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0db34215c7
To support multiple TC microthreads acting as "CPUs" within a VPE, VPE-wide interrupt mask bits must be specially manipulated during interrupt handling. To support legacy drivers and interrupt controller management code, SMTC has a "backstop" to track and if necessary restore the interrupt mask. This has some performance impact on interrupt service overhead. Disable it only if you know what you are doing. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
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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 by Waldorf GMBH, written by Ralf Baechle
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* Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
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*/
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#ifndef _ASM_IRQ_H
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#define _ASM_IRQ_H
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#include <linux/linkage.h>
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#include <asm/mipsmtregs.h>
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#include <irq.h>
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#ifdef CONFIG_I8259
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static inline int irq_canonicalize(int irq)
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{
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return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
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}
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#else
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#define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
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#endif
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#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
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/*
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* Clear interrupt mask handling "backstop" if irq_hwmask
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* entry so indicates. This implies that the ack() or end()
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* functions will take over re-enabling the low-level mask.
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* Otherwise it will be done on return from exception.
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*/
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#define __DO_IRQ_SMTC_HOOK(irq) \
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do { \
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if (irq_hwmask[irq] & 0x0000ff00) \
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write_c0_tccontext(read_c0_tccontext() & \
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~(irq_hwmask[irq] & 0x0000ff00)); \
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} while (0)
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#else
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#define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
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#endif
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/*
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* do_IRQ handles all normal device IRQ's (the special
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*
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* Ideally there should be away to get this into kernel/irq/handle.c to
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* avoid the overhead of a call for just a tiny function ...
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*/
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#define do_IRQ(irq) \
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do { \
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irq_enter(); \
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__DO_IRQ_SMTC_HOOK(irq); \
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generic_handle_irq(irq); \
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irq_exit(); \
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} while (0)
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extern void arch_init_irq(void);
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extern void spurious_interrupt(void);
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#ifdef CONFIG_MIPS_MT_SMTC
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struct irqaction;
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extern unsigned long irq_hwmask[];
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extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
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unsigned long hwmask);
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#endif /* CONFIG_MIPS_MT_SMTC */
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extern int allocate_irqno(void);
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extern void alloc_legacy_irqno(void);
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extern void free_irqno(unsigned int irq);
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/*
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* Before R2 the timer and performance counter interrupts were both fixed to
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* IE7. Since R2 their number has to be read from the c0_intctl register.
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*/
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#define CP0_LEGACY_COMPARE_IRQ 7
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extern int cp0_compare_irq;
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extern int cp0_perfcount_irq;
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#endif /* _ASM_IRQ_H */
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