x86_multiboot/boot/mmu.c File Reference

#include "mmu.h"
#include "multiboot.h"
#include <stdint.h>
#include "debug.h"
#include "mal.h"
#include "structures.h"
#include "fpinfo.h"
#include "hdef.h"
#include <libc.h>

Macros
#define	GLOBAL_BIT   (1 << 8)

Functions
void	mapPageC (uintptr_t pd, uintptr_t p, uintptr_t v, uint8_t user)
void	prepareC (uintptr_t pd, uintptr_t v, uintptr_t *pageList)
	Prepares a Page Directory to receive a mapping by inserting the according Page Table. More...
uint32_t	pageCountMapPageC (uintptr_t pd, uintptr_t vaddr)
	tests if there is a page table in pd at vaddr More...
void	mapPageWrapper (page_directory_t *dir, uint32_t paddr, uint32_t vaddr, uint8_t user)
void	initFreePageList (uintptr_t base, uintptr_t length)
uint32_t *	allocPage ()
	Unsafe page allocator. Allocated a page. More...
void	freePage (uint32_t *page)
	Frees a page in a really unsafe way. More...
void	dumpMmap (uint32_t *mmap_ptr, uint32_t len)
	Despite its unexplicit name, this function initializes the physical memory, preparing the page allocator as well. More...
void	mark_kernel_global ()
	Marks the whole kernel area as global, preventing TLB invalidations. More...
void	initMmu ()
	Initializes the MMU, creating the kernel's page directory and switching to it. More...

Variables
page_directory_t *	kernelDirectory =0
	The kernel's page directory. More...
uint32_t	maxPages = 0
	The maximal amount of pages available. More...
uint32_t	allocatedPages = 0
	The current allocated amount of pages. More...
uint32_t	ramEnd = 0
	End of memory. More...
uint32_t	pageCount = 0
uint32_t *	firstFreePage
	First free available page. More...
uint32_t	placement_address
	Placement address, this should be unused. More...

Macro Definition Documentation

GLOBAL_BIT

#define GLOBAL_BIT   (1 << 8)

Function Documentation

allocPage()

uint32_t* allocPage

(

)

Unsafe page allocator. Allocated a page.

Returns

Virtual address to a free page.

dumpMmap()

void dumpMmap	(	uint32_t *	mmap_ptr,
		uint32_t	len
	)

Despite its unexplicit name, this function initializes the physical memory, preparing the page allocator as well.

Parameters

mmap_ptr	Pointer to a multiboot-compliant memory map
len	Length of the memory map structure

freePage()

void freePage

(

uint32_t *

page

)

Frees a page in a really unsafe way.

Parameters

page	The page to free.

initFreePageList()

void initFreePageList	(	uintptr_t	base,
		uintptr_t	length
	)

initMmu()

void initMmu

(

)

Initializes the MMU, creating the kernel's page directory and switching to it.

mapPageC()

void mapPageC	(	uintptr_t	pd,
		uintptr_t	p,
		uintptr_t	v,
		uint8_t	user
	)

mapPageWrapper()

void mapPageWrapper	(	page_directory_t *	dir,
		uint32_t	paddr,
		uint32_t	vaddr,
		uint8_t	user
	)

mark_kernel_global()

void mark_kernel_global

(

)

Marks the whole kernel area as global, preventing TLB invalidations.

pageCountMapPageC()

uintptr_t pageCountMapPageC	(	uintptr_t	pd,
		uintptr_t	vaddr
	)

tests if there is a page table in pd at vaddr

Parameters

pd	a page directory
uintptr_t	vaddr

Returns

1 if there is no page table at position pd_idx, 0 else

prepareC()

void prepareC	(	uintptr_t	pd,
		uintptr_t	v,
		uintptr_t *	page_list
	)

Prepares a Page Directory to receive a mapping by inserting the according Page Table.

Parameters

pd	a page directory
v	a virtual address
page_list

Variable Documentation

allocatedPages

uint32_t allocatedPages = 0

The current allocated amount of pages.

firstFreePage

uint32_t* firstFreePage

First free available page.

kernelDirectory

page_directory_t* kernelDirectory =0

The kernel's page directory.

maxPages

uint32_t maxPages = 0

The maximal amount of pages available.

pageCount

uint32_t pageCount = 0

placement_address

uint32_t placement_address

Placement address, this should be unused.

ramEnd

uint32_t ramEnd = 0

End of memory.