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/** @file console.c
*
* @brief Console driver implementation.
*
* @author Hanjie Wu (hanjiew)
* @bug No functional bugs
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <x86/asm.h>
#include <x86/video_defines.h>
#include <console.h>
#include <sched.h>
/** index of the register to start displaying cursor */
#define CRTC_CURSOR_START 10
/** bit to start displaying cursor */
#define CURSOR_ENABLE_BIT 0x20
/** pointer to the viedo memory at B800h */
a_char_on_screen_t (*console_mem)[CONSOLE_WIDTH] =
(a_char_on_screen_t(*)[CONSOLE_WIDTH])CONSOLE_MEM_BASE;
/** the char used to produce blank */
#define BLANK_CH ' '
/** initial color of the cursor */
#define DEFAULT_COLOR (FGND_WHITE | BGND_BLACK)
pts_t* active_pts = NULL;
spl_t pts_lock = SPL_INIT;
queue_t* all_pts = NULL;
void pts_init(pts_t* pts) {
pts->cur_x = pts->cur_y = 0;
pts->cur_color = DEFAULT_COLOR;
pts->cur_shown = 1;
pts->lock = MUTEX_INIT;
pts->refcount = 0;
queue_insert_head(&all_pts, &pts->pts_link);
}
/**
* @brief Move the cursor to a position. Position is checked before calling this
* function
* @param x x
* @param y y
*/
static inline void move_cursor(pts_t* pts, int x, int y) {
pts->cur_x = x;
pts->cur_y = y;
int old_if = spl_lock(&pts_lock);
if (active_pts == pts) {
int pos = y * CONSOLE_WIDTH + x;
outb(CRTC_IDX_REG, CRTC_CURSOR_LSB_IDX);
outb(CRTC_DATA_REG, pos & 0xff);
outb(CRTC_IDX_REG, CRTC_CURSOR_MSB_IDX);
outb(CRTC_DATA_REG, pos >> 8);
}
spl_unlock(&pts_lock, old_if);
}
/**
* @brief Scroll the console by one line and clean the last line
*/
static inline void scroll_page(pts_t* pts) {
/* move all but last line forward */
memmove(pts->mem[0], pts->mem[1],
sizeof(a_char_on_screen_t) * CONSOLE_WIDTH * (CONSOLE_HEIGHT - 1));
int i;
for (i = 0; i < CONSOLE_WIDTH; i++) {
pts->mem[CONSOLE_HEIGHT - 1][i] =
(a_char_on_screen_t){BLANK_CH, pts->cur_color};
}
int old_if = spl_lock(&pts_lock);
if (active_pts == pts) {
memmove(
console_mem[0], console_mem[1],
sizeof(a_char_on_screen_t) * CONSOLE_WIDTH * (CONSOLE_HEIGHT - 1));
int i;
for (i = 0; i < CONSOLE_WIDTH; i++) {
console_mem[CONSOLE_HEIGHT - 1][i] =
(a_char_on_screen_t){BLANK_CH, pts->cur_color};
}
}
spl_unlock(&pts_lock, old_if);
}
static inline void draw_char(pts_t* pts,
int row,
int col,
a_char_on_screen_t ch) {
pts->mem[row][col] = ch;
int old_if = spl_lock(&pts_lock);
if (active_pts == pts) {
console_mem[row][col] = ch;
}
spl_unlock(&pts_lock, old_if);
}
int putbyte(char ch) {
return pts_putbyte(get_current()->pts, ch);
}
int pts_putbyte(pts_t* pts, char ch) {
if (ch == '\n') {
if (pts->cur_y < CONSOLE_HEIGHT - 1) {
move_cursor(pts, 0, pts->cur_y + 1);
} else {
scroll_page(pts);
move_cursor(pts, 0, pts->cur_y);
}
return ch;
}
if (ch == '\r') {
move_cursor(pts, 0, pts->cur_y);
return ch;
}
if (ch == '\b') {
if (pts->cur_x > 0) {
move_cursor(pts, pts->cur_x - 1, pts->cur_y);
} else if (pts->cur_y > 0) {
move_cursor(pts, CONSOLE_WIDTH - 1, pts->cur_y - 1);
}
a_char_on_screen_t c = {BLANK_CH, pts->cur_color};
draw_char(pts, pts->cur_y, pts->cur_x, c);
return ch;
}
/* save the position where we should show the char */
int prev_x = pts->cur_x, prev_y = pts->cur_y;
if (pts->cur_x < CONSOLE_WIDTH - 1) {
/* move forward */
move_cursor(pts, pts->cur_x + 1, pts->cur_y);
} else if (pts->cur_y < CONSOLE_HEIGHT - 1) {
/* go to next line */
move_cursor(pts, 0, pts->cur_y + 1);
} else {
/* scroll and go to beginning of the line */
scroll_page(pts);
move_cursor(pts, 0, pts->cur_y);
prev_y -= 1;
}
a_char_on_screen_t c = {ch, pts->cur_color};
draw_char(pts, prev_y, prev_x, c);
return ch;
}
void pts_putbytes(pts_t* pts, const char* s, int len) {
if (s == NULL || len <= 0) {
return;
}
int i;
for (i = 0; i < len; i++) {
pts_putbyte(pts, s[i]);
}
}
int pts_set_term_color(pts_t* pts, int color) {
if (color > 0xff || color < 0) {
return -1;
}
pts->cur_color = (char)color;
return 0;
}
void pts_get_term_color(pts_t* pts, int* color) {
*color = pts->cur_color;
}
int pts_set_cursor(pts_t* pts, int row, int col) {
if (row >= CONSOLE_HEIGHT || row < 0) {
return -1;
}
if (col >= CONSOLE_WIDTH || col < 0) {
return -1;
}
move_cursor(pts, col, row);
return 0;
}
void pts_get_cursor(pts_t* pts, int* row, int* col) {
*row = pts->cur_y;
*col = pts->cur_x;
}
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