mirror of https://github.com/ctm/syn68k.git
49 lines
927 B
C
49 lines
927 B
C
#ifdef MSDOS
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#include "syn68k_private.h"
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#ifndef SYNCHRONOUS_INTERRUPTS
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int
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dos_block_interrupts ()
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{
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unsigned long iflag;
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asm ("pushfl\n\t" /* We save the old eflags, which has interrupt mask bit. */
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"popl %0\n\t"
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"shrl $9,%0\n\t"
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"andl $1,%0\n\t"
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"jz 1f\n\t" /* Avoid CLI overhead under DPMI. */
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"cli\n"
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"1:"
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: "=r" (iflag)
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: : "cc");
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return iflag;
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}
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void
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dos_restore_interrupts (int onoff)
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{
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unsigned long current_iflag;
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asm ("pushfl\n\t" /* We save the old eflags, which has interrupt mask bit. */
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"popl %0\n\t"
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"shrl $9,%0\n\t"
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"andl $1,%0"
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: "=r" (current_iflag)
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: : "cc");
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if (onoff != current_iflag)
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{
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/* Only execute these when necessary, to avoid DPMI overhead. */
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if (onoff)
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asm ("sti");
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else
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asm ("cli");
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}
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}
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#endif /* !SYNCHRONOUS_INTERRUPTS */
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#endif /* MSDOS */
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