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