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c121c506 VG |
1 | /* |
2 | * ARC CPU startup Code | |
3 | * | |
4 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Vineetg: Dec 2007 | |
11 | * -Check if we are running on Simulator or on real hardware | |
12 | * to skip certain things during boot on simulator | |
13 | */ | |
14 | ||
15 | #include <asm/asm-offsets.h> | |
16 | #include <asm/entry.h> | |
17 | #include <linux/linkage.h> | |
18 | #include <asm/arcregs.h> | |
19 | ||
20 | .cpu A7 | |
21 | ||
22 | .section .init.text, "ax",@progbits | |
23 | .type stext, @function | |
24 | .globl stext | |
25 | stext: | |
26 | ;------------------------------------------------------------------- | |
27 | ; Don't clobber r0-r4 yet. It might have bootloader provided info | |
28 | ;------------------------------------------------------------------- | |
29 | ||
8a229aea VG |
30 | sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE] |
31 | ||
41195d23 VG |
32 | #ifdef CONFIG_SMP |
33 | ; Only Boot (Master) proceeds. Others wait in platform dependent way | |
34 | ; IDENTITY Reg [ 3 2 1 0 ] | |
35 | ; (cpu-id) ^^^ => Zero for UP ARC700 | |
36 | ; => #Core-ID if SMP (Master 0) | |
98f74554 NC |
37 | ; Note that non-boot CPUs might not land here if halt-on-reset and |
38 | ; instead breath life from @first_lines_of_secondary, but we still | |
39 | ; need to make sure only boot cpu takes this path. | |
41195d23 VG |
40 | GET_CPU_ID r5 |
41 | cmp r5, 0 | |
42 | jnz arc_platform_smp_wait_to_boot | |
43 | #endif | |
c121c506 VG |
44 | ; Clear BSS before updating any globals |
45 | ; XXX: use ZOL here | |
46 | mov r5, __bss_start | |
47 | mov r6, __bss_stop | |
48 | 1: | |
49 | st.ab 0, [r5,4] | |
50 | brlt r5, r6, 1b | |
51 | ||
52 | #ifdef CONFIG_CMDLINE_UBOOT | |
53 | ; support for bootloader provided cmdline | |
54 | ; If cmdline passed by u-boot, then | |
55 | ; r0 = 1 (because ATAGS parsing, now retired, used to use 0) | |
56 | ; r1 = magic number (board identity) | |
57 | ; r2 = addr of cmdline string (somewhere in memory/flash) | |
58 | ||
59 | brne r0, 1, .Lother_bootup_chores ; u-boot didn't pass cmdline | |
60 | breq r2, 0, .Lother_bootup_chores ; or cmdline is NULL | |
61 | ||
62 | mov r5, @command_line | |
63 | 1: | |
64 | ldb.ab r6, [r2, 1] | |
65 | breq r6, 0, .Lother_bootup_chores | |
66 | b.d 1b | |
67 | stb.ab r6, [r5, 1] | |
68 | #endif | |
69 | ||
70 | .Lother_bootup_chores: | |
71 | ||
72 | ; Identify if running on ISS vs Silicon | |
73 | ; IDENTITY Reg [ 3 2 1 0 ] | |
74 | ; (chip-id) ^^^^^ ==> 0xffff for ISS | |
75 | lr r0, [identity] | |
76 | lsr r3, r0, 16 | |
77 | cmp r3, 0xffff | |
78 | mov.z r4, 0 | |
79 | mov.nz r4, 1 | |
80 | st r4, [@running_on_hw] | |
81 | ||
82 | ; setup "current" tsk and optionally cache it in dedicated r25 | |
83 | mov r9, @init_task | |
84 | SET_CURR_TASK_ON_CPU r9, r0 ; r9 = tsk, r0 = scratch | |
85 | ||
86 | ; setup stack (fp, sp) | |
87 | mov fp, 0 | |
88 | ||
89 | ; tsk->thread_info is really a PAGE, whose bottom hoists stack | |
90 | GET_TSK_STACK_BASE r9, sp ; r9 = tsk, sp = stack base(output) | |
91 | ||
92 | j start_kernel ; "C" entry point | |
41195d23 VG |
93 | |
94 | #ifdef CONFIG_SMP | |
95 | ;---------------------------------------------------------------- | |
96 | ; First lines of code run by secondary before jumping to 'C' | |
97 | ;---------------------------------------------------------------- | |
98 | .section .init.text, "ax",@progbits | |
99 | .type first_lines_of_secondary, @function | |
100 | .globl first_lines_of_secondary | |
101 | ||
102 | first_lines_of_secondary: | |
103 | ||
98f74554 NC |
104 | sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE] |
105 | ||
41195d23 VG |
106 | ; setup per-cpu idle task as "current" on this CPU |
107 | ld r0, [@secondary_idle_tsk] | |
108 | SET_CURR_TASK_ON_CPU r0, r1 | |
109 | ||
110 | ; setup stack (fp, sp) | |
111 | mov fp, 0 | |
112 | ||
113 | ; set it's stack base to tsk->thread_info bottom | |
114 | GET_TSK_STACK_BASE r0, sp | |
115 | ||
116 | j start_kernel_secondary | |
117 | ||
118 | #endif |