. | ||
| * | ||
| * H. Peter Anvin <hpa@linux.intel.com> | ||
| * | ||
| * ----------------------------------------------------------------------- */ | ||
|
|
||
| /* | ||
| * Compute the desired load offset from a compressed program; outputs | ||
| * a small assembly wrapper with the appropriate symbols defined. | ||
| */ | ||
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| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
| #include <inttypes.h> | ||
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|
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| static uint32_t getle32(const void *p) | ||
| { | ||
| const uint8_t *cp = p; | ||
|
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| return (uint32_t)cp[0] + ((uint32_t)cp[1] << 8) + | ||
| ((uint32_t)cp[2] << 16) + ((uint32_t)cp[3] << 24); | ||
| } | ||
|
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| int main(int argc, char *argv[]) | ||
| { | ||
| uint32_t olen; | ||
| long ilen; | ||
| unsigned long offs; | ||
| FILE *f; | ||
|
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| if (argc < 2) { | ||
| fprintf(stderr, "Usage: %s compressed_file\n", argv[0]); | ||
| return 1; | ||
| } | ||
|
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| /* Get the information for the compressed kernel image first */ | ||
|
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| f = fopen(argv[1], "r"); | ||
| if (!f) { | ||
| perror(argv[1]); | ||
| return 1; | ||
| } | ||
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| if (fseek(f, -4L, SEEK_END)) { | ||
| perror(argv[1]); | ||
| } | ||
| fread(&olen, sizeof olen, 1, f); | ||
| ilen = ftell(f); | ||
| olen = getle32(&olen); | ||
| fclose(f); | ||
|
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| /* | ||
| * Now we have the input (compressed) and output (uncompressed) | ||
| * sizes, compute the necessary decompression offset... | ||
| */ | ||
|
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| offs = (olen > ilen) ? olen - ilen : 0; | ||
| offs += olen >> 12; /* Add 8 bytes for each 32K block */ | ||
| offs += 32*1024 + 18; /* Add 32K + 18 bytes slack */ | ||
| offs = (offs+4095) & ~4095; /* Round to a 4K boundary */ | ||
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| printf(".section \".rodata.compressed\",\"a\",@progbits\n"); | ||
| printf(".globl z_input_len\n"); | ||
| printf("z_input_len = %lu\n", ilen); | ||
| printf(".globl z_output_len\n"); | ||
| printf("z_output_len = %lu\n", (unsigned long)olen); | ||
| printf(".globl z_extract_offset\n"); | ||
| printf("z_extract_offset = 0x%lx\n", offs); | ||
| /* z_extract_offset_negative allows simplification of head_32.S */ | ||
| printf(".globl z_extract_offset_negative\n"); | ||
| printf("z_extract_offset_negative = -0x%lx\n", offs); | ||
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| printf(".globl input_data, input_data_end\n"); | ||
| printf("input_data:\n"); | ||
| printf(".incbin \"%s\"\n", argv[1]); | ||
| printf("input_data_end:\n"); | ||
|
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| return 0; | ||
| } |
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