5761eaa3a5
Improve the debugging support of the PS3 bootwraper code: o Increase the size of the PS3 bootwrapper overlay from 256 to 512 bytes to allow for more debugging code in the overlay. o Use the dot symbol to set the size of __system_reset_overlay. The assembler will then emit an error if the overlay code is too big. o Remove some unused instructions. o Update the text describing the PS3 bootwrapper overlay. o Add a check for null pointer writes. o Change hcall return value from s64. Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
90 lines
2.2 KiB
ArmAsm
90 lines
2.2 KiB
ArmAsm
/*
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* PS3 bootwrapper entry.
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*
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* Copyright (C) 2007 Sony Computer Entertainment Inc.
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* Copyright 2007 Sony Corp.
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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; version 2 of the License.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "ppc_asm.h"
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.machine "ppc64"
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.text
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/*
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* __system_reset_overlay - The PS3 first stage entry.
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*
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* The bootwraper build script copies the 512 bytes at symbol
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* __system_reset_overlay to offset 0x100 of the rom image. This symbol
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* must occupy 512 or less bytes.
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*
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* The PS3 has a single processor with two threads.
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*/
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.globl __system_reset_overlay
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__system_reset_overlay:
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/* Switch to 32-bit mode. */
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mfmsr r9
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clrldi r9,r9,1
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mtmsrd r9
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nop
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/* Get thread number in r3 and branch. */
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mfspr r3, 0x88
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cntlzw. r3, r3
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beq 1f
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/* Secondary goes to __secondary_hold in kernel. */
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li r4, 0x60
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mtctr r4
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bctr
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1:
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/* Save the value at addr zero for a null pointer write check later. */
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li r4, 0
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lwz r3, 0(r4)
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/* Primary delays then goes to _zimage_start in wrapper. */
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or 31, 31, 31 /* db16cyc */
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or 31, 31, 31 /* db16cyc */
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lis r4, _zimage_start@ha
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addi r4, r4, _zimage_start@l
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mtctr r4
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bctr
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. = __system_reset_overlay + 512
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/*
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* __system_reset_kernel - Place holder for the kernel reset vector.
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*
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* The bootwrapper build script copies 512 bytes from offset 0x100
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* of the rom image to the symbol __system_reset_kernel. At runtime
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* the bootwrapper program copies the 512 bytes at __system_reset_kernel
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* to ram address 0x100. This symbol must occupy 512 bytes.
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*/
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.globl __system_reset_kernel
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__system_reset_kernel:
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. = __system_reset_kernel + 512
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