/* ----------------------------------------------------------------------- * * * 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. */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <inttypes.h> #include <tools/le_byteshift.h> int main(int argc, char *argv[]) { uint32_t olen; long ilen; unsigned long offs; unsigned long run_size; FILE *f = NULL; int retval = 1; if (argc < 3) { fprintf(stderr, "Usage: %s compressed_file run_size\n", argv[0]); goto bail; } /* Get the information for the compressed kernel image first */ f = fopen(argv[1], "r"); if (!f) { perror(argv[1]); goto bail; } if (fseek(f, -4L, SEEK_END)) { perror(argv[1]); } if (fread(&olen, sizeof(olen), 1, f) != 1) { perror(argv[1]); goto bail; } ilen = ftell(f); olen = get_unaligned_le32(&olen); /* * Now we have the input (compressed) and output (uncompressed) * sizes, compute the necessary decompression offset... */ offs = (olen > ilen) ? olen - ilen : 0; offs += olen >> 12; /* Add 8 bytes for each 32K block */ offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */ offs = (offs+4095) & ~4095; /* Round to a 4K boundary */ run_size = atoi(argv[2]); 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); printf(".globl z_run_size\n"); printf("z_run_size = %lu\n", run_size); printf(".globl input_data, input_data_end\n"); printf("input_data:\n"); printf(".incbin \"%s\"\n", argv[1]); printf("input_data_end:\n"); retval = 0; bail: if (f) fclose(f); return retval; }