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185 lines
4.1 KiB
185 lines
4.1 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle |
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* Copyright (C) 1996 by Paul M. Antoine |
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* Copyright (C) 1999 Silicon Graphics |
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* Copyright (C) 2000 MIPS Technologies, Inc. |
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*/ |
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#ifndef _ASM_IRQFLAGS_H |
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#define _ASM_IRQFLAGS_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/compiler.h> |
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#include <linux/stringify.h> |
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#include <asm/compiler.h> |
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#include <asm/hazards.h> |
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#if defined(CONFIG_CPU_HAS_DIEI) |
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static inline void arch_local_irq_disable(void) |
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{ |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set noat \n" |
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" di \n" |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: /* no outputs */ |
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: /* no inputs */ |
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: "memory"); |
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} |
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static inline unsigned long arch_local_irq_save(void) |
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{ |
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unsigned long flags; |
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asm __volatile__( |
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" .set push \n" |
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" .set reorder \n" |
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" .set noat \n" |
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#if defined(CONFIG_CPU_LOONGSON64) || defined(CONFIG_CPU_LOONGSON32) |
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" mfc0 %[flags], $12 \n" |
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" di \n" |
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#else |
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" di %[flags] \n" |
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#endif |
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" andi %[flags], 1 \n" |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: [flags] "=r" (flags) |
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: /* no inputs */ |
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: "memory"); |
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return flags; |
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} |
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static inline void arch_local_irq_restore(unsigned long flags) |
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{ |
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unsigned long __tmp1; |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set noreorder \n" |
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" .set noat \n" |
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#if defined(CONFIG_IRQ_MIPS_CPU) |
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/* |
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* Slow, but doesn't suffer from a relatively unlikely race |
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* condition we're having since days 1. |
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*/ |
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" beqz %[flags], 1f \n" |
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" di \n" |
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" ei \n" |
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"1: \n" |
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#else |
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/* |
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* Fast, dangerous. Life is fun, life is good. |
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*/ |
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" mfc0 $1, $12 \n" |
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" ins $1, %[flags], 0, 1 \n" |
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" mtc0 $1, $12 \n" |
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#endif |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: [flags] "=r" (__tmp1) |
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: "0" (flags) |
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: "memory"); |
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} |
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#else |
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/* Functions that require preempt_{dis,en}able() are in mips-atomic.c */ |
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void arch_local_irq_disable(void); |
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unsigned long arch_local_irq_save(void); |
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void arch_local_irq_restore(unsigned long flags); |
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#endif /* CONFIG_CPU_HAS_DIEI */ |
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static inline void arch_local_irq_enable(void) |
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{ |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set reorder \n" |
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" .set noat \n" |
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#if defined(CONFIG_CPU_HAS_DIEI) |
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" ei \n" |
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#else |
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" mfc0 $1,$12 \n" |
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" ori $1,0x1f \n" |
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" xori $1,0x1e \n" |
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" mtc0 $1,$12 \n" |
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#endif |
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" " __stringify(__irq_enable_hazard) " \n" |
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" .set pop \n" |
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: /* no outputs */ |
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: /* no inputs */ |
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: "memory"); |
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} |
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static inline unsigned long arch_local_save_flags(void) |
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{ |
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unsigned long flags; |
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asm __volatile__( |
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" .set push \n" |
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" .set reorder \n" |
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" mfc0 %[flags], $12 \n" |
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" .set pop \n" |
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: [flags] "=r" (flags)); |
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return flags; |
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} |
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static inline int arch_irqs_disabled_flags(unsigned long flags) |
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{ |
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return !(flags & 1); |
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} |
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static inline int arch_irqs_disabled(void) |
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{ |
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return arch_irqs_disabled_flags(arch_local_save_flags()); |
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} |
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#endif /* #ifndef __ASSEMBLY__ */ |
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/* |
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* Do the CPU's IRQ-state tracing from assembly code. |
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*/ |
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#ifdef CONFIG_TRACE_IRQFLAGS |
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/* Reload some registers clobbered by trace_hardirqs_on */ |
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#ifdef CONFIG_64BIT |
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# define TRACE_IRQS_RELOAD_REGS \ |
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LONG_L $11, PT_R11(sp); \ |
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LONG_L $10, PT_R10(sp); \ |
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LONG_L $9, PT_R9(sp); \ |
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LONG_L $8, PT_R8(sp); \ |
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LONG_L $7, PT_R7(sp); \ |
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LONG_L $6, PT_R6(sp); \ |
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LONG_L $5, PT_R5(sp); \ |
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LONG_L $4, PT_R4(sp); \ |
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LONG_L $2, PT_R2(sp) |
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#else |
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# define TRACE_IRQS_RELOAD_REGS \ |
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LONG_L $7, PT_R7(sp); \ |
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LONG_L $6, PT_R6(sp); \ |
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LONG_L $5, PT_R5(sp); \ |
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LONG_L $4, PT_R4(sp); \ |
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LONG_L $2, PT_R2(sp) |
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#endif |
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# define TRACE_IRQS_ON \ |
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CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \ |
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jal trace_hardirqs_on |
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# define TRACE_IRQS_ON_RELOAD \ |
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TRACE_IRQS_ON; \ |
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TRACE_IRQS_RELOAD_REGS |
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# define TRACE_IRQS_OFF \ |
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jal trace_hardirqs_off |
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#else |
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# define TRACE_IRQS_ON |
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# define TRACE_IRQS_ON_RELOAD |
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# define TRACE_IRQS_OFF |
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#endif |
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#endif /* _ASM_IRQFLAGS_H */
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