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NetBSD/sys/arch/arm32/iomd/iomd_irq.S

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ArmAsm
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/* $NetBSD: iomd_irq.S,v 1.5 1996/05/06 00:25:43 mark Exp $ */
/*
* Copyright (c) 1994-1996 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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 Brini.
* 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 BRINI ``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 BRINI 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.
*
* RiscBSD kernel project
*
* irq.S
*
* Low level irq and fiq handlers
*
* Created : 27/09/94
*/
#include "assym.h"
#include <machine/cpu.h>
#include <machine/iomd.h>
#define PUSHFRAME \
str lr, [sp, #-4]!; /* Push the return address */ \
sub sp, sp, #0x00000004; /* Skip SVC R14 */ \
stmdb sp, {r0-r14}^; /* Push the user mode registers */ \
sub sp, sp, #(4*15); /* Adjust the stack pointer */ \
mrs r0, spsr_all; /* Put the SPSR on the stack */ \
str r0, [sp, #-4]!;
#define PULLFRAME \
ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \
msr spsr_all, r0; \
add sp, sp, #(4*15); /* Adjust the stack pointer */ \
ldmdb sp, {r0-r14}^; /* Restore the registers (user mode) */ \
mov r0, r0; /* NOP for previous instruction */ \
add sp, sp, #0x00000004; /* Skip SVC R14 */ \
ldr lr, [sp], #0x0004; /* Pull the return address */
#define PULLFRAMEANDEXIT \
ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \
msr spsr_all, r0; \
add sp, sp, #(4*15); /* Adjust the stack pointer */ \
ldmdb sp, {r0-r14}^; /* Restore the registers (user mode) */ \
mov r0, r0; /* NOP for previous instruction */ \
add sp, sp, #0x00000004; /* Skip SVC R14 */ \
ldmia sp!, {pc}^ /* Pull the return address */
sp .req r13
lr .req r14
pc .req r15
.text
/*
*
* irq_entry
*
* Main entry point for the IRQ vector
*
* This function reads the irq request bits in the IOMD registers
* IRQRQA, IRQRQB and DMARQ
* It then calls an installed handler for each bit that is set.
* The function stray_irqhandler is called if a handler is not defined
* for a particular interrupt.
* If a interrupt handler is found then it is called with r0 containing
* the argument defined in the handler structure. If the field ih_arg
* is zero then a pointer to the IRQ frame on the stack is passed instead.
*/
Ldisabled_mask:
.word _disabled_mask
Lcurrent_spl_level:
.word _current_spl_level
.global irq_entry
/*
* Regsister 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 IOMD
*/
irq_entry:
sub lr, lr, #0x00000004 /* Adjust the lr */
PUSHFRAME
/* Raise the spl level and re-enable interrupts */
#if 0
ldr r1, Lcurrent_spl_level
ldr r0, [r1]
add r0, r0, #1
bl _raisespl
#endif
#if 0
mrs r0, cpsr_all /* Enable IRQ's */
bic r0, r0, #I32_bit
msr cpsr_all, r0
#endif
/*
* If we did not raise the spl level high enough we will get another
* interrupt here.
*/
mov r11, #0x00000000
mov r10, #(IOMD_BASE) /* Point to the IOMD */
ldrb r8, [r10, #(IOMD_IRQRQA - IOMD_BASE)] /* Get IRQ request A */
/* strb r8, [r10, #(IOMD_IRQRQA - IOMD_BASE)]*/
ldrb r9, [r10, #(IOMD_IRQRQB - IOMD_BASE)] /* Get IRQ request B */
orr r8, r8, r9, lsl #8
ldrb r9, [r10, #(IOMD_DMARQ - IOMD_BASE)] /* Get DMA Request */
orr r8, r8, r9, lsl #16
/*#if 0*/
mov r0, #0x7d /* Clear IOMD IRQ bits */
strb r0, [r10, #(IOMD_IRQRQA - IOMD_BASE)]
/*#endif*/
/* ldr r1, Ldisabled_mask
ldr r0, [r1]
orr r0, r0, r8
str r0, [r1]
bl _irq_setmasks*/
#if 0
mrs r0, cpsr_all /* Enable IRQ's */
bic r0, r0, #I32_bit
msr cpsr_all, r0
#endif
mov r0, sp
mov r1, r8
bl _validate_irq_address
ldr r7, [pc, #irqhandlers - . - 8]
mov r9, #0x00000001
stmfd sp!, {r8}
irqloop:
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 _stray_irqhandler /* call special handler */
ldr r0, Lcnt
ldr r1, [r0, #(V_INTR)]
add r1, r1, #0x00000001
str r1, [r0, #(V_INTR)]
irqchainloop:
add lr, pc, #nextinchain - . - 8 /* return address */
#ifdef IRQSTATS
ldr r0, Lintrcnt
ldr r1, [r6, #(IH_NUM)]
add r0, r0, r1, lsl #2
ldr r1, [r0]
add r1, r1, #0x00000001
str r1, [r0]
#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 */
ldr pc, [r6, #(IH_FUNC)] /* Call handler */
nextinchain:
/* ldr r1, Ldisabled_mask
ldr r2, [r1]
bic r2, r2, r9
str r2, [r1]
bl _irq_setmasks*/
teq r0, #0x00000001 /* Was the irq serviced ? */
beq nextirq
ldr r6, [r6, #(IH_NEXT)]
teq r6, #0x00000000
/* bne irqchainloop*/
nextirq:
add r7, r7, #0x00000004 /* update pointer to handlers */
mov r9, r9, lsl #1 /* move on to next bit */
teq r9, #(1 << 24) /* done the last bit ? */
bne irqloop /* no - loop back. */
ldmfd sp!, {r8}
#if 0
mrs r0, cpsr_all /* Enable IRQ's */
orr r0, r0, #I32_bit
msr cpsr_all, r0
#endif
bl _dosoftints /* Handle the soft interrupts */
/* Disable interrupts and lower the spl level */
#if 0
mrs r0, cpsr_all /* Enable IRQ's */
orr r0, r0, #I32_bit
msr cpsr_all, r0
#endif
#if 0
ldr r1, Lcurrent_spl_level
ldr r0, [r1]
sub r0, r0, #1
bl _lowerspl
#endif
ldr r0, [sp] /* Get the SPSR from stack */
and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the IRQ */
teq r0, #(PSR_USR32_MODE)
ldreq r0, Lastpending /* Do we have an AST pending ? */
ldreq r1, [r0]
teqeq r1, #0x00000001
moveq r1, #0x00000000 /* Clear it */
streq r1, [r0]
moveq r0, sp /* arg 0 = irq frame */
beq _irqast /* exit via the AST handler */
PULLFRAME
movs pc, lr /* Exit */
.global _irqast
_irqast:
/* Punch into SVC32 mode (R0 points to the irqframe) */
/* We can trash all the registers we like :-) */
/* Debug message */
/* stmfd sp!, {r0-r3}
add r0, pc, #Lirqtext0 - . - 8
bl _printf
ldmfd sp!, {r0-r3}*/
mrs r2, cpsr_all
tst r2, #(I32_bit)
bne Lis
orr r2, r2, #(I32_bit)
msr cpsr_all, r2
stmfd sp!, {r0-r3, lr}
add r0, pc, #Lirqtext0 - . - 8
bl _printf
ldmfd sp!, {r0-r3, lr}
Lis:
add sp, sp, #72 /* Correct IRQ32 sp */
/*
* We have now put IRQ mode back correct so we never need to return to
* IRQ mode we can just exit via SVC mode. We must copy the trap frame
* which still lies on the IRQ stack over to the SVC stack.
*/
/* Punch into SVC 32 mode (IRQ's still disabled) */
mrs r2, cpsr_all
bic r2, r2, #(PSR_MODE)
eor r2, r2, #(PSR_SVC32_MODE)
orr r2, r2, #(I32_bit) /* Overkill */
msr cpsr_all, r2
sub sp, sp, #72 /* Correct SVC32 sp */
mov r12, sp
/* r0 points to the trap frame on the IRQ stack (SP corrected) */
/* r12 points to the trap frame on the SVC stack */
ldmia r0!, {r1-r9} /* Pull 9 regs off the IRQ stack */
stmia r12!, {r1-r9} /* Store on the SVC stack */
ldmia r0!, {r1-r9} /* Pull 9 regs off the IRQ stack */
stmia r12!, {r1-r9} /* Store on the SVC stack */
/* Ok the IRQ trapframe is now the SVC trapframe */
/* IRQ's could be enabled here */
/* Debug message */
/* stmfd sp!, {r0-r3}
add r0, pc, #Lirqtext1 - . - 8
bl _printf
ldmfd sp!, {r0-r3}
*/
/* r0 points to trap frame on entry to ast() */
mov r0, sp
stmfd sp!, {lr} /* Is this needed ? */
bl _ast
ldmfd sp!, {lr} /* Is this needed ? */
/* Remember the address of the trap frame */
/* stmfd sp!, {r0-r3}
add r0, pc, #Lirqtext2 - . - 8
bl _printf
ldmfd sp!, {r0-r3}
*/
/* Pull the frame from the SVC stack and return */
/* mov lr, #0*/
/* Kill IRQ's incase ast as somehow re-enabled them ... */
mrs r0, cpsr_all
orr r0, r0, #(I32_bit)
msr cpsr_all, r0
PULLFRAMEANDEXIT
mov r4, #0x000000A0
mov pc, #0x00000000
Lirqtext0:
.asciz "irqs enabled during ast\n"
.align 0
Lirqtext1:
.asciz "irqframe copied to SVC stack\n"
.align 0
Lirqtext2:
.asciz "irqframe restored from SVC stack\n"
.align 0
Lspl_mask:
.word _spl_mask
Lcurrent_mask:
.word _current_mask
.global _irq_setmasks
_irq_setmasks:
ldr r1, Lcurrent_mask
ldr r1, [r1]
ldr r2, Lspl_mask
ldr r2, [r2]
and r1, r1, r2
ldr r2, Ldisabled_mask
ldr r2, [r2]
bic r1, r1, r2
mov r0, #(IOMD_BASE) /* Point to the IOMD */
strb r1, [r0, #(IOMD_IRQMSKA - IOMD_BASE)] /* Set IRQ mask A */
mov r1, r1, lsr #8
strb r1, [r0, #(IOMD_IRQMSKB - IOMD_BASE)] /* Set IRQ mask B */
mov r1, r1, lsr #8
strb r1, [r0, #(IOMD_DMAMSK - IOMD_BASE)] /* Set DMA mask */
mov pc, r14
Lcnt:
.word _cnt
Lintrcnt:
.word _intrcnt
irqhandlers:
.word _irqhandlers /* Pointer to array of irqhandlers */
Lastpending:
.word _astpending
#ifdef IRQSTATS
/* These symbols are used by vmstat */
.text
.global __intrnames
__intrnames:
.word _intrnames
.data
.globl _intrnames, _eintrnames, _intrcnt, _eintrcnt
_intrnames:
.asciz "interrupt 0 "
.asciz "softnet " /* reserved0 */
.asciz "interrupt 2 "
.asciz "interrupt 3 "
.asciz "interrupt 4 "
.asciz "interrupt 5 "
.asciz "interrupt 6 "
.asciz "softclock " /* reserved1 */
.asciz "reserved 2 "
.asciz "interrupt 9 "
.asciz "interrupt 10 "
.asciz "interrupt 11 "
.asciz "interrupt 12 "
.asciz "interrupt 13 "
.asciz "interrupt 14 "
.asciz "interrupt 15 "
.asciz "dma channel 0"
.asciz "dma channel 1"
.asciz "dma channel 2"
.asciz "dma channel 3"
.asciz "interrupt 20 "
.asciz "interrupt 21 "
.asciz "reserved 3 "
.asciz "reserved 4 "
.asciz "exp card 0 "
.asciz "exp card 1 "
.asciz "exp card 2 "
.asciz "exp card 3 "
.asciz "exp card 4 "
.asciz "exp card 5 "
.asciz "exp card 6 "
.asciz "exp card 7 "
_eintrnames:
.bss
.align 0
_intrcnt:
.space 32*4
_eintrcnt:
#else
/* Dummy entries to keep vmstat happy */
.text
.globl _intrnames, _eintrnames, _intrcnt, _eintrcnt
_intrnames:
.long 0
_eintrnames:
_intrcnt:
.long 0
_eintrcnt:
#endif
/* FIQ code */
.text
.align 0
.global _fiq_setregs /* Sets up the FIQ handler */
_fiq_setregs:
mrs r2, cpsr_all
mov r3, r2
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_FIQ32_MODE)
msr cpsr_all, r2
ldr r8, [r0, #FH_R8] /* Update FIQ registers*/
ldr r9, [r0, #FH_R9]
ldr r10, [r0, #FH_R10]
ldr r11, [r0, #FH_R11]
ldr r12, [r0, #FH_R12]
ldr r13, [r0, #FH_R13]
msr cpsr_all, r3 /* Back to old mode */
mov pc, lr /* Exit */
.global _fiq_getregs /* Gets the FIQ registers */
_fiq_getregs:
mrs r2, cpsr_all
mov r3, r2
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_FIQ32_MODE)
msr cpsr_all, r2
str r8, [r0, #FH_R8] /* Update FIQ registers*/
str r9, [r0, #FH_R9]
str r10, [r0, #FH_R10]
str r11, [r0, #FH_R11]
str r12, [r0, #FH_R12]
str r13, [r0, #FH_R13]
msr cpsr_all, r3 /* Back to old mode */
mov pc, lr /* Exit */
/* End of irq.S */
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