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path: root/payloads/libpayload/drivers/vga.c
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Diffstat (limited to 'payloads/libpayload/drivers/vga.c')
-rw-r--r--payloads/libpayload/drivers/vga.c62
1 files changed, 29 insertions, 33 deletions
diff --git a/payloads/libpayload/drivers/vga.c b/payloads/libpayload/drivers/vga.c
index 5e0e406f27..fd1dd35abb 100644
--- a/payloads/libpayload/drivers/vga.c
+++ b/payloads/libpayload/drivers/vga.c
@@ -38,8 +38,8 @@
#define CRTC_INDEX 0x3d4
#define CRTC_DATA 0x3d5
-#define VIDEO(_r, _c)\
- ((uint16_t *) (0xB8000 + ((_r) * (WIDTH * 2)) + ((_c) * 2)))
+#define VIDEO(_r, _c) \
+ ((uint16_t *) (0xB8000 + ((_r) * (WIDTH * 2)) + ((_c) * 2)))
static int cursor_enabled;
static int cursorx;
@@ -49,24 +49,25 @@ static void vga_scroll_up(void);
static inline uint8_t crtc_read(uint8_t index)
{
- outb(index, CRTC_INDEX);
- return inb(CRTC_DATA);
+ outb(index, CRTC_INDEX);
+ return inb(CRTC_DATA);
}
static inline void crtc_write(uint8_t data, uint8_t index)
{
- outb(index, CRTC_INDEX);
- outb(data, CRTC_DATA);
+ outb(index, CRTC_INDEX);
+ outb(data, CRTC_DATA);
}
static void vga_get_cursor_pos(void)
{
unsigned int addr;
- addr = ((unsigned int) crtc_read(0x0E)) << 8;
+
+ addr = ((unsigned int)crtc_read(0x0E)) << 8;
addr += crtc_read(0x0E);
cursorx = addr % WIDTH;
- cursory = addr / WIDTH;
+ cursory = addr / WIDTH;
}
static void vga_fixup_cursor(void)
@@ -78,16 +79,16 @@ static void vga_fixup_cursor(void)
if (cursorx < 0)
cursorx = 0;
-
+
if (cursory < 0)
cursory = 0;
-
+
if (cursorx >= WIDTH) {
cursorx = 0;
cursory++;
}
- while(cursory >= HEIGHT)
+ while (cursory >= HEIGHT)
vga_scroll_up();
addr = cursorx + (WIDTH * cursory);
@@ -102,8 +103,7 @@ void vga_cursor_enable(int state)
if (state == 0) {
tmp |= (1 << 5);
cursor_enabled = 0;
- }
- else {
+ } else {
tmp &= ~(1 << 5);
cursor_enabled = 1;
vga_fixup_cursor();
@@ -117,19 +117,19 @@ void vga_clear_line(uint8_t row, uint8_t ch, uint8_t attr)
int col;
uint16_t *ptr = VIDEO(0, row);
- for(col = 0; col < WIDTH; col++)
+ for (col = 0; col < WIDTH; col++)
ptr[col] = ((attr & 0xFF) << 8) | (ch & 0xFF);
}
-
+
static void vga_scroll_up(void)
{
- uint16_t *src = VIDEO(0,1);
- uint16_t *dst = VIDEO(0,0);
+ uint16_t *src = VIDEO(0, 1);
+ uint16_t *dst = VIDEO(0, 0);
int i;
- for(i = 0; i < (HEIGHT - 1) * WIDTH; i++)
+ for (i = 0; i < (HEIGHT - 1) * WIDTH; i++)
*dst++ = *src++;
-
+
vga_clear_line(HEIGHT - 1, ' ', VGA_COLOR_WHITE);
cursory--;
}
@@ -137,7 +137,7 @@ static void vga_scroll_up(void)
void vga_fill(uint8_t ch, uint8_t attr)
{
uint8_t row;
- for(row = 0; row < HEIGHT; row++)
+ for (row = 0; row < HEIGHT; row++)
vga_clear_line(row, ch, attr);
}
@@ -153,11 +153,12 @@ void vga_putc(uint8_t row, uint8_t col, unsigned int c)
*ptr = (uint16_t) (c & 0xFFFF);
}
-void vga_putchar(unsigned int ch) {
-
+void vga_putchar(unsigned int ch)
+{
+
uint16_t *ptr;
- switch(ch & 0xFF) {
+ switch (ch & 0xFF) {
case '\r':
cursorx = 0;
break;
@@ -187,30 +188,25 @@ int vga_move_cursor(int x, int y)
{
cursorx = x;
cursory = y;
-
+
vga_fixup_cursor();
}
void vga_init(void)
{
- /* Get the position of the cursor */
+ /* Get the position of the cursor. */
vga_get_cursor_pos();
- /* See if it us currently enabled or not */
+ /* See if it currently enabled or not. */
cursor_enabled = !(crtc_read(0x0A) & (1 << 5));
- /* If the cursor is enabled, get us to a sane point */
-
+ /* If the cursor is enabled, get us to a sane point. */
if (cursor_enabled) {
-
- /* Go to the next line */
-
+ /* Go to the next line. */
if (cursorx) {
cursorx = 0;
cursory++;
}
-
vga_fixup_cursor();
}
}
-