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Diffstat (limited to 'arch/mips/include/asm/irqflags.h')
| -rw-r--r-- | arch/mips/include/asm/irqflags.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/mips/include/asm/irqflags.h b/arch/mips/include/asm/irqflags.h new file mode 100644 index 000000000..9d3610be2 --- /dev/null +++ b/arch/mips/include/asm/irqflags.h @@ -0,0 +1,180 @@ +/* + * 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 <linux/stringify.h> +#include <asm/compiler.h> +#include <asm/hazards.h> + +#if defined(CONFIG_CPU_MIPSR2) || defined (CONFIG_CPU_MIPSR6) + +static inline void arch_local_irq_disable(void) +{ + __asm__ __volatile__( + " .set push \n" + " .set noat \n" + " di \n" + " " __stringify(__irq_disable_hazard) " \n" + " .set pop \n" + : /* no outputs */ + : /* no inputs */ + : "memory"); +} + +static inline unsigned long arch_local_irq_save(void) +{ + unsigned long flags; + + asm __volatile__( + " .set push \n" + " .set reorder \n" + " .set noat \n" +#if defined(CONFIG_CPU_LOONGSON3) + " mfc0 %[flags], $12 \n" + " di \n" +#else + " di %[flags] \n" +#endif + " andi %[flags], 1 \n" + " " __stringify(__irq_disable_hazard) " \n" + " .set pop \n" + : [flags] "=r" (flags) + : /* no inputs */ + : "memory"); + + return flags; +} + +static inline void arch_local_irq_restore(unsigned long flags) +{ + unsigned long __tmp1; + + __asm__ __volatile__( + " .set push \n" + " .set noreorder \n" + " .set noat \n" +#if defined(CONFIG_IRQ_MIPS_CPU) + /* + * Slow, but doesn't suffer from a relatively unlikely race + * condition we're having since days 1. + */ + " beqz %[flags], 1f \n" + " di \n" + " ei \n" + "1: \n" +#else + /* + * Fast, dangerous. Life is fun, life is good. + */ + " mfc0 $1, $12 \n" + " ins $1, %[flags], 0, 1 \n" + " mtc0 $1, $12 \n" +#endif + " " __stringify(__irq_disable_hazard) " \n" + " .set pop \n" + : [flags] "=r" (__tmp1) + : "0" (flags) + : "memory"); +} + +#else +/* Functions that require preempt_{dis,en}able() are in mips-atomic.c */ +void arch_local_irq_disable(void); +unsigned long arch_local_irq_save(void); +void arch_local_irq_restore(unsigned long flags); +#endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */ + +static inline void arch_local_irq_enable(void) +{ + __asm__ __volatile__( + " .set push \n" + " .set reorder \n" + " .set noat \n" +#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) + " ei \n" +#else + " mfc0 $1,$12 \n" + " ori $1,0x1f \n" + " xori $1,0x1e \n" + " mtc0 $1,$12 \n" +#endif + " " __stringify(__irq_enable_hazard) " \n" + " .set pop \n" + : /* no outputs */ + : /* no inputs */ + : "memory"); +} + +static inline unsigned long arch_local_save_flags(void) +{ + unsigned long flags; + + asm __volatile__( + " .set push \n" + " .set reorder \n" + " mfc0 %[flags], $12 \n" + " .set pop \n" + : [flags] "=r" (flags)); + + return flags; +} + + +static inline int arch_irqs_disabled_flags(unsigned long flags) +{ + return !(flags & 1); +} + +#endif /* #ifndef __ASSEMBLY__ */ + +/* + * 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 */ |