| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | #include <asm/asm.h> |
| 2 | #include <asm/mipsregs.h> |
| 3 | #include <asm/regdef.h> |
| 4 | #include <asm/stackframe.h> |
| 5 | |
| 6 | .text |
| 7 | .set macro |
| 8 | .set noat |
| 9 | .align 5 |
| 10 | |
| 11 | NESTED(it8172_IRQ, PT_SIZE, sp) |
| 12 | SAVE_ALL |
| 13 | CLI # Important: mark KERNEL mode ! |
| 14 | |
| 15 | /* We're working with 'reorder' set at this point. */ |
| 16 | /* |
| 17 | * Get pending interrupts |
| 18 | */ |
| 19 | |
| 20 | mfc0 t0,CP0_CAUSE # get pending interrupts |
| 21 | mfc0 t1,CP0_STATUS # get enabled interrupts |
| 22 | and t0,t1 # isolate allowed ones |
| 23 | |
| 24 | andi t0,0xff00 # isolate pending bits |
| 25 | beqz t0, 3f # spurious interrupt |
| 26 | |
| 27 | andi a0, t0, CAUSEF_IP7 |
| 28 | beq a0, zero, 1f |
| 29 | |
| 30 | li a0, 127 # MIPS_CPU_TIMER_IRQ = (NR_IRQS-1) |
| 31 | move a1, sp |
| 32 | jal ll_timer_interrupt |
| 33 | j ret_from_irq |
| 34 | nop |
| 35 | |
| 36 | 1: |
| 37 | andi a0, t0, CAUSEF_IP2 # the only int we expect at this time |
| 38 | beq a0, zero, 3f |
| 39 | move a0,sp |
| 40 | jal it8172_hw0_irqdispatch |
| 41 | |
| 42 | mfc0 t0,CP0_STATUS # disable interrupts |
| 43 | ori t0,1 |
| 44 | xori t0,1 |
| 45 | mtc0 t0,CP0_STATUS |
| 46 | nop |
| 47 | nop |
| 48 | nop |
| 49 | |
| 50 | la a1, ret_from_irq |
| 51 | jr a1 |
| 52 | nop |
| 53 | |
| 54 | 3: |
| 55 | move a0, sp |
| 56 | jal mips_spurious_interrupt |
| 57 | nop |
| 58 | la a1, ret_from_irq |
| 59 | jr a1 |
| 60 | nop |
| 61 | |
| 62 | END(it8172_IRQ) |
| 63 | |