185 lines
4.5 KiB
C
185 lines
4.5 KiB
C
/* main.c
|
|
|
|
Taken from OpenBIOS 0.0.1/boot/boot32/main.c which was in turn taken
|
|
from /usr/src/linux/arch/i386/boot/compressed/misc.c
|
|
|
|
Used for start32, 1/11/2000
|
|
James Hendricks, Dale Webster */
|
|
|
|
|
|
/* misc.c
|
|
*
|
|
* This is a collection of several routines from gzip-1.0.3
|
|
* adapted for Linux.
|
|
*
|
|
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
|
|
* puts by Nick Holloway 1993, better puts by Martin Mares 1995
|
|
* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
|
|
*/
|
|
|
|
#include <printk.h>
|
|
#include <params.h>
|
|
#include <subr.h>
|
|
#include <rom/fill_inbuf.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#if USE_ELF_BOOT
|
|
#include <boot/elf.h>
|
|
#endif
|
|
#include "do_inflate.h"
|
|
|
|
#ifdef USE_TFTP
|
|
extern void netboot_init(void);
|
|
extern int tftp_init(const char *name);
|
|
extern int tftp_fetchone(char *buffer);
|
|
#endif
|
|
|
|
int linuxbiosmain(unsigned long base, unsigned long totalram)
|
|
{
|
|
unsigned char *empty_zero_page;
|
|
|
|
unsigned char *cmd_line;
|
|
unsigned long initrd_start, initrd_size;
|
|
|
|
#ifdef USE_TFTP
|
|
char buffer[256];
|
|
char *bufptr;
|
|
int buflen;
|
|
#endif
|
|
|
|
#if USE_ELF_BOOT
|
|
return elfboot(totalram);
|
|
#else
|
|
|
|
|
|
printk("\n");
|
|
printk("Welcome to start32, the open sourced starter.\n");
|
|
printk("This space will eventually hold more diagnostic information.\n");
|
|
printk("\n");
|
|
printk("January 2000, James Hendricks, Dale Webster, and Ron Minnich.\n");
|
|
printk("Version 0.1\n");
|
|
printk("\n");
|
|
|
|
initrd_start = 0;
|
|
initrd_size = 0;
|
|
#ifdef CMD_LINE
|
|
cmd_line = CMD_LINE;
|
|
#else
|
|
cmd_line = "root=/dev/hda1 single";
|
|
#endif
|
|
|
|
#ifdef LOADER_SETUP
|
|
loader_setup(base,
|
|
totalram,
|
|
&initrd_start,
|
|
&initrd_size,
|
|
&cmd_line,
|
|
&zkernel_start,
|
|
&zkernel_mask);
|
|
#endif
|
|
|
|
|
|
post_code(0xf1);
|
|
|
|
#ifdef PYRO_TEST1
|
|
printk(KERN_NOTICE "LiLa loader, press a key to test netboot_init:");
|
|
buflen = sizeof(buffer);
|
|
ttys0_rx_line(buffer, &buflen);
|
|
#endif
|
|
|
|
#ifdef USE_TFTP
|
|
netboot_init();
|
|
printk(KERN_NOTICE "\nnetboot_init test complete, all is well (I hope!)\n");
|
|
#endif
|
|
|
|
DBG("Gunzip setup\n");
|
|
gunzip_setup();
|
|
DBG("Gunzipping boot code\n");
|
|
if (gunzip() != 0) {
|
|
printk("gunzip failed\n");
|
|
post_code(0xff);
|
|
return 0;
|
|
}
|
|
post_code(0xf8);
|
|
|
|
#ifdef TFTP_INITRD
|
|
printk("Loading initrd now\n");
|
|
|
|
buflen = tftp_init("initrd");
|
|
printk("TFTP init complete (%d)\n",buflen);
|
|
buflen = 512; // I know, not it's purpose,
|
|
// but it isn't being used at this point.
|
|
bufptr = (char *) initrd_start = 0x0400000;
|
|
while(buflen == 512) {
|
|
buflen = tftp_fetchone(bufptr);
|
|
#ifdef DEBUG_TFTP
|
|
printk("Got block, bufptr = %lu, size= %u\n",bufptr, buflen);
|
|
#endif
|
|
bufptr += buflen;
|
|
}
|
|
initrd_size = (unsigned long) bufptr - initrd_start;
|
|
|
|
printk("Initrd loaded\n");
|
|
|
|
if(tftp_init("cmdline") >=0) {
|
|
buflen = tftp_fetchone(buffer);
|
|
buffer[buflen] = '\0';
|
|
cmd_line=buffer;
|
|
}
|
|
|
|
printk("Booting with command line: %s\n",cmd_line);
|
|
|
|
|
|
#endif
|
|
|
|
/* parameter passing to linux. You have to get the pointer to the
|
|
* empty_zero_page, then fill it in.
|
|
*/
|
|
/* should we do this in intel_main(). If we did we would have to save it
|
|
* maybe -- 0x90000 might get stomped. We do it here as the last step.
|
|
*/
|
|
/* yes I know we need prototypes -- we'll do it soon */
|
|
empty_zero_page = get_empty_zero_page();
|
|
init_params(empty_zero_page);
|
|
post_code(0xf9);
|
|
|
|
/* the ram address should be the last mbyte, AFAIK. Subtract one for the
|
|
* low 1 MB. So subtract 2K total
|
|
*/
|
|
set_memory_size(empty_zero_page, 0x3c00, totalram - 2048);
|
|
post_code(0xfa);
|
|
|
|
PRINTK(KERN_NOTICE "command line - [%s]\n", cmd_line);
|
|
|
|
set_command_line(empty_zero_page, cmd_line);
|
|
set_root_rdonly(empty_zero_page);
|
|
set_display(empty_zero_page, 25, 80);
|
|
set_initrd(empty_zero_page, initrd_start, initrd_size);
|
|
|
|
|
|
DBG("Jumping to boot code\n");
|
|
post_code(0xfe);
|
|
|
|
/* there seems to be a bug in gas? it's generating wrong bit-patterns ...
|
|
typedef void (*kernel) ();
|
|
kernel v;
|
|
v = (kernel)KERNEL_START;
|
|
v();
|
|
*/
|
|
/* move 0x90000 to into esi (This is the address of the linux parameter page)
|
|
* Linux then copies this page into it's ``empty_zero_page'' so it isn't
|
|
* stomped while things are being setup.
|
|
* Later the ``empty_zero_page'' is zeroed and used fulfill read demands
|
|
* on memory mappings of file holes and the like.
|
|
* As of 2.4.0-test4 the linux parameter page isn't hardwired to be
|
|
* at 0x90000 anymore.
|
|
*/
|
|
/* move 0 to ebx. This is for SMP support. Jump to kernel */
|
|
__asm__ __volatile__("movl $0x90000, %%esi\n\t"
|
|
"movl $0, %%ebx\n\t"
|
|
"ljmp $0x10, %0\n\t"
|
|
:: "i" (0x100000));
|
|
|
|
return 0; /* It should not ever return */
|
|
#endif
|
|
}
|