/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle * Copyright (C) 1996 by Paul M. Antoine * Copyright (C) 1999 Silicon Graphics * Copyright (C) 2000 MIPS Technologies, Inc. */ #ifndef _ASM_IRQFLAGS_H #define _ASM_IRQFLAGS_H #ifndef __ASSEMBLY__ #include <asm/hazards.h> __asm__ ( " .macro raw_local_irq_enable \n" " .set push \n" " .set reorder \n" " .set noat \n" #ifdef CONFIG_MIPS_MT_SMTC " mfc0 $1, $2, 1 # SMTC - clear TCStatus.IXMT \n" " ori $1, 0x400 \n" " xori $1, 0x400 \n" " mtc0 $1, $2, 1 \n" #elif defined(CONFIG_CPU_MIPSR2) " ei \n" #else " mfc0 $1,$12 \n" " ori $1,0x1f \n" " xori $1,0x1e \n" " mtc0 $1,$12 \n" #endif " irq_enable_hazard \n" " .set pop \n" " .endm"); static inline void raw_local_irq_enable(void) { __asm__ __volatile__( "raw_local_irq_enable" : /* no outputs */ : /* no inputs */ : "memory"); } /* * For cli() we have to insert nops to make sure that the new value * has actually arrived in the status register before the end of this * macro. * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs * no nops at all. */ /* * For TX49, operating only IE bit is not enough. * * If mfc0 $12 follows store and the mfc0 is last instruction of a * page and fetching the next instruction causes TLB miss, the result * of the mfc0 might wrongly contain EXL bit. * * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008 * * Workaround: mask EXL bit of the result or place a nop before mfc0. */ __asm__ ( " .macro raw_local_irq_disable\n" " .set push \n" " .set noat \n" #ifdef CONFIG_MIPS_MT_SMTC " mfc0 $1, $2, 1 \n" " ori $1, 0x400 \n" " .set noreorder \n" " mtc0 $1, $2, 1 \n" #elif defined(CONFIG_CPU_MIPSR2) " di \n" #else " mfc0 $1,$12 \n" " ori $1,0x1f \n" " xori $1,0x1f \n" " .set noreorder \n" " mtc0 $1,$12 \n" #endif " irq_disable_hazard \n" " .set pop \n" " .endm \n"); static inline void raw_local_irq_disable(void) { __asm__ __volatile__( "raw_local_irq_disable" : /* no outputs */ : /* no inputs */ : "memory"); } __asm__ ( " .macro raw_local_save_flags flags \n" " .set push \n" " .set reorder \n" #ifdef CONFIG_MIPS_MT_SMTC " mfc0 \\flags, $2, 1 \n" #else " mfc0 \\flags, $12 \n" #endif " .set pop \n" " .endm \n"); #define raw_local_save_flags(x) \ __asm__ __volatile__( \ "raw_local_save_flags %0" \ : "=r" (x)) __asm__ ( " .macro raw_local_irq_save result \n" " .set push \n" " .set reorder \n" " .set noat \n" #ifdef CONFIG_MIPS_MT_SMTC " mfc0 \\result, $2, 1 \n" " ori $1, \\result, 0x400 \n" " .set noreorder \n" " mtc0 $1, $2, 1 \n" " andi \\result, \\result, 0x400 \n" #elif defined(CONFIG_CPU_MIPSR2) " di \\result \n" " andi \\result, 1 \n" #else " mfc0 \\result, $12 \n" " ori $1, \\result, 0x1f \n" " xori $1, 0x1f \n" " .set noreorder \n" " mtc0 $1, $12 \n" #endif " irq_disable_hazard \n" " .set pop \n" " .endm \n"); #define raw_local_irq_save(x) \ __asm__ __volatile__( \ "raw_local_irq_save\t%0" \ : "=r" (x) \ : /* no inputs */ \ : "memory") __asm__ ( " .macro raw_local_irq_restore flags \n" " .set push \n" " .set noreorder \n" " .set noat \n" #ifdef CONFIG_MIPS_MT_SMTC "mfc0 $1, $2, 1 \n" "andi \\flags, 0x400 \n" "ori $1, 0x400 \n" "xori $1, 0x400 \n" "or \\flags, $1 \n" "mtc0 \\flags, $2, 1 \n" #elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU) /* * Slow, but doesn't suffer from a relativly unlikely race * condition we're having since days 1. */ " beqz \\flags, 1f \n" " di \n" " ei \n" "1: \n" #elif defined(CONFIG_CPU_MIPSR2) /* * Fast, dangerous. Life is fun, life is good. */ " mfc0 $1, $12 \n" " ins $1, \\flags, 0, 1 \n" " mtc0 $1, $12 \n" #else " mfc0 $1, $12 \n" " andi \\flags, 1 \n" " ori $1, 0x1f \n" " xori $1, 0x1f \n" " or \\flags, $1 \n" " mtc0 \\flags, $12 \n" #endif " irq_disable_hazard \n" " .set pop \n" " .endm \n"); #define raw_local_irq_restore(flags) \ do { \ unsigned long __tmp1; \ \ __asm__ __volatile__( \ "raw_local_irq_restore\t%0" \ : "=r" (__tmp1) \ : "0" (flags) \ : "memory"); \ } while(0) static inline int raw_irqs_disabled_flags(unsigned long flags) { #ifdef CONFIG_MIPS_MT_SMTC /* * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU */ return flags & 0x400; #else return !(flags & 1); #endif } #endif /* * Do the CPU's IRQ-state tracing from assembly code. */ #ifdef CONFIG_TRACE_IRQFLAGS # define TRACE_IRQS_ON \ jal trace_hardirqs_on # define TRACE_IRQS_OFF \ jal trace_hardirqs_off #else # define TRACE_IRQS_ON # define TRACE_IRQS_OFF #endif #endif /* _ASM_IRQFLAGS_H */