paging_kernel_target.h File Reference

x86-32 kernel page-table structures. More...

Data Structures
union	x86_32_pdir_entry
union	x86_32_ptable_entry

Macros
#define	X86_32_PTABLE_FLAGS_MASK
	All arch-specific flags valid to be set from user-space.
#define	X86_32_PTABLE_ACCESS_MASK
	All flags valid for page access protection from user-space.
#define	X86_32_PTABLE_FLAGS(flags)   (flags & X86_32_PTABLE_FLAGS_MASK)
	Mask out all arch-specific flags except those valid from user-space.
#define	X86_32_PTABLE_ACCESS(flags)   (flags & X86_32_PTABLE_ACCESS_MASK)
	Mask out all flags except those for access protection.
#define	X86_32_IS_PRESENT(entry)   ((*(uint32_t *)(entry)) & X86_32_PTABLE_PRESENT)

Functions
void	paging_x86_32_make_good_pdir (lpaddr_t base)
	Make a "good" PDE table out of a page table. More...
void	paging_x86_32_reset (void)
	Reset kernel paging. More...

Detailed Description

x86-32 kernel page-table structures.

Macro Definition Documentation

#define X86_32_IS_PRESENT

(

entry

)

((*(uint32_t *)(entry)) & X86_32_PTABLE_PRESENT)

True if page entry is present in memory

Function Documentation

void paging_x86_32_make_good_pdir

(

lpaddr_t

base

)

Make a "good" PDE table out of a page table.

A "good" PDE table is one that has all physical address space and the kernel mapped in. This function modifies the passed PDE, based at physical address 'base' accordingly. It does this by taking out the corresponding entries of the kernel's pristine PDE table.

Parameters

base	Physical base address of PDE table to make "good".

void paging_x86_32_reset

(

void

)

Reset kernel paging.

This function resets the page maps for kernel and memory-space. It clears out all other mappings. Use this only at system bootup!