typedef unsigned int uint;
typedef unsigned short ushort;
typedef unsigned char uchar;
static inline uchar
inb(ushort port)
{
uchar data;
asm volatile("in %1,%0" : "=a" (data) : "d" (port));
return data;
}
static inline void
outb(ushort port, uchar data)
{
asm volatile("out %0,%1" : : "a" (data), "d" (port));
}
static inline void
stosb(void *addr, int data, int cnt)
{
asm volatile("cld; rep stosb" :
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
static inline void
stosl(void *addr, int data, int cnt)
{
asm volatile("cld; rep stosl" :
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
void*
memset(void *dst, int c, uint n)
{
if ((int)dst%4 == 0 && n%4 == 0){
c &= 0xFF;
stosl(dst, (c<<24)|(c<<16)|(c<<8)|c, n/4);
} else
stosb(dst, c, n);
return dst;
}
void*
memmove(void *dst, const void *src, uint n)
{
const char *s;
char *d;
s = src;
d = dst;
if(s < d && s + n > d){
s += n;
d += n;
while(n-- > 0)
*--d = *--s;
} else
while(n-- > 0)
*d++ = *s++;
return dst;
}
#define KBSTATP 0x64 // kbd controller status port(I)
#define KBS_DIB 0x01 // kbd data in buffer
#define KBDATAP 0x60 // kbd data port(I)
#define NO 0
#define SHIFT (1<<0)
#define CTL (1<<1)
#define ALT (1<<2)
#define CAPSLOCK (1<<3)
#define NUMLOCK (1<<4)
#define SCROLLLOCK (1<<5)
#define E0ESC (1<<6)
// Special keycodes
#define KEY_HOME 0xE0
#define KEY_END 0xE1
#define KEY_UP 0xE2
#define KEY_DN 0xE3
#define KEY_LF 0xE4
#define KEY_RT 0xE5
#define KEY_PGUP 0xE6
#define KEY_PGDN 0xE7
#define KEY_INS 0xE8
#define KEY_DEL 0xE9
// C('A') == Control-A
#define C(x) (x - '@')
static uchar shiftcode[256] =
{
[0x1D] CTL,
[0x2A] SHIFT,
[0x36] SHIFT,
[0x38] ALT,
[0x9D] CTL,
[0xB8] ALT
};
static uchar togglecode[256] =
{
[0x3A] CAPSLOCK,
[0x45] NUMLOCK,
[0x46] SCROLLLOCK
};
static uchar normalmap[256] =
{
NO, 0x1B, '1', '2', '3', '4', '5', '6', // 0x00
'7', '8', '9', '0', '-', '=', '\b', '\t',
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', // 0x10
'o', 'p', '[', ']', '\n', NO, 'a', 's',
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', // 0x20
'\'', '`', NO, '\\', 'z', 'x', 'c', 'v',
'b', 'n', 'm', ',', '.', '/', NO, '*', // 0x30
NO, ' ', NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
'8', '9', '-', '4', '5', '6', '+', '1',
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
[0x9C] '\n', // KP_Enter
[0xB5] '/', // KP_Div
[0xC8] KEY_UP, [0xD0] KEY_DN,
[0xC9] KEY_PGUP, [0xD1] KEY_PGDN,
[0xCB] KEY_LF, [0xCD] KEY_RT,
[0x97] KEY_HOME, [0xCF] KEY_END,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
static uchar shiftmap[256] =
{
NO, 033, '!', '@', '#', '$', '%', '^', // 0x00
'&', '*', '(', ')', '_', '+', '\b', '\t',
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', // 0x10
'O', 'P', '{', '}', '\n', NO, 'A', 'S',
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', // 0x20
'"', '~', NO, '|', 'Z', 'X', 'C', 'V',
'B', 'N', 'M', '<', '>', '?', NO, '*', // 0x30
NO, ' ', NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
'8', '9', '-', '4', '5', '6', '+', '1',
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
[0x9C] '\n', // KP_Enter
[0xB5] '/', // KP_Div
[0xC8] KEY_UP, [0xD0] KEY_DN,
[0xC9] KEY_PGUP, [0xD1] KEY_PGDN,
[0xCB] KEY_LF, [0xCD] KEY_RT,
[0x97] KEY_HOME, [0xCF] KEY_END,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
static uchar ctlmap[256] =
{
NO, NO, NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, NO,
C('Q'), C('W'), C('E'), C('R'), C('T'), C('Y'), C('U'), C('I'),
C('O'), C('P'), NO, NO, '\r', NO, C('A'), C('S'),
C('D'), C('F'), C('G'), C('H'), C('J'), C('K'), C('L'), NO,
NO, NO, NO, C('\\'), C('Z'), C('X'), C('C'), C('V'),
C('B'), C('N'), C('M'), NO, NO, C('/'), NO, NO,
[0x9C] '\r', // KP_Enter
[0xB5] C('/'), // KP_Div
[0xC8] KEY_UP, [0xD0] KEY_DN,
[0xC9] KEY_PGUP, [0xD1] KEY_PGDN,
[0xCB] KEY_LF, [0xCD] KEY_RT,
[0x97] KEY_HOME, [0xCF] KEY_END,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
int
getc(void)
{
static uint shift;
static uchar *charcode[4] = {
normalmap, shiftmap, ctlmap, ctlmap
};
uint st, data, c;
st = inb(KBSTATP);
if((st & KBS_DIB) == 0)
return -1;
data = inb(KBDATAP);
if(data == 0xE0){
shift |= E0ESC;
return 0;
} else if(data & 0x80){
// Key released
data = (shift & E0ESC ? data : data & 0x7F);
shift &= ~(shiftcode[data] | E0ESC);
return 0;
} else if(shift & E0ESC){
// Last character was an E0 escape; or with 0x80
data |= 0x80;
shift &= ~E0ESC;
}
shift |= shiftcode[data];
shift ^= togglecode[data];
c = charcode[shift & (CTL | SHIFT)][data];
if(shift & CAPSLOCK){
if('a' <= c && c <= 'z')
c += 'A' - 'a';
else if('A' <= c && c <= 'Z')
c += 'a' - 'A';
}
return c;
}
#define BACKSPACE 0x100
#define CRTPORT 0x3d4
static ushort *crt = (ushort*)P2V(0xb8000); // CGA memory
static void
cgaputc(int c)
{
int pos;
// Cursor position: col + 80*row.
outb(CRTPORT, 14);
pos = inb(CRTPORT+1) << 8;
outb(CRTPORT, 15);
pos |= inb(CRTPORT+1);
if(c == '\n')
pos += 80 - pos%80;
else if(c == BACKSPACE){
if(pos > 0) --pos;
} else
crt[pos++] = (c&0xff) | 0x0700; // black on white
if((pos/80) >= 24){ // Scroll up.
memmove(crt, crt+80, sizeof(crt[0])*23*80);
pos -= 80;
memset(crt+pos, 0, sizeof(crt[0])*(24*80 - pos));
}
outb(CRTPORT, 14);
outb(CRTPORT+1, pos>>8);
outb(CRTPORT, 15);
outb(CRTPORT+1, pos);
crt[pos] = ' ' | 0x0700;
}
حالا اینطوری استفاده کن
int c;
while((c = getc()) >= 0){
cgaputc(c)
}
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