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NetBSD/sys/arch/arm/sa11x0/sa11x0_irq.S

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ArmAsm
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/* $NetBSD: sa11x0_irq.S,v 1.9 2006/03/05 11:30:58 peter Exp $ */
/*
* Copyright (c) 1998 Mark Brinicombe.
* Copyright (c) 1998 Causality Limited
* All rights reserved.
*
* This code is derived from software contributed to the NetBSD Foundation
* by IWAMOTO Toshihiro.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "opt_irqstats.h"
#include "assym.h"
#include <machine/asm.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <arm/sa11x0/sa11x0_reg.h>
.text
.align 0
Lcurrent_spl_level:
.word _C_LABEL(current_spl_level)
Lcurrent_intr_depth:
.word _C_LABEL(current_intr_depth)
Lspl_masks:
.word _C_LABEL(spl_masks)
.globl _C_LABEL(saipic_base)
_C_LABEL(saipic_base):
.word 0x00000000
#ifdef INTR_DEBUG
Ldbg_str:
.asciz "irq_entry %x %x\n"
#endif
AST_ALIGNMENT_FAULT_LOCALS
/*
* Register usage
*
* r6 - Address of current handler
* r7 - Pointer to handler pointer list
* r8 - Current IRQ requests.
* r9 - Used to count through possible IRQ bits.
* r10 - Base address of SAIP
*/
ASENTRY_NP(irq_entry)
sub lr, lr, #0x00000004 /* Adjust the lr */
PUSHFRAMEINSVC /* Push an interrupt frame */
ENABLE_ALIGNMENT_FAULTS
/* Load r8 with the SAIPIC interrupt requests */
ldr r10, _C_LABEL(saipic_base)
ldr r8, [r10, #(SAIPIC_IP)] /* Load IRQ pending register */
#ifdef INTR_DEBUG
ldr r2, [r10, #(SAIPIC_MR)]
adr r0, Ldbg_str
mov r1, r8
bl _C_LABEL(printf)
#endif
/*
* Note that we have entered the IRQ handler.
* We are in SVC mode so we cannot use the processor mode
* to determine if we are in an IRQ. Instead we will count the
* each time the interrupt handler is nested.
*/
ldr r0, Lcurrent_intr_depth
ldr r1, [r0]
add r1, r1, #1
str r1, [r0]
/*
* Need to block all interrupts at the IPL or lower for
* all asserted interrupts.
* This basically emulates hardware interrupt priority levels.
* Means we need to go through the interrupt mask and for
* every asserted interrupt we need to mask out all other
* interrupts at the same or lower IPL.
* If only we could wait until the main loop but we need to sort
* this out first so interrupts can be re-enabled.
*
* This would benefit from a special ffs type routine
*/
mov r9, #(_SPL_LEVELS - 1)
ldr r7, Lspl_masks
Lfind_highest_ipl:
ldr r2, [r7, r9, lsl #2]
tst r8, r2
subeq r9, r9, #1
beq Lfind_highest_ipl
/* r9 = SPL level of highest priority interrupt */
add r9, r9, #1
ldr r2, [r7, r9, lsl #2]
mvn r2, r2
ldr r0, Lcurrent_spl_level
ldr r1, [r0]
str r9, [r0]
stmfd sp!, {r1}
/* Update the SAIP irq masks */
bl _C_LABEL(irq_setmasks)
#ifdef INTR_DEBUG
stmfd sp!, {r0,r1,r2}
adr r0, Ldbg_str
mov r1, #1
mov r2, r9
bl _C_LABEL(printf)
ldmia sp!, {r0,r1,r2}
#endif
mrs r0, cpsr_all /* Enable IRQs */
bic r0, r0, #I32_bit
msr cpsr_all, r0
ldr r7, Lirqhandlers
mov r9, #0x00000001
irqloop:
/* This would benefit from a special ffs type routine */
tst r8, r9 /* Is a bit set ? */
beq nextirq /* No ? try next bit */
ldr r6, [r7] /* Get address of first handler structure */
teq r6, #0x00000000 /* Do we have a handler */
moveq r0, r8 /* IRQ requests as arg 0 */
beq _C_LABEL(stray_irqhandler) /* call special handler */
ldr r0, Lcnt /* Stat info */
ldr r1, [r0, #(V_INTR)]
add r1, r1, #0x00000001
str r1, [r0, #(V_INTR)]
/*
* XXX: Should stats be accumulated for every interrupt routine
* called or for every physical interrupt that is serviced.
*/
#ifdef IRQSTATS
ldr r0, Lintrcnt
ldr r1, [r6, #(IH_COUNT)]
add r0, r0, r1, lsl #2
ldr r1, [r0]
add r1, r1, #0x00000001
str r1, [r0]
#endif /* IRQSTATS */
irqchainloop:
#ifdef INTR_DEBUG
stmfd sp!, {r0,r1,r2}
adr r0, Ldbg_str
mov r1, #2
bl _C_LABEL(printf)
ldmia sp!, {r0,r1,r2}
#endif
ldr r0, [r6, #(IH_ARG)] /* Get argument pointer */
teq r0, #0x00000000 /* If arg is zero pass stack frame */
addeq r0, sp, #4 /* ... stack frame [XXX needs care] */
mov lr, pc /* return address */
ldr pc, [r6, #(IH_FUNC)] /* Call handler */
teq r0, #0x00000001 /* Was the irq serviced ? */
beq irqdone
ldr r6, [r6, #(IH_NEXT)]
teq r6, #0x00000000
bne irqchainloop
irqdone:
nextirq:
add r7, r7, #0x00000004 /* update pointer to handlers */
mov r9, r9, lsl #1 /* move on to next bit */
teq r9, #(1 << 31) /* done the last bit ? */
bne irqloop /* no - loop back. */
ldmfd sp!, {r2}
ldr r1, Lcurrent_spl_level
str r2, [r1]
/* Restore previous disabled mask */
bl _C_LABEL(irq_setmasks)
bl _C_LABEL(dosoftints) /* Handle the soft interrupts */
/* Kill IRQ's in preparation for exit */
mrs r0, cpsr_all
orr r0, r0, #(I32_bit)
msr cpsr_all, r0
#ifdef INTR_DEBUG
adr r0, Ldbg_str
mov r1, #3
ldr r2, [r10, #(SAIPIC_MR)]
bl _C_LABEL(printf)
#endif
/* Decrement the nest count */
ldr r0, Lcurrent_intr_depth
ldr r1, [r0]
sub r1, r1, #1
str r1, [r0]
DO_AST_AND_RESTORE_ALIGNMENT_FAULTS
PULLFRAMEFROMSVCANDEXIT
/* NOT REACHED */
b . - 8
ENTRY(irq_setmasks)
/* Disable interrupts */
mrs r3, cpsr_all
orr r1, r3, #(I32_bit)
msr cpsr_all, r1
/* Calculate interrupt mask */
ldr r0, Lspl_masks
ldr r2, Lcurrent_spl_level
ldr r2, [r2]
ldr r2, [r0, r2, lsl #2]
ldr r0, _C_LABEL(saipic_base)
str r2, [r0, #(SAIPIC_MR)] /* Set mask register */
/* Restore old cpsr and exit */
msr cpsr_all, r3
mov pc, lr
Lcnt:
.word _C_LABEL(uvmexp)
#ifdef IRQSTATS
Lintrcnt:
.word _C_LABEL(intrcnt)
#endif
Lirqhandlers:
.word _C_LABEL(irqhandlers) /* Pointer to array of irqhandlers */
#ifdef IRQSTATS
.global _C_LABEL(intrnames), _C_LABEL(eintrnames)
.global _C_LABEL(eintrcnt)
_C_LABEL(intrnames):
_C_LABEL(eintrnames):
_C_LABEL(eintrcnt):
.globl _C_LABEL(intrcnt), _C_LABEL(sintrcnt)
_C_LABEL(intrcnt):
.space ICU_LEN*4 /* XXX Should be linked to number of interrupts */
_C_LABEL(sintrcnt):
.space 32*4
#endif
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