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