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#include "devfs.h"
#include "device.h"
#include "common.h"
#include "gfx.h"
#include "framebuffer.h"
#include "vmm.h"
#include "process.h"
static BOOL fb_open(File *file, uint32 flags);
static int32 fb_read(File *file, uint32 size, uint8 *buffer);
static int32 fb_write(File *file, uint32 size, uint8 *buffer);
static int32 fb_ioctl(File *node, int32 request, void * argp);
static void* fb_mmap(File* file, uint32 size, uint32 offset, uint32 flags);
static BOOL fb_munmap(File* file, void* address, uint32 size);
static uint8* gFrameBufferPhysical = 0;
static uint8* gFrameBufferVirtual = 0;
void initializeFrameBuffer(uint8* p_address, uint8* v_address)
{
gFrameBufferPhysical = p_address;
gFrameBufferVirtual = v_address;
Device device;
memset((uint8*)&device, 0, sizeof(Device));
strcpy(device.name, "fb0");
device.deviceType = FT_CharacterDevice;
device.open = fb_open;
device.read = fb_read;
device.write = fb_write;
device.ioctl = fb_ioctl;
device.mmap = fb_mmap;
device.munmap = fb_munmap;
registerDevice(&device);
}
static BOOL fb_open(File *file, uint32 flags)
{
return TRUE;
}
static int32 fb_read(File *file, uint32 size, uint8 *buffer)
{
if (size == 0)
{
return 0;
}
return -1;
}
static int32 fb_write(File *file, uint32 size, uint8 *buffer)
{
if (size == 0)
{
return 0;
}
int32 requestedSize = size;
int32 length = Gfx_GetWidth() * Gfx_GetHeight() * 4;
int32 availableSize = length - file->offset;
if (availableSize <= 0)
{
return -1;
}
int32 targetSize = MIN(requestedSize, availableSize);
memcpy(gFrameBufferVirtual + file->offset, buffer, targetSize);
file->offset += targetSize;
return targetSize;
}
static int32 fb_ioctl(File *node, int32 request, void * argp)
{
int32 result = -1;
switch (request)
{
case FB_GET_WIDTH:
result = Gfx_GetWidth();
break;
case FB_GET_HEIGHT:
result = Gfx_GetHeight();
break;
case FB_GET_BITSPERPIXEL:
result = 32;
break;
}
return result;
}
static void* fb_mmap(File* file, uint32 size, uint32 offset, uint32 flags)
{
return mapMemory(file->thread->owner, size, (uint32)(gFrameBufferPhysical + offset), NULL);
}
static BOOL fb_munmap(File* file, void* address, uint32 size)
{
return unmapMemory(file->thread->owner, size, (uint32)address);
}
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