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Diffstat (limited to 'arch/mips/jazz/int-handler.S')
| -rw-r--r-- | arch/mips/jazz/int-handler.S | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/arch/mips/jazz/int-handler.S b/arch/mips/jazz/int-handler.S deleted file mode 100644 index e35f5fcd..0000000 --- a/arch/mips/jazz/int-handler.S +++ /dev/null @@ -1,283 +0,0 @@ -/* - * 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: jal spurious_interrupt - j ret_from_irq - -/* - * 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 |
