From a4534660fecb1b571c24ad82e67bc6c2fb814cb9 Mon Sep 17 00:00:00 2001 From: Danny Holman Date: Sun, 24 Jan 2021 21:10:57 -0600 Subject: x86: reorganize the i386 directory Add structure to the internals of the x86 directory. Signed-off-by: Danny Holman --- arch/i386/boot/tty.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 arch/i386/boot/tty.c (limited to 'arch/i386/boot/tty.c') diff --git a/arch/i386/boot/tty.c b/arch/i386/boot/tty.c new file mode 100644 index 0000000..9c3985b --- /dev/null +++ b/arch/i386/boot/tty.c @@ -0,0 +1,55 @@ +#include "vga.h" +#include +#include +#include +#include + +static const size_t VGA_WIDTH = 80; +static const size_t VGA_HEIGHT = 25; +static uint16_t *const VGA_MEMORY = (uint16_t*)0xB8000; + +static size_t terminal_row; +static size_t terminal_column; +static uint8_t terminal_color; +static uint16_t *terminal_buffer; + +void tty_init(void) { + terminal_row = 0; + terminal_column = 0; + terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK); + terminal_buffer = VGA_MEMORY; + for (size_t y = 0; y < VGA_HEIGHT; y++) { + for (size_t x = 0; x < VGA_WIDTH; x++) { + const size_t index = y * VGA_WIDTH + x; + terminal_buffer[index] = vga_entry(' ', terminal_color); + } + } +} + +void tty_setcolor(uint8_t color) { + terminal_color = color; +} + +void tty_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) { + const size_t index = y * VGA_WIDTH + x; + terminal_buffer[index] = vga_entry(c, color); +} + +void tty_putchar(char c) { + unsigned char uc = c; + tty_putentryat(uc, terminal_color, terminal_column, terminal_row); + if (++terminal_column == VGA_WIDTH) { + terminal_column = 0; + if (++terminal_row == VGA_HEIGHT) + terminal_row = 0; + } +} + +void tty_write(const char *data, size_t size) { + for (size_t i = 0; i < size; i++) + tty_putchar(data[i]); +} + +void tty_writestring(const char *data) { + tty_write(data, strlen(data)); +} -- cgit v1.2.3