nuclear@11: 	.data
nuclear@11: 	.align 4
nuclear@11: 	.short 0
nuclear@11: /* memory reserved for set_idt */
nuclear@11: lim:.short 0
nuclear@11: addr:.long 0
nuclear@11: 
nuclear@11: 	.text
nuclear@11: /* set_idt(uint32_t addr, uint16_t limit)
nuclear@11:  * loads the IDTR with the new address and limit for the IDT */
nuclear@11: 	.globl set_idt
nuclear@11: set_idt:
nuclear@11: 	movl 4(%esp), %eax
nuclear@11: 	movl %eax, (addr)
nuclear@11: 	movw 8(%esp), %ax
nuclear@11: 	movw %ax, (lim)
nuclear@11: 	lidt (lim)
nuclear@11: 	ret
nuclear@11: 
nuclear@25: /* get_intr_state()
nuclear@25:  * returns 1 if interrutps are enabled, 0 if disabled */
nuclear@25: 	.globl get_intr_state
nuclear@25: get_intr_state:
nuclear@25: 	pushf
nuclear@25: 	popl %eax
nuclear@25: 	shr $9, %eax  /* bit 9 of eflags is IF */
nuclear@25: 	andl $1, %eax
nuclear@25: 	ret
nuclear@25: 
nuclear@25: /* set_intr_state(int state)
nuclear@25:  * enables interrupts if the argument is non-zero, disables them otherwise */
nuclear@25: 	.globl set_intr_state
nuclear@25: set_intr_state:
nuclear@25: 	cmpl $0, 4(%esp)
nuclear@25: 	jz 0f
nuclear@25: 	sti
nuclear@25: 	ret
nuclear@25: 0:	cli
nuclear@25: 	ret
nuclear@25: 
nuclear@25: 
nuclear@11: /* interrupt entry with error code macro
nuclear@11:  * this macro generates an interrupt entry point for the
nuclear@11:  * exceptions which include error codes in the stack frame
nuclear@11:  */
nuclear@11: 	.macro ientry_err n name
nuclear@11: 	.globl intr_entry_\name
nuclear@11: intr_entry_\name:
nuclear@11: 	pushl $\n
nuclear@11: 	jmp intr_entry_common
nuclear@11: 	.endm
nuclear@11: 
nuclear@11: /* interrupt entry without error code macro
nuclear@11:  * this macro generates an interrupt entry point for the interrupts
nuclear@11:  * and exceptions which do not include error codes in the stack frame
nuclear@11:  * it pushes a dummy error code (0), to make the stack frame identical
nuclear@11:  */
nuclear@11: 	.macro ientry_noerr n name
nuclear@11: 	.globl intr_entry_\name
nuclear@11: intr_entry_\name:
nuclear@11: 	pushl $0
nuclear@11: 	pushl $\n
nuclear@11: 	jmp intr_entry_common
nuclear@11: 	.endm
nuclear@11: 
nuclear@11: /* common code used by all entry points. calls dispatch_intr()
nuclear@11:  * defined in intr.c
nuclear@11:  */
nuclear@11: 	.extern dispatch_intr
nuclear@11: intr_entry_common:
nuclear@11: 	pusha
nuclear@11: 	call dispatch_intr
nuclear@11: 	popa
nuclear@11: 	/* remove error code and intr num from stack */
nuclear@11: 	add $8, %esp
nuclear@11: 	iret
nuclear@11: 
nuclear@11: /* by including interrupts.h with ASM defined, the macros above
nuclear@11:  * are expanded to generate all required interrupt entry points
nuclear@11:  */
nuclear@11: #define ASM
nuclear@11: #include <interrupts.h>