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f6b0fa02 | 1 | #include <linux/linkage.h> |
941aefac | 2 | #include <linux/threads.h> |
f6b0fa02 RK |
3 | #include <asm/asm-offsets.h> |
4 | #include <asm/assembler.h> | |
5 | #include <asm/glue-cache.h> | |
6 | #include <asm/glue-proc.h> | |
f6b0fa02 RK |
7 | .text |
8 | ||
9 | /* | |
abda1bd5 RK |
10 | * Save CPU state for a suspend. This saves the CPU general purpose |
11 | * registers, and allocates space on the kernel stack to save the CPU | |
12 | * specific registers and some other data for resume. | |
13 | * r0 = suspend function arg0 | |
14 | * r1 = suspend function | |
f6b0fa02 | 15 | */ |
2c74a0ce | 16 | ENTRY(__cpu_suspend) |
e8856a87 | 17 | stmfd sp!, {r4 - r11, lr} |
f6b0fa02 RK |
18 | #ifdef MULTI_CPU |
19 | ldr r10, =processor | |
abda1bd5 | 20 | ldr r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state |
941aefac | 21 | #else |
abda1bd5 | 22 | ldr r4, =cpu_suspend_size |
3fd431bd | 23 | #endif |
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24 | mov r5, sp @ current virtual SP |
25 | add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn | |
26 | sub sp, sp, r4 @ allocate CPU state on stack | |
27 | stmfd sp!, {r0, r1} @ save suspend func arg and pointer | |
28 | add r0, sp, #8 @ save pointer to save block | |
29 | mov r1, r4 @ size of save block | |
30 | mov r2, r5 @ virtual SP | |
31 | ldr r3, =sleep_save_sp | |
941aefac RK |
32 | #ifdef CONFIG_SMP |
33 | ALT_SMP(mrc p15, 0, lr, c0, c0, 5) | |
34 | ALT_UP(mov lr, #0) | |
35 | and lr, lr, #15 | |
abda1bd5 | 36 | add r3, r3, lr, lsl #2 |
f6b0fa02 | 37 | #endif |
abda1bd5 | 38 | bl __cpu_suspend_save |
29cb3cd2 | 39 | adr lr, BSYM(cpu_suspend_abort) |
3799bbe5 | 40 | ldmfd sp!, {r0, pc} @ call suspend fn |
2c74a0ce | 41 | ENDPROC(__cpu_suspend) |
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42 | .ltorg |
43 | ||
29cb3cd2 | 44 | cpu_suspend_abort: |
de8e71ca | 45 | ldmia sp!, {r1 - r3} @ pop phys pgd, virt SP, phys resume fn |
f5fa68d9 RK |
46 | teq r0, #0 |
47 | moveq r0, #1 @ force non-zero value | |
29cb3cd2 RK |
48 | mov sp, r2 |
49 | ldmfd sp!, {r4 - r11, pc} | |
50 | ENDPROC(cpu_suspend_abort) | |
51 | ||
f6b0fa02 RK |
52 | /* |
53 | * r0 = control register value | |
f6b0fa02 | 54 | */ |
62b2d07c | 55 | .align 5 |
e6eadc67 | 56 | .pushsection .idmap.text,"ax" |
f6b0fa02 | 57 | ENTRY(cpu_resume_mmu) |
f6b0fa02 | 58 | ldr r3, =cpu_resume_after_mmu |
d675d0bc | 59 | instr_sync |
e8ce0eb5 RK |
60 | mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc |
61 | mrc p15, 0, r0, c0, c0, 0 @ read id reg | |
d675d0bc | 62 | instr_sync |
e8ce0eb5 RK |
63 | mov r0, r0 |
64 | mov r0, r0 | |
f6b0fa02 | 65 | mov pc, r3 @ jump to virtual address |
62b2d07c | 66 | ENDPROC(cpu_resume_mmu) |
e6eadc67 | 67 | .popsection |
f6b0fa02 | 68 | cpu_resume_after_mmu: |
14cd8fd5 | 69 | bl cpu_init @ restore the und/abt/irq banked regs |
29cb3cd2 | 70 | mov r0, #0 @ return zero on success |
5fa94c81 | 71 | ldmfd sp!, {r4 - r11, pc} |
f6b0fa02 RK |
72 | ENDPROC(cpu_resume_after_mmu) |
73 | ||
74 | /* | |
75 | * Note: Yes, part of the following code is located into the .data section. | |
76 | * This is to allow sleep_save_sp to be accessed with a relative load | |
77 | * while we can't rely on any MMU translation. We could have put | |
78 | * sleep_save_sp in the .text section as well, but some setups might | |
79 | * insist on it to be truly read-only. | |
80 | */ | |
81 | .data | |
82 | .align | |
83 | ENTRY(cpu_resume) | |
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84 | #ifdef CONFIG_SMP |
85 | adr r0, sleep_save_sp | |
86 | ALT_SMP(mrc p15, 0, r1, c0, c0, 5) | |
87 | ALT_UP(mov r1, #0) | |
88 | and r1, r1, #15 | |
89 | ldr r0, [r0, r1, lsl #2] @ stack phys addr | |
90 | #else | |
f6b0fa02 | 91 | ldr r0, sleep_save_sp @ stack phys addr |
941aefac | 92 | #endif |
fb4fe87d | 93 | setmode PSR_I_BIT | PSR_F_BIT | SVC_MODE, r1 @ set SVC, irqs off |
de8e71ca RK |
94 | @ load phys pgd, stack, resume fn |
95 | ARM( ldmia r0!, {r1, sp, pc} ) | |
96 | THUMB( ldmia r0!, {r1, r2, r3} ) | |
97 | THUMB( mov sp, r2 ) | |
98 | THUMB( bx r3 ) | |
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99 | ENDPROC(cpu_resume) |
100 | ||
101 | sleep_save_sp: | |
941aefac RK |
102 | .rept CONFIG_NR_CPUS |
103 | .long 0 @ preserve stack phys ptr here | |
104 | .endr |