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Support PC engines WRAP (From OpenBSD)

This commit is contained in:
manu 2005-06-24 13:00:01 +00:00
parent 2fdb742bc5
commit 9a51ea013a
1 changed files with 13 additions and 4 deletions
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17
sys/arch/i386/stand/lib/gatea20.c
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@ -1,4 +1,4 @@
/* $NetBSD: gatea20.c,v 1.5 2002/08/12 14:27:34 thorpej Exp $ */
/* $NetBSD: gatea20.c,v 1.6 2005/06/24 13:00:01 manu Exp $ */
/* extracted from freebsd:sys/i386/boot/biosboot/io.c */
@ -41,20 +41,29 @@ void gateA20()
#ifdef SUPPORT_PS2
biosmca_ps2model == 0xf82 ||
#endif
/* XXX How to check for AMD Elan SC520? */
0) {
outb(0x92, 0x2);
(inb(K_STATUS) == 0xff && inb(K_RDWR) == 0xff)) {
int data;
data = inb(0x92);
outb(0x92, data | 0x2);
} else {
while (inb(K_STATUS) & K_IBUF_FUL);
while (inb(K_STATUS) & K_OBUF_FUL)
(void)inb(K_RDWR);
outb(K_CMD, KC_CMD_WOUT);
delay(100);
while (inb(K_STATUS) & K_IBUF_FUL);
outb(K_RDWR, x_20);
delay(100);
while (inb(K_STATUS) & K_IBUF_FUL);
while (inb(K_STATUS) & K_OBUF_FUL)
(void)inb(K_RDWR);
}
__asm("popfl");
}