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Diffstat (limited to 'arch/mips/include/asm/irqflags.h')
-rw-r--r-- | arch/mips/include/asm/irqflags.h | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/arch/mips/include/asm/irqflags.h b/arch/mips/include/asm/irqflags.h new file mode 100644 index 0000000..701ec0b --- /dev/null +++ b/arch/mips/include/asm/irqflags.h @@ -0,0 +1,283 @@ +/* + * 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 <linux/compiler.h> +#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"); + +extern void smtc_ipi_replay(void); + +static inline void raw_local_irq_enable(void) +{ +#ifdef CONFIG_MIPS_MT_SMTC + /* + * SMTC kernel needs to do a software replay of queued + * IPIs, at the cost of call overhead on each local_irq_enable() + */ + smtc_ipi_replay(); +#endif + __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"); + + +static inline void raw_local_irq_restore(unsigned long flags) +{ + unsigned long __tmp1; + +#ifdef CONFIG_MIPS_MT_SMTC + /* + * SMTC kernel needs to do a software replay of queued + * IPIs, at the cost of branch and call overhead on each + * local_irq_restore() + */ + if (unlikely(!(flags & 0x0400))) + smtc_ipi_replay(); +#endif + + __asm__ __volatile__( + "raw_local_irq_restore\t%0" + : "=r" (__tmp1) + : "0" (flags) + : "memory"); +} + +static inline void __raw_local_irq_restore(unsigned long flags) +{ + unsigned long __tmp1; + + __asm__ __volatile__( + "raw_local_irq_restore\t%0" + : "=r" (__tmp1) + : "0" (flags) + : "memory"); +} + +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 +/* Reload some registers clobbered by trace_hardirqs_on */ +#ifdef CONFIG_64BIT +# define TRACE_IRQS_RELOAD_REGS \ + LONG_L $11, PT_R11(sp); \ + LONG_L $10, PT_R10(sp); \ + LONG_L $9, PT_R9(sp); \ + LONG_L $8, PT_R8(sp); \ + LONG_L $7, PT_R7(sp); \ + LONG_L $6, PT_R6(sp); \ + LONG_L $5, PT_R5(sp); \ + LONG_L $4, PT_R4(sp); \ + LONG_L $2, PT_R2(sp) +#else +# define TRACE_IRQS_RELOAD_REGS \ + LONG_L $7, PT_R7(sp); \ + LONG_L $6, PT_R6(sp); \ + LONG_L $5, PT_R5(sp); \ + LONG_L $4, PT_R4(sp); \ + LONG_L $2, PT_R2(sp) +#endif +# define TRACE_IRQS_ON \ + CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \ + jal trace_hardirqs_on +# define TRACE_IRQS_ON_RELOAD \ + TRACE_IRQS_ON; \ + TRACE_IRQS_RELOAD_REGS +# define TRACE_IRQS_OFF \ + jal trace_hardirqs_off +#else +# define TRACE_IRQS_ON +# define TRACE_IRQS_ON_RELOAD +# define TRACE_IRQS_OFF +#endif + +#endif /* _ASM_IRQFLAGS_H */ |