f70172129c
if no lapic available, use 8253pit for clock now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
416 lines
8.3 KiB
C
416 lines
8.3 KiB
C
#include "types.h"
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#include "x86.h"
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#include "traps.h"
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#include "defs.h"
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#include "spinlock.h"
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#include "dev.h"
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#include "param.h"
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struct spinlock console_lock;
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int panicked = 0;
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int use_console_lock = 0;
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// Copy console output to parallel port, which you can tell
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// .bochsrc to copy to the stdout:
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// parport1: enabled=1, file="/dev/stdout"
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static void
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lpt_putc(int c)
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{
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int i;
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for(i = 0; !(inb(0x378+1) & 0x80) && i < 12800; i++)
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;
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outb(0x378+0, c);
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outb(0x378+2, 0x08|0x04|0x01);
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outb(0x378+2, 0x08);
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}
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static void
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cons_putc(int c)
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{
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int crtport = 0x3d4; // io port of CGA
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ushort *crt = (ushort*) 0xB8000; // base of CGA memory
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int ind;
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if(panicked){
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cli();
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for(;;)
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;
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}
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lpt_putc(c);
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// cursor position, 16 bits, col + 80*row
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outb(crtport, 14);
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ind = inb(crtport + 1) << 8;
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outb(crtport, 15);
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ind |= inb(crtport + 1);
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c &= 0xff;
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if(c == '\n'){
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ind -= (ind % 80);
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ind += 80;
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} else {
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c |= 0x0700; // black on white
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crt[ind] = c;
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ind++;
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}
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if((ind / 80) >= 24){
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// scroll up
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memmove(crt, crt + 80, sizeof(crt[0]) * (23 * 80));
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ind -= 80;
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memset(crt + ind, 0, sizeof(crt[0]) * ((24 * 80) - ind));
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}
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outb(crtport, 14);
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outb(crtport + 1, ind >> 8);
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outb(crtport, 15);
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outb(crtport + 1, ind);
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}
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void
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printint(int xx, int base, int sgn)
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{
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char buf[16];
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char digits[] = "0123456789ABCDEF";
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int i = 0, neg = 0;
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uint x;
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if(sgn && xx < 0){
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neg = 1;
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x = 0 - xx;
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} else {
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x = xx;
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}
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do {
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buf[i++] = digits[x % base];
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} while((x /= base) != 0);
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if(neg)
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buf[i++] = '-';
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while(--i >= 0)
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cons_putc(buf[i]);
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}
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// Print to the console. only understands %d, %x, %p, %s.
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void
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cprintf(char *fmt, ...)
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{
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int i, state = 0, c, locking = 0;
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uint *ap = (uint*)(void*)&fmt + 1;
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if(use_console_lock){
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locking = 1;
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acquire(&console_lock);
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}
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for(i = 0; fmt[i]; i++){
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c = fmt[i] & 0xff;
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if(state == 0){
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if(c == '%'){
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state = '%';
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} else {
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cons_putc(c);
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}
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} else if(state == '%'){
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if(c == 'd'){
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printint(*ap, 10, 1);
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ap++;
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} else if(c == 'x' || c == 'p'){
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printint(*ap, 16, 0);
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ap++;
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} else if(c == 's'){
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char *s = (char*)*ap;
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ap++;
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if(s == 0){
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cons_putc('0');
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}else{
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while(*s != 0){
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cons_putc(*s);
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s++;
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}
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}
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} else if(c == '%'){
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cons_putc(c);
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} else {
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// Unknown % sequence. Print it to draw attention.
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cons_putc('%');
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cons_putc(c);
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}
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state = 0;
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}
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}
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if(locking)
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release(&console_lock);
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}
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void
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panic(char *s)
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{
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__asm __volatile("cli");
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use_console_lock = 0;
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cprintf("panic (%d): ", cpu());
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cprintf(s, 0);
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cprintf("\n", 0);
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panicked = 1; // freeze other CPU
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for(;;)
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;
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}
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int
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console_write(int minor, char *buf, int n)
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{
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int i;
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acquire(&console_lock);
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for(i = 0; i < n; i++) {
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cons_putc(buf[i] & 0xff);
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}
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release(&console_lock);
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return n;
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}
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#define KBSTATP 0x64 // kbd controller status port(I)
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#define KBS_DIB 0x01 // kbd data in buffer
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#define KBDATAP 0x60 // kbd data port(I)
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#define NO 0
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#define SHIFT (1<<0)
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#define CTL (1<<1)
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#define ALT (1<<2)
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#define CAPSLOCK (1<<3)
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#define NUMLOCK (1<<4)
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#define SCROLLLOCK (1<<5)
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#define E0ESC (1<<6)
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// Special keycodes
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#define KEY_HOME 0xE0
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#define KEY_END 0xE1
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#define KEY_UP 0xE2
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#define KEY_DN 0xE3
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#define KEY_LF 0xE4
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#define KEY_RT 0xE5
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#define KEY_PGUP 0xE6
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#define KEY_PGDN 0xE7
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#define KEY_INS 0xE8
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#define KEY_DEL 0xE9
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static uchar shiftcode[256] =
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{
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[0x1D] CTL,
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[0x2A] SHIFT,
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[0x36] SHIFT,
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[0x38] ALT,
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[0x9D] CTL,
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[0xB8] ALT
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};
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static uchar togglecode[256] =
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{
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[0x3A] CAPSLOCK,
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[0x45] NUMLOCK,
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[0x46] SCROLLLOCK
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};
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static uchar normalmap[256] =
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{
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NO, 0x1B, '1', '2', '3', '4', '5', '6', // 0x00
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'7', '8', '9', '0', '-', '=', '\b', '\t',
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'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', // 0x10
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'o', 'p', '[', ']', '\n', NO, 'a', 's',
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'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', // 0x20
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'\'', '`', NO, '\\', 'z', 'x', 'c', 'v',
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'b', 'n', 'm', ',', '.', '/', NO, '*', // 0x30
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NO, ' ', NO, NO, NO, NO, NO, NO,
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NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
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'8', '9', '-', '4', '5', '6', '+', '1',
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'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
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[0x97] KEY_HOME,
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[0x9C] '\n', // KP_Enter
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[0xB5] '/', // KP_Div
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[0xC8] KEY_UP,
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[0xC9] KEY_PGUP,
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[0xCB] KEY_LF,
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[0xCD] KEY_RT,
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[0xCF] KEY_END,
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[0xD0] KEY_DN,
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[0xD1] KEY_PGDN,
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[0xD2] KEY_INS,
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[0xD3] KEY_DEL
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};
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static uchar shiftmap[256] =
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{
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NO, 033, '!', '@', '#', '$', '%', '^', // 0x00
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'&', '*', '(', ')', '_', '+', '\b', '\t',
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'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', // 0x10
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'O', 'P', '{', '}', '\n', NO, 'A', 'S',
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'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', // 0x20
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'"', '~', NO, '|', 'Z', 'X', 'C', 'V',
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'B', 'N', 'M', '<', '>', '?', NO, '*', // 0x30
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NO, ' ', NO, NO, NO, NO, NO, NO,
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NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
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'8', '9', '-', '4', '5', '6', '+', '1',
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'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
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[0x97] KEY_HOME,
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[0x9C] '\n', // KP_Enter
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[0xB5] '/', // KP_Div
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[0xC8] KEY_UP,
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[0xC9] KEY_PGUP,
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[0xCB] KEY_LF,
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[0xCD] KEY_RT,
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[0xCF] KEY_END,
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[0xD0] KEY_DN,
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[0xD1] KEY_PGDN,
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[0xD2] KEY_INS,
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[0xD3] KEY_DEL
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};
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#define C(x) (x - '@')
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static uchar ctlmap[256] =
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{
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NO, NO, NO, NO, NO, NO, NO, NO,
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NO, NO, NO, NO, NO, NO, NO, NO,
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C('Q'), C('W'), C('E'), C('R'), C('T'), C('Y'), C('U'), C('I'),
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C('O'), C('P'), NO, NO, '\r', NO, C('A'), C('S'),
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C('D'), C('F'), C('G'), C('H'), C('J'), C('K'), C('L'), NO,
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NO, NO, NO, C('\\'), C('Z'), C('X'), C('C'), C('V'),
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C('B'), C('N'), C('M'), NO, NO, C('/'), NO, NO,
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[0x97] KEY_HOME,
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[0xB5] C('/'), // KP_Div
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[0xC8] KEY_UP,
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[0xC9] KEY_PGUP,
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[0xCB] KEY_LF,
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[0xCD] KEY_RT,
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[0xCF] KEY_END,
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[0xD0] KEY_DN,
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[0xD1] KEY_PGDN,
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[0xD2] KEY_INS,
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[0xD3] KEY_DEL
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};
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static uchar *charcode[4] = {
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normalmap,
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shiftmap,
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ctlmap,
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ctlmap
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};
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#define KBD_BUF 64
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char kbd_buf[KBD_BUF];
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int kbd_r;
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int kbd_w;
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struct spinlock kbd_lock;
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static uint shift;
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void
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kbd_intr()
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{
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uint st, data, c;
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acquire(&kbd_lock);
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st = inb(KBSTATP);
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if((st & KBS_DIB) == 0){
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release(&kbd_lock);
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return;
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}
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data = inb(KBDATAP);
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if(data == 0xE0) {
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shift |= E0ESC;
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release(&kbd_lock);
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return;
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} else if(data & 0x80) {
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// Key released
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data = (shift & E0ESC ? data : data & 0x7F);
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shift &= ~(shiftcode[data] | E0ESC);
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release(&kbd_lock);
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return;
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} else if(shift & E0ESC) {
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// Last character was an E0 escape; or with 0x80
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data |= 0x80;
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shift &= ~E0ESC;
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}
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shift |= shiftcode[data];
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shift ^= togglecode[data];
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c = charcode[shift & (CTL | SHIFT)][data];
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if(shift & CAPSLOCK) {
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if('a' <= c && c <= 'z')
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c += 'A' - 'a';
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else if('A' <= c && c <= 'Z')
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c += 'a' - 'A';
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}
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// xxx hack
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if(c == 0x0) {
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release(&kbd_lock);
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return;
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}
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if(((kbd_w + 1) % KBD_BUF) != kbd_r){
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kbd_buf[kbd_w++] = c;
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if(kbd_w >= KBD_BUF)
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kbd_w = 0;
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wakeup(&kbd_r);
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} else {
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cprintf("kbd overflow\n");
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}
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release(&kbd_lock);
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}
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int
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console_read(int minor, char *dst, int n)
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{
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uint target = n;
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acquire(&kbd_lock);
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while(kbd_w == kbd_r) {
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sleep(&kbd_r, &kbd_lock);
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}
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while(n > 0 && kbd_w != kbd_r){
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*dst = (kbd_buf[kbd_r]) & 0xff;
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cons_putc(*dst & 0xff);
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dst++;
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--n;
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kbd_r++;
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if(kbd_r >= KBD_BUF)
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kbd_r = 0;
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}
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release(&kbd_lock);
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return target - n;
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}
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void
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console_init()
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{
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initlock(&console_lock, "console");
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initlock(&kbd_lock, "kbd");
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devsw[CONSOLE].d_write = console_write;
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devsw[CONSOLE].d_read = console_read;
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irq_setmask_8259A(irq_mask_8259A & ~(1 << IRQ_KBD));
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ioapic_enable(IRQ_KBD, 0);
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use_console_lock = 1;
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}
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