diff options
Diffstat (limited to 'x86_64/interrupt.S')
| -rw-r--r-- | x86_64/interrupt.S | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/x86_64/interrupt.S b/x86_64/interrupt.S new file mode 100644 index 0000000..6fb7772 --- /dev/null +++ b/x86_64/interrupt.S @@ -0,0 +1,140 @@ +/* + * Copyright (c) 1995 Shantanu Goel + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + */ + +#include <mach/machine/asm.h> + +#include <i386/ipl.h> +#ifdef APIC +# include <i386/apic.h> +#else +# include <i386/pic.h> +#endif +#include <i386/i386asm.h> + +#define READ_ISR (OCW_TEMPLATE|READ_NEXT_RD|READ_IS_ONRD) + +/* + * Generic interrupt handler. + * + * On entry, %eax contains the irq number. + * + * Note: kdb_kintr needs to know our stack usage + */ + +#define S_REGS 24(%rsp) +#define S_RET 16(%rsp) +#define S_IRQ 8(%rsp) +#define S_IPL 0(%rsp) + +ENTRY(interrupt) +#ifdef APIC + cmpl $255,%eax /* was this a spurious intr? */ + jne 1f + ret /* if so, just return */ +1: +#endif + subq $16,%rsp /* Two local variables */ + movl %eax,S_IRQ /* save irq number */ + + call spl7 /* set ipl */ + movl %eax,S_IPL /* save previous ipl */ + + movl S_IRQ,%ecx /* restore irq number */ + +#if NCPUS > 1 + cmpl $CALL_PMAP_UPDATE,%ecx /* was this a SMP pmap_update request? */ + je _call_single + + cmpl $CALL_AST_CHECK,%ecx /* was this a SMP remote -> local ast request? */ + je _call_local_ast +#endif + +#ifndef APIC + movl $1,%eax + shll %cl,%eax /* get corresponding IRQ mask */ + orl EXT(curr_pic_mask),%eax /* add current mask */ + + cmpl $8,%ecx /* do we need to ack slave? */ + jl 1f /* no, only master */ + + /* EOI on slave */ + movb %ah,%al + outb %al,$(PIC_SLAVE_OCW) /* mask slave out */ + + movb $(SPECIFIC_EOI),%al /* specific EOI for this irq */ + andb $7,%cl /* irq number for the slave */ + orb %cl,%al /* combine them */ + outb %al,$(PIC_SLAVE_ICW) /* ack interrupt to slave */ + + movb $(SPECIFIC_EOI + I_AM_SLAVE_2),%al /* specific master EOI for cascaded slave */ + outb %al,$(PIC_MASTER_ICW) /* ack interrupt to master */ + + movl EXT(curr_pic_mask),%eax /* restore original mask */ + movb %ah,%al + outb %al,$(PIC_SLAVE_OCW) /* unmask slave */ + jmp 2f + +1: + /* EOI on master */ + outb %al,$(PIC_MASTER_OCW) /* mask master out */ + + movb $(SPECIFIC_EOI),%al /* specific EOI for this irq */ + orb %cl,%al /* combine with irq number */ + outb %al,$(PIC_MASTER_ICW) /* ack interrupt to master */ + + movl EXT(curr_pic_mask),%eax /* restore original mask */ + outb %al,$(PIC_MASTER_OCW) /* unmask master */ +2: +#else + movl %ecx,%edi /* load irq number as 1st arg */ + call EXT(ioapic_irq_eoi) /* ioapic irq specific EOI */ +#endif + + ; + movq S_IPL,S_ARG1 /* previous ipl as 2nd arg */ + + ; + movq S_RET,S_ARG2 /* return address as 3th arg */ + + ; + movq S_REGS,S_ARG3 /* address of interrupted registers as 4th arg */ + + movl S_IRQ,%eax /* copy irq number */ + shll $2,%eax /* irq * 4 */ + movl EXT(iunit)(%rax),%edi /* get device unit number as 1st arg */ + + shll $1,%eax /* irq * 8 */ + call *EXT(ivect)(%rax) /* call interrupt handler */ + +_completed: + movl S_IPL,%edi /* restore previous ipl */ + call splx_cli /* restore previous ipl */ + + addq $16,%rsp /* pop local variables */ + ret + +#if NCPUS > 1 +_call_single: + call EXT(lapic_eoi) /* lapic EOI before the handler to allow extra update */ + call EXT(pmap_update_interrupt) + jmp _completed + +_call_local_ast: + call EXT(lapic_eoi) /* lapic EOI */ + call EXT(ast_check) /* AST check on this cpu */ + jmp _completed + +#endif +END(interrupt) |