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90 lines
2.0 KiB
90 lines
2.0 KiB
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2007-2017 Cavium, Inc.
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*/
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#include <asm/asm.h>
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#include <asm/regdef.h>
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#define CVMSEG_BASE -32768
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#define CVMSEG_SIZE 6912
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#define SAVE_REG(r) sd $r, CVMSEG_BASE + CVMSEG_SIZE - ((32 - r) * 8)($0)
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NESTED(octeon_wdt_nmi_stage2, 0, sp)
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.set push
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.set noreorder
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.set noat
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/* Clear Dcache so cvmseg works right. */
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cache 1,0($0)
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/* Use K0 to do a read/modify/write of CVMMEMCTL */
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dmfc0 k0, $11, 7
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/* Clear out the size of CVMSEG */
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dins k0, $0, 0, 6
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/* Set CVMSEG to its largest value */
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ori k0, k0, 0x1c0 | 54
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/* Store the CVMMEMCTL value */
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dmtc0 k0, $11, 7
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/*
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* Restore K0 from the debug scratch register, it was saved in
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* the boot-vector code.
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*/
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dmfc0 k0, $31
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/*
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* Save all registers to the top CVMSEG. This shouldn't
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* corrupt any state used by the kernel. Also all registers
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* should have the value right before the NMI.
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*/
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SAVE_REG(0)
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SAVE_REG(1)
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SAVE_REG(2)
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SAVE_REG(3)
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SAVE_REG(4)
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SAVE_REG(5)
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SAVE_REG(6)
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SAVE_REG(7)
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SAVE_REG(8)
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SAVE_REG(9)
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SAVE_REG(10)
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SAVE_REG(11)
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SAVE_REG(12)
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SAVE_REG(13)
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SAVE_REG(14)
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SAVE_REG(15)
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SAVE_REG(16)
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SAVE_REG(17)
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SAVE_REG(18)
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SAVE_REG(19)
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SAVE_REG(20)
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SAVE_REG(21)
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SAVE_REG(22)
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SAVE_REG(23)
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SAVE_REG(24)
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SAVE_REG(25)
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SAVE_REG(26)
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SAVE_REG(27)
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SAVE_REG(28)
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SAVE_REG(29)
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SAVE_REG(30)
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SAVE_REG(31)
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/* Write zero to all CVMSEG locations per Core-15169 */
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dli a0, CVMSEG_SIZE - (33 * 8)
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1: sd zero, CVMSEG_BASE(a0)
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daddiu a0, a0, -8
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bgez a0, 1b
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nop
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/* Set the stack to begin right below the registers */
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dli sp, CVMSEG_BASE + CVMSEG_SIZE - (32 * 8)
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/* Load the address of the third stage handler */
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dla $25, octeon_wdt_nmi_stage3
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/* Call the third stage handler */
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jal $25
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/* a0 is the address of the saved registers */
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move a0, sp
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/* Loop forvever if we get here. */
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2: b 2b
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nop
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.set pop
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END(octeon_wdt_nmi_stage2)
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