361 lines
11 KiB
C
361 lines
11 KiB
C
#if defined (BIOS)
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <drivers/vga_textmode.h>
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#include <sys/cpu.h>
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#include <lib/real.h>
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#include <lib/libc.h>
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#include <lib/misc.h>
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#include <lib/term.h>
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#include <mm/pmm.h>
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#define VIDEO_BOTTOM ((VD_ROWS * VD_COLS) - 1)
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static void draw_cursor(struct textmode_context *ctx) {
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uint8_t pal = ctx->back_buffer[ctx->cursor_offset + 1];
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ctx->video_mem[ctx->cursor_offset + 1] = ((pal & 0xf0) >> 4) | ((pal & 0x0f) << 4);
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}
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static void text_save_state(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->saved_state_text_palette = ctx->text_palette;
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ctx->saved_state_cursor_offset = ctx->cursor_offset;
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}
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static void text_restore_state(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = ctx->saved_state_text_palette;
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ctx->cursor_offset = ctx->saved_state_cursor_offset;
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}
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static void text_swap_palette(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette << 4) | (ctx->text_palette >> 4);
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}
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static void text_scroll(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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// move the text up by one row
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for (size_t i = _ctx->scroll_top_margin * VD_COLS;
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i < (_ctx->scroll_bottom_margin - 1) * VD_COLS; i++) {
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ctx->back_buffer[i] = ctx->back_buffer[i + VD_COLS];
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}
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// clear the last line of the screen
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for (size_t i = (_ctx->scroll_bottom_margin - 1) * VD_COLS;
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i < _ctx->scroll_bottom_margin * VD_COLS; i += 2) {
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ctx->back_buffer[i] = ' ';
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ctx->back_buffer[i + 1] = ctx->text_palette;
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}
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}
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static void text_revscroll(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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// move the text up by one row
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for (size_t i = (_ctx->scroll_bottom_margin - 1) * VD_COLS - 2; ; i--) {
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ctx->back_buffer[i + VD_COLS] = ctx->back_buffer[i];
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if (i == _ctx->scroll_top_margin * VD_COLS) {
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break;
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}
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}
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// clear the first line of the screen
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for (size_t i = _ctx->scroll_top_margin * VD_COLS;
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i < (_ctx->scroll_top_margin + 1) * VD_COLS; i += 2) {
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ctx->back_buffer[i] = ' ';
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ctx->back_buffer[i + 1] = ctx->text_palette;
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}
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}
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static void text_clear(struct flanterm_context *_ctx, bool move) {
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struct textmode_context *ctx = (void *)_ctx;
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for (size_t i = 0; i < VIDEO_BOTTOM; i += 2) {
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ctx->back_buffer[i] = ' ';
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ctx->back_buffer[i + 1] = ctx->text_palette;
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}
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if (move) {
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ctx->cursor_offset = 0;
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}
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}
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static void text_full_refresh(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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for (size_t i = 0; i < VD_ROWS * VD_COLS; i++) {
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ctx->video_mem[i] = ctx->front_buffer[i];
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ctx->back_buffer[i] = ctx->front_buffer[i];
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}
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if (_ctx->cursor_enabled) {
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draw_cursor(ctx);
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ctx->old_cursor_offset = ctx->cursor_offset;
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}
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}
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static void text_double_buffer_flush(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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if (_ctx->cursor_enabled) {
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draw_cursor(ctx);
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}
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if (ctx->cursor_offset != ctx->old_cursor_offset || _ctx->cursor_enabled == false) {
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ctx->video_mem[ctx->old_cursor_offset + 1] = ctx->back_buffer[ctx->old_cursor_offset + 1];
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}
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for (size_t i = 0; i < VD_ROWS * VD_COLS; i++) {
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if (ctx->back_buffer[i] == ctx->front_buffer[i]) {
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continue;
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}
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ctx->front_buffer[i] = ctx->back_buffer[i];
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if (_ctx->cursor_enabled && i == ctx->cursor_offset + 1) {
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continue;
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}
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ctx->video_mem[i] = ctx->back_buffer[i];
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}
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if (_ctx->cursor_enabled) {
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ctx->old_cursor_offset = ctx->cursor_offset;
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}
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}
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static void text_get_cursor_pos(struct flanterm_context *_ctx, size_t *x, size_t *y) {
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struct textmode_context *ctx = (void *)_ctx;
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*x = (ctx->cursor_offset % VD_COLS) / 2;
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*y = ctx->cursor_offset / VD_COLS;
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}
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static void text_move_character(struct flanterm_context *_ctx, size_t new_x, size_t new_y, size_t old_x, size_t old_y) {
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struct textmode_context *ctx = (void *)_ctx;
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if (old_x >= VD_COLS / 2 || old_y >= VD_ROWS
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|| new_x >= VD_COLS / 2 || new_y >= VD_ROWS) {
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return;
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}
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ctx->back_buffer[new_y * VD_COLS + new_x * 2] = ctx->back_buffer[old_y * VD_COLS + old_x * 2];
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}
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static void text_set_cursor_pos(struct flanterm_context *_ctx, size_t x, size_t y) {
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struct textmode_context *ctx = (void *)_ctx;
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if (x >= VD_COLS / 2) {
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if ((int)x < 0) {
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x = 0;
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} else {
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x = VD_COLS / 2 - 1;
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}
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}
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if (y >= VD_ROWS) {
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if ((int)y < 0) {
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y = 0;
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} else {
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y = VD_ROWS - 1;
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}
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}
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ctx->cursor_offset = y * VD_COLS + x * 2;
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}
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static uint8_t ansi_colours[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
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static void text_set_text_fg(struct flanterm_context *_ctx, size_t fg) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0xf0) | ansi_colours[fg];
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}
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static void text_set_text_bg(struct flanterm_context *_ctx, size_t bg) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0x0f) | (ansi_colours[bg] << 4);
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}
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static void text_set_text_fg_bright(struct flanterm_context *_ctx, size_t fg) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0xf0) | (ansi_colours[fg] | (1 << 3));
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}
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static void text_set_text_bg_bright(struct flanterm_context *_ctx, size_t bg) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0x0f) | ((ansi_colours[bg] | (1 << 3)) << 4);
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}
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static void text_set_text_fg_rgb(struct flanterm_context *ctx, uint32_t n) {
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(void)ctx;
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(void)n;
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}
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static void text_set_text_bg_rgb(struct flanterm_context *ctx, uint32_t n) {
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(void)ctx;
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(void)n;
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}
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static void text_set_text_fg_default(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0xf0) | 7;
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}
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static void text_set_text_bg_default(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette &= 0x0f;
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}
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static void text_set_text_fg_default_bright(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0xf0) | (7 | (1 << 3));
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}
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static void text_set_text_bg_default_bright(struct flanterm_context *_ctx) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->text_palette = (ctx->text_palette & 0x0f) | ((1 << 3) << 4);
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}
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static void text_putchar(struct flanterm_context *_ctx, uint8_t c) {
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struct textmode_context *ctx = (void *)_ctx;
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ctx->back_buffer[ctx->cursor_offset] = c;
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ctx->back_buffer[ctx->cursor_offset + 1] = ctx->text_palette;
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if (ctx->cursor_offset / VD_COLS == _ctx->scroll_bottom_margin - 1
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&& ctx->cursor_offset % VD_COLS == VD_COLS - 2) {
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if (_ctx->scroll_enabled) {
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text_scroll(_ctx);
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ctx->cursor_offset -= ctx->cursor_offset % VD_COLS;
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}
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} else if (ctx->cursor_offset >= (VIDEO_BOTTOM - 1)) {
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ctx->cursor_offset -= ctx->cursor_offset % VD_COLS;
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} else {
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ctx->cursor_offset += 2;
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}
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}
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static void text_deinit(struct flanterm_context *_ctx, void (*_free)(void *, size_t)) {
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struct textmode_context *ctx = (void *)_ctx;
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if (ctx->back_buffer != NULL) {
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_free(ctx->back_buffer, VD_ROWS * VD_COLS);
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ctx->back_buffer = NULL;
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}
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if (ctx->front_buffer != NULL) {
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_free(ctx->front_buffer, VD_ROWS * VD_COLS);
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ctx->front_buffer = NULL;
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}
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pmm_free(ctx, sizeof(struct textmode_context));
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}
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void vga_textmode_init(bool managed) {
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term_notready();
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if (quiet) {
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return;
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}
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if (current_video_mode != 0x3) {
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struct rm_regs r = {0};
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r.eax = 0x0003;
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rm_int(0x10, &r, &r);
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current_video_mode = 0x3;
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}
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terms = ext_mem_alloc(sizeof(void *));
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terms_i = 1;
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terms[0] = ext_mem_alloc(sizeof(struct textmode_context));
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struct flanterm_context *term = terms[0];
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struct textmode_context *ctx = (void *)term;
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if (ctx->back_buffer == NULL) {
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ctx->back_buffer = ext_mem_alloc(VD_ROWS * VD_COLS);
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} else {
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memset(ctx->back_buffer, 0, VD_ROWS * VD_COLS);
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}
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if (ctx->front_buffer == NULL) {
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ctx->front_buffer = ext_mem_alloc(VD_ROWS * VD_COLS);
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} else {
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memset(ctx->front_buffer, 0, VD_ROWS * VD_COLS);
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}
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ctx->cursor_offset = 0;
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ctx->text_palette = 0x07;
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ctx->video_mem = (volatile uint8_t *)0xb8000;
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text_clear(term, false);
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// VGA cursor code taken from: https://wiki.osdev.org/Text_Mode_Cursor
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if (!managed) {
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term->cursor_enabled = false;
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outb(0x3d4, 0x0a);
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outb(0x3d5, (inb(0x3d5) & 0xc0) | 14);
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outb(0x3d4, 0x0b);
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outb(0x3d5, (inb(0x3d5) & 0xe0) | 15);
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outb(0x3d4, 0x0f);
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outb(0x3d5, 0);
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outb(0x3d4, 0x0e);
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outb(0x3d5, 0);
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struct rm_regs r = {0};
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r.eax = 0x0200;
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rm_int(0x10, &r, &r);
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} else {
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outb(0x3d4, 0x0a);
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outb(0x3d5, 0x20);
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}
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text_double_buffer_flush(term);
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if (managed && serial) {
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term->cols = 80;
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term->rows = 24;
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} else {
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term->cols = 80;
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term->rows = 25;
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}
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term->raw_putchar = text_putchar;
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term->clear = text_clear;
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term->set_cursor_pos = text_set_cursor_pos;
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term->get_cursor_pos = text_get_cursor_pos;
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term->set_text_fg = text_set_text_fg;
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term->set_text_bg = text_set_text_bg;
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term->set_text_fg_bright = text_set_text_fg_bright;
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term->set_text_bg_bright = text_set_text_bg_bright;
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term->set_text_fg_rgb = text_set_text_fg_rgb;
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term->set_text_bg_rgb = text_set_text_bg_rgb;
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term->set_text_fg_default = text_set_text_fg_default;
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term->set_text_bg_default = text_set_text_bg_default;
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term->set_text_fg_default_bright = text_set_text_fg_default_bright;
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term->set_text_bg_default_bright = text_set_text_bg_default_bright;
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term->move_character = text_move_character;
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term->scroll = text_scroll;
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term->revscroll = text_revscroll;
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term->swap_palette = text_swap_palette;
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term->save_state = text_save_state;
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term->restore_state = text_restore_state;
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term->double_buffer_flush = text_double_buffer_flush;
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term->full_refresh = text_full_refresh;
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term->deinit = text_deinit;
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flanterm_context_reinit(term);
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if (!managed) {
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term->cursor_enabled = false;
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}
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term->full_refresh(term);
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term_backend = TEXTMODE;
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}
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#endif
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