cpu.64.c File Reference

64 bit cpu operations More...

#include <cpu.h>
#include <cpu/crx.h>

Functions
	MODULE ("turnstone.kernel.cpu")
uint64_t	cpu_read_msr (uint32_t msr_address)
	read msr and return
int8_t	cpu_write_msr (uint32_t msr_address, uint64_t value)
	writes msr
uint64_t	cpu_read_cr2 (void)
	read cr2 and return
uint64_t	cpu_read_cr3 (void)
	read cr3 and return
cpu_reg_cr4_t	cpu_read_cr4 (void)
	reads cr4 register
void	cpu_write_cr4 (cpu_reg_cr4_t cr4)
	writes cr4 register
cpu_reg_cr0_t	cpu_read_cr0 (void)
	reads cr0 register
void	cpu_write_cr0 (cpu_reg_cr0_t cr0)
	writes cr0 register
void	cpu_toggle_cr0_wp (void)
	toggles write protect bit cr0, when setted kernel can not modify readonly pages
void	cpu_cr0_disable_wp (void)
	disables write protect bit cr0, when setted kernel can not modify readonly pages
void	cpu_cr0_enable_wp (void)
	enables write protect bit cr0, when setted kernel can not modify readonly pages
static void	cpu_enable_avx (void)
void	cpu_enable_sse (void)
	enables sse support, modifies cr4 register
void	cpu_clear_segments (void)
	clears segments
uint64_t	cpu_read_fs_base (void)
uint64_t	cpu_read_gs_base (void)

Detailed Description

64 bit cpu operations

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

Function Documentation

cpu_clear_segments()

void cpu_clear_segments

(

void

)

clears segments

sets segment registers to zero

cpu_read_cr0()

cpu_reg_cr0_t cpu_read_cr0

(

void

)

reads cr0 register

Returns

cr0 value

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_cr4()

cpu_reg_cr4_t cpu_read_cr4

(

void

)

reads cr4 register

Returns

cr4 value

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_write_cr0()

void cpu_write_cr0

(

cpu_reg_cr0_t

cr0

)

writes cr0 register

Parameters

[in]

cr0

cr0 value

cpu_write_cr4()

void cpu_write_cr4

(

cpu_reg_cr4_t

cr4

)

writes cr4 register

Parameters

[in]

cr4

cr4 value

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