diff options
Diffstat (limited to 'arch/arm/kernel/fiqasm.S')
-rw-r--r-- | arch/arm/kernel/fiqasm.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/kernel/fiqasm.S b/arch/arm/kernel/fiqasm.S new file mode 100644 index 000000000000..207f9d652010 --- /dev/null +++ b/arch/arm/kernel/fiqasm.S | |||
@@ -0,0 +1,49 @@ | |||
1 | /* | ||
2 | * linux/arch/arm/kernel/fiqasm.S | ||
3 | * | ||
4 | * Derived from code originally in linux/arch/arm/kernel/fiq.c: | ||
5 | * | ||
6 | * Copyright (C) 1998 Russell King | ||
7 | * Copyright (C) 1998, 1999 Phil Blundell | ||
8 | * Copyright (C) 2011, Linaro Limited | ||
9 | * | ||
10 | * FIQ support written by Philip Blundell <philb@gnu.org>, 1998. | ||
11 | * | ||
12 | * FIQ support re-written by Russell King to be more generic | ||
13 | * | ||
14 | * v7/Thumb-2 compatibility modifications by Linaro Limited, 2011. | ||
15 | */ | ||
16 | |||
17 | #include <linux/linkage.h> | ||
18 | #include <asm/assembler.h> | ||
19 | |||
20 | /* | ||
21 | * Taking an interrupt in FIQ mode is death, so both these functions | ||
22 | * disable irqs for the duration. | ||
23 | */ | ||
24 | |||
25 | ENTRY(__set_fiq_regs) | ||
26 | mov r2, #PSR_I_BIT | PSR_F_BIT | FIQ_MODE | ||
27 | mrs r1, cpsr | ||
28 | msr cpsr_c, r2 @ select FIQ mode | ||
29 | mov r0, r0 @ avoid hazard prior to ARMv4 | ||
30 | ldmia r0!, {r8 - r12} | ||
31 | ldr sp, [r0], #4 | ||
32 | ldr lr, [r0] | ||
33 | msr cpsr_c, r1 @ return to SVC mode | ||
34 | mov r0, r0 @ avoid hazard prior to ARMv4 | ||
35 | mov pc, lr | ||
36 | ENDPROC(__set_fiq_regs) | ||
37 | |||
38 | ENTRY(__get_fiq_regs) | ||
39 | mov r2, #PSR_I_BIT | PSR_F_BIT | FIQ_MODE | ||
40 | mrs r1, cpsr | ||
41 | msr cpsr_c, r2 @ select FIQ mode | ||
42 | mov r0, r0 @ avoid hazard prior to ARMv4 | ||
43 | stmia r0!, {r8 - r12} | ||
44 | str sp, [r0], #4 | ||
45 | str lr, [r0] | ||
46 | msr cpsr_c, r1 @ return to SVC mode | ||
47 | mov r0, r0 @ avoid hazard prior to ARMv4 | ||
48 | mov pc, lr | ||
49 | ENDPROC(__get_fiq_regs) | ||