d04c56f73c
This implements a lazy strategy for disabling interrupts. This means that local_irq_disable() et al. just clear the 'interrupts are enabled' flag in the paca. If an interrupt comes along, the interrupt entry code notices that interrupts are supposed to be disabled, and clears the EE bit in SRR1, clears the 'interrupts are hard-enabled' flag in the paca, and returns. This means that interrupts only actually get disabled in the processor when an interrupt comes along. When interrupts are enabled by local_irq_enable() et al., the code sets the interrupts-enabled flag in the paca, and then checks whether interrupts got hard-disabled. If so, it also sets the EE bit in the MSR to hard-enable the interrupts. This has the potential to improve performance, and also makes it easier to make a kernel that can boot on iSeries and on other 64-bit machines, since this lazy-disable strategy is very similar to the soft-disable strategy that iSeries already uses. This version renames paca->proc_enabled to paca->soft_enabled, and changes a couple of soft-disables in the kexec code to hard-disables, which should fix the crash that Michael Ellerman saw. This doesn't yet use a reserved CR field for the soft_enabled and hard_enabled flags. This applies on top of Stephen Rothwell's patches to make it possible to build a combined iSeries/other kernel. Signed-off-by: Paul Mackerras <paulus@samba.org>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
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*/
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#ifndef _ASM_POWERPC_HW_IRQ_H
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#define _ASM_POWERPC_HW_IRQ_H
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#ifdef __KERNEL__
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#include <linux/errno.h>
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#include <linux/compiler.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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extern void timer_interrupt(struct pt_regs *);
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#ifdef CONFIG_PPC64
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#include <asm/paca.h>
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static inline unsigned long local_get_flags(void)
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{
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return get_paca()->soft_enabled;
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}
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static inline unsigned long local_irq_disable(void)
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{
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unsigned long flag = get_paca()->soft_enabled;
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get_paca()->soft_enabled = 0;
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barrier();
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return flag;
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}
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extern void local_irq_restore(unsigned long);
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extern void iseries_handle_interrupts(void);
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#define local_irq_enable() local_irq_restore(1)
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#define local_save_flags(flags) ((flags) = local_get_flags())
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#define local_irq_save(flags) ((flags) = local_irq_disable())
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#define irqs_disabled() (local_get_flags() == 0)
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#define hard_irq_enable() __mtmsrd(mfmsr() | MSR_EE, 1)
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#define hard_irq_disable() __mtmsrd(mfmsr() & ~MSR_EE, 1)
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#else
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#if defined(CONFIG_BOOKE)
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#define SET_MSR_EE(x) mtmsr(x)
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#define local_irq_restore(flags) __asm__ __volatile__("wrtee %0" : : "r" (flags) : "memory")
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#else
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#define SET_MSR_EE(x) mtmsr(x)
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#define local_irq_restore(flags) mtmsr(flags)
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#endif
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static inline void local_irq_disable(void)
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{
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#ifdef CONFIG_BOOKE
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__asm__ __volatile__("wrteei 0": : :"memory");
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#else
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unsigned long msr;
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__asm__ __volatile__("": : :"memory");
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msr = mfmsr();
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SET_MSR_EE(msr & ~MSR_EE);
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#endif
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}
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static inline void local_irq_enable(void)
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{
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#ifdef CONFIG_BOOKE
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__asm__ __volatile__("wrteei 1": : :"memory");
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#else
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unsigned long msr;
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__asm__ __volatile__("": : :"memory");
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msr = mfmsr();
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SET_MSR_EE(msr | MSR_EE);
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#endif
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}
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static inline void local_irq_save_ptr(unsigned long *flags)
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{
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unsigned long msr;
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msr = mfmsr();
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*flags = msr;
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#ifdef CONFIG_BOOKE
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__asm__ __volatile__("wrteei 0": : :"memory");
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#else
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SET_MSR_EE(msr & ~MSR_EE);
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#endif
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__asm__ __volatile__("": : :"memory");
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}
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#define local_save_flags(flags) ((flags) = mfmsr())
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#define local_irq_save(flags) local_irq_save_ptr(&flags)
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#define irqs_disabled() ((mfmsr() & MSR_EE) == 0)
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#endif /* CONFIG_PPC64 */
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#define mask_irq(irq) \
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({ \
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irq_desc_t *desc = get_irq_desc(irq); \
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if (desc->chip && desc->chip->disable) \
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desc->chip->disable(irq); \
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})
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#define unmask_irq(irq) \
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({ \
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irq_desc_t *desc = get_irq_desc(irq); \
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if (desc->chip && desc->chip->enable) \
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desc->chip->enable(irq); \
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})
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#define ack_irq(irq) \
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({ \
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irq_desc_t *desc = get_irq_desc(irq); \
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if (desc->chip && desc->chip->ack) \
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desc->chip->ack(irq); \
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})
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/*
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* interrupt-retrigger: should we handle this via lost interrupts and IPIs
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* or should we not care like we do now ? --BenH.
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*/
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struct hw_interrupt_type;
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_HW_IRQ_H */
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