fiqasm.S (1250B)
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 25ENTRY(__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 ret lr 36ENDPROC(__set_fiq_regs) 37 38ENTRY(__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 ret lr 49ENDPROC(__get_fiq_regs)