129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* Copyright (c) 1999 Global Technology Associates, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id:$
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*/
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#include <sys/types.h>
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#include <sys/reboot.h>
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#include <sys/inflate.h>
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#include "kgzldr.h"
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#define KGZ_HEAD 0xa /* leading bytes to ignore */
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#define KGZ_TAIL 0x8 /* trailing bytes to ignore */
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#define E_FMT 1 /* Error: Invalid format */
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#define E_MEM 2 /* Error: Out of memory */
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struct kgz_hdr {
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char ident[4]; /* identification */
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uint32_t dload; /* decoded image load address */
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uint32_t dsize; /* decoded image size */
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uint32_t isize; /* image size in memory */
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uint32_t entry; /* program entry point */
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uint32_t nsize; /* encoded image size */
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};
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extern struct kgz_hdr kgz; /* header */
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extern uint8_t kgz_ndata[]; /* encoded image */
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static const char *const msg[] = {
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"done",
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"invalid format",
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"out of memory"
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};
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static const u_char *ip; /* input pointer */
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static u_char *op; /* output pointer */
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static struct inflate infl; /* inflate() parameters */
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static int decode(void);
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static int input(void *);
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static int output(void *, u_char *, u_long);
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/*
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* Uncompress and boot a kernel.
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*/
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int
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boot(int howto)
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{
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int err;
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kgz_con = howto & RB_SERIAL ? KGZ_SIO : KGZ_CRT;
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putstr("Uncompressing ... ");
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err = decode();
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putstr(msg[err]);
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putstr("\n");
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if (err) {
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putstr("System halted");
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for (;;)
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;
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}
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return err;
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}
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/*
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* Interface with inflate() to uncompress the data.
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*/
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static int
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decode(void)
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{
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static u_char slide[GZ_WSIZE];
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int err;
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ip = kgz_ndata + KGZ_HEAD;
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op = (u_char *)kgz.dload;
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infl.gz_input = input;
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infl.gz_output = output;
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infl.gz_slide = slide;
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err = inflate(&infl);
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return err ? err == 3 ? E_MEM : E_FMT : 0;
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}
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/*
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* Read a byte.
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*/
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static int
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input(void *dummy)
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{
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if ((size_t)(ip - kgz_ndata) + KGZ_TAIL > kgz.nsize)
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return GZ_EOF;
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return *ip++;
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}
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/*
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* Write some bytes.
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*/
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static int
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output(void *dummy, u_char * ptr, u_long len)
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{
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if (op - (u_char *)kgz.dload + len > kgz.dsize)
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return -1;
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while (len--)
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*op++ = *ptr++;
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return 0;
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}
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