cpu.h File Reference

cpu commands which needs assembly codes. More...

#include <types.h>

Classes
struct	cpu_cpuid_regs_t
	cpuid command set/get registers. More...

Macros
#define	___CPU_H   0

Typedefs
typedef struct cpu_cpuid_regs_t	cpu_cpuid_regs_t
	struct short hand

Functions
void	cpu_hlt (void)
	stops cpu. More...
void	cpu_idle (void)
static boolean_t	cpu_cli (void)
	disables interrupts More...
static void	cpu_sti (void)
	enables interrupts More...
static void	cpu_nop (void)
	nop instruction More...
static void	cpu_cld (void)
	cld instruction More...
uint16_t	cpu_read_data_segment (void)
	reads data segment (ds) value from cpu. More...
int8_t	cpu_check_rdrand (void)
	checks rdrand supported More...
uint64_t	cpu_read_msr (uint32_t msr_address)
	read msr and return More...
int8_t	cpu_write_msr (uint32_t msr_address, uint64_t value)
	writes msr More...
uint64_t	cpu_read_cr2 (void)
	read cr2 and return More...
uint64_t	cpu_read_cr3 (void)
	read cr3 and return More...
uint8_t	cpu_cpuid (cpu_cpuid_regs_t query, cpu_cpuid_regs_t *answer)
void	cpu_clear_segments (void)
	clears segments More...
static void	cpu_set_and_clear_stack (uint64_t stack_address)
	prepares stack More...
static void	cpu_tlb_invalidate (void *address)
	invalidates tlb for address More...
static void	cpu_tlb_flush (void)
boolean_t	cpu_is_interrupt_enabled (void)
uint64_t	cpu_read_fs_base (void)
uint64_t	cpu_read_gs_base (void)

Detailed Description

cpu commands which needs assembly codes.

This work is licensed under TURNSTONE OS Public License. Please read and understand latest version of Licence.

Macro Definition Documentation

___CPU_H

#define ___CPU_H   0

prevent duplicate header error macro

Function Documentation

cpu_check_rdrand()

int8_t cpu_check_rdrand

(

void

)

checks rdrand supported

Returns

0 when supported else -1

cpu_cld()

static void cpu_cld ( void  )

inlinestatic

cld instruction

This command clears direction flag.

cpu_clear_segments()

void cpu_clear_segments

(

void

)

clears segments

sets segment registers to zero

cpu_cli()

static boolean_t cpu_cli ( void  )

inlinestatic

disables interrupts

This command disables interrupts with cli assembly command.

cpu_hlt()

void cpu_hlt

(

void

)

stops cpu.

This command stops cpu using hlt assembly command inside for.

cpu_nop()

static void cpu_nop ( void  )

inlinestatic

nop instruction

This command nops.

cpu_read_cr2()

uint64_t cpu_read_cr2

(

void

)

read cr2 and return

Returns

cr2 value

returns cr2 value for page faults

cpu_read_cr3()

uint64_t cpu_read_cr3

(

void

)

read cr3 and return

Returns

cr3 value

returns cr3 value for page tables

cpu_read_data_segment()

uint16_t cpu_read_data_segment

(

void

)

reads data segment (ds) value from cpu.

Returns

ds value

This function is meaningful at real mode. At long mode is does nothing

cpu_read_msr()

uint64_t cpu_read_msr

(

uint32_t

msr_address

)

read msr and return

Parameters

[in]

msr_address

model Specific register address

Returns

msr value

returns edx:eax as uint64_t

cpu_set_and_clear_stack()

static void cpu_set_and_clear_stack ( uint64_t  stack_address )

inlinestatic

prepares stack

Parameters

[in]

stack_address

stack top value

sets esp and clears ebp

cpu_sti()

static void cpu_sti ( void  )

inlinestatic

enables interrupts

This command enables interrupts with sti assembly command.

cpu_tlb_invalidate()

static void cpu_tlb_invalidate ( void *  address )

inlinestatic

invalidates tlb for address

Parameters

[in]

address

adddress to invalidate

calls invlpg instruction

cpu_write_msr()

int8_t cpu_write_msr	(	uint32_t	msr_address,
		uint64_t	value
	)

writes msr

Parameters

[in]	msr_address	model Specific register address
[in]	value	value to write

Returns

0 on sucess

parse value into edx:eax