mmu.h File Reference

Memory Management Unit (MMU) interface for ARM32 architecture. More...

#include "timer.h"
#include "barrier.h"
#include "cache.h"
#include "interrupt.h"

Include dependency graph for mmu.h:

Go to the source code of this file.

Classes
struct	arm_regs_t
	ARM32 register structure. More...

Functions
static uint32_t	arm32_read_p15_c1 (void)
	Read the ARM32 system control register (CP15, c1).
static void	arm32_write_p15_c1 (uint32_t value)
	Write to the ARM32 system control register (CP15, c1).
static void	arm32_mmu_enable (const uint32_t dram_base, uint32_t dram_size)
	Enable the ARM32 MMU with specific memory configuration.
static void	arm32_mmu_disable (void)
	Disable the ARM32 MMU and clear caches.

Detailed Description

Memory Management Unit (MMU) interface for ARM32 architecture.

This header file provides functions and definitions for managing the Memory Management Unit on ARM32 architecture. It includes functions for enabling/disabling MMU and MMU control operations.

Function Documentation

arm32_mmu_disable()

static void arm32_mmu_disable ( void  )

inlinestatic

Disable the ARM32 MMU and clear caches.

This function disables the Memory Management Unit (MMU), instruction cache, and data cache. It also invalidates the instruction cache, branch predictor, and ensures all operations are completed with memory barriers.

arm32_mmu_enable()

static void arm32_mmu_enable ( const uint32_t  dram_base, uint32_t  dram_size  )

inlinestatic

Enable the ARM32 MMU with specific memory configuration.

This function initializes and enables the Memory Management Unit (MMU) for ARM32 architecture. It sets up page tables with appropriate memory attributes and configures the MMU control registers.

Parameters

dram_base	Base address of DRAM memory.
dram_size	Size of DRAM memory in megabytes.

Note

The function creates a 1MB section-based page table in the highest 16MB of DRAM. It configures different memory regions with appropriate caching attributes.

arm32_read_p15_c1()

static uint32_t arm32_read_p15_c1 ( void  )

inlinestatic

Read the ARM32 system control register (CP15, c1).

This function reads the value of the ARM32 system control register (CP15, c1), which controls various system features including MMU, caches, and alignment checking.

Returns

The value of the system control register.

arm32_write_p15_c1()

static void arm32_write_p15_c1 ( uint32_t  value )

inlinestatic

Write to the ARM32 system control register (CP15, c1).

This function writes a value to the ARM32 system control register (CP15, c1), which controls various system features including MMU, caches, and alignment checking. A read-back is performed to ensure the write is completed.

Parameters

value

The value to write to the system control register.