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/*
* net.c
*
* This file is part of aboot, the SRM bootloader for Linux/Alpha
* Copyright (C) 1996 Dave Larson, and David Mosberger.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <asm/console.h>
#include <asm/system.h>
#include <linux/string.h>
#include "config.h"
#include "cons.h"
#include "aboot.h"
#include "bootfs.h"
#include "utils.h"
#include "netwrap.h"
extern char boot_file[256];
void
dang (void)
{
printf("aboot: oops, unimplemented net-bfs function called!\n");
}
extern char _end;
static char *src = 0;
static char *kern_src=0, *ird_src=0;
static int header_size=0, kern_size=0, ird_size=0;
int
net_bread (int fd, long blkno, long nblks, char * buf)
{
int nbytes;
#ifdef DEBUG
printf("net_bread: %p -> %p (%ld blocks at %ld)\n", src, buf,
nblks, blkno);
#endif
nbytes = bfs->blocksize * nblks;
memcpy(buf, src, nbytes);
src += nbytes;
return nbytes;
}
struct bootfs netfs = {
-1, 512,
(int (*)(long, long, long)) dang, /* mount */
(int (*)(const char *)) dang, /* open */
net_bread, /* bread */
(void (*)(int fd)) dang, /* close */
(const char* (*)(int, int)) dang, /* readdir */
(int (*)(int, struct stat*)) dang, /* fstat */
};
long
read_initrd()
{
int nblocks, nread;
/* put it as high up in memory as possible */
initrd_start = free_mem_ptr - align_pagesize(ird_size);
initrd_size = ird_size;
/* update free_mem_ptr so malloc() still works */
free_mem_ptr = initrd_start;
#ifdef DEBUG
printf("memory_end %x %x\n", free_mem_ptr, initrd_start);
#endif
nblocks = align_512(ird_size)/ 512;
printf("aboot: loading initrd (%d bytes/%d blocks) at %#lx\n",
ird_size, nblocks, initrd_start);
nread = (*bfs->bread)(-1, 0, nblocks, (char*) initrd_start);
return 0;
}
long
load_kernel (void)
{
struct header *header;
bfs = &netfs;
header = (struct header *)align_512( (unsigned long)&_end );
header_size = header->header_size;
kern_src = (char *)align_512((unsigned long)header + header_size);
kern_size = header->kern_size;
ird_src = (char *)align_512((unsigned long)kern_src + kern_size);
ird_size = header->ird_size;
if (!free_mem_ptr)
free_mem_ptr = memory_end();
free_mem_ptr = free_mem_ptr & ~(PAGE_SIZE-1);
#ifdef DEBUG
printf("head %x %x kernel %x %x, initrd %x %x \n", header, header_size, kern_src, kern_size, ird_src, ird_size);
#endif
if (ird_size) {
src = ird_src;
if (read_initrd() < 0) {
return -1;
}
}
strcpy(boot_file, "network");
//Move kernel to safe place before uncompression
src = (char*)free_mem_ptr - align_pagesize(kern_size);
(char*)free_mem_ptr = src;
memcpy(src, kern_src, kern_size);
uncompress_kernel(-1);
memset((char*)bss_start, 0, bss_size); /* clear bss */
if (!kernel_args[0] && header->boot_arg[0]) { //have argument?
strncpy(kernel_args, header->boot_arg, header_size - sizeof(int)*3);
}
while (kernel_args[0] == 'i' && !kernel_args[1]) {
printf("Enter kernel arguments:\n");
printf("aboot> ");
getline(kernel_args, sizeof(kernel_args));
printf("\n");
}
return 0;
}
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