mmap.c File Reference

#include "mos/io/io.h"
#include "mos/mm/mm.h"
#include "mos/mm/paging/table_ops.h"
#include "mos/platform/platform.h"
#include "mos/syslog/printk.h"
#include <mos/mm/cow.h>
#include <mos/mm/mm_types.h>
#include <mos/mm/mmap.h>
#include <mos/mm/paging/paging.h>
#include <mos/mos_global.h>
#include <mos/tasks/process.h>
#include <mos/tasks/task_types.h>

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Functions
static bool	mmap_verify_arguments (ptr_t *hint_addr, mmap_flags_t mmap_flags)
	Check if the mmap flags are valid.
ptr_t	mmap_anonymous (mm_context_t *ctx, ptr_t hint_addr, mmap_flags_t flags, vm_flags vm_flags, size_t n_pages)
	Map a page into the current process's address space.
ptr_t	mmap_file (mm_context_t *ctx, ptr_t hint_addr, mmap_flags_t flags, vm_flags vm_flags, size_t n_pages, io_t *io, off_t offset)
	Map a file into the current process's address space.
bool	munmap (ptr_t addr, size_t size)
	Unmap a page from the current process's address space.
bool	vm_protect (mm_context_t *mmctx, ptr_t addr, size_t size, vm_flags perm)
	Change the permissions of a mapping.

Function Documentation

mmap_verify_arguments()

static bool mmap_verify_arguments ( ptr_t * hint_addr, mmap_flags_t mmap_flags )

static

Check if the mmap flags are valid.

Parameters

hint_addr	The hint address
mmap_flags	The mmap flags

Definition at line 23 of file mmap.c.

Referenced by mmap_anonymous(), and mmap_file().

mmap_anonymous()

ptr_t mmap_anonymous	(	mm_context_t *	ctx,
		ptr_t	hint_addr,
		mmap_flags_t	flags,
		vm_flags	vm_flags,
		size_t	n_pages )

Map a page into the current process's address space.

Parameters

ctx	The memory management context
hint_addr	A hint for the address to map the page at, the actual address is determined based on the flags
flags	Flags to control the mapping, see mmap_flags_t
vm_flags	Flags to control the permissions of the mapping, see vm_flags
n_pages	Number of pages to map

Returns

ptr_t The address the page was mapped at, or 0 if the mapping failed

Definition at line 54 of file mmap.c.

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mmap_file()

ptr_t mmap_file	(	mm_context_t *	ctx,
		ptr_t	hint_addr,
		mmap_flags_t	flags,
		vm_flags	vm_flags,
		size_t	n_pages,
		io_t *	io,
		off_t	offset )

Map a file into the current process's address space.

Parameters

ctx	The memory management context
hint_addr	A hint for the address to map the page at, the actual address is determined based on the flags
flags	Flags to control the mapping, see mmap_flags_t
vm_flags	Flags to control the permissions of the mapping, see vm_flags
n_pages	Number of pages to map
io	The io object to map, the io object must be backed by a file_t
offset	The offset into the file to map, must be page aligned

Returns

ptr_t The address the page was mapped at, or 0 if the mapping failed

Definition at line 73 of file mmap.c.

Referenced by elf_map_segment().

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munmap()

bool munmap	(	ptr_t	addr,
		size_t	size )

Unmap a page from the current process's address space.

Parameters

addr	The address to unmap
size	The size of the mapping to unmap

Returns

true If the unmap succeeded

Note

Neither addr nor size need to be page aligned, all pages contained within the range specified will be unmapped even if they are not fully contained within the range.

Definition at line 111 of file mmap.c.

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vm_protect()

bool vm_protect	(	mm_context_t *	mmctx,
		ptr_t	addr,
		size_t	size,
		vm_flags	perm )

Change the permissions of a mapping.

Parameters

mmctx	The memory management context
addr	The address of the mapping to change
size	The size of the mapping to change
perm	The new permissions for the mapping

Definition at line 144 of file mmap.c.

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