mem.c File Reference

#include "core/mem.h"
#include "macros.h"
#include <stdlib.h>
#include <sys/mman.h>

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Functions
memory	init_memory ()
	This function allocate on the heap a memory of exactly TOTAL_MEMORY_SIZE.
void	reset_memory (memory mem)
	This procedure set the entire memory to 0.
void	free_memory (memory mem)
	This procedure free the memory pointer.
void	memory_mirroring (memory mem)
	This procedure make the memory mirroring.

Function Documentation

free_memory()

void free_memory

(

memory

mem

)

This procedure free the memory pointer.

Parameters

[in]

mem

The memory pointer

Definition at line 25 of file mem.c.

                             {
    munmap(mem, TOTAL_MEM_SIZE);
}

References TOTAL_MEM_SIZE.

Referenced by free_cpu().

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init_memory()

memory init_memory

(

)

This function allocate on the heap a memory of exactly TOTAL_MEMORY_SIZE.

Returns

The memory pointer

Definition at line 7 of file mem.c.

                     {
 
    memory mem =
        mmap(NULL, TOTAL_MEM_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
 
    if (mem == MAP_FAILED) {
        exit(EXIT_FAILURE);
    }
 
    return mem;
}

References EXIT_FAILURE, and TOTAL_MEM_SIZE.

Referenced by main().

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memory_mirroring()

void memory_mirroring

(

memory

mem

)

This procedure make the memory mirroring.

Parameters

[in,out]

mem

The memory pointer

Definition at line 29 of file mem.c.

                                  {
    for (unsigned int i = 0; i < 0x800; ++i) {
        mem[RAM_MIRROR_1_START + i] = mem[i];
        mem[RAM_MIRROR_2_START + i] = mem[i];
        mem[RAM_MIRROR_3_START + i] = mem[i];
    }
 
    for (unsigned int i = 0; i < 0x1ff8; i += 8) {
        mem[PPU_MIRRORS_START_ZERO + i] = mem[PPU_REG_ZERO];
        mem[PPU_MIRRORS_START_ONE + i] = mem[PPU_REG_ONE];
        mem[PPU_MIRRORS_START_TWO + i] = mem[PPU_REG_TWO];
        mem[PPU_MIRRORS_START_THREE + i] = mem[PPU_REG_THREE];
        mem[PPU_MIRRORS_START_FOUR + i] = mem[PPU_REG_FOUR];
        mem[PPU_MIRRORS_START_FIVE + i] = mem[PPU_REG_FIVE];
        mem[PPU_MIRRORS_START_SIX + i] = mem[PPU_REG_SIX];
        mem[PPU_MIRRORS_START_SEVEN + i] = mem[PPU_REG_SEVEN];
    }
}

References PPU_MIRRORS_START_FIVE, PPU_MIRRORS_START_FOUR, PPU_MIRRORS_START_ONE, PPU_MIRRORS_START_SEVEN, PPU_MIRRORS_START_SIX, PPU_MIRRORS_START_THREE, PPU_MIRRORS_START_TWO, PPU_MIRRORS_START_ZERO, PPU_REG_FIVE, PPU_REG_FOUR, PPU_REG_ONE, PPU_REG_SEVEN, PPU_REG_SIX, PPU_REG_THREE, PPU_REG_TWO, PPU_REG_ZERO, RAM_MIRROR_1_START, RAM_MIRROR_2_START, and RAM_MIRROR_3_START.

Referenced by step_cpu().

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reset_memory()

void reset_memory

(

memory

mem

)

This procedure set the entire memory to 0.

Parameters

[in,out]

mem

The memory pointer

Definition at line 19 of file mem.c.

                              {
    for (unsigned int i = 0; i < TOTAL_MEM_SIZE; ++i) {
        mem[i] = 0x00;
    }
}

References TOTAL_MEM_SIZE.

Referenced by main().

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