blob: 0e84bf3a92717cc1f2705f9af78ea6266abd5385 [file] [log] [blame] [raw]
/* asmstub.c - a version of shared_src/asm.S that works under Unix */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999 Free Software Foundation, Inc.
*
* 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 "shared.h"
/* We want to prevent any circularararity in our stubs, as well as
libc name clashes. */
#undef NULL
#undef bcopy
#undef bzero
#undef getc
#undef isspace
#undef printf
#undef putchar
#undef strncat
#undef strstr
#undef tolower
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
/* Simulated memory sizes. */
#define EXTENDED_MEMSIZE (4 * 1024 * 1024) /* 4MB */
#define CONVENTIONAL_MEMSIZE (640) /* 640kB */
unsigned long install_partition = 0x20000;
unsigned long boot_drive = 0;
char version_string[] = "0.5";
char config_file[] = "/boot/grub/menu.lst";
char *grub_scratch_mem = 0;
/* The main entry point into this mess. */
void
start_stage2 (void)
{
grub_scratch_mem = memalign (16, EXTENDED_MEMSIZE);
/* Check some invariants. */
assert (BUFFERADDR + BUFFERLEN == SCRATCHADDR);
assert (FSYS_BUF % 16 == 0);
assert (FSYS_BUF + FSYS_BUFLEN == BUFFERADDR);
#ifdef HAVE_LIBCURSES
/* Get into char-at-a-time mode. */
initscr ();
cbreak ();
noecho ();
scrollok (stdscr, TRUE);
#endif
init_bios_info ();
}
void
stop (void)
{
fprintf (stderr, "grub: aborting...\n");
exit (1);
}
/* calls for direct boot-loader chaining */
void
chain_stage1 (int segment, int offset, int part_table_addr)
{
stop ();
}
void
chain_stage2 (int segment, int offset)
{
stop ();
}
/* do some funky stuff, then boot linux */
void
linux_boot (void)
{
stop ();
}
/* For bzImage kernels. */
void
big_linux_boot (void)
{
stop ();
}
/* booting a multiboot executable */
void
multi_boot (int start, int mbi)
{
stop ();
}
/* sets it to linear or wired A20 operation */
void
gateA20 (int linear)
{
/* Nothing to do in the simulator. */
}
void *
get_code_end (void)
{
/* Just return a little area for simulation. */
return malloc (1024);
}
/* memory probe routines */
int
get_memsize (int type)
{
if (!type)
return CONVENTIONAL_MEMSIZE;
else
return EXTENDED_MEMSIZE;
}
/* get_eisamemsize() : return packed EISA memory map, lower 16 bits is
* memory between 1M and 16M in 1K parts, upper 16 bits is
* memory above 16M in 64K parts. If error, return -1.
*/
int
get_eisamemsize (void)
{
return (EXTENDED_MEMSIZE / 1024);
}
#define MMAR_DESC_TYPE_AVAILABLE 1 /* available to OS */
#define MMAR_DESC_TYPE_RESERVED 2 /* not available */
#define MMAR_DESC_TYPE_ACPI_RECLAIM 3 /* usable by OS after reading ACPI */
#define MMAR_DESC_TYPE_ACPI_NVS 4 /* required to save between NVS sessions */
/* Memory map address range descriptor. */
struct mmar_desc
{
unsigned long desc_len; /* Size of this descriptor. */
unsigned long long addr; /* Base address. */
unsigned long long length; /* Length in bytes. */
unsigned long type; /* Type of address range. */
};
/* Fetch the next entry in the memory map and return the continuation
value. DESC is a pointer to the descriptor buffer, and CONT is the
previous continuation value (0 to get the first entry in the
map). */
int
get_mem_map (struct mmar_desc *desc, int cont)
{
if (! cont)
{
/* First entry, located at 1MB. */
desc->desc_len = sizeof (*desc) - sizeof (desc->desc_len);
desc->addr = 1024 * 1024;
desc->length = EXTENDED_MEMSIZE;
desc->type = MMAR_DESC_TYPE_AVAILABLE;
}
else
{
/* No more entries, so give an error. */
desc->desc_len = 0;
}
return 0;
}
/* low-level timing info */
int
getrtsecs (void)
{
return 0xff;
}
/* low-level character I/O */
void
cls (void)
{
}
/* returns packed values, LSB+1 is x, LSB is y */
int
getxy (void)
{
}
void
gotoxy (int x, int y)
{
}
/* displays an ASCII character. IBM displays will translate some
characters to special graphical ones */
void
grub_putchar (int c)
{
addch (c);
}
/* returns packed BIOS/ASCII code */
int
getkey (void)
{
int c;
nodelay (stdscr, FALSE);
c = getch ();
nodelay (stdscr, TRUE);
return c;
}
/* like 'getkey', but doesn't wait, returns -1 if nothing available */
int
checkkey (void)
{
getch ();
}
/* sets text mode character attribute at the cursor position */
void
set_attrib (int attr)
{
}
/* low-level disk I/O */
int
get_diskinfo (int drive)
{
}
int
biosdisk (int subfunc, int drive, int geometry,
int sector, int nsec, int segment)
{
}
void
stop_floppy (void)
{
}