boot.c revision 50477
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1999 Global Technology Associates, Inc. 31590Srgrimes * All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 141590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 151590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 161590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 171590Srgrimes * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 181590Srgrimes * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 191590Srgrimes * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 201590Srgrimes * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 211590Srgrimes * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 221590Srgrimes * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 231590Srgrimes * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 241590Srgrimes * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 251590Srgrimes * 261590Srgrimes * $FreeBSD: head/sys/boot/i386/kgzldr/boot.c 50477 1999-08-28 01:08:13Z peter $ 271590Srgrimes */ 281590Srgrimes 291590Srgrimes#include <sys/types.h> 301590Srgrimes#include <sys/reboot.h> 311590Srgrimes#include <sys/inflate.h> 321590Srgrimes 331590Srgrimes#include "kgzldr.h" 341590Srgrimes 3541568Sarchie#define KGZ_HEAD 0xa /* leading bytes to ignore */ 361590Srgrimes#define KGZ_TAIL 0x8 /* trailing bytes to ignore */ 371590Srgrimes 381590Srgrimes#define E_FMT 1 /* Error: Invalid format */ 391590Srgrimes#define E_MEM 2 /* Error: Out of memory */ 401590Srgrimes 4141568Sarchiestruct kgz_hdr { 421590Srgrimes char ident[4]; /* identification */ 4399112Sobrien uint32_t dload; /* decoded image load address */ 4499112Sobrien uint32_t dsize; /* decoded image size */ 451590Srgrimes uint32_t isize; /* image size in memory */ 4665508Sdes uint32_t entry; /* program entry point */ 4765414Sdes uint32_t nsize; /* encoded image size */ 481590Srgrimes}; 4978717Sddextern struct kgz_hdr kgz; /* header */ 5023693Speterextern uint8_t kgz_ndata[]; /* encoded image */ 511590Srgrimes 5292920Simpstatic const char *const msg[] = { 531590Srgrimes "done", 541590Srgrimes "invalid format", 551590Srgrimes "out of memory" 561590Srgrimes}; 571590Srgrimes 581590Srgrimesstatic const u_char *ip; /* input pointer */ 5965508Sdesstatic u_char *op; /* output pointer */ 601590Srgrimes 611590Srgrimesstatic struct inflate infl; /* inflate() parameters */ 6224360Simp 631590Srgrimesstatic int decode(void); 641590Srgrimesstatic int input(void *); 651590Srgrimesstatic int output(void *, u_char *, u_long); 661590Srgrimes 671590Srgrimes/* 681590Srgrimes * Uncompress and boot a kernel. 691590Srgrimes */ 701590Srgrimesint 711590Srgrimesboot(int howto) 721590Srgrimes{ 731590Srgrimes int err; 7465508Sdes 7565508Sdes kgz_con = howto & RB_SERIAL ? KGZ_SIO : KGZ_CRT; 7665508Sdes putstr("Uncompressing ... "); 771590Srgrimes err = decode(); 781590Srgrimes putstr(msg[err]); 791590Srgrimes putstr("\n"); 801590Srgrimes if (err) { 811590Srgrimes putstr("System halted"); 821590Srgrimes for (;;) 831590Srgrimes ; 841590Srgrimes } 851590Srgrimes return err; 861590Srgrimes} 87 88/* 89 * Interface with inflate() to uncompress the data. 90 */ 91static int 92decode(void) 93{ 94 static u_char slide[GZ_WSIZE]; 95 int err; 96 97 ip = kgz_ndata + KGZ_HEAD; 98 op = (u_char *)kgz.dload; 99 infl.gz_input = input; 100 infl.gz_output = output; 101 infl.gz_slide = slide; 102 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