Operations for memory access. More...

Collaboration diagram for Memory operations.:

Enumerations
enum	L4_mem_op_widths { L4_MEM_WIDTH_1BYTE = 0 , L4_MEM_WIDTH_2BYTE = 1 , L4_MEM_WIDTH_4BYTE = 2 }
	Memory access width definitions. More...

Functions
unsigned long	l4_mem_read (unsigned long virtaddress, unsigned width)
	Read user task memory from kernel privilege level.

void	l4_mem_write (unsigned long virtaddress, unsigned width, unsigned long value)
	Write user task memory from kernel privilege level.

Detailed Description

Operations for memory access.

This module provides functionality to access user task memory from the kernel. This is needed for some devices that are only accessible from privileged processor mode. Only use this when absolutely required. This functionality is only available on the ARM architecture.

#include <l4/sys/mem_op.h>

Enumeration Type Documentation

◆ L4_mem_op_widths

enum L4_mem_op_widths

Memory access width definitions.

Enumerator
L4_MEM_WIDTH_1BYTE	Access one byte (8-bit width)
L4_MEM_WIDTH_2BYTE	Access two bytes (16-bit width)
L4_MEM_WIDTH_4BYTE	Access four bytes (32-bit width)

Definition at line 51 of file mem_op.h.

Function Documentation

◆ l4_mem_read()

unsigned long l4_mem_read	(	unsigned long	virtaddress,
		unsigned	width
	)

inline

Read user task memory from kernel privilege level.

Parameters

virtaddress	Virtual address in the calling task.
width	Width of access in bytes in log2,

See also: L4_mem_op_widths

Returns: Read value.

Upon an given invalid address or invalid width value the function does nothing.

Definition at line 141 of file mem_op.h.

References l4_mem_arm_op_call().

Here is the call graph for this function:

◆ l4_mem_write()

void l4_mem_write	(	unsigned long	virtaddress,
		unsigned	width,
		unsigned long	value
	)