diff options
Diffstat (limited to 'arch/i386/boot/tty.c')
-rw-r--r-- | arch/i386/boot/tty.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/arch/i386/boot/tty.c b/arch/i386/boot/tty.c deleted file mode 100644 index f3f14bd2637..00000000000 --- a/arch/i386/boot/tty.c +++ /dev/null @@ -1,112 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright (C) 1991, 1992 Linus Torvalds - * Copyright 2007 rPath, Inc. - All Rights Reserved - * - * This file is part of the Linux kernel, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -/* - * arch/i386/boot/tty.c - * - * Very simple screen I/O - * XXX: Probably should add very simple serial I/O? - */ - -#include "boot.h" - -/* - * These functions are in .inittext so they can be used to signal - * error during initialization. - */ - -void __attribute__((section(".inittext"))) putchar(int ch) -{ - unsigned char c = ch; - - if (c == '\n') - putchar('\r'); /* \n -> \r\n */ - - /* int $0x10 is known to have bugs involving touching registers - it shouldn't. Be extra conservative... */ - asm volatile("pushal; pushw %%ds; int $0x10; popw %%ds; popal" - : : "b" (0x0007), "c" (0x0001), "a" (0x0e00|ch)); -} - -void __attribute__((section(".inittext"))) puts(const char *str) -{ - int n = 0; - while (*str) { - putchar(*str++); - n++; - } -} - -/* - * Read the CMOS clock through the BIOS, and return the - * seconds in BCD. - */ - -static u8 gettime(void) -{ - u16 ax = 0x0200; - u16 cx, dx; - - asm volatile("int $0x1a" - : "+a" (ax), "=c" (cx), "=d" (dx) - : : "ebx", "esi", "edi"); - - return dx >> 8; -} - -/* - * Read from the keyboard - */ -int getchar(void) -{ - u16 ax = 0; - asm volatile("int $0x16" : "+a" (ax)); - - return ax & 0xff; -} - -static int kbd_pending(void) -{ - u8 pending; - asm volatile("int $0x16; setnz %0" - : "=rm" (pending) - : "a" (0x0100)); - return pending; -} - -void kbd_flush(void) -{ - for (;;) { - if (!kbd_pending()) - break; - getchar(); - } -} - -int getchar_timeout(void) -{ - int cnt = 30; - int t0, t1; - - t0 = gettime(); - - while (cnt) { - if (kbd_pending()) - return getchar(); - - t1 = gettime(); - if (t0 != t1) { - cnt--; - t0 = t1; - } - } - - return 0; /* Timeout! */ -} |