+++ /dev/null
-/*
-pcboot - bootable PC demo/game kernel
-Copyright (C) 2018-2023 John Tsiombikas <nuclear@member.fsf.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY, without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <https://www.gnu.org/licenses/>.
-*/
-#include <stdio.h>
-#include <string.h>
-#include <stdarg.h>
-#include "contty.h"
-#include "serial.h"
-#include "asmops.h"
-#include "config.h"
-
-#define VIRT_ROWS 200
-
-#define NCOLS 80
-#define NROWS 25
-#define TEXT_ADDR ((char*)0xb8000)
-
-#define CRTC_ADDR 0x3d4
-#define CRTC_DATA 0x3d5
-
-#define CRTC_REG_CURSTART 0x0a
-#define CRTC_REG_CUREND 0x0b
-#define CRTC_REG_START_H 0x0c
-#define CRTC_REG_START_L 0x0d
-#define CRTC_REG_CURLOC_H 0x0e
-#define CRTC_REG_CURLOC_L 0x0f
-
-#define VMEM_CHAR(c, attr) \
- (((uint16_t)(c) & 0xff) | ((uint16_t)(attr) << 8))
-
-static void scroll(void);
-static void crtc_cursor(int x, int y);
-static void crtc_getcursor(int *x, int *y);
-static void crtc_setstart(int y);
-static int crtc_getstart(void);
-static inline unsigned char crtc_read(int reg);
-static inline void crtc_write(int reg, unsigned char val);
-
-static int cursor_x, cursor_y;
-static unsigned char txattr = 0x07;
-static int start_line;
-static unsigned char cy0, cy1;
-static int curvis;
-static int scr_on = 1;
-
-
-int con_init(void)
-{
-#ifdef CON_SERIAL
- ser_open(1, 9600, SER_8N1);
-#endif
-
-#ifdef CON_TEXTMODE
- cy0 = crtc_read(CRTC_REG_CURSTART);
- curvis = cy0 & 0x20 ? 1 : 0;
- cy0 &= 0x1f;
- cy1 = crtc_read(CRTC_REG_CUREND) & 0x1f;
-
- start_line = crtc_getstart();
- crtc_getcursor(&cursor_x, &cursor_y);
- con_show_cursor(1);
- scr_on = 1;
-#endif
-
- return 0;
-}
-
-void con_scr_enable(void)
-{
- scr_on = 1;
-}
-
-void con_scr_disable(void)
-{
- scr_on = 0;
-}
-
-void con_show_cursor(int show)
-{
-#ifdef CON_TEXTMODE
- unsigned char val = cy0 & 0x1f;
- if(!show) {
- val |= 0x20;
- }
- crtc_write(CRTC_REG_CURSTART, val);
- curvis = show;
-#endif
-}
-
-void con_cursor(int x, int y)
-{
-#ifdef CON_TEXTMODE
- cursor_x = x;
- cursor_y = y;
- crtc_cursor(x, y);
-#endif
-}
-
-void con_curattr(int shape, int blink)
-{
-#ifdef CON_TEXTMODE
- unsigned char start;
- cy0 = (shape == CON_CURSOR_LINE) ? 0xd : 0;
- cy1 = 0xe;
-
- start = cy0;
- if(curvis) {
- start |= 0x20;
- }
-
- crtc_write(CRTC_REG_CURSTART, start);
- crtc_write(CRTC_REG_CUREND, cy0);
-#endif
-}
-
-void con_fgcolor(int c)
-{
- txattr = (txattr & 0xf0) | c;
-}
-
-void con_bgcolor(int c)
-{
- txattr = (txattr & 0x0f) | (c << 4);
-}
-
-void con_setattr(unsigned char attr)
-{
- txattr = attr;
-}
-
-unsigned char con_getattr(void)
-{
- return txattr;
-}
-
-void con_clear(void)
-{
-#ifdef CON_TEXTMODE
- memset16(TEXT_ADDR, VMEM_CHAR(' ', txattr), NCOLS * NROWS);
-
- start_line = 0;
- crtc_setstart(0);
-
- cursor_x = cursor_y = 0;
- crtc_cursor(0, 0);
-#endif
-}
-
-static inline void linefeed(void)
-{
- if(++cursor_y >= NROWS) {
- scroll();
- --cursor_y;
- }
-}
-
-void con_putchar(int c)
-{
-#ifdef CON_TEXTMODE
- if(scr_on) {
- switch(c) {
- case '\n':
- linefeed();
- case '\r':
- cursor_x = 0;
- crtc_cursor(cursor_x, cursor_y);
- break;
-
- case '\t':
- cursor_x = (cursor_x & 0x7) + 8;
- if(cursor_x >= NCOLS) {
- linefeed();
- cursor_x = 0;
- }
- crtc_cursor(cursor_x, cursor_y);
- break;
-
- case '\b':
- if(cursor_x > 0) cursor_x--;
- con_putchar_scr(cursor_x, cursor_y, ' ');
- crtc_cursor(cursor_x, cursor_y);
- break;
-
- default:
- con_putchar_scr(cursor_x, cursor_y, c);
-
- if(++cursor_x >= NCOLS) {
- linefeed();
- cursor_x = 0;
- }
- crtc_cursor(cursor_x, cursor_y);
- }
- }
-#endif
-
-#ifdef CON_SERIAL
- ser_putchar(c);
-#endif
-}
-
-void con_putchar_scr(int x, int y, int c)
-{
-#ifdef CON_TEXTMODE
- uint16_t *ptr = (uint16_t*)TEXT_ADDR;
- ptr[(y + start_line) * NCOLS + x] = VMEM_CHAR(c, txattr);
-#endif
-}
-
-int con_printf(int x, int y, const char *fmt, ...)
-{
-#ifdef CON_TEXTMODE
- va_list ap;
- char buf[81];
- char *ptr = buf;
-
- va_start(ap, fmt);
- vsnprintf(buf, 80, fmt, ap);
- va_end(ap);
-
- while(*ptr && x < 80) {
- con_putchar_scr(x++, y, *ptr++);
- }
- return ptr - buf;
-#else
- return 0;
-#endif
-}
-
-static void scroll(void)
-{
- int new_line;
-
- if(++start_line > VIRT_ROWS - NROWS) {
- /* The bottom of the visible range reached the end of our text buffer.
- * Copy the rest of the lines to the top and reset start_line.
- */
- memcpy(TEXT_ADDR, TEXT_ADDR + start_line * NCOLS, (NROWS - 1) * NCOLS * 2);
- start_line = 0;
- }
-
- /* clear the next line that will be revealed by scrolling */
- new_line = start_line + NROWS - 1;
- memset16(TEXT_ADDR + new_line * NCOLS * 2, VMEM_CHAR(' ', txattr), NCOLS);
- crtc_setstart(start_line);
-}
-
-static void crtc_cursor(int x, int y)
-{
- unsigned int addr;
-
- addr = (y + start_line) * NCOLS + x;
-
- crtc_write(CRTC_REG_CURLOC_L, addr);
- crtc_write(CRTC_REG_CURLOC_H, addr >> 8);
-}
-
-static void crtc_getcursor(int *x, int *y)
-{
- unsigned int addr;
-
- addr = crtc_read(CRTC_REG_CURLOC_L);
- addr |= (unsigned int)crtc_read(CRTC_REG_CURLOC_H) << 8;
-
- *y = addr / NCOLS - start_line;
- *x = addr % NCOLS;
-}
-
-static void crtc_setstart(int y)
-{
- unsigned int addr = y * NCOLS;
-
- crtc_write(CRTC_REG_START_L, addr);
- crtc_write(CRTC_REG_START_H, addr >> 8);
-}
-
-static int crtc_getstart(void)
-{
- unsigned int addr;
-
- addr = crtc_read(CRTC_REG_START_L);
- addr |= (unsigned int)crtc_read(CRTC_REG_START_H) << 8;
-
- return addr / NCOLS;
-}
-
-static inline unsigned char crtc_read(int reg)
-{
- outp(CRTC_ADDR, reg);
- return inp(CRTC_DATA);
-}
-
-static inline void crtc_write(int reg, unsigned char val)
-{
- outp(CRTC_ADDR, reg);
- outp(CRTC_DATA, val);
-}
projects / com32 / blobdiff