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author | Robin Krahl <robin.krahl@ireas.org> | 2017-03-05 21:43:19 +0100 |
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committer | Robin Krahl <robin.krahl@ireas.org> | 2017-03-05 21:43:19 +0100 |
commit | d42b629d983de336ddd3c22782caa2791ab78897 (patch) | |
tree | ac3a3052c154ca88803df5754eb6c8459e246b2f /core/vga.c | |
download | garmos-d42b629d983de336ddd3c22782caa2791ab78897.tar.gz garmos-d42b629d983de336ddd3c22782caa2791ab78897.tar.bz2 |
initial commit
Diffstat (limited to 'core/vga.c')
-rw-r--r-- | core/vga.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/core/vga.c b/core/vga.c new file mode 100644 index 0000000..fc1982c --- /dev/null +++ b/core/vga.c @@ -0,0 +1,60 @@ +/* + * Copyright (C) 2017 Robin Krahl <robin.krahl@ireas.org> + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation, either version 3 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <garmos/arch.h> +#include <garmos/types.h> +#include <garmos/vga.h> + +#ifndef VGA_MEMORY +#define VGA_MEMORY 0xB8000 +#endif + +void vga_clear(void) +{ + uint32_t i; + + for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2) + regset8(VGA_MEMORY + i, 0); +} + +void vga_pclear(uint8_t attr) +{ + uint32_t i; + + for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2) { + regset8(VGA_MEMORY + i, 0); + regset8(VGA_MEMORY + i + 1, attr); + } +} + +void vga_print(uint32_t row, uint32_t col, uint8_t c) +{ + uint32_t i = 2 * (row * VGA_COLS + col); + + if (row >= VGA_ROWS || col >= VGA_COLS) + return; + + regset8(VGA_MEMORY + i, c); +} + +void vga_pprint(uint32_t row, uint32_t col, uint8_t attr, uint8_t c) +{ + uint32_t i = 2 * (row * VGA_COLS + col); + + if (row >= VGA_ROWS || col >= VGA_COLS) + return; + + regset8(VGA_MEMORY + i, c); + regset8(VGA_MEMORY + i + 1, attr); +} |