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added more documentation

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This commit is contained in:
Amy G. Bowersox
2019-12-07 13:07:59 -07:00
parent fc0c0f05fc
commit 7e098aa63a
15 changed files with 107 additions and 74 deletions
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18
src/fbinit.c
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@@ -16,12 +16,13 @@ extern uint8_t _binary_splash_bin_start[];
extern uint8_t _binary_splash_bin_end;
extern uint8_t _binary_splash_bin_size;
static int fb_fd = -1;
static int fb_fd = -1; /* framebuffer file descriptor */
/* frame buffer information */
static FBINFO local_info;
PCFBINFO Fb_Info = &local_info;
UINT16 *Fb_Ptr = NULL;
UINT16 *Fb_Ptr = NULL; /* pointer to memory-mapped frame buffer */
inline static UINT16 makemask(unsigned offset, unsigned length)
{
@@ -30,12 +31,11 @@ inline static UINT16 makemask(unsigned offset, unsigned length)
static void do_cleanup(void)
{
/* additional cleanup here */
/* black out the display */
memset(Fb_Ptr, 0, local_info.screenbytes);
munmap((void *)Fb_Ptr, local_info.screenbytes);
Fb_Ptr = NULL;
munmap((void *)Fb_Ptr, local_info.screenbytes);
Fb_Ptr = NULL;
close(fb_fd);
fb_fd = -1;
}
@@ -50,10 +50,11 @@ HRESULT Fb_setup(void)
if (fb_fd == -1)
{
hr = ERRNO_AS_SCODE;
Log(LFATAL, "Unable to open framebuffer (%08X)", hr);
Log(LFATAL, "Unable to open framebuffer device %s (%08X)", Gconfig.framebuffer_device, hr);
return hr;
}
/* fixed info is needed to get the memory parameters for the display */
if (ioctl(fb_fd, FBIOGET_FSCREENINFO, &fixed))
{
hr = ERRNO_AS_SCODE;
@@ -64,6 +65,7 @@ HRESULT Fb_setup(void)
local_info.linebytes = fixed.line_length;
local_info.screenbytes = fixed.smem_len;
/* variable info is used to get scren geometry and color info */
if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &var))
{
hr = ERRNO_AS_SCODE;
@@ -100,8 +102,6 @@ HRESULT Fb_setup(void)
/* display the splash screen */
memcpy(Fb_Ptr, _binary_splash_bin_start, (size_t)(&_binary_splash_bin_size));
/* additional setup here */
hr = Config_exitfunc(do_cleanup);
if (FAILED(hr))
do_cleanup();