cpuid.h File Reference

Structures and functions to handle the CPUID. More...

Go to the source code of this file.

Classes
struct	cpuinfo_t
	Contains the information concerning the CPU. More...

Macros
#define	ECX_FLAGS_SIZE   24
	Dimension of the exc flags.
#define	EDX_FLAGS_SIZE   32
	Dimension of the edx flags.

Typedefs
typedef struct cpuinfo_t	cpuinfo_t
	Contains the information concerning the CPU.

Functions
void	get_cpuid (cpuinfo_t *cpuinfo)
	Main CPUID procedure. More...
void	call_cpuid (pt_regs *registers)
	Actual CPUID call. More...
void	cpuid_write_vendor (cpuinfo_t *cpuinfo, pt_regs *registers)
	Extract vendor string. More...
void	cpuid_write_proctype (cpuinfo_t *cpuinfo, pt_regs *registers)
void	cpuid_feature_ecx (cpuinfo_t *cpuinfo, uint32_t ecx)
	EAX=1, ECX contains a list of supported features. More...
void	cpuid_feature_edx (cpuinfo_t *cpuinfo, uint32_t edx)
	EAX=1, EDX contains a list of supported features. More...
uint32_t	cpuid_get_byte (uint32_t reg, uint32_t position, uint32_t value)
	Extract single byte from a register. More...
char *	cpuid_brand_index (pt_regs *f)
	Index of brand strings. TODO: Document. More...
char *	cpuid_brand_string (pt_regs *f)
	Brand string is contained in EAX, EBX, ECX and EDX. More...

Variables
cpuinfo_t	sinfo
	This will be populated with the information concerning the CPU.

Detailed Description

Structures and functions to handle the CPUID.

CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) allowing software to discover details of the processor.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

call_cpuid()

void call_cpuid

(

pt_regs *

registers

)

Actual CPUID call.

Parameters

registers

The registers to fill with the result of the call.

cpuid_brand_index()

char* cpuid_brand_index

(

pt_regs *

f

)

Index of brand strings. TODO: Document.

Parameters

f	Stack frame.

Returns

The brand string.

cpuid_brand_string()

char* cpuid_brand_string

(

pt_regs *

f

)

Brand string is contained in EAX, EBX, ECX and EDX.

Parameters

f	Stack frame.

Returns

The brand string.

cpuid_feature_ecx()

void cpuid_feature_ecx	(	cpuinfo_t *	cpuinfo,
		uint32_t	ecx
	)

EAX=1, ECX contains a list of supported features.

Parameters

cpuinfo
ecx

cpuid_feature_edx()

void cpuid_feature_edx	(	cpuinfo_t *	cpuinfo,
		uint32_t	edx
	)

EAX=1, EDX contains a list of supported features.

Parameters

cpuinfo
edx

cpuid_get_byte()

uint32_t cpuid_get_byte ( uint32_t  reg, uint32_t  position, uint32_t  value  )

inline

Extract single byte from a register.

Parameters

reg
position
value

Returns

cpuid_write_proctype()

void cpuid_write_proctype	(	cpuinfo_t *	cpuinfo,
		pt_regs *	registers
	)

Parameters

cpuinfo
registers

CPUID is called with EAX=1 EAX contains Type, Family, Model and Stepping ID EBX contains the Brand Index if supported, and the APIC ID ECX/EDX contains feature information

cpuid_write_vendor()

void cpuid_write_vendor	(	cpuinfo_t *	cpuinfo,
		pt_regs *	registers
	)

Extract vendor string.

Parameters

cpuinfo	The struct containing the CPUID infos.
registers	The registers.

get_cpuid()

void get_cpuid

(

cpuinfo_t *

cpuinfo

)

Main CPUID procedure.

Parameters

cpuinfo

Structure to fill with CPUID information.