1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/intr-asm.S	Sat Feb 19 04:41:51 2011 +0200
     1.3 @@ -0,0 +1,60 @@
     1.4 +	.data
     1.5 +	.align 4
     1.6 +	.short 0
     1.7 +/* memory reserved for set_idt */
     1.8 +lim:.short 0
     1.9 +addr:.long 0
    1.10 +
    1.11 +	.text
    1.12 +/* set_idt(uint32_t addr, uint16_t limit)
    1.13 + * loads the IDTR with the new address and limit for the IDT */
    1.14 +	.globl set_idt
    1.15 +set_idt:
    1.16 +	movl 4(%esp), %eax
    1.17 +	movl %eax, (addr)
    1.18 +	movw 8(%esp), %ax
    1.19 +	movw %ax, (lim)
    1.20 +	lidt (lim)
    1.21 +	ret
    1.22 +
    1.23 +/* interrupt entry with error code macro
    1.24 + * this macro generates an interrupt entry point for the
    1.25 + * exceptions which include error codes in the stack frame
    1.26 + */
    1.27 +	.macro ientry_err n name
    1.28 +	.globl intr_entry_\name
    1.29 +intr_entry_\name:
    1.30 +	pushl $\n
    1.31 +	jmp intr_entry_common
    1.32 +	.endm
    1.33 +
    1.34 +/* interrupt entry without error code macro
    1.35 + * this macro generates an interrupt entry point for the interrupts
    1.36 + * and exceptions which do not include error codes in the stack frame
    1.37 + * it pushes a dummy error code (0), to make the stack frame identical
    1.38 + */
    1.39 +	.macro ientry_noerr n name
    1.40 +	.globl intr_entry_\name
    1.41 +intr_entry_\name:
    1.42 +	pushl $0
    1.43 +	pushl $\n
    1.44 +	jmp intr_entry_common
    1.45 +	.endm
    1.46 +
    1.47 +/* common code used by all entry points. calls dispatch_intr()
    1.48 + * defined in intr.c
    1.49 + */
    1.50 +	.extern dispatch_intr
    1.51 +intr_entry_common:
    1.52 +	pusha
    1.53 +	call dispatch_intr
    1.54 +	popa
    1.55 +	/* remove error code and intr num from stack */
    1.56 +	add $8, %esp
    1.57 +	iret
    1.58 +
    1.59 +/* by including interrupts.h with ASM defined, the macros above
    1.60 + * are expanded to generate all required interrupt entry points
    1.61 + */
    1.62 +#define ASM
    1.63 +#include <interrupts.h>