diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/lasat/lasatIRQ.S |
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!
Diffstat (limited to 'arch/mips/lasat/lasatIRQ.S')
-rw-r--r-- | arch/mips/lasat/lasatIRQ.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/mips/lasat/lasatIRQ.S b/arch/mips/lasat/lasatIRQ.S new file mode 100644 index 00000000000..2a2b0d05656 --- /dev/null +++ b/arch/mips/lasat/lasatIRQ.S @@ -0,0 +1,69 @@ +/* + * Carsten Langgaard, carstenl@mips.com + * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved. + * + * This program is free software; you can distribute it and/or modify it + * under the terms of the GNU General Public License (Version 2) as + * published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Interrupt exception dispatch code. + */ +#include <asm/asm.h> +#include <asm/mipsregs.h> +#include <asm/regdef.h> +#include <asm/stackframe.h> + + .text + .set noreorder + .align 5 + NESTED(lasatIRQ, PT_SIZE, sp) + .set noat + SAVE_ALL + CLI + .set at + .set noreorder + + 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 hw0 interrupt + + /* Wheee, a timer interrupt. */ + li a0, 7 + jal ll_timer_interrupt + move a1, sp + + j ret_from_irq + nop + +1: + /* Wheee, combined hardware level zero interrupt. */ + jal lasat_hw0_irqdispatch + move a0, sp # delay slot + + j ret_from_irq + nop # delay slot + +1: + /* + * Here by mistake? This is possible, what can happen is that by the + * time we take the exception the IRQ pin goes low, so just leave if + * this is the case. + */ + move a1,s0 + mfc0 a1, CP0_EPC + + j ret_from_irq + nop + END(lasatIRQ) |