diff options
Diffstat (limited to 'arch/powerpc/boot/ps3-head.S')
| -rw-r--r-- | arch/powerpc/boot/ps3-head.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/powerpc/boot/ps3-head.S b/arch/powerpc/boot/ps3-head.S new file mode 100644 index 000000000..b6fcbaf50 --- /dev/null +++ b/arch/powerpc/boot/ps3-head.S @@ -0,0 +1,89 @@ +/* + * PS3 bootwrapper entry. + * + * Copyright (C) 2007 Sony Computer Entertainment Inc. + * Copyright 2007 Sony Corp. + * + * 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; version 2 of the License. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "ppc_asm.h" + + .machine "ppc64" + + .text + +/* + * __system_reset_overlay - The PS3 first stage entry. + * + * The bootwraper build script copies the 512 bytes at symbol + * __system_reset_overlay to offset 0x100 of the rom image. This symbol + * must occupy 512 or less bytes. + * + * The PS3 has a single processor with two threads. + */ + + .globl __system_reset_overlay +__system_reset_overlay: + + /* Switch to 32-bit mode. */ + + mfmsr r9 + clrldi r9,r9,1 + mtmsrd r9 + nop + + /* Get thread number in r3 and branch. */ + + mfspr r3, 0x88 + cntlzw. r3, r3 + beq 1f + + /* Secondary goes to __secondary_hold in kernel. */ + + li r4, 0x60 + mtctr r4 + bctr + +1: + /* Save the value at addr zero for a null pointer write check later. */ + + li r4, 0 + lwz r3, 0(r4) + + /* Primary delays then goes to _zimage_start in wrapper. */ + + or 31, 31, 31 /* db16cyc */ + or 31, 31, 31 /* db16cyc */ + + lis r4, _zimage_start@ha + addi r4, r4, _zimage_start@l + mtctr r4 + bctr + + . = __system_reset_overlay + 512 + +/* + * __system_reset_kernel - Place holder for the kernel reset vector. + * + * The bootwrapper build script copies 512 bytes from offset 0x100 + * of the rom image to the symbol __system_reset_kernel. At runtime + * the bootwrapper program copies the 512 bytes at __system_reset_kernel + * to ram address 0x100. This symbol must occupy 512 bytes. + */ + + .globl __system_reset_kernel +__system_reset_kernel: + + . = __system_reset_kernel + 512 |