diff options
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/arch/i386/core/video_subr.c')
-rw-r--r-- | contrib/syslinux-4.02/gpxe/src/arch/i386/core/video_subr.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/core/video_subr.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/video_subr.c new file mode 100644 index 0000000..c821cd0 --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/video_subr.c @@ -0,0 +1,104 @@ +/* + * + * modified from linuxbios code + * by Cai Qiang <rimy2000@hotmail.com> + * + */ + +#include "stddef.h" +#include "string.h" +#include <gpxe/io.h> +#include "console.h" +#include <gpxe/init.h> +#include "vga.h" + +struct console_driver vga_console; + +static char *vidmem; /* The video buffer */ +static int video_line, video_col; + +#define VIDBUFFER 0xB8000 + +static void memsetw(void *s, int c, unsigned int n) +{ + unsigned int i; + u16 *ss = (u16 *) s; + + for (i = 0; i < n; i++) { + ss[i] = ( u16 ) c; + } +} + +static void video_init(void) +{ + static int inited=0; + + vidmem = (char *)phys_to_virt(VIDBUFFER); + + if (!inited) { + video_line = 0; + video_col = 0; + + memsetw(vidmem, VGA_ATTR_CLR_WHT, 2*1024); // + + inited=1; + } +} + +static void video_scroll(void) +{ + int i; + + memcpy(vidmem, vidmem + COLS * 2, (LINES - 1) * COLS * 2); + for (i = (LINES - 1) * COLS * 2; i < LINES * COLS * 2; i += 2) + vidmem[i] = ' '; +} + +static void vga_putc(int byte) +{ + if (byte == '\n') { + video_line++; + video_col = 0; + + } else if (byte == '\r') { + video_col = 0; + + } else if (byte == '\b') { + video_col--; + + } else if (byte == '\t') { + video_col += 4; + + } else if (byte == '\a') { + //beep + //beep(500); + + } else { + vidmem[((video_col + (video_line *COLS)) * 2)] = byte; + vidmem[((video_col + (video_line *COLS)) * 2) +1] = VGA_ATTR_CLR_WHT; + video_col++; + } + if (video_col < 0) { + video_col = 0; + } + if (video_col >= COLS) { + video_line++; + video_col = 0; + } + if (video_line >= LINES) { + video_scroll(); + video_line--; + } + // move the cursor + write_crtc((video_col + (video_line *COLS)) >> 8, CRTC_CURSOR_HI); + write_crtc((video_col + (video_line *COLS)) & 0x0ff, CRTC_CURSOR_LO); +} + +struct console_driver vga_console __console_driver = { + .putchar = vga_putc, + .disabled = 1, +}; + +struct init_fn video_init_fn __init_fn ( INIT_EARLY ) = { + .initialise = video_init, +}; |