105 lines
3 KiB
C
105 lines
3 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, 2005 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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/* 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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grub_ieee1275_phandle_t grub_ieee1275_chosen;
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static grub_uint32_t grub_ieee1275_flags;
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int
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grub_ieee1275_test_flag (enum grub_ieee1275_flag flag)
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{
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return (grub_ieee1275_flags & (1 << flag));
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}
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void
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grub_ieee1275_set_flag (enum grub_ieee1275_flag flag)
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{
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grub_ieee1275_flags |= (1 << flag);
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}
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static void
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grub_ieee1275_find_options (void)
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{
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grub_ieee1275_phandle_t options;
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grub_ieee1275_phandle_t openprom;
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int realmode;
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int smartfw;
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grub_ieee1275_finddevice ("/options", &options);
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grub_ieee1275_get_property (options, "real-mode?", &realmode,
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sizeof (realmode), 0);
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if (realmode)
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grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_REAL_MODE);
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grub_ieee1275_finddevice ("/openprom", &openprom);
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smartfw = grub_ieee1275_get_property (openprom, "SmartFirmware-version",
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0, 0, 0);
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if (smartfw != -1)
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grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_0_BASED_PARTITIONS);
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}
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void cmain (uint32_t r3, uint32_t r4, uint32_t r5);
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void
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cmain (uint32_t r3, uint32_t r4 __attribute__((unused)), uint32_t r5)
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{
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if (r5 == 0xdeadbeef)
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{
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/* Entered from Old World stage1. */
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extern char _start;
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extern char _end;
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grub_ieee1275_entry_fn = (intptr_t (*)(void *)) r3;
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grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0);
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/* Old World Open Firmware may use 4M-5M without claiming it. */
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grub_ieee1275_claim (0x00400000, 0x00100000, 0, 0);
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/* Need to claim ourselves so we don't cannibalize our memory later. */
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if (grub_ieee1275_claim ((grub_addr_t) &_start, (grub_addr_t) &_end
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- (grub_addr_t) &_start, 0, 0))
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abort();
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}
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else
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{
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/* Assume we were entered from Open Firmware. */
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grub_ieee1275_entry_fn = (intptr_t (*)(void *)) r5;
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}
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grub_ieee1275_finddevice ("/chosen", &grub_ieee1275_chosen);
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grub_ieee1275_find_options ();
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/* Now invoke the main function. */
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grub_main ();
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/* Never reached. */
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}
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