diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2000-07-10 23:47:44 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2000-07-10 23:47:44 +0000 |
| commit | ce7a3f3db827012e90ceae068572d813643e3d32 (patch) | |
| tree | 0ae05de73cea41d13e2f5c537dad97ae7e34fc33 /arch/mips/orion/int-handler.S | |
| parent | c7c4310f7fc1485925d800628bf50b3aeab535ef (diff) | |
Support for the Galileo Orion board. From Cort.
Diffstat (limited to 'arch/mips/orion/int-handler.S')
| -rw-r--r-- | arch/mips/orion/int-handler.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/mips/orion/int-handler.S b/arch/mips/orion/int-handler.S new file mode 100644 index 000000000..e5023b961 --- /dev/null +++ b/arch/mips/orion/int-handler.S @@ -0,0 +1,53 @@ +#include <asm/asm.h> +#include <asm/mipsregs.h> +#include <asm/regdef.h> +#include <asm/stackframe.h> + + .text + .set mips1 + .set reorder + .set macro + .set noat + .align 5 + +NESTED(orionIRQ, PT_SIZE, sp) + SAVE_ALL + CLI # Important: mark KERNEL mode ! + /* + * 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 + sll t0,16 # shift the pending bits down + beqz t0,3f # no pending intrs, then spurious + nop # delay slot + + /* + * Find irq with highest priority + * FIXME: This is slow - use binary search + */ + la a0,7 +1: bltz t0,2f # found pending irq + subu a0,1 + sll t0,1 + b 1b + nop # delay slot + +call_do_IRQ: +2: move a1,sp + jal do_IRQ + nop # delay slot + + mfc0 t0,CP0_STATUS # disable interrupts + ori t0,1 + xori t0,1 + mtc0 t0,CP0_STATUS + + la a1, ret_from_irq + jr a1 + +3: j spurious_interrupt +END(orionIRQ) + |