NetBSD/sys/arch/i386/stand/lib/conio.S

103 lines
1.7 KiB
ArmAsm
Raw Normal View History

/* $NetBSD: conio.S,v 1.1.1.1 1997/03/14 02:40:32 perry Exp $ */
/* PC console handling
originally from: FreeBSD:sys/i386/boot/netboot/start2.S
*/
#include <machine/asm.h>
#define data32 .byte 0x66
.text
/**************************************************************************
PUTC - Print a character
**************************************************************************/
ENTRY(conputc)
push %ebp
mov %esp,%ebp
push %ecx
push %ebx
push %esi
push %edi
movb 8(%ebp),%cl
call _C_LABEL(prot_to_real) # enter real mode
movb %cl,%al
data32
mov $1,%ebx
movb $0x0e,%ah
int $0x10
data32
call _C_LABEL(real_to_prot) # back to protected mode
pop %edi
pop %esi
pop %ebx
pop %ecx
pop %ebp
ret
/**************************************************************************
GETC - Get a character
**************************************************************************/
ENTRY(congetc)
push %ebp
mov %esp,%ebp
push %ebx
push %esi
push %edi
call _C_LABEL(prot_to_real) # enter real mode
movb $0x0,%ah
int $0x16
movb %al,%bl
data32
call _C_LABEL(real_to_prot) # back to protected mode
xor %eax,%eax
movb %bl,%al
pop %edi
pop %esi
pop %ebx
pop %ebp
ret
/**************************************************************************
ISKEY - Check for keyboard interrupt
**************************************************************************/
ENTRY(coniskey)
push %ebp
mov %esp,%ebp
push %ebx
push %esi
push %edi
call _C_LABEL(prot_to_real) # enter real mode
xor %ebx,%ebx
movb $0x1,%ah
int $0x16
data32
jz 1f
movb %al,%bl
1:
data32
call _C_LABEL(real_to_prot) # back to protected mode
xor %eax,%eax
movb %bl,%al
pop %edi
pop %esi
pop %ebx
pop %ebp
ret