[PATCH] x86: increase interrupt vector range
Remove the limit of 256 interrupt vectors by changing the value stored in orig_{e,r}ax to be the complemented interrupt vector. The orig_{e,r}ax needs to be < 0 to allow the signal code to distinguish between return from interrupt and return from syscall. With this change applied, NR_IRQS can be > 256. Xen extends the IRQ numbering space to include room for dynamically allocated virtual interrupts (in the range 256-511), which requires a more permissive interface to do_IRQ. Signed-off-by: Ian Pratt <ian.pratt@xensource.com> Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -515,7 +515,7 @@ ENTRY(irq_entries_start)
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.if vector
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.if vector
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CFI_ADJUST_CFA_OFFSET -4
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CFI_ADJUST_CFA_OFFSET -4
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.endif
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.endif
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1: pushl $vector-256
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1: pushl $~(vector)
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CFI_ADJUST_CFA_OFFSET 4
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CFI_ADJUST_CFA_OFFSET 4
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jmp common_interrupt
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jmp common_interrupt
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.data
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.data
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@ -535,7 +535,7 @@ common_interrupt:
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#define BUILD_INTERRUPT(name, nr) \
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#define BUILD_INTERRUPT(name, nr) \
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ENTRY(name) \
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ENTRY(name) \
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RING0_INT_FRAME; \
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RING0_INT_FRAME; \
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pushl $nr-256; \
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pushl $~(nr); \
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CFI_ADJUST_CFA_OFFSET 4; \
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CFI_ADJUST_CFA_OFFSET 4; \
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SAVE_ALL; \
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SAVE_ALL; \
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movl %esp,%eax; \
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movl %esp,%eax; \
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@ -53,8 +53,8 @@ static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
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*/
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*/
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fastcall unsigned int do_IRQ(struct pt_regs *regs)
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fastcall unsigned int do_IRQ(struct pt_regs *regs)
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{
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{
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/* high bits used in ret_from_ code */
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/* high bit used in ret_from_ code */
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int irq = regs->orig_eax & 0xff;
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int irq = ~regs->orig_eax;
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#ifdef CONFIG_4KSTACKS
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#ifdef CONFIG_4KSTACKS
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union irq_ctx *curctx, *irqctx;
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union irq_ctx *curctx, *irqctx;
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u32 *isp;
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u32 *isp;
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@ -588,7 +588,7 @@ END(common_interrupt)
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*/
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*/
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.macro apicinterrupt num,func
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.macro apicinterrupt num,func
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INTR_FRAME
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INTR_FRAME
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pushq $\num-256
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pushq $~(\num)
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CFI_ADJUST_CFA_OFFSET 8
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CFI_ADJUST_CFA_OFFSET 8
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interrupt \func
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interrupt \func
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jmp ret_from_intr
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jmp ret_from_intr
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@ -115,8 +115,8 @@ skip:
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*/
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*/
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asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
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asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
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{
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{
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/* high bits used in ret_from_ code */
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/* high bit used in ret_from_ code */
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unsigned irq = regs->orig_rax & 0xff;
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unsigned irq = ~regs->orig_rax;
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exit_idle();
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exit_idle();
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irq_enter();
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irq_enter();
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@ -135,10 +135,10 @@ asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
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cpu = smp_processor_id();
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cpu = smp_processor_id();
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/*
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/*
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* orig_rax contains the interrupt vector - 256.
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* orig_rax contains the negated interrupt vector.
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* Use that to determine where the sender put the data.
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* Use that to determine where the sender put the data.
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*/
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*/
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sender = regs->orig_rax + 256 - INVALIDATE_TLB_VECTOR_START;
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sender = ~regs->orig_rax - INVALIDATE_TLB_VECTOR_START;
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f = &per_cpu(flush_state, sender);
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f = &per_cpu(flush_state, sender);
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if (!cpu_isset(cpu, f->flush_cpumask))
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if (!cpu_isset(cpu, f->flush_cpumask))
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@ -124,7 +124,7 @@ asmlinkage void IRQ_NAME(nr); \
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__asm__( \
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__asm__( \
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"\n.p2align\n" \
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"\n.p2align\n" \
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"IRQ" #nr "_interrupt:\n\t" \
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"IRQ" #nr "_interrupt:\n\t" \
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"push $" #nr "-256 ; " \
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"push $~(" #nr ") ; " \
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"jmp common_interrupt");
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"jmp common_interrupt");
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#if defined(CONFIG_X86_IO_APIC)
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#if defined(CONFIG_X86_IO_APIC)
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