summaryrefslogtreecommitdiffstats
path: root/arch/mips/sgi-ip22/ip22-irq.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-irq.S')
-rw-r--r--arch/mips/sgi-ip22/ip22-irq.S118
1 files changed, 0 insertions, 118 deletions
diff --git a/arch/mips/sgi-ip22/ip22-irq.S b/arch/mips/sgi-ip22/ip22-irq.S
deleted file mode 100644
index 6ccbd9e1d967..000000000000
--- a/arch/mips/sgi-ip22/ip22-irq.S
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * ip22-irq.S: Interrupt exception dispatch code for FullHouse and
- * Guiness.
- *
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- */
-
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-/* A lot of complication here is taken away because:
- *
- * 1) We handle one interrupt and return, sitting in a loop and moving across
- * all the pending IRQ bits in the cause register is _NOT_ the answer, the
- * common case is one pending IRQ so optimize in that direction.
- *
- * 2) We need not check against bits in the status register IRQ mask, that
- * would make this routine slow as hell.
- *
- * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in
- * between like BSD spl() brain-damage.
- *
- * Furthermore, the IRQs on the INDY look basically (barring software IRQs
- * which we don't use at all) like:
- *
- * MIPS IRQ Source
- * -------- ------
- * 0 Software (ignored)
- * 1 Software (ignored)
- * 2 Local IRQ level zero
- * 3 Local IRQ level one
- * 4 8254 Timer zero
- * 5 8254 Timer one
- * 6 Bus Error
- * 7 R4k timer (what we use)
- *
- * We handle the IRQ according to _our_ priority which is:
- *
- * Highest ---- R4k Timer
- * Local IRQ zero
- * Local IRQ one
- * Bus Error
- * 8254 Timer zero
- * Lowest ---- 8254 Timer one
- *
- * then we just return, if multiple IRQs are pending then we will just take
- * another exception, big deal.
- */
-
- .text
- .set noreorder
- .set noat
- .align 5
- NESTED(indyIRQ, PT_SIZE, sp)
- SAVE_ALL
- CLI
- .set at
- mfc0 s0, CP0_CAUSE # get irq mask
-
- /* First we check for r4k counter/timer IRQ. */
- andi a0, s0, CAUSEF_IP7
- beq a0, zero, 1f
- andi a0, s0, CAUSEF_IP2 # delay slot, check local level zero
-
- /* Wheee, a timer interrupt. */
- jal indy_r4k_timer_interrupt
- move a0, sp # delay slot
- j ret_from_irq
- nop # delay slot
-
-1:
- beq a0, zero, 1f
- andi a0, s0, CAUSEF_IP3 # delay slot, check local level one
-
- /* Wheee, local level zero interrupt. */
- jal indy_local0_irqdispatch
- move a0, sp # delay slot
-
- j ret_from_irq
- nop # delay slot
-
-1:
- beq a0, zero, 1f
- andi a0, s0, CAUSEF_IP6 # delay slot, check bus error
-
- /* Wheee, local level one interrupt. */
- jal indy_local1_irqdispatch
- move a0, sp # delay slot
- j ret_from_irq
- nop # delay slot
-
-1:
- beq a0, zero, 1f
- andi a0, s0, (CAUSEF_IP4 | CAUSEF_IP5) # delay slot
-
- /* Wheee, an asynchronous bus error... */
- jal indy_buserror_irq
- move a0, sp # delay slot
- j ret_from_irq
- nop # delay slot
-
-1:
- /* Here by mistake? It is possible, that by the time we take
- * the exception the IRQ pin goes low, so just leave if this
- * is the case.
- */
- beq a0, zero, 1f
- nop # delay slot
-
- /* Must be one of the 8254 timers... */
- jal indy_8254timer_irq
- move a0, sp # delay slot
-1:
- j ret_from_irq
- nop # delay slot
- END(indyIRQ)