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/arch/powerpc/boot/ps3-head.S

https://github.com/aicjofs/android_kernel_lge_v500_20d
Assembly | 89 lines | 69 code | 20 blank | 0 comment | 3 complexity | e5452a75c44dca9239d96530c4669458 MD5 | raw file
 1/*
 2 *  PS3 bootwrapper entry.
 3 *
 4 *  Copyright (C) 2007 Sony Computer Entertainment Inc.
 5 *  Copyright 2007 Sony Corp.
 6 *
 7 *  This program is free software; you can redistribute it and/or modify
 8 *  it under the terms of the GNU General Public License as published by
 9 *  the Free Software Foundation; version 2 of the License.
10 *
11 *  This program is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *  GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with this program; if not, write to the Free Software
18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20
21#include "ppc_asm.h"
22
23	.machine "ppc64"
24
25	.text
26
27/*
28 * __system_reset_overlay - The PS3 first stage entry.
29 *
30 * The bootwraper build script copies the 512 bytes at symbol
31 * __system_reset_overlay to offset 0x100 of the rom image.  This symbol
32 * must occupy 512 or less bytes.
33 *
34 * The PS3 has a single processor with two threads.
35 */
36
37	.globl __system_reset_overlay
38__system_reset_overlay:
39
40	/* Switch to 32-bit mode. */
41
42	mfmsr	r9
43	clrldi	r9,r9,1
44	mtmsrd	r9
45	nop
46
47	/* Get thread number in r3 and branch. */
48
49	mfspr	r3, 0x88
50	cntlzw.	r3, r3
51	beq	1f
52
53	/* Secondary goes to __secondary_hold in kernel. */
54
55	li	r4, 0x60
56	mtctr	r4
57	bctr
58
591:
60	/* Save the value at addr zero for a null pointer write check later. */
61
62	li	r4, 0
63	lwz	r3, 0(r4)
64
65	/* Primary delays then goes to _zimage_start in wrapper. */
66
67	or	31, 31, 31 /* db16cyc */
68	or	31, 31, 31 /* db16cyc */
69
70	lis	r4, _zimage_start@ha
71	addi	r4, r4, _zimage_start@l
72	mtctr	r4
73	bctr
74
75	. = __system_reset_overlay + 512
76
77/*
78 * __system_reset_kernel - Place holder for the kernel reset vector.
79 *
80 * The bootwrapper build script copies 512 bytes from offset 0x100
81 * of the rom image to the symbol __system_reset_kernel.  At runtime
82 * the bootwrapper program copies the 512 bytes at __system_reset_kernel
83 * to ram address 0x100.  This symbol must occupy 512 bytes.
84 */
85
86	.globl __system_reset_kernel
87__system_reset_kernel:
88
89	. = __system_reset_kernel + 512