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module: Fix locking in symbol_put_addr()
[karo-tx-linux.git] / arch / arm / mach-shmobile / headsmp.S
1 /*
2  * SMP support for R-Mobile / SH-Mobile
3  *
4  * Copyright (C) 2010  Magnus Damm
5  * Copyright (C) 2010  Takashi Yoshii
6  *
7  * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/init.h>
14 #include <linux/linkage.h>
15 #include <linux/threads.h>
16 #include <asm/assembler.h>
17 #include <asm/memory.h>
18
19 /*
20  * Reset vector for secondary CPUs.
21  * This will be mapped at address 0 by SBAR register.
22  * We need _long_ jump to the physical address.
23  */
24         .arm
25         .align  12
26 ENTRY(shmobile_boot_vector)
27         ldr     r0, 2f
28         ldr     r1, 1f
29         bx      r1
30
31 ENDPROC(shmobile_boot_vector)
32
33         .align  2
34         .globl  shmobile_boot_fn
35 shmobile_boot_fn:
36 1:      .space  4
37         .globl  shmobile_boot_arg
38 shmobile_boot_arg:
39 2:      .space  4
40         .globl  shmobile_boot_size
41 shmobile_boot_size:
42         .long   . - shmobile_boot_vector
43
44 /*
45  * Per-CPU SMP boot function/argument selection code based on MPIDR
46  */
47
48 ENTRY(shmobile_smp_boot)
49                                                 @ r0 = MPIDR_HWID_BITMASK
50         mrc     p15, 0, r1, c0, c0, 5           @ r1 = MPIDR
51         and     r0, r1, r0                      @ r0 = cpu_logical_map() value
52         mov     r1, #0                          @ r1 = CPU index
53         adr     r5, 1f                          @ array of per-cpu mpidr values
54         adr     r6, 2f                          @ array of per-cpu functions
55         adr     r7, 3f                          @ array of per-cpu arguments
56
57 shmobile_smp_boot_find_mpidr:
58         ldr     r8, [r5, r1, lsl #2]
59         cmp     r8, r0
60         bne     shmobile_smp_boot_next
61
62         ldr     r9, [r6, r1, lsl #2]
63         cmp     r9, #0
64         bne     shmobile_smp_boot_found
65
66 shmobile_smp_boot_next:
67         add     r1, r1, #1
68         cmp     r1, #NR_CPUS
69         blo     shmobile_smp_boot_find_mpidr
70
71         b       shmobile_smp_sleep
72
73 shmobile_smp_boot_found:
74         ldr     r0, [r7, r1, lsl #2]
75         ret     r9
76 ENDPROC(shmobile_smp_boot)
77
78 ENTRY(shmobile_smp_sleep)
79         wfi
80         b       shmobile_smp_boot
81 ENDPROC(shmobile_smp_sleep)
82
83         .globl  shmobile_smp_mpidr
84 shmobile_smp_mpidr:
85 1:      .space  NR_CPUS * 4
86         .globl  shmobile_smp_fn
87 shmobile_smp_fn:
88 2:      .space  NR_CPUS * 4
89         .globl  shmobile_smp_arg
90 shmobile_smp_arg:
91 3:      .space  NR_CPUS * 4