src/arch/x86/memset.c

/* SPDX-License-Identifier: GPL-2.0-or-later */

/* From glibc-2.14, sysdeps/i386/memset.c */

#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <asan.h>

typedef uint32_t op_t;

void *memset(void *dstpp, int c, size_t len)
{
	int d0;
	unsigned long int dstp = (unsigned long int)dstpp;

#if (ENV_ROMSTAGE && CONFIG(ASAN_IN_ROMSTAGE)) || \
		(ENV_RAMSTAGE && CONFIG(ASAN_IN_RAMSTAGE))
	check_memory_region((unsigned long)dstpp, len, true, _RET_IP_);
#endif

	/* This explicit register allocation improves code very much indeed. */
	register op_t x asm("ax");

	x = (unsigned char)c;

	/* Clear the direction flag, so filling will move forward.  */
	asm volatile("cld");

	/* This threshold value is optimal.  */
	if (len >= 12) {
		/* Fill X with four copies of the char we want to fill with. */
		x |= (x << 8);
		x |= (x << 16);

		/* Adjust LEN for the bytes handled in the first loop.  */
		len -= (-dstp) % sizeof(op_t);

		/*
		 * There are at least some bytes to set. No need to test for
		 * LEN == 0 in this alignment loop.
		 */

		/* Fill bytes until DSTP is aligned on a longword boundary. */
		asm volatile(
			"rep\n"
			"stosb" /* %0, %2, %3 */ :
			"=D" (dstp), "=c" (d0) :
			"0" (dstp), "1" ((-dstp) % sizeof(op_t)), "a" (x) :
			"memory");

		/* Fill longwords.  */
		asm volatile(
			"rep\n"
			"stosl" /* %0, %2, %3 */ :
			"=D" (dstp), "=c" (d0) :
			"0" (dstp), "1" (len / sizeof(op_t)), "a" (x) :
			"memory");
		len %= sizeof(op_t);
	}

	/* Write the last few bytes. */
	asm volatile(
		"rep\n"
		"stosb" /* %0, %2, %3 */ :
		"=D" (dstp), "=c" (d0) :
		"0" (dstp), "1" (len), "a" (x) :
		"memory");

	return dstpp;
}