lib/crc/powerpc/crc-vpmsum-template.S

Source file repositories/reference/linux-study-clean/lib/crc/powerpc/crc-vpmsum-template.S

File Facts

System
Linux kernel
Corpus path
lib/crc/powerpc/crc-vpmsum-template.S
Extension
.S
Size
14068 bytes
Lines
747
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: lib
Status
atlas-only

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <asm/ppc_asm.h>
#include <asm/ppc-opcode.h>

#define MAX_SIZE	32768

	.text

#if defined(__BIG_ENDIAN__) && defined(REFLECT)
#define BYTESWAP_DATA
#elif defined(__LITTLE_ENDIAN__) && !defined(REFLECT)
#define BYTESWAP_DATA
#else
#undef BYTESWAP_DATA
#endif

#define off16		r25
#define off32		r26
#define off48		r27
#define off64		r28
#define off80		r29
#define off96		r30
#define off112		r31

#define const1		v24
#define const2		v25

#define byteswap	v26
#define	mask_32bit	v27
#define	mask_64bit	v28
#define zeroes		v29

#ifdef BYTESWAP_DATA
#define VPERM(A, B, C, D) vperm	A, B, C, D
#else
#define VPERM(A, B, C, D)
#endif

/* unsigned int CRC_FUNCTION_NAME(unsigned int crc, void *p, unsigned long len) */
FUNC_START(CRC_FUNCTION_NAME)
	std	r31,-8(r1)
	std	r30,-16(r1)
	std	r29,-24(r1)
	std	r28,-32(r1)
	std	r27,-40(r1)
	std	r26,-48(r1)
	std	r25,-56(r1)

	li	off16,16
	li	off32,32
	li	off48,48
	li	off64,64
	li	off80,80
	li	off96,96
	li	off112,112
	li	r0,0

	/* Enough room for saving 10 non volatile VMX registers */
	subi	r6,r1,56+10*16
	subi	r7,r1,56+2*16

	stvx	v20,0,r6
	stvx	v21,off16,r6
	stvx	v22,off32,r6
	stvx	v23,off48,r6
	stvx	v24,off64,r6
	stvx	v25,off80,r6
	stvx	v26,off96,r6
	stvx	v27,off112,r6
	stvx	v28,0,r7
	stvx	v29,off16,r7

Annotation

Implementation Notes