Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
282
arch/mips/jazz/int-handler.S
Normal file
282
arch/mips/jazz/int-handler.S
Normal file
@@ -0,0 +1,282 @@
|
||||
/*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*
|
||||
* Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse
|
||||
*
|
||||
* Jazz family specific interrupt stuff
|
||||
*
|
||||
* To do: On Jazz machines we remap some non-ISA interrupts to ISA
|
||||
* interrupts. These interrupts should use their own vectors.
|
||||
* Squeeze the last cycles out of the handlers. Only a dead
|
||||
* cycle is a good cycle.
|
||||
*/
|
||||
#include <asm/asm.h>
|
||||
#include <asm/mipsregs.h>
|
||||
#include <asm/jazz.h>
|
||||
#include <asm/regdef.h>
|
||||
#include <asm/stackframe.h>
|
||||
|
||||
/*
|
||||
* jazz_handle_int: Interrupt handler for the ACER Pica-61 boards
|
||||
*/
|
||||
.set noreorder
|
||||
|
||||
NESTED(jazz_handle_int, PT_SIZE, ra)
|
||||
.set noat
|
||||
SAVE_ALL
|
||||
CLI
|
||||
.set at
|
||||
|
||||
/*
|
||||
* Get pending interrupts
|
||||
*/
|
||||
mfc0 t0,CP0_CAUSE # get pending interrupts
|
||||
mfc0 t1,CP0_STATUS # get enabled interrupts
|
||||
and t0,t1 # isolate allowed ones
|
||||
andi t0,0xff00 # isolate pending bits
|
||||
beqz t0,3f
|
||||
sll t0,16 # delay slot
|
||||
|
||||
/*
|
||||
* Find irq with highest priority
|
||||
* FIXME: This is slow - use binary search
|
||||
*/
|
||||
la t1,ll_vectors
|
||||
1: bltz t0,2f # found pending irq
|
||||
sll t0,1
|
||||
b 1b
|
||||
subu t1,PTRSIZE # delay slot
|
||||
|
||||
/*
|
||||
* Do the low-level stuff
|
||||
*/
|
||||
2: lw t0,(t1)
|
||||
jr t0
|
||||
nop # delay slot
|
||||
END(jazz_handle_int)
|
||||
|
||||
ll_sw0: li s1,~IE_SW0
|
||||
mfc0 t0,CP0_CAUSE
|
||||
and t0,s1
|
||||
mtc0 t0,CP0_CAUSE
|
||||
PANIC("Unimplemented sw0 handler")
|
||||
|
||||
ll_sw1: li s1,~IE_SW1
|
||||
mfc0 t0,CP0_CAUSE
|
||||
and t0,s1
|
||||
mtc0 t0,CP0_CAUSE
|
||||
PANIC("Unimplemented sw1 handler")
|
||||
|
||||
ll_local_dma: li s1,~IE_IRQ0
|
||||
PANIC("Unimplemented local_dma handler")
|
||||
|
||||
ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE
|
||||
#if PTRSIZE == 8 /* True 64 bit kernel */
|
||||
dsll t0,1
|
||||
#endif
|
||||
.set reorder
|
||||
LONG_L t0,local_vector(t0)
|
||||
jr t0
|
||||
.set noreorder
|
||||
|
||||
/*
|
||||
* The braindead PICA hardware gives us no way to distinguish if we really
|
||||
* received interrupt 7 from the (E)ISA bus or if we just received an
|
||||
* interrupt with no findable cause. This sometimes happens with braindead
|
||||
* cards. Oh well - for all the Jazz boxes slots are more or less just
|
||||
* whistles and bells and we're aware of the problem.
|
||||
*/
|
||||
ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK
|
||||
|
||||
jal do_IRQ
|
||||
move a1,sp
|
||||
|
||||
j ret_from_irq
|
||||
nop
|
||||
|
||||
/*
|
||||
* Hmm... This is not just a plain PC clone so the question is
|
||||
* which devices on Jazz machines can generate an (E)ISA NMI?
|
||||
* (Writing to nonexistent memory?)
|
||||
*/
|
||||
ll_isa_nmi: li s1,~IE_IRQ3
|
||||
PANIC("Unimplemented isa_nmi handler")
|
||||
|
||||
/*
|
||||
* Timer IRQ - remapped to be more similar to an IBM compatible.
|
||||
*
|
||||
* The timer interrupt is handled specially to ensure that the jiffies
|
||||
* variable is updated at all times. Specifically, the timer interrupt is
|
||||
* just like the complete handlers except that it is invoked with interrupts
|
||||
* disabled and should never re-enable them. If other interrupts were
|
||||
* allowed to be processed while the timer interrupt is active, then the
|
||||
* other interrupts would have to avoid using the jiffies variable for delay
|
||||
* and interval timing operations to avoid hanging the system.
|
||||
*/
|
||||
ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read
|
||||
li s1,~IE_IRQ4
|
||||
|
||||
li a0, JAZZ_TIMER_IRQ
|
||||
jal do_IRQ
|
||||
move a1,sp
|
||||
|
||||
mfc0 t0,CP0_STATUS # disable interrupts again
|
||||
ori t0,1
|
||||
xori t0,1
|
||||
mtc0 t0,CP0_STATUS
|
||||
|
||||
j ret_from_irq
|
||||
nop
|
||||
|
||||
/*
|
||||
* CPU count/compare IRQ (unused)
|
||||
*/
|
||||
ll_count: j ret_from_irq
|
||||
mtc0 zero,CP0_COMPARE
|
||||
|
||||
#if 0
|
||||
/*
|
||||
* Call the handler for the interrupt
|
||||
* (Currently unused)
|
||||
*/
|
||||
call_real: /*
|
||||
* temporarily disable interrupt
|
||||
*/
|
||||
mfc0 t2,CP0_STATUS
|
||||
and t2,s1
|
||||
mtc0 t2,CP0_STATUS
|
||||
nor s1,zero,s1
|
||||
jal do_IRQ
|
||||
|
||||
/*
|
||||
* reenable interrupt
|
||||
*/
|
||||
mfc0 t2,CP0_STATUS
|
||||
or t2,s1
|
||||
mtc0 t2,CP0_STATUS
|
||||
j ret_from_irq
|
||||
#endif
|
||||
|
||||
.data
|
||||
PTR ll_sw0 # SW0
|
||||
PTR ll_sw1 # SW1
|
||||
PTR ll_local_dma # Local DMA
|
||||
PTR ll_local_dev # Local devices
|
||||
PTR ll_isa_irq # ISA IRQ
|
||||
PTR ll_isa_nmi # ISA NMI
|
||||
PTR ll_timer # Timer
|
||||
ll_vectors: PTR ll_count # Count/Compare IRQ
|
||||
|
||||
/*
|
||||
* Interrupt handlers for local devices.
|
||||
*/
|
||||
.text
|
||||
.set reorder
|
||||
loc_no_irq: PANIC("Unimplemented loc_no_irq handler")
|
||||
/*
|
||||
* Parallel port IRQ
|
||||
*/
|
||||
loc_parallel: li s1,~JAZZ_IE_PARALLEL
|
||||
li a0,JAZZ_PARALLEL_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Floppy IRQ
|
||||
*/
|
||||
loc_floppy: li s1,~JAZZ_IE_FLOPPY
|
||||
li a0,JAZZ_FLOPPY_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Sound IRQ
|
||||
*/
|
||||
loc_sound: PANIC("Unimplemented loc_sound handler")
|
||||
loc_video: PANIC("Unimplemented loc_video handler")
|
||||
|
||||
/*
|
||||
* Ethernet interrupt handler
|
||||
*/
|
||||
loc_ethernet: li s1,~JAZZ_IE_ETHERNET
|
||||
li a0,JAZZ_ETHERNET_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* SCSI interrupt handler
|
||||
*/
|
||||
loc_scsi: li s1,~JAZZ_IE_SCSI
|
||||
li a0,JAZZ_SCSI_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Keyboard interrupt handler
|
||||
*/
|
||||
loc_keyboard: li s1,~JAZZ_IE_KEYBOARD
|
||||
li a0,JAZZ_KEYBOARD_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Mouse interrupt handler
|
||||
*/
|
||||
loc_mouse: li s1,~JAZZ_IE_MOUSE
|
||||
li a0,JAZZ_MOUSE_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Serial port 1 IRQ
|
||||
*/
|
||||
loc_serial1: li s1,~JAZZ_IE_SERIAL1
|
||||
li a0,JAZZ_SERIAL1_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Serial port 2 IRQ
|
||||
*/
|
||||
loc_serial2: li s1,~JAZZ_IE_SERIAL2
|
||||
li a0,JAZZ_SERIAL2_IRQ
|
||||
b loc_call
|
||||
|
||||
/*
|
||||
* Call the interrupt handler for an interrupt generated by a
|
||||
* local device.
|
||||
*/
|
||||
loc_call: /*
|
||||
* Temporarily disable interrupt source
|
||||
*/
|
||||
lhu t2,JAZZ_IO_IRQ_ENABLE
|
||||
and t2,s1
|
||||
sh t2,JAZZ_IO_IRQ_ENABLE
|
||||
|
||||
nor s1,zero,s1
|
||||
jal do_IRQ
|
||||
|
||||
/*
|
||||
* Reenable interrupt
|
||||
*/
|
||||
lhu t2,JAZZ_IO_IRQ_ENABLE
|
||||
or t2,s1
|
||||
sh t2,JAZZ_IO_IRQ_ENABLE
|
||||
|
||||
j ret_from_irq
|
||||
|
||||
/*
|
||||
* "Jump extender" to reach spurious_interrupt
|
||||
*/
|
||||
3: j spurious_interrupt
|
||||
|
||||
/*
|
||||
* Vectors for interrupts generated by local devices
|
||||
*/
|
||||
.data
|
||||
local_vector: PTR loc_no_irq
|
||||
PTR loc_parallel
|
||||
PTR loc_floppy
|
||||
PTR loc_sound
|
||||
PTR loc_video
|
||||
PTR loc_ethernet
|
||||
PTR loc_scsi
|
||||
PTR loc_keyboard
|
||||
PTR loc_mouse
|
||||
PTR loc_serial1
|
||||
PTR loc_serial2
|
||||
Reference in New Issue
Block a user