boot.c revision 48907
1183840Sraj/* 2183840Sraj * Copyright (c) 1999 Global Technology Associates, Inc. 3183840Sraj * All rights reserved. 4183840Sraj * 5183840Sraj * Redistribution and use in source and binary forms, with or without 6183840Sraj * modification, are permitted provided that the following conditions 7183840Sraj * are met: 8183840Sraj * 1. Redistributions of source code must retain the above copyright 9183840Sraj * notice, this list of conditions and the following disclaimer. 10183840Sraj * 2. Redistributions in binary form must reproduce the above copyright 11183840Sraj * notice, this list of conditions and the following disclaimer in the 12183840Sraj * documentation and/or other materials provided with the distribution. 13183840Sraj * 14183840Sraj * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 15183840Sraj * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16183840Sraj * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17183840Sraj * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 18183840Sraj * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 19183840Sraj * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 20183840Sraj * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 21183840Sraj * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22183840Sraj * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 23183840Sraj * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 24183840Sraj * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25183840Sraj * 26183840Sraj * $Id:$ 27183840Sraj */ 28183840Sraj 29183840Sraj#include <sys/types.h> 30183840Sraj#include <sys/reboot.h> 31183840Sraj#include <sys/inflate.h> 32183840Sraj 33183840Sraj#include "kgzldr.h" 34183840Sraj 35183840Sraj#define KGZ_HEAD 0xa /* leading bytes to ignore */ 36183840Sraj#define KGZ_TAIL 0x8 /* trailing bytes to ignore */ 37183840Sraj 38183840Sraj#define E_FMT 1 /* Error: Invalid format */ 39183840Sraj#define E_MEM 2 /* Error: Out of memory */ 40209131Sraj 41183840Srajstruct kgz_hdr { 42183840Sraj char ident[4]; /* identification */ 43183840Sraj uint32_t dload; /* decoded image load address */ 44194072Smarcel uint32_t dsize; /* decoded image size */ 45183840Sraj uint32_t isize; /* image size in memory */ 46209131Sraj uint32_t entry; /* program entry point */ 47186932Sraj uint32_t nsize; /* encoded image size */ 48185089Sraj}; 49185089Srajextern struct kgz_hdr kgz; /* header */ 50185089Srajextern uint8_t kgz_ndata[]; /* encoded image */ 51185089Sraj 52185089Srajstatic const char *const msg[] = { 53183840Sraj "done", 54183840Sraj "invalid format", 55185089Sraj "out of memory" 56185089Sraj}; 57185089Sraj 58185089Srajstatic const u_char *ip; /* input pointer */ 59185089Srajstatic u_char *op; /* output pointer */ 60186932Sraj 61183840Srajstatic struct inflate infl; /* inflate() parameters */ 62185089Sraj 63185089Srajstatic int decode(void); 64183840Srajstatic int input(void *); 65209131Srajstatic int output(void *, u_char *, u_long); 66183840Sraj 67186909Sraj/* 68183840Sraj * Uncompress and boot a kernel. 69183840Sraj */ 70183840Srajint 71183840Srajboot(int howto) 72183840Sraj{ 73183840Sraj int err; 74183840Sraj 75183840Sraj kgz_con = howto & RB_SERIAL ? KGZ_SIO : KGZ_CRT; 76183840Sraj putstr("Uncompressing ... "); 77209131Sraj err = decode(); 78183840Sraj putstr(msg[err]); 79183840Sraj putstr("\n"); 80209131Sraj if (err) { 81186899Sraj putstr("System halted"); 82186899Sraj for (;;) 83186899Sraj ; 84186899Sraj } 85186899Sraj return err; 86186899Sraj} 87186899Sraj 88186899Sraj/* 89186899Sraj * Interface with inflate() to uncompress the data. 90186899Sraj */ 91209131Srajstatic int 92209131Srajdecode(void) 93186899Sraj{ 94186899Sraj static u_char slide[GZ_WSIZE]; 95186899Sraj int err; 96186899Sraj 97186899Sraj ip = kgz_ndata + KGZ_HEAD; 98186899Sraj op = (u_char *)kgz.dload; 99186899Sraj infl.gz_input = input; 100186899Sraj infl.gz_output = output; 101186899Sraj infl.gz_slide = slide; 102186899Sraj err = inflate(&infl); 103 return err ? err == 3 ? E_MEM : E_FMT : 0; 104} 105 106/* 107 * Read a byte. 108 */ 109static int 110input(void *dummy) 111{ 112 if ((size_t)(ip - kgz_ndata) + KGZ_TAIL > kgz.nsize) 113 return GZ_EOF; 114 return *ip++; 115} 116 117/* 118 * Write some bytes. 119 */ 120static int 121output(void *dummy, u_char * ptr, u_long len) 122{ 123 if (op - (u_char *)kgz.dload + len > kgz.dsize) 124 return -1; 125 while (len--) 126 *op++ = *ptr++; 127 return 0; 128} 129