mirror of
https://github.com/limine-bootloader/limine
synced 2024-12-11 09:14:38 +03:00
321 lines
8.0 KiB
C
321 lines
8.0 KiB
C
#if bios == 1
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
#include <stdbool.h>
|
|
#include <drivers/vga_textmode.h>
|
|
#include <sys/cpu.h>
|
|
#include <lib/real.h>
|
|
#include <lib/libc.h>
|
|
#include <lib/blib.h>
|
|
#include <lib/term.h>
|
|
#include <mm/pmm.h>
|
|
|
|
#define VIDEO_BOTTOM ((VD_ROWS * VD_COLS) - 1)
|
|
#define VD_COLS (80 * 2)
|
|
#define VD_ROWS 25
|
|
|
|
static volatile uint8_t *video_mem = (uint8_t *)0xb8000;
|
|
|
|
static uint8_t *back_buffer = NULL;
|
|
static uint8_t *front_buffer = NULL;
|
|
|
|
static struct context {
|
|
size_t cursor_offset;
|
|
#define cursor_offset context.cursor_offset
|
|
bool cursor_status;
|
|
#define cursor_status context.cursor_status
|
|
uint8_t text_palette;
|
|
#define text_palette context.text_palette
|
|
bool scroll_enabled;
|
|
#define scroll_enabled context.scroll_enabled
|
|
|
|
uint8_t saved_state_text_palette;
|
|
#define saved_state_text_palette context.saved_state_text_palette
|
|
size_t saved_state_cursor_offset;
|
|
#define saved_state_cursor_offset context.saved_state_cursor_offset
|
|
} context;
|
|
|
|
static size_t old_cursor_offset = 0;
|
|
|
|
static void draw_cursor(void) {
|
|
uint8_t pal = back_buffer[cursor_offset + 1];
|
|
video_mem[cursor_offset + 1] = ((pal & 0xf0) >> 4) | ((pal & 0x0f) << 4);
|
|
}
|
|
|
|
void text_save_state(void) {
|
|
saved_state_text_palette = text_palette;
|
|
saved_state_cursor_offset = cursor_offset;
|
|
}
|
|
|
|
void text_restore_state(void) {
|
|
text_palette = saved_state_text_palette;
|
|
cursor_offset = saved_state_cursor_offset;
|
|
}
|
|
|
|
void text_swap_palette(void) {
|
|
text_palette = (text_palette << 4) | (text_palette >> 4);
|
|
}
|
|
|
|
bool text_scroll_disable(void) {
|
|
bool ret = scroll_enabled;
|
|
scroll_enabled = false;
|
|
return ret;
|
|
}
|
|
|
|
void text_scroll_enable(void) {
|
|
scroll_enabled = true;
|
|
}
|
|
|
|
void text_scroll(void) {
|
|
// move the text up by one row
|
|
for (size_t i = term_context.scroll_top_margin * VD_COLS;
|
|
i < (term_context.scroll_bottom_margin - 1) * VD_COLS; i++) {
|
|
back_buffer[i] = back_buffer[i + VD_COLS];
|
|
}
|
|
// clear the last line of the screen
|
|
for (size_t i = (term_context.scroll_bottom_margin - 1) * VD_COLS;
|
|
i < term_context.scroll_bottom_margin * VD_COLS; i += 2) {
|
|
back_buffer[i] = ' ';
|
|
back_buffer[i + 1] = text_palette;
|
|
}
|
|
}
|
|
|
|
void text_revscroll(void) {
|
|
// move the text up by one row
|
|
for (size_t i = (term_context.scroll_bottom_margin - 1) * VD_COLS - 2; ; i--) {
|
|
back_buffer[i + VD_COLS] = back_buffer[i];
|
|
if (i == term_context.scroll_top_margin * VD_COLS) {
|
|
break;
|
|
}
|
|
}
|
|
// clear the first line of the screen
|
|
for (size_t i = term_context.scroll_top_margin * VD_COLS;
|
|
i < (term_context.scroll_top_margin + 1) * VD_COLS; i += 2) {
|
|
back_buffer[i] = ' ';
|
|
back_buffer[i + 1] = text_palette;
|
|
}
|
|
}
|
|
|
|
void text_clear(bool move) {
|
|
for (size_t i = 0; i < VIDEO_BOTTOM; i += 2) {
|
|
back_buffer[i] = ' ';
|
|
back_buffer[i + 1] = text_palette;
|
|
}
|
|
if (move)
|
|
cursor_offset = 0;
|
|
}
|
|
|
|
void text_enable_cursor(void) {
|
|
cursor_status = true;
|
|
}
|
|
|
|
bool text_disable_cursor(void) {
|
|
bool ret = cursor_status;
|
|
cursor_status = false;
|
|
return ret;
|
|
}
|
|
|
|
uint64_t text_context_size(void) {
|
|
uint64_t ret = 0;
|
|
|
|
ret += sizeof(struct context);
|
|
ret += VD_ROWS * VD_COLS; // front buffer
|
|
|
|
return ret;
|
|
}
|
|
|
|
void text_context_save(uint64_t ptr) {
|
|
memcpy32to64(ptr, (uint64_t)(uintptr_t)&context, sizeof(struct context));
|
|
ptr += sizeof(struct context);
|
|
|
|
memcpy32to64(ptr, (uint64_t)(uintptr_t)front_buffer, VD_ROWS * VD_COLS);
|
|
}
|
|
|
|
void text_context_restore(uint64_t ptr) {
|
|
memcpy32to64((uint64_t)(uintptr_t)&context, ptr, sizeof(struct context));
|
|
ptr += sizeof(struct context);
|
|
|
|
memcpy32to64((uint64_t)(uintptr_t)front_buffer, ptr, VD_ROWS * VD_COLS);
|
|
|
|
for (size_t i = 0; i < VD_ROWS * VD_COLS; i++) {
|
|
video_mem[i] = front_buffer[i];
|
|
back_buffer[i] = front_buffer[i];
|
|
}
|
|
|
|
if (cursor_status) {
|
|
draw_cursor();
|
|
old_cursor_offset = cursor_offset;
|
|
}
|
|
}
|
|
|
|
void text_full_refresh(void) {
|
|
for (size_t i = 0; i < VD_ROWS * VD_COLS; i++) {
|
|
video_mem[i] = front_buffer[i];
|
|
back_buffer[i] = front_buffer[i];
|
|
}
|
|
|
|
if (cursor_status) {
|
|
draw_cursor();
|
|
old_cursor_offset = cursor_offset;
|
|
}
|
|
}
|
|
|
|
void init_vga_textmode(size_t *_rows, size_t *_cols, bool managed) {
|
|
if (current_video_mode != -1) {
|
|
struct rm_regs r = {0};
|
|
r.eax = 0x0003;
|
|
rm_int(0x10, &r, &r);
|
|
|
|
current_video_mode = -1;
|
|
}
|
|
|
|
if (back_buffer == NULL) {
|
|
back_buffer = ext_mem_alloc(VD_ROWS * VD_COLS);
|
|
} else {
|
|
memset(back_buffer, 0, VD_ROWS * VD_COLS);
|
|
}
|
|
if (front_buffer == NULL) {
|
|
front_buffer = ext_mem_alloc(VD_ROWS * VD_COLS);
|
|
} else {
|
|
memset(front_buffer, 0, VD_ROWS * VD_COLS);
|
|
}
|
|
|
|
cursor_offset = 0;
|
|
cursor_status = true;
|
|
text_palette = 0x07;
|
|
scroll_enabled = true;
|
|
|
|
text_clear(false);
|
|
|
|
*_rows = VD_ROWS;
|
|
*_cols = VD_COLS / 2;
|
|
|
|
// VGA cursor code taken from: https://wiki.osdev.org/Text_Mode_Cursor
|
|
|
|
if (!managed) {
|
|
text_disable_cursor();
|
|
|
|
outb(0x3d4, 0x0a);
|
|
outb(0x3d5, (inb(0x3d5) & 0xc0) | 14);
|
|
outb(0x3d4, 0x0b);
|
|
outb(0x3d5, (inb(0x3d5) & 0xe0) | 15);
|
|
outb(0x3d4, 0x0f);
|
|
outb(0x3d5, 0);
|
|
outb(0x3d4, 0x0e);
|
|
outb(0x3d5, 0);
|
|
|
|
struct rm_regs r = {0};
|
|
r.eax = 0x0200;
|
|
rm_int(0x10, &r, &r);
|
|
} else {
|
|
outb(0x3d4, 0x0a);
|
|
outb(0x3d5, 0x20);
|
|
}
|
|
|
|
text_double_buffer_flush();
|
|
}
|
|
|
|
void text_double_buffer_flush(void) {
|
|
if (cursor_status) {
|
|
draw_cursor();
|
|
}
|
|
|
|
if (cursor_offset != old_cursor_offset || cursor_status == false) {
|
|
video_mem[old_cursor_offset + 1] = back_buffer[old_cursor_offset + 1];
|
|
}
|
|
|
|
for (size_t i = 0; i < VD_ROWS * VD_COLS; i++) {
|
|
if (back_buffer[i] == front_buffer[i]) {
|
|
continue;
|
|
}
|
|
|
|
if (cursor_status && i == cursor_offset + 1) {
|
|
continue;
|
|
}
|
|
|
|
front_buffer[i] = back_buffer[i];
|
|
video_mem[i] = back_buffer[i];
|
|
}
|
|
|
|
if (cursor_status) {
|
|
old_cursor_offset = cursor_offset;
|
|
}
|
|
}
|
|
|
|
void text_get_cursor_pos(size_t *x, size_t *y) {
|
|
*x = (cursor_offset % VD_COLS) / 2;
|
|
*y = cursor_offset / VD_COLS;
|
|
}
|
|
|
|
void text_move_character(size_t new_x, size_t new_y, size_t old_x, size_t old_y) {
|
|
if (old_x >= VD_COLS / 2 || old_y >= VD_ROWS
|
|
|| new_x >= VD_COLS / 2 || new_y >= VD_ROWS) {
|
|
return;
|
|
}
|
|
|
|
back_buffer[new_y * VD_COLS + new_x * 2] = back_buffer[old_y * VD_COLS + old_x * 2];
|
|
}
|
|
|
|
void text_set_cursor_pos(size_t x, size_t y) {
|
|
if (x >= VD_COLS / 2) {
|
|
if ((int)x < 0) {
|
|
x = 0;
|
|
} else {
|
|
x = VD_COLS / 2 - 1;
|
|
}
|
|
}
|
|
if (y >= VD_ROWS) {
|
|
if ((int)y < 0) {
|
|
y = 0;
|
|
} else {
|
|
y = VD_ROWS - 1;
|
|
}
|
|
}
|
|
cursor_offset = y * VD_COLS + x * 2;
|
|
}
|
|
|
|
static uint8_t ansi_colours[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
|
|
|
|
void text_set_text_fg(size_t fg) {
|
|
text_palette = (text_palette & 0xf0) | ansi_colours[fg];
|
|
}
|
|
|
|
void text_set_text_bg(size_t bg) {
|
|
text_palette = (text_palette & 0x0f) | (ansi_colours[bg] << 4);
|
|
}
|
|
|
|
void text_set_text_fg_bright(size_t fg) {
|
|
text_palette = (text_palette & 0xf0) | (ansi_colours[fg] | (1 << 3));
|
|
}
|
|
|
|
void text_set_text_bg_bright(size_t bg) {
|
|
text_palette = (text_palette & 0x0f) | ((ansi_colours[bg] | (1 << 3)) << 4);
|
|
}
|
|
|
|
void text_set_text_fg_default(void) {
|
|
text_palette = (text_palette & 0xf0) | 7;
|
|
}
|
|
|
|
void text_set_text_bg_default(void) {
|
|
text_palette &= 0x0f;
|
|
}
|
|
|
|
void text_putchar(uint8_t c) {
|
|
back_buffer[cursor_offset] = c;
|
|
back_buffer[cursor_offset + 1] = text_palette;
|
|
if (cursor_offset / VD_COLS == term_context.scroll_bottom_margin - 1
|
|
&& cursor_offset % VD_COLS == VD_COLS - 2) {
|
|
if (scroll_enabled) {
|
|
text_scroll();
|
|
cursor_offset -= cursor_offset % VD_COLS;
|
|
}
|
|
} else if (cursor_offset >= (VIDEO_BOTTOM - 1)) {
|
|
cursor_offset -= cursor_offset % VD_COLS;
|
|
} else {
|
|
cursor_offset += 2;
|
|
}
|
|
}
|
|
|
|
#endif
|