86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* Etherboot routines for PCBIOS firmware.
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*
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* Body of routines taken from old pcbios.S
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*/
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#ifdef PCBIOS
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#include "etherboot.h"
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#include "realmode.h"
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#include "segoff.h"
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#define ZF ( 1 << 6 )
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/**************************************************************************
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CONSOLE_PUTC - Print a character on console
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**************************************************************************/
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void console_putc ( int character )
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{
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struct {
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reg16_t ax;
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} PACKED in_stack;
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RM_FRAGMENT(rm_console_putc,
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"sti\n\t"
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"popw %ax\n\t"
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"movb $0x0e, %ah\n\t"
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"movl $1, %ebx\n\t"
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"int $0x10\n\t"
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"cli\n\t"
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);
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in_stack.ax.l = character;
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real_call ( rm_console_putc, &in_stack, NULL );
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}
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/**************************************************************************
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CONSOLE_GETC - Get a character from console
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**************************************************************************/
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int console_getc ( void )
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{
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RM_FRAGMENT(rm_console_getc,
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"sti\n\t"
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"xorw %ax, %ax\n\t"
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"int $0x16\n\t"
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"xorb %ah, %ah\n\t"
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"cli\n\t"
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);
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return real_call ( rm_console_getc, NULL, NULL );
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}
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/**************************************************************************
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CONSOLE_ISCHAR - Check for keyboard interrupt
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**************************************************************************/
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int console_ischar ( void )
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{
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RM_FRAGMENT(rm_console_ischar,
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"sti\n\t"
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"movb $1, %ah\n\t"
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"int $0x16\n\t"
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"pushfw\n\t"
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"popw %ax\n\t"
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"cli\n\t"
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);
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return ( ( real_call ( rm_console_ischar, NULL, NULL ) & ZF ) == 0 );
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}
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/**************************************************************************
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GETSHIFT - Get keyboard shift state
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**************************************************************************/
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int getshift ( void )
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{
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RM_FRAGMENT(rm_getshift,
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"sti\n\t"
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"movb $2, %ah\n\t"
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"int $0x16\n\t"
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"andw $0x3, %ax\n\t"
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"cli\n\t"
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);
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return real_call ( rm_getshift, NULL, NULL );
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}
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#endif /* PCBIOS */
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