grub/boot/powerpc/ieee1275/cmain.c
hollisb ac507d1ba2 2005-01-03 Hollis Blanchard <hollis@penguinppc.org>
* boot/powerpc/ieee1275/cmain.c (grub_ieee1275_realmode): New
	variable.
	(find_options): New function.
	(cmain): Call find_options.
	* include/grub/powerpc/ieee1275/ieee1275.h
	(grub_ieee1275_realmode): New extern variable.
	* kern/powerpc/ieee1275/openfw.c (grub_claimmap): Only call
	grub_map if grub_ieee1275_realmode is false.
2005-01-03 17:44:25 +00:00

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/* cmain.c - Startup code for the PowerPC. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003, 2004, 2005 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 <alloca.h>
#include <stdint.h>
#include <grub/machine/ieee1275.h>
#include <grub/kernel.h>
#include <grub/machine/init.h>
struct module_info
{
uint32_t start;
uint32_t end;
};
#define roundup(a, s) (((a) + ((s) - 1)) & ~((s) - 1))
/* OpenFirmware entry point passed to us from the real bootloader. */
intptr_t (*grub_ieee1275_entry_fn) (void *);
grub_uint32_t grub_ieee1275_flags;
int grub_ieee1275_realmode;
static void
find_options (void)
{
grub_ieee1275_phandle_t options;
grub_ieee1275_finddevice ("/options", &options);
grub_ieee1275_get_property (options, "real-mode?", &grub_ieee1275_realmode,
sizeof (grub_ieee1275_realmode), 0);
}
/* Setup the argument vector and pass control over to the main
function. */
void
cmain (uint32_t r3, uint32_t r4 __attribute__((unused)), uint32_t r5)
{
char **argv, args[256];
grub_ieee1275_phandle_t chosen;
int argc = 0, actual;
if (r5 == 0xdeadbeef)
{
/* Entered from Old World stage1. */
extern char _start;
extern char _end;
grub_ieee1275_entry_fn = (intptr_t (*)(void *)) r3;
grub_ieee1275_flags = GRUB_IEEE1275_NO_PARTITION_0;
/* Old World Open Firmware may use 4M-5M without claiming it. */
grub_ieee1275_claim (0x00400000, 0x00100000, 0, 0);
/* Need to claim ourselves so we don't cannibalize our memory later. */
if (grub_ieee1275_claim ((grub_addr_t) &_start, (grub_addr_t) &_end
- (grub_addr_t) &_start, 0, 0))
abort();
}
else
{
/* Assume we were entered from Open Firmware. */
grub_ieee1275_entry_fn = (intptr_t (*)(void *)) r5;
}
find_options ();
/* If any argument was passed to the kernel (us), they are
put in the bootargs property of /chosen. The string can
be null (just the nul-character), so check that the size
is actually greater than one. */
grub_ieee1275_finddevice ("/chosen", &chosen);
if (grub_ieee1275_get_property (chosen, "bootargs", args,
sizeof args, &actual) == 0
&& actual > 1)
{
/* A command line was passed. */
char *str = args;
int nr = 1;
/* First time around we count the number of arguments. */
argc = 2;
while (*str && *str == ' ')
str++;
while (*str)
if (*(str++) == ' ')
{
while (*str && *str == ' ')
str++;
if (*str)
argc++;
}
argv = alloca (sizeof (char *) * (argc + 2));
/* The bootargs property does not contain the program
name, just the arguments. */
argv[0] = "grub";
/* Second time around we fill in the argv. */
str = args;
while (*str && *str == ' ')
str++;
argv[nr++] = str;
while (*str)
{
if (*str == ' ')
{
*(str++) = '\0';
while (*str && *str == ' ')
str++;
if (*str)
argv[nr++] = str;
}
else
str++;
}
argv[nr] = 0;
}
else
{
argv = alloca (sizeof (char *) * 2);
argv[0] = "grub";
argv[1] = 0;
argc = 1;
}
/* Now invoke the main function. */
/* XXX: grub_main does not parse arguments yet. */
grub_main ();
/* Never reached. */
}