upiwin/src/fbinit.c

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C
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#include <stddef.h>
#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
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#include <linux/fb.h>
#include "config.h"
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#include "log.h"
#include "fbinit.h"
#include "scode.h"
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/* references to splash screen data in splash.o/splash.bin */
extern uint8_t _binary_splash_bin_start[];
extern uint8_t _binary_splash_bin_end;
extern uint8_t _binary_splash_bin_size;
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static int fb_fd = -1; /* framebuffer file descriptor */
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/* frame buffer information */
static FBINFO local_info;
PCFBINFO Fb_Info = &local_info;
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UINT16 *Fb_Ptr = NULL; /* pointer to memory-mapped frame buffer */
inline static UINT16 makemask(unsigned offset, unsigned length)
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{
return (UINT16)(((1 << length) - 1) << offset);
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}
static void do_cleanup(void)
{
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/* black out the display */
memset(Fb_Ptr, 0, local_info.screenbytes);
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munmap((void *)Fb_Ptr, local_info.screenbytes);
Fb_Ptr = NULL;
close(fb_fd);
fb_fd = -1;
}
HRESULT Fb_setup(void)
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{
HRESULT hr = S_OK;
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struct fb_fix_screeninfo fixed;
struct fb_var_screeninfo var;
fb_fd = open(Gconfig.framebuffer_device, O_RDWR);
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if (fb_fd == -1)
{
hr = ERRNO_AS_SCODE;
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Log(LFATAL, "Unable to open framebuffer device %s (%08X)", Gconfig.framebuffer_device, hr);
return hr;
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}
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/* fixed info is needed to get the memory parameters for the display */
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if (ioctl(fb_fd, FBIOGET_FSCREENINFO, &fixed))
{
hr = ERRNO_AS_SCODE;
Log(LFATAL, "Could not get fixed screen info (%08X)", hr);
return hr;
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}
local_info.linebytes = fixed.line_length;
local_info.screenbytes = fixed.smem_len;
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/* variable info is used to get scren geometry and color info */
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if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &var))
{
hr = ERRNO_AS_SCODE;
Log(LFATAL, "Could not get variable screen info (%08X)", hr);
return hr;
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}
local_info.width = var.xres;
local_info.height = var.yres;
local_info.virtual_width = var.xres_virtual;
local_info.virtual_height = var.yres_virtual;
local_info.bpp = var.bits_per_pixel;
local_info.red_offset = var.red.offset;
local_info.red_length = var.red.length;
local_info.red_mask = makemask(var.red.offset, var.red.length);
local_info.green_offset = var.green.offset;
local_info.green_length = var.green.length;
local_info.green_mask = makemask(var.green.offset, var.green.length);
local_info.blue_offset = var.blue.offset;
local_info.blue_length = var.blue.length;
local_info.blue_mask = makemask(var.blue.offset, var.blue.length);
Fb_Ptr = (UINT16 *)mmap(0, fixed.smem_len, PROT_READ|PROT_WRITE, MAP_SHARED, fb_fd, 0);
if ((int)Fb_Ptr == -1)
{
hr = ERRNO_AS_SCODE;
Log(LFATAL, "Unable to memmap framebuffer (%08X)", hr);
Fb_Ptr = NULL;
close(fb_fd);
fb_fd = -1;
return hr;
}
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/* display the splash screen */
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memcpy(Fb_Ptr, _binary_splash_bin_start, (size_t)(&_binary_splash_bin_size));
hr = Config_exitfunc(do_cleanup);
if (FAILED(hr))
do_cleanup();
return hr;
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}
void Fb_clear(void)
{
memset(Fb_Ptr, 0, local_info.screenbytes);
}