mm.h File Reference

#include <zephyr/sys/util.h>
#include <zephyr/toolchain.h>
#include <zephyr/kernel/internal/mm.h>
#include <stdint.h>
#include <stddef.h>
#include <inttypes.h>

Go to the source code of this file.

Macros
Caching mode definitions.
These are mutually exclusive.
#define	K_MEM_CACHE_NONE   2
	No caching.
#define	K_MEM_CACHE_WT   1
	Write-through caching.
#define	K_MEM_CACHE_WB   0
	Full write-back caching.
#define	K_MEM_CACHE_MASK   (BIT(3) - 1)
	Reserved bits for cache modes in k_map() flags argument.
Region permission attributes.
Default is read-only, no user, no exec
#define	K_MEM_PERM_RW   BIT(3)
	Region will have read/write access (and not read-only)
#define	K_MEM_PERM_EXEC   BIT(4)
	Region will be executable (normally forbidden)
#define	K_MEM_PERM_USER   BIT(5)
	Region will be accessible to user mode (normally supervisor-only)
Region mapping behaviour attributes
#define	K_MEM_DIRECT_MAP   BIT(6)
	Region will be mapped to 1:1 virtual and physical address.
k_mem_map() control flags
#define	K_MEM_MAP_UNINIT   BIT(16)
	The mapped region is not guaranteed to be zeroed.
#define	K_MEM_MAP_LOCK   BIT(17)
	Region will be pinned in memory and never paged.
#define	K_MEM_MAP_UNPAGED   BIT(18)
	Region will be unpaged i.e.

Functions
size_t	k_mem_free_get (void)
	Return the amount of free memory available.
static void *	k_mem_map (size_t size, uint32_t flags)
	Map anonymous memory into Zephyr's address space.
static void	k_mem_unmap (void *addr, size_t size)
	Un-map mapped memory.
int	k_mem_update_flags (void *addr, size_t size, uint32_t flags)
	Modify memory mapping attribute flags.
size_t	k_mem_region_align (uintptr_t *aligned_addr, size_t *aligned_size, uintptr_t addr, size_t size, size_t align)
	Given an arbitrary region, provide a aligned region that covers it.