| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Carsten Langgaard, carstenl@mips.com |
| 3 | * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can distribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License (Version 2) as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 17 | * |
| 18 | * Interrupt exception dispatch code. |
| 19 | */ |
| 20 | #include <asm/asm.h> |
| 21 | #include <asm/mipsregs.h> |
| 22 | #include <asm/regdef.h> |
| 23 | #include <asm/stackframe.h> |
| 24 | |
| 25 | .text |
| 26 | .set noreorder |
| 27 | .align 5 |
| 28 | NESTED(lasatIRQ, PT_SIZE, sp) |
| 29 | .set noat |
| 30 | SAVE_ALL |
| 31 | CLI |
| 32 | .set at |
| 33 | .set noreorder |
| 34 | |
| 35 | mfc0 s0, CP0_CAUSE # get irq mask |
| 36 | |
| 37 | /* First we check for r4k counter/timer IRQ. */ |
| 38 | andi a0, s0, CAUSEF_IP7 |
| 39 | beq a0, zero, 1f |
| 40 | andi a0, s0, CAUSEF_IP2 # delay slot, check hw0 interrupt |
| 41 | |
| 42 | /* Wheee, a timer interrupt. */ |
| 43 | li a0, 7 |
| 44 | jal ll_timer_interrupt |
| 45 | move a1, sp |
| 46 | |
| 47 | j ret_from_irq |
| 48 | nop |
| 49 | |
| 50 | 1: |
| 51 | /* Wheee, combined hardware level zero interrupt. */ |
| 52 | jal lasat_hw0_irqdispatch |
| 53 | move a0, sp # delay slot |
| 54 | |
| 55 | j ret_from_irq |
| 56 | nop # delay slot |
| 57 | |
| 58 | 1: |
| 59 | /* |
| 60 | * Here by mistake? This is possible, what can happen is that by the |
| 61 | * time we take the exception the IRQ pin goes low, so just leave if |
| 62 | * this is the case. |
| 63 | */ |
| 64 | move a1,s0 |
| 65 | mfc0 a1, CP0_EPC |
| 66 | |
| 67 | j ret_from_irq |
| 68 | nop |
| 69 | END(lasatIRQ) |