arch/riscv/include/asm/word-at-a-time.h

Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/word-at-a-time.h

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/word-at-a-time.h
Extension
.h
Size
1766 bytes
Lines
77
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct word_at_a_time {
	const unsigned long one_bits, high_bits;
};

#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }

static inline unsigned long has_zero(unsigned long val,
	unsigned long *bits, const struct word_at_a_time *c)
{
	unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits;
	*bits = mask;
	return mask;
}

static inline unsigned long prep_zero_mask(unsigned long val,
	unsigned long bits, const struct word_at_a_time *c)
{
	return bits;
}

static inline unsigned long create_zero_mask(unsigned long bits)
{
	bits = (bits - 1) & ~bits;
	return bits >> 7;
}

static inline unsigned long find_zero(unsigned long mask)
{
	return fls64(mask) >> 3;
}

/* The mask we created is directly usable as a bytemask */
#define zero_bytemask(mask) (mask)

#ifdef CONFIG_DCACHE_WORD_ACCESS

/*
 * Load an unaligned word from kernel space.
 *
 * In the (very unlikely) case of the word being a page-crosser
 * and the next page not being mapped, take the exception and
 * return zeroes in the non-existing part.
 */
static inline unsigned long load_unaligned_zeropad(const void *addr)
{
	unsigned long ret;

	/* Load word from unaligned pointer addr */
	asm(
	"1:	" REG_L " %0, %2\n"
	"2:\n"
	_ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(1b, 2b, %0, %1)
	: "=&r" (ret)
	: "r" (addr), "m" (*(unsigned long *)addr));

	return ret;
}

#endif	/* CONFIG_DCACHE_WORD_ACCESS */

#endif /* _ASM_RISCV_WORD_AT_A_TIME_H */

Annotation

Implementation Notes