64 lines
1.6 KiB
ArmAsm
64 lines
1.6 KiB
ArmAsm
/* startup.S - Startup code for the PowerPC. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/symbol.h>
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#include <grub/offsets.h>
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.extern __bss_start
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.extern _end
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.text
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.align 2
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.globl start, _start
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start:
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_start:
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b codestart
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. = _start + GRUB_KERNEL_MACHINE_PREFIX
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VARIABLE(grub_prefix)
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/* to be filled by grub-mkelfimage */
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/*
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* Leave some breathing room for the prefix.
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*/
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. = _start + GRUB_KERNEL_MACHINE_DATA_END
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codestart:
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li 2, 0
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li 13, 0
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/* Stage1 won't zero BSS for us. In other cases, why not do it again? */
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lis 6, (__bss_start - 4)@h
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ori 6, 6, (__bss_start - 4)@l
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lis 7, (_end - 4)@h
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ori 7, 7, (_end - 4)@l
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subf 7, 6, 7
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srwi 7, 7, 2 /* We store 4 bytes at a time. */
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mtctr 7
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2: stwu 2, 4(6) /* We know r2 is already 0 from above. */
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bdnz 2b
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/* Store r5 in grub_ieee1275_entry_fn. */
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lis 9, grub_ieee1275_entry_fn@ha
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stw 5, grub_ieee1275_entry_fn@l(9)
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bl grub_main
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1: b 1b
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