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splash-log: restore vga text output

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This commit is contained in:
K. Lange 2021-06-14 12:14:55 +09:00
parent bb4b0a8ffa
commit f187a5c85f
1 changed files with 50 additions and 10 deletions
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58
apps/splash-log.c
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@ -19,12 +19,16 @@
#include "terminal-font.h"
/**
* Graphical framebuffer is a bit more straightforward.
*/
static void do_nothing() {
/* do nothing */
}
/* Framebuffer setup */
static int framebuffer_fd = -1;
static long width, height, depth;
static char * framebuffer;
static void (*update_message)(char * c, int line) = do_nothing;
static void (*clear_screen)(void) = do_nothing;
static void set_point(int x, int y, uint32_t value) {
uint32_t * disp = (uint32_t *)framebuffer;
@ -53,8 +57,7 @@ static void write_char(int x, int y, int val, uint32_t color) {
}
static unsigned int line_offset = 0;
static void update_message(char * c, int line) {
if (framebuffer_fd < 0) return;
static void fb_update_message(char * c, int line) {
int x = 20;
int y = 20 + line_offset * char_height;
if (line == 0) {
@ -71,9 +74,7 @@ static void update_message(char * c, int line) {
}
}
static void clear_screen(void) {
if (framebuffer_fd < 0) return;
static void fb_clear_screen(void) {
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
set_point(x,y,BG_COLOR);
@ -81,10 +82,49 @@ static void clear_screen(void) {
}
}
static void placech(unsigned char c, int x, int y, int attr) {
unsigned short *where;
unsigned att = attr << 8;
where = (unsigned short*)(framebuffer) + (y * 80 + x);
*where = c | att;
}
static void vga_update_message(char * c, int line) {
int x = 1;
int y = 1 + line_offset;
if (line == 0) {
line_offset++;
}
while (*c) {
placech(*c, x, y, 0x7);
c++;
x++;
}
while (x < 80) {
placech(' ', x, y, 0x7);
x++;
}
}
static void vga_clear_screen(void) {
for (int y = 0; y < 24; ++y) {
for (int x = 0; x < 80; ++x) {
placech(' ', x, y, 0); /* Clear */
}
}
}
static void check_framebuffer(void) {
framebuffer_fd = open("/dev/fb0", O_RDONLY);
if (framebuffer_fd >= 0) {
update_message = fb_update_message;
clear_screen = fb_clear_screen;
} else {
framebuffer_fd = open("/dev/vga0", O_RDONLY);
if (framebuffer_fd < 0) return;
update_message = vga_update_message;
clear_screen = vga_clear_screen;
}
ioctl(framebuffer_fd, IO_VID_WIDTH, &width);
ioctl(framebuffer_fd, IO_VID_HEIGHT, &height);
ioctl(framebuffer_fd, IO_VID_DEPTH, &depth);