src/sys/arch/i386/stand/lib/gatea20.c - diff

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version 1.2, 1997/10/29 00:32:49

version 1.3, 2000/05/11 16:11:54

Line 27

* Gate A20 for high memory

#ifndef IBM_L40

static unsigned char x_20 = KB_A20;

#endif

void gateA20()

{

__asm("pushfl ; cli");

#ifdef IBM_L40

outb(0x92, 0x2);

#else IBM_L40

#else /* !IBM_L40 */

while (inb(K_STATUS) & K_IBUF_FUL);

while (inb(K_STATUS) & K_OBUF_FUL)

(void)inb(K_RDWR);

Line 44 void gateA20()

Line 46 void gateA20()

outb(K_RDWR, x_20);

delay(100);

while (inb(K_STATUS) & K_IBUF_FUL);

#endif IBM_L40

#endif /* IBM_L40 */

__asm("popfl");

}