MMU

Memory Management Unit. More...

Collaboration diagram for MMU:

Data Structures
union	mmu_page_fault_error_t
	page fault error information More...

Functions
void	mmu_load_page_directory (page_directory_t *page_directory)
	Loads a page directory into the CR3 register. More...
void	mmu_enable_paging (page_directory_t *page_directory)
	Loads a page directory and enables paging. More...
uint8_t	mmu_get_paging ()
	Returns whether paging is enabled or disabled. More...
void	mmu_flush_tlb (void *vaddr)
	Flushes the Translation Lookaside Buffer for the given page. More...
static cpu_state_t *	mmu_handle_page_fault (cpu_state_t *cpu)
	Handles page faults. More...
void	mmu_init ()
	Initializes the MMU.

Detailed Description

Memory Management Unit.

The MMU deals with technical details of paging and the Translation Lookaside Buffer.

See also

http://wiki.osdev.org/Memory_Management_Unit

http://www.lowlevel.eu/wiki/Steuerregister

http://wiki.osdev.org/TLB

Function Documentation

void mmu_enable_paging

(

page_directory_t *

page_directory

)

Loads a page directory and enables paging.

Parameters

page_directory

physical address of a page directory (or 0 if paging should be disabled)

Definition at line 44 of file mmu.c.

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void mmu_flush_tlb

(

void *

vaddr

)

Flushes the Translation Lookaside Buffer for the given page.

This removes any cached mapping from virtual to physical addresses for this page, which is necessary when page directories are modified while they are in use.

Parameters

vaddr

the virtual address of a page to flush

Definition at line 69 of file mmu.c.

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uint8_t mmu_get_paging

(

)

Returns whether paging is enabled or disabled.

Returns

paging flag

Definition at line 57 of file mmu.c.

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static cpu_state_t* mmu_handle_page_fault ( cpu_state_t *  cpu )

static

Handles page faults.

Parameters

cpu	the CPU state

Returns

a (possibly altered) CPU state

Definition at line 80 of file mmu.c.

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void mmu_load_page_directory

(

page_directory_t *

page_directory

)

Loads a page directory into the CR3 register.

Parameters

page_directory

physical address of a page directory

Definition at line 34 of file mmu.c.

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