arch/mips/math-emu/ieee754.h

Source file repositories/reference/linux-study-clean/arch/mips/math-emu/ieee754.h

File Facts

System
Linux kernel
Corpus path
arch/mips/math-emu/ieee754.h
Extension
.h
Size
9992 bytes
Lines
312
Domain
Architecture Layer
Bucket
arch/mips
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 _ieee754_csr {
	__BITFIELD_FIELD(unsigned fcc:7,	/* condition[7:1] */
	__BITFIELD_FIELD(unsigned nod:1,	/* set 1 for no denormals */
	__BITFIELD_FIELD(unsigned c:1,		/* condition[0] */
	__BITFIELD_FIELD(unsigned pad0:3,
	__BITFIELD_FIELD(unsigned abs2008:1,	/* IEEE 754-2008 ABS/NEG.fmt */
	__BITFIELD_FIELD(unsigned nan2008:1,	/* IEEE 754-2008 NaN mode */
	__BITFIELD_FIELD(unsigned cx:6,		/* exceptions this operation */
	__BITFIELD_FIELD(unsigned mx:5,		/* exception enable  mask */
	__BITFIELD_FIELD(unsigned sx:5,		/* exceptions total */
	__BITFIELD_FIELD(unsigned rm:2,		/* current rounding mode */
	;))))))))))
};
#define ieee754_csr (*(struct _ieee754_csr *)(&current->thread.fpu.fcr31))

static inline unsigned int ieee754_getrm(void)
{
	return (ieee754_csr.rm);
}

static inline unsigned int ieee754_setrm(unsigned int rm)
{
	return (ieee754_csr.rm = rm);
}

/*
 * get current exceptions
 */
static inline unsigned int ieee754_getcx(void)
{
	return (ieee754_csr.cx);
}

/* test for current exception condition
 */
static inline int ieee754_cxtest(unsigned int n)
{
	return (ieee754_csr.cx & n);
}

/*
 * get sticky exceptions
 */
static inline unsigned int ieee754_getsx(void)
{
	return (ieee754_csr.sx);
}

/* clear sticky conditions
*/
static inline unsigned int ieee754_clrsx(void)
{
	return (ieee754_csr.sx = 0);
}

/* test for sticky exception condition
 */
static inline int ieee754_sxtest(unsigned int n)
{
	return (ieee754_csr.sx & n);
}

/* debugging */
union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);

#define IEEE754_SPCVAL_PZERO		0	/* +0.0 */
#define IEEE754_SPCVAL_NZERO		1	/* -0.0 */
#define IEEE754_SPCVAL_PONE		2	/* +1.0 */
#define IEEE754_SPCVAL_NONE		3	/* -1.0 */
#define IEEE754_SPCVAL_PTEN		4	/* +10.0 */
#define IEEE754_SPCVAL_NTEN		5	/* -10.0 */
#define IEEE754_SPCVAL_PINFINITY	6	/* +inf */
#define IEEE754_SPCVAL_NINFINITY	7	/* -inf */
#define IEEE754_SPCVAL_INDEF_LEG	8	/* legacy quiet NaN */
#define IEEE754_SPCVAL_INDEF_2008	9	/* IEEE 754-2008 quiet NaN */
#define IEEE754_SPCVAL_PMAX		10	/* +max norm */
#define IEEE754_SPCVAL_NMAX		11	/* -max norm */
#define IEEE754_SPCVAL_PMIN		12	/* +min norm */
#define IEEE754_SPCVAL_NMIN		13	/* -min norm */
#define IEEE754_SPCVAL_PMIND		14	/* +min denorm */
#define IEEE754_SPCVAL_NMIND		15	/* -min denorm */
#define IEEE754_SPCVAL_P1E31		16	/* + 1.0e31 */
#define IEEE754_SPCVAL_P1E63		17	/* + 1.0e63 */

extern const union ieee754dp __ieee754dp_spcvals[];
extern const union ieee754sp __ieee754sp_spcvals[];
#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)

Annotation

Implementation Notes