4b13b216f4
All symbols prefixed with PUPA_ and pupa_ are renamed to GRUB_ and grub_, respectively. Because the conversion is trivial and mechanical, I omit the details here. Please refer to the CVS if you need more information.
148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/* cmain.c - Startup code for the PowerPC. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <alloca.h>
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#include <stdint.h>
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#include "grub/machine/ieee1275.h"
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#include "grub/kernel.h"
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struct module_info
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{
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uint32_t start;
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uint32_t end;
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};
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#define roundup(a, s) (((a) + ((s) - 1)) & ~((s) - 1))
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/* OpenFirmware entry point passed to us from the real bootloader. */
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intptr_t (*grub_ieee1275_entry_fn) (void *);
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/* Return a help text for this architecture. */
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const char *
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help_arch (void)
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{
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/* No special information. */
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return "";
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}
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/* Setup the argument vector and pass control over to the main
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function. */
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void
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cmain (uint32_t firmware_entry)
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{
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char **argv, args[256];
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grub_ieee1275_phandle_t chosen;
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int argc = 0, actual;
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long batl, batu;
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grub_ieee1275_entry_fn = (intptr_t (*)(void *)) firmware_entry;
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/* Initialize BAT registers to unmapped to not generate overlapping
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mappings below. */
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asm volatile ("mtibatu 0,%0" :: "r"(0));
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asm volatile ("mtibatu 1,%0" :: "r"(0));
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asm volatile ("mtibatu 2,%0" :: "r"(0));
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asm volatile ("mtibatu 3,%0" :: "r"(0));
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asm volatile ("mtdbatu 0,%0" :: "r"(0));
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asm volatile ("mtdbatu 1,%0" :: "r"(0));
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asm volatile ("mtdbatu 2,%0" :: "r"(0));
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asm volatile ("mtdbatu 3,%0" :: "r"(0));
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/* Set up initial BAT table to only map the lowest 256 MB area. */
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batl = 0x00000000 | 0x10 | 0x02;
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batu = 0x00000000 | 0x1ffc | 0x02;
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/* IBAT0 used for initial 256 MB segment */
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asm volatile ("mtibatl 3,%0; mtibatu 3,%1" :: "r" (batl), "r" (batu));
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/* DBAT0 used similar */
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asm volatile ("mtdbatl 3,%0; mtdbatu 3,%1" :: "r" (batl), "r" (batu));
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asm ("isync");
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/* If any argument was passed to the kernel (us), they are
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put in the bootargs property of /chosen. The string can
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be null (just the nul-character), so check that the size
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is actually greater than one. */
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grub_ieee1275_finddevice ("/chosen", &chosen);
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if (grub_ieee1275_get_property (chosen, "bootargs", args,
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sizeof args, &actual) == 0
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&& actual > 1)
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{
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/* A command line was passed. */
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char *str = args;
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int nr = 1;
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/* First time around we count the number of arguments. */
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argc = 2;
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while (*str && *str == ' ')
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str++;
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while (*str)
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if (*(str++) == ' ')
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{
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while (*str && *str == ' ')
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str++;
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if (*str)
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argc++;
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}
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argv = alloca (sizeof (char *) * (argc + 2));
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/* The bootargs property does not contain the program
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name, just the arguments. */
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argv[0] = "grub";
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/* Second time around we fill in the argv. */
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str = args;
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while (*str && *str == ' ')
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str++;
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argv[nr++] = str;
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while (*str)
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{
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if (*str == ' ')
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{
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*(str++) = '\0';
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while (*str && *str == ' ')
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str++;
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if (*str)
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argv[nr++] = str;
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}
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else
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str++;
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}
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argv[nr] = 0;
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}
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else
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{
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argv = alloca (sizeof (char *) * 2);
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argv[0] = "grub";
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argv[1] = 0;
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argc = 1;
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}
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/* Now invoke the main function. */
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/* XXX: grub_main does not parse arguments yet. */
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grub_main ();
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/* Never reached. */
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}
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