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/*
* from: vector.s, 386BSD 0.1 unknown origin
* $FreeBSD$
*/
#define IRQ_BIT(irq_num) (1 << ((irq_num) % 8))
#define IRQ_LBIT(irq_num) (1 << (irq_num))
#define IRQ_BYTE(irq_num) ((irq_num) >> 3)
#ifdef AUTO_EOI_1
#define ENABLE_ICU1 /* use auto-EOI to reduce i/o */
#define OUTB_ICU1
#else
#define ENABLE_ICU1 \
movb $ICU_EOI,%al ; /* as soon as possible send EOI ... */ \
OUTB_ICU1 /* ... to clear in service bit */
#define OUTB_ICU1 \
outb %al,$IO_ICU1
#endif
#ifdef AUTO_EOI_2
/*
* The data sheet says no auto-EOI on slave, but it sometimes works.
*/
#define ENABLE_ICU1_AND_2 ENABLE_ICU1
#else
#define ENABLE_ICU1_AND_2 \
movb $ICU_EOI,%al ; /* as above */ \
outb %al,$IO_ICU2 ; /* but do second icu first ... */ \
OUTB_ICU1 /* ... then first icu (if !AUTO_EOI_1) */
#endif
#define PUSH_FRAME \
pushl $0 ; /* dummy error code */ \
pushl $0 ; /* dummy trap type */ \
pushal ; /* 8 ints */ \
pushl %ds ; /* save data and extra segments ... */ \
pushl %es ; \
pushl %fs
#define PUSH_DUMMY \
pushfl ; /* eflags */ \
pushl %cs ; /* cs */ \
pushl 12(%esp) ; /* original caller eip */ \
pushl $0 ; /* dummy error code */ \
pushl $0 ; /* dummy trap type */ \
subl $11*4,%esp
#define POP_FRAME \
popl %fs ; \
popl %es ; \
popl %ds ; \
popal ; \
addl $4+4,%esp
#define POP_DUMMY \
addl $16*4,%esp
#define MASK_IRQ(icu, irq_num) \
movb imen + IRQ_BYTE(irq_num),%al ; \
orb $IRQ_BIT(irq_num),%al ; \
movb %al,imen + IRQ_BYTE(irq_num) ; \
outb %al,$icu+ICU_IMR_OFFSET
#define UNMASK_IRQ(icu, irq_num) \
movb imen + IRQ_BYTE(irq_num),%al ; \
andb $~IRQ_BIT(irq_num),%al ; \
movb %al,imen + IRQ_BYTE(irq_num) ; \
outb %al,$icu+ICU_IMR_OFFSET
/*
* Macros for interrupt interrupt entry, call to handler, and exit.
*/
#define FAST_INTR(irq_num, vec_name, icu, enable_icus) \
.text ; \
SUPERALIGN_TEXT ; \
IDTVEC(vec_name) ; \
PUSH_FRAME ; \
mov $KDSEL,%ax ; \
mov %ax,%ds ; \
mov %ax,%es ; \
mov $KPSEL,%ax ; \
mov %ax,%fs ; \
FAKE_MCOUNT((12+ACTUALLY_PUSHED)*4(%esp)) ; \
movl PCPU(CURTHREAD),%ebx ; \
cmpl $0,TD_CRITNEST(%ebx) ; \
je 1f ; \
; \
movl $1,PCPU(INT_PENDING) ; \
orl $IRQ_LBIT(irq_num),PCPU(FPENDING) ; \
MASK_IRQ(icu, irq_num) ; \
enable_icus ; \
jmp 10f ; \
1: ; \
incl TD_CRITNEST(%ebx) ; \
incl TD_INTR_NESTING_LEVEL(%ebx) ; \
pushl intr_unit + (irq_num) * 4 ; \
call *intr_handler + (irq_num) * 4 ; \
addl $4,%esp ; \
enable_icus ; \
incl cnt+V_INTR ; /* book-keeping can wait */ \
movl intr_countp + (irq_num) * 4,%eax ; \
incl (%eax) ; \
decl TD_CRITNEST(%ebx) ; \
cmpl $0,PCPU(INT_PENDING) ; \
je 2f ; \
; \
call i386_unpend ; \
2: ; \
decl TD_INTR_NESTING_LEVEL(%ebx) ; \
10: ; \
MEXITCOUNT ; \
jmp doreti
/*
* Restart a fast interrupt that was held up by a critical section.
* This routine is called from unpend(). unpend() ensures we are
* in a critical section and deals with the interrupt nesting level
* for us. If we previously masked the irq, we have to unmask it.
*
* We have a choice. We can regenerate the irq using the 'int'
* instruction or we can create a dummy frame and call the interrupt
* handler directly. I've chosen to use the dummy-frame method.
*/
#define FAST_UNPEND(irq_num, vec_name, icu) \
.text ; \
SUPERALIGN_TEXT ; \
IDTVEC(vec_name) ; \
; \
pushl %ebp ; \
movl %esp, %ebp ; \
PUSH_DUMMY ; \
pushl intr_unit + (irq_num) * 4 ; \
call *intr_handler + (irq_num) * 4 ; /* do the work ASAP */ \
addl $4, %esp ; \
incl cnt+V_INTR ; /* book-keeping can wait */ \
movl intr_countp + (irq_num) * 4,%eax ; \
incl (%eax) ; \
UNMASK_IRQ(icu, irq_num) ; \
POP_DUMMY ; \
popl %ebp ; \
ret
/*
* Slow, threaded interrupts.
*
* XXX Most of the parameters here are obsolete. Fix this when we're
* done.
* XXX we really shouldn't return via doreti if we just schedule the
* interrupt handler and don't run anything. We could just do an
* iret. FIXME.
*/
#define INTR(irq_num, vec_name, icu, enable_icus, maybe_extra_ipending) \
.text ; \
SUPERALIGN_TEXT ; \
IDTVEC(vec_name) ; \
PUSH_FRAME ; \
mov $KDSEL,%ax ; /* load kernel ds, es and fs */ \
mov %ax,%ds ; \
mov %ax,%es ; \
mov $KPSEL,%ax ; \
mov %ax,%fs ; \
; \
maybe_extra_ipending ; \
MASK_IRQ(icu, irq_num) ; \
enable_icus ; \
; \
movl PCPU(CURTHREAD),%ebx ; \
cmpl $0,TD_CRITNEST(%ebx) ; \
je 1f ; \
movl $1,PCPU(INT_PENDING); \
orl $IRQ_LBIT(irq_num),PCPU(IPENDING) ; \
jmp 10f ; \
1: ; \
incl TD_INTR_NESTING_LEVEL(%ebx) ; \
; \
FAKE_MCOUNT(13*4(%esp)) ; /* XXX late to avoid double count */ \
cmpl $0,PCPU(INT_PENDING) ; \
je 9f ; \
call i386_unpend ; \
9: ; \
pushl $irq_num; /* pass the IRQ */ \
call sched_ithd ; \
addl $4, %esp ; /* discard the parameter */ \
; \
decl TD_INTR_NESTING_LEVEL(%ebx) ; \
10: ; \
MEXITCOUNT ; \
jmp doreti
MCOUNT_LABEL(bintr)
FAST_INTR(0,fastintr0, IO_ICU1, ENABLE_ICU1)
FAST_INTR(1,fastintr1, IO_ICU1, ENABLE_ICU1)
FAST_INTR(2,fastintr2, IO_ICU1, ENABLE_ICU1)
FAST_INTR(3,fastintr3, IO_ICU1, ENABLE_ICU1)
FAST_INTR(4,fastintr4, IO_ICU1, ENABLE_ICU1)
FAST_INTR(5,fastintr5, IO_ICU1, ENABLE_ICU1)
FAST_INTR(6,fastintr6, IO_ICU1, ENABLE_ICU1)
FAST_INTR(7,fastintr7, IO_ICU1, ENABLE_ICU1)
FAST_INTR(8,fastintr8, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(9,fastintr9, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(10,fastintr10, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(11,fastintr11, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(12,fastintr12, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(13,fastintr13, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(14,fastintr14, IO_ICU2, ENABLE_ICU1_AND_2)
FAST_INTR(15,fastintr15, IO_ICU2, ENABLE_ICU1_AND_2)
#define CLKINTR_PENDING movl $1,CNAME(clkintr_pending)
/* Threaded interrupts */
INTR(0,intr0, IO_ICU1, ENABLE_ICU1, CLKINTR_PENDING)
INTR(1,intr1, IO_ICU1, ENABLE_ICU1,)
INTR(2,intr2, IO_ICU1, ENABLE_ICU1,)
INTR(3,intr3, IO_ICU1, ENABLE_ICU1,)
INTR(4,intr4, IO_ICU1, ENABLE_ICU1,)
INTR(5,intr5, IO_ICU1, ENABLE_ICU1,)
INTR(6,intr6, IO_ICU1, ENABLE_ICU1,)
INTR(7,intr7, IO_ICU1, ENABLE_ICU1,)
INTR(8,intr8, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(9,intr9, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(10,intr10, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(11,intr11, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(12,intr12, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(13,intr13, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(14,intr14, IO_ICU2, ENABLE_ICU1_AND_2,)
INTR(15,intr15, IO_ICU2, ENABLE_ICU1_AND_2,)
FAST_UNPEND(0,fastunpend0, IO_ICU1)
FAST_UNPEND(1,fastunpend1, IO_ICU1)
FAST_UNPEND(2,fastunpend2, IO_ICU1)
FAST_UNPEND(3,fastunpend3, IO_ICU1)
FAST_UNPEND(4,fastunpend4, IO_ICU1)
FAST_UNPEND(5,fastunpend5, IO_ICU1)
FAST_UNPEND(6,fastunpend6, IO_ICU1)
FAST_UNPEND(7,fastunpend7, IO_ICU1)
FAST_UNPEND(8,fastunpend8, IO_ICU2)
FAST_UNPEND(9,fastunpend9, IO_ICU2)
FAST_UNPEND(10,fastunpend10, IO_ICU2)
FAST_UNPEND(11,fastunpend11, IO_ICU2)
FAST_UNPEND(12,fastunpend12, IO_ICU2)
FAST_UNPEND(13,fastunpend13, IO_ICU2)
FAST_UNPEND(14,fastunpend14, IO_ICU2)
FAST_UNPEND(15,fastunpend15, IO_ICU2)
MCOUNT_LABEL(eintr)
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