FPU::State Struct Reference

512 byte structure for FPU / MMX / SSE registers corresponds to the layout used by the instructions fxsave and fxrstor. More...

#include <machine/fpu.h>

Collaboration diagram for FPU::State:

Classes
struct	ST
	80 bit registers for FPU stack / MMX More...
struct	XMM
	128 bit SSE registers More...

Public Member Functions
void	init ()
	Set structure to the initial FPU state Clears the FPU state (but its not just zeroed!).
void	save ()
	Save the current FPU (+ MMX + SSE) state into this structure.
void	restore ()
	Restore the saved FPU (+ MMX + SSE) state from this structure.

Public Attributes
uint16_t	fcw
	FPU Control Word.
uint16_t	fsw
	FPU Status Word.
uint8_t	ftw
	FPU Tag Word.
uint16_t	: 0
	(16 bit alignment)
uint16_t	fop
	FPU Opcode.
union {
uint64_t	ip
struct {
uint32_t	ip_off
uint32_t	ip_seg
}
};
union {
uint64_t	dp
struct {
uint32_t	dp_off
uint32_t	dp_seg
}
};
uint32_t	mxcsr
uint32_t	mxcsr_mask
struct {
ST	value
uint64_t	: 48
}	st [8]
XMM	xmm [16]
uint64_t	reserved [12]
	(reserved)

Detailed Description

512 byte structure for FPU / MMX / SSE registers corresponds to the layout used by the instructions fxsave and fxrstor.

See also

ISDMv1 Chapter 10.5.1 FXSAVE Area

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Class Documentation

FPU::State::ST

struct FPU::State::ST

80 bit registers for FPU stack / MMX

Class Members
uint64_t	fraction: 63
uint64_t	integer: 1
uint16_t	exponent: 15
uint16_t	sign: 1

FPU::State::XMM

struct FPU::State::XMM

128 bit SSE registers

Class Members
uint64_t	low
uint64_t	high

Member Function Documentation

init()

void State::init

(

)

Set structure to the initial FPU state Clears the FPU state (but its not just zeroed!).

save()

void FPU::State::save ( )

inline

Save the current FPU (+ MMX + SSE) state into this structure.

Note

Structure has to be 16 byte aligned

restore()

void FPU::State::restore ( )

inline

Restore the saved FPU (+ MMX + SSE) state from this structure.

Note

Structure has to be 16 byte aligned

Member Data Documentation

fcw

uint16_t FPU::State::fcw

FPU Control Word.

fsw

uint16_t FPU::State::fsw

FPU Status Word.

ftw

uint8_t FPU::State::ftw

FPU Tag Word.

__pad0__

uint16_t FPU::State::__pad0__

(16 bit alignment)

fop

uint16_t FPU::State::fop

FPU Opcode.

[union]

union { ... } FPU::State

[union]

union { ... } FPU::State

mxcsr

uint32_t FPU::State::mxcsr

mxcsr_mask

uint32_t FPU::State::mxcsr_mask

[struct]

struct { ... } FPU::State::st[8]

xmm

XMM FPU::State::xmm[16]

reserved

uint64_t FPU::State::reserved[12]

(reserved)

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The documentation for this struct was generated from the following files:

• machine/fpu.h
• machine/fpu.cc