minix/kernel/arch/i386/direct_tty_utils.c

   1
   2 #include <minix/minlib.h>
   3 #include <minix/cpufeature.h>
   4 #include <machine/partition.h>
   5 #include "string.h"
   6 #include "direct_utils.h"
   7 #include "serial.h"
   8 #include "glo.h"
   9
  10 /* Give non-zero values to avoid them in BSS */
  11 static int print_line = 1, print_col = 1;
  12
  13 #include <sys/video.h>
  14
  15 extern char *video_mem;
  16 #define VIDOFFSET(line, col) ((line) * MULTIBOOT_CONSOLE_COLS * 2 + (col) * 2)
  17 #define VIDSIZE VIDOFFSET(MULTIBOOT_CONSOLE_LINES-1,MULTIBOOT_CONSOLE_COLS-1)
  18
  19 void direct_put_char(char c, int line, int col)
  20 {
  21         int offset = VIDOFFSET(line, col);
  22         video_mem[offset] = c;
  23         video_mem[offset+1] = 0x07;     /* grey-on-black */
  24 }
  25
  26 static char direct_get_char(int line, int col)
  27 {
  28         return video_mem[VIDOFFSET(line, col)];
  29 }
  30
  31 void direct_cls(void)
  32 {
  33         /* Clear screen */
  34         int i,j;
  35
  36         for(i = 0; i < MULTIBOOT_CONSOLE_COLS; i++)
  37                 for(j = 0; j < MULTIBOOT_CONSOLE_LINES; j++)
  38                         direct_put_char(' ', j, i);
  39
  40         print_line = print_col = 0;
  41
  42         /* Tell video hardware origin is 0. */
  43         outb(C_6845+INDEX, VID_ORG);
  44         outb(C_6845+DATA, 0);
  45         outb(C_6845+INDEX, VID_ORG+1);
  46         outb(C_6845+DATA, 0);
  47 }
  48
  49 static void direct_scroll_up(int lines)
  50 {
  51         int i, j;
  52         for (i = 0; i < MULTIBOOT_CONSOLE_LINES; i++ ) {
  53                 for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ ) {
  54                         char c = 0;
  55                         if(i < MULTIBOOT_CONSOLE_LINES-lines)
  56                                 c = direct_get_char(i + lines, j);
  57                         direct_put_char(c, i, j);
  58                 }
  59         }
  60         print_line-= lines;
  61 }
  62
  63 void direct_print_char(char c)
  64 {
  65         while (print_line >= MULTIBOOT_CONSOLE_LINES)
  66                 direct_scroll_up(1);
  67
  68 #define TABWIDTH 8
  69         if(c == '\t') {
  70                 if(print_col >= MULTIBOOT_CONSOLE_COLS - TABWIDTH) {
  71                         c = '\n';
  72                 } else {
  73                         do {
  74                                 direct_put_char(' ', print_line, print_col++);
  75                         } while(print_col % TABWIDTH);
  76                         return;
  77                 }
  78         }
  79
  80         if (c == '\n') {
  81                 while (print_col < MULTIBOOT_CONSOLE_COLS)
  82                         direct_put_char(' ', print_line, print_col++);
  83                 print_line++;
  84                 print_col = 0;
  85                 return;
  86         }
  87
  88         direct_put_char(c, print_line, print_col++);
  89
  90         if (print_col >= MULTIBOOT_CONSOLE_COLS) {
  91                 print_line++;
  92                 print_col = 0;
  93         }
  94
  95         while (print_line >= MULTIBOOT_CONSOLE_LINES)
  96                 direct_scroll_up(1);
  97 }
  98
  99 void direct_print(const char *str)
 100 {
 101         while (*str) {
 102                 direct_print_char(*str);
 103                 str++;
 104         }
 105 }
 106
 107 /* Standard and AT keyboard.  (PS/2 MCA implies AT throughout.) */
 108 #define KEYBD           0x60    /* I/O port for keyboard data */
 109 #define KB_STATUS       0x64    /* I/O port for status on AT */
 110 #define KB_OUT_FULL     0x01    /* status bit set when keypress char pending */
 111 #define KB_AUX_BYTE     0x20    /* Auxiliary Device Output Buffer Full */
 112
 113 int direct_read_char(unsigned char *ch)
 114 {
 115         unsigned long sb;
 116
 117         sb = inb(KB_STATUS);
 118
 119         if (!(sb & KB_OUT_FULL)) {
 120                 return 0;
 121         }
 122
 123         inb(KEYBD);
 124
 125         if (!(sb & KB_AUX_BYTE))
 126                 return 1;
 127
 128         return 0;
 129 }
 130