/* * linux/drivers/sound/vidc_fill.S * * Copyright (C) 1997 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Filler routines for DMA buffers */ #include #include #include #include .text ENTRY(vidc_fill_1x8_u) mov ip, #0xff00 1: cmp r0, r1 bge vidc_clear ldrb r4, [r0], #1 eor r4, r4, #0x80 and r4, ip, r4, lsl #8 orr r4, r4, r4, lsl #16 str r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_2x8_u) mov ip, #0xff00 1: cmp r0, r1 bge vidc_clear ldr r4, [r0], #2 and r5, r4, ip and r4, ip, r4, lsl #8 orr r4, r4, r5, lsl #16 orr r4, r4, r4, lsr #8 str r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_1x8_s) mov ip, #0xff00 1: cmp r0, r1 bge vidc_clear ldrb r4, [r0], #1 and r4, ip, r4, lsl #8 orr r4, r4, r4, lsl #16 str r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_2x8_s) mov ip, #0xff00 1: cmp r0, r1 bge vidc_clear ldr r4, [r0], #2 and r5, r4, ip and r4, ip, r4, lsl #8 orr r4, r4, r5, lsl #16 orr r4, r4, r4, lsr #8 str r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_1x16_s) mov ip, #0xff00 orr ip, ip, ip, lsr #8 1: cmp r0, r1 bge vidc_clear ldr r5, [r0], #2 and r4, r5, ip orr r4, r4, r4, lsl #16 str r4, [r2], #4 cmp r0, r1 addlt r0, r0, #2 andlt r4, r5, ip, lsl #16 orrlt r4, r4, r4, lsr #16 strlt r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_2x16_s) mov ip, #0xff00 orr ip, ip, ip, lsr #8 1: cmp r0, r1 bge vidc_clear ldr r4, [r0], #4 str r4, [r2], #4 cmp r0, r1 ldrlt r4, [r0], #4 strlt r4, [r2], #4 cmp r2, r3 blt 1b mov pc, lr ENTRY(vidc_fill_noaudio) mov r0, #0 mov r1, #0 2: mov r4, #0 mov r5, #0 1: cmp r2, r3 stmltia r2!, {r0, r1, r4, r5} blt 1b mov pc, lr ENTRY(vidc_clear) mov r0, #0 mov r1, #0 tst r2, #4 str r0, [r2], #4 tst r2, #8 stmia r2!, {r0, r1} b 2b /* * Call filler routines with: * r0 = phys address * r1 = phys end * r2 = buffer * Returns: * r0 = new buffer address * r2 = new buffer finish * r4 = corrupted * r5 = corrupted * ip = corrupted */ ENTRY(vidc_sound_dma_irq) stmfd sp!, {r4 - r8, lr} ldr r8, =dma_start ldmia r8, {r0, r1, r2, r3, r4, r5} teq r1, #0 adreq r4, vidc_fill_noaudio moveq r7, #1 << 31 movne r7, #0 mov ip, #IOMD_BASE & 0xff000000 orr ip, ip, #IOMD_BASE & 0x00ff0000 ldrb r6, [ip, #IOMD_SD0ST] tst r6, #DMA_ST_OFL @ Check for overrun eorne r6, r6, #DMA_ST_AB tst r6, #DMA_ST_AB moveq r2, r3 @ DMAing A, update B add r3, r2, r5 @ End of DMA buffer add r1, r1, r0 @ End of virtual DMA buffer mov lr, pc mov pc, r4 @ Call fill routine (uses r4, ip) sub r1, r1, r0 @ Remaining length stmia r8, {r0, r1} mov r0, #0 tst r2, #4 @ Round buffer up to 4 words strne r0, [r2], #4 tst r2, #8 strne r0, [r2], #4 strne r0, [r2], #4 sub r2, r2, #16 mov r2, r2, lsl #20 movs r2, r2, lsr #20 orreq r2, r2, #1 << 30 @ Set L bit orr r2, r2, r7 ldmdb r8, {r3, r4, r5} tst r6, #DMA_ST_AB mov ip, #IOMD_BASE & 0xff000000 orr ip, ip, #IOMD_BASE & 0x00ff0000 streq r4, [ip, #IOMD_SD0CURB] strne r5, [ip, #IOMD_SD0CURA] streq r2, [ip, #IOMD_SD0ENDB] strne r2, [ip, #IOMD_SD0ENDA] ldr lr, [ip, #IOMD_SD0ST] tst lr, #DMA_ST_OFL bne 1f tst r6, #DMA_ST_AB strne r4, [ip, #IOMD_SD0CURB] streq r5, [ip, #IOMD_SD0CURA] strne r2, [ip, #IOMD_SD0ENDB] streq r2, [ip, #IOMD_SD0ENDA] 1: teq r7, #0 mov r0, #0x10 strneb r0, [ip, #IOMD_SD0CR] ldmfd sp!, {r4 - r8, lr} mov r0, #1 @ IRQ_HANDLED teq r1, #0 @ If we have no more movne pc, lr teq r3, #0 movne pc, r3 @ Call interrupt routine mov pc, lr .data .globl dma_interrupt dma_interrupt: .long 0 @ r3 .globl dma_pbuf dma_pbuf: .long 0 @ r4 .long 0 @ r5 .globl dma_start dma_start: .long 0 @ r0 .globl dma_count dma_count: .long 0 @ r1 .globl dma_buf dma_buf: .long 0 @ r2 .long 0 @ r3 .globl vidc_filler vidc_filler: .long vidc_fill_noaudio @ r4 .globl dma_bufsize dma_bufsize: .long 0x1000 @ r5 lass='ctrl'>
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /sound/pci/ca0106
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/pci/ca0106')