drivers/watchdog/octeon-wdt-nmi.S

Source file repositories/reference/linux-study-clean/drivers/watchdog/octeon-wdt-nmi.S

File Facts

System
Linux kernel
Corpus path
drivers/watchdog/octeon-wdt-nmi.S
Extension
.S
Size
1910 bytes
Lines
88
Domain
Driver Families
Bucket
drivers/watchdog
Inferred role
Driver Families: drivers/watchdog
Status
atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#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

Annotation

Implementation Notes