86 lines
3.7 KiB
C
86 lines
3.7 KiB
C
#include "vga_text.h"
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#include "../interrupts/multiprocessing.h"
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#include "../lib/lib.h"
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/* void vga_text_set_color(uint8_t x, uint8_t y, uint8_t foreground, uint8_t background)
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* @input: x, y - coordinate of character whose color to be changed.
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* foreground - foreground color to be changed, using VGA text mode palette.
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* background - background color to be changed, using VGA text mode palette.
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* @output: the character at (x, y) has color changed to *foreground* and *background*
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* @description: change the color of character at (x, y) in VGA text mode.
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* Initially used to draw Aqua on exception screen, but can be used for others.
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*/
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void vga_text_set_color(uint8_t x, uint8_t y, uint8_t foreground, uint8_t background) {
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uint8_t color = (background & 0xF) << 4 | (foreground & 0xF);
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*(uint8_t*) (VIDEO + (y * SCREEN_WIDTH + x) * 2 + 1) = color;
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}
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/* void vga_text_set_character(uint8_t x, uint8_t y, uint8_t ch)
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* @input: x, y - coordinate of character whose color to be changed.
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* ch - character to be set at (x, y).
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* @output: the character at (x, y) is changed to *ch*
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* @description: change the character at (x, y) in VGA text mode.
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* Initially used to draw Aqua on exception screen, but can be used for others.
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*/
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void vga_text_set_character(uint8_t x, uint8_t y, uint8_t ch) {
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*(uint8_t*) (VIDEO + (y * SCREEN_WIDTH + x) * 2) = ch;
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}
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/* void vga_text_disable_cursor()
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* @output: the cursor on VGA text mode is no longer there
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* @description: disable the blinking cursor.
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*/
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void vga_text_disable_cursor() {
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if(active_terminal_id != displayed_terminal_id) return;
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// cli();
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// Read the value set at VGA's cursor start register,
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// by first sending an index and then reading the data port
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outb(VGA_REG_CURSOR_START, VGA_PORT_INDEX);
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char data = inb(VGA_PORT_DATA);
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// Replace the value of cursor start register with bit 5 set,
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// here bit 5 is the Cursor Disable field, and value of 1 means
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// the VGA text mode cursor is disabled
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outb(VGA_REG_CURSOR_START, VGA_PORT_INDEX);
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outb(0x20 | data, VGA_PORT_DATA);
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// sti();
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}
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/* void vga_text_enable_cursor()
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* @output: the cursor on VGA text mode appears again
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* @description: enable the blinking cursor.
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*/
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void vga_text_enable_cursor() {
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if(active_terminal_id != displayed_terminal_id) return;
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// cli();
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// Read the value set at VGA's cursor start register,
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// by first sending an index and then reading the data port
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outb(VGA_REG_CURSOR_START, VGA_PORT_INDEX);
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char data = inb(VGA_PORT_DATA);
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// Replace the value of cursor start register with bit 5 cleared,
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// here bit 5 is the Cursor Disable field, and value of 0 means
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// the VGA text mode cursor is enabled
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outb(VGA_REG_CURSOR_START, VGA_PORT_INDEX);
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outb(0xdf & data, VGA_PORT_DATA);
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// sti();
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}
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/* void vga_text_set_cursor_pos(uint8_t x, uint8_t y)
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* @output: the cursor on VGA text mode changes to (x, y)
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* @description: set the position of the blinking cursor.
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*/
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void vga_text_set_cursor_pos(uint8_t x, uint8_t y) {
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if(active_terminal_id != displayed_terminal_id) return;
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// cli();
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// Calculate the character position on VGA plane, row major order
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uint16_t char_pos = (y * SCREEN_WIDTH + x) % (SCREEN_WIDTH * SCREEN_HEIGHT);
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// Replace the value of VGA Cursor Location High Register with high 8 bits
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// of the calculated position
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outb(VGA_REG_CURSOR_LOCATION_HIGH, VGA_PORT_INDEX);
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outb((uint8_t) (char_pos >> 8), VGA_PORT_DATA);
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// Replace the value of VGA Cursor Location Low Register with low 8 bits
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// of the calculated position
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outb(VGA_REG_CURSOR_LOCATION_LOW, VGA_PORT_INDEX);
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outb((uint8_t) char_pos, VGA_PORT_DATA);
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// sti();
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}
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