From 8ca8d7665d671e10d72b8fcb4d69121d75f7906e Mon Sep 17 00:00:00 2001 From: Eric Biederman Date: Tue, 22 Apr 2003 19:02:15 +0000 Subject: - Initial checkin of the freebios2 tree git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/console/vga_console.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 src/console/vga_console.c (limited to 'src/console/vga_console.c') diff --git a/src/console/vga_console.c b/src/console/vga_console.c new file mode 100644 index 0000000000..ffd6699529 --- /dev/null +++ b/src/console/vga_console.c @@ -0,0 +1,100 @@ +/* + * + * modified from original freebios code + * by Steve M. Gehlbach + * + */ + +#include +#include +#include +#include + +void beep(int ms); + +static char *vidmem; /* The video buffer, should be replaced by symbol in ldscript.ld */ +int vga_line, vga_col; + +#define VIDBUFFER 0xB8000; + +static void memsetw(void *s, int c, unsigned int n) +{ + int i; + u16 *ss = (u16 *) s; + + for (i = 0; i < n; i++) { + ss[i] = ( u16 ) c; + } +} + +static void vga_init(void) +{ + + // these are globals + vga_line = 0; + vga_col = 0; + vidmem = (unsigned char *) VIDBUFFER; + + // mainboard or chip specific init routines + // also loads font + vga_hardware_fixup(); + + // set attributes, char for entire screen + // font should be previously loaded in + // device specific code (vga_hardware_fixup) + memsetw(vidmem, VGA_ATTR_CLR_WHT, 2*1024); // +} + +static void vga_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_tx_byte(unsigned char byte) +{ + if (byte == '\n') { + vga_line++; + vga_col = 0; + + } else if (byte == '\r') { + vga_col = 0; + + } else if (byte == '\b') { + vga_col--; + + } else if (byte == '\t') { + vga_col += 4; + + } else if (byte == '\a') { + //beep + beep(500); + + } else { + vidmem[((vga_col + (vga_line *COLS)) * 2)] = byte; + vidmem[((vga_col + (vga_line *COLS)) * 2) +1] = VGA_ATTR_CLR_WHT; + vga_col++; + } + if (vga_col < 0) { + vga_col = 0; + } + if (vga_col >= COLS) { + vga_line++; + vga_col = 0; + } + if (vga_line >= LINES) { + vga_scroll(); + vga_line--; + } + // move the cursor + write_crtc((vga_col + (vga_line *COLS)) >> 8, CRTC_CURSOR_HI); + write_crtc((vga_col + (vga_line *COLS)) & 0x0ff, CRTC_CURSOR_LO); +} + +struct console_driver { + .init = vga_init, + .tx_byte = vga_tx_byte, +}; -- cgit v1.2.3