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6bc9a396 CL |
1 | /* |
2 | * arch/score/kernel/head.S | |
3 | * | |
4 | * Score Processor version. | |
5 | * | |
6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
7 | * Chen Liqin <liqin.chen@sunplusct.com> | |
8 | * Lennox Wu <lennox.wu@sunplusct.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, see the file COPYING, or write | |
22 | * to the Free Software Foundation, Inc., | |
23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
24 | */ | |
25 | #include <linux/init.h> | |
26 | #include <linux/linkage.h> | |
27 | ||
28 | #include <asm/asm-offsets.h> | |
29 | ||
30 | .extern start_kernel | |
31 | .global init_thread_union | |
32 | .global kernelsp | |
33 | ||
34 | __INIT | |
35 | ENTRY(_stext) | |
36 | la r30, __bss_start /* initialize BSS segment. */ | |
37 | la r31, _end | |
38 | xor r8, r8, r8 | |
39 | ||
40 | 1: cmp.c r31, r30 | |
41 | beq 2f | |
42 | ||
43 | sw r8, [r30] /* clean memory. */ | |
44 | addi r30, 4 | |
45 | b 1b | |
46 | ||
47 | 2: la r28, init_thread_union /* set kernel stack. */ | |
48 | mv r0, r28 | |
49 | addi r0, KERNEL_STACK_SIZE - 32 | |
50 | la r30, kernelsp | |
51 | sw r0, [r30] | |
52 | subi r0, 4*4 | |
53 | xor r30, r30, r30 | |
54 | ori r30, 0x02 /* enable MMU. */ | |
55 | mtcr r30, cr4 | |
56 | nop | |
57 | nop | |
58 | nop | |
59 | nop | |
60 | nop | |
61 | nop | |
62 | nop | |
63 | ||
64 | /* there is no parameter */ | |
65 | xor r4, r4, r4 | |
66 | xor r5, r5, r5 | |
67 | xor r6, r6, r6 | |
68 | xor r7, r7, r7 | |
69 | la r30, start_kernel /* jump to init_arch */ | |
70 | br r30 |