From 98098c3edad41d04379bb95076ac6581d99b8a64 Mon Sep 17 00:00:00 2001
From: jkim <jkim@FreeBSD.org>
Date: Thu, 11 Nov 2010 19:20:33 +0000
Subject: [PATCH] Add compat shim for apm(4) to translate APM BIOS function
 numbers from i386 to PC98-specific ones.  Any binaries using apm ioctl(4)
 commands but built for i386 should also work on PC98 now.

Reviewed by:	imp, nyan
---
 sys/i386/bios/apm.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/sys/i386/bios/apm.c b/sys/i386/bios/apm.c
index e015cd09f68c..f33bafdeddd6 100644
--- a/sys/i386/bios/apm.c
+++ b/sys/i386/bios/apm.c
@@ -1389,6 +1389,23 @@ apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td
 			return (EPERM);
 		/* XXX compatibility with the old interface */
 		args = (struct apm_bios_arg *)addr;
+#ifdef PC98
+		if (((args->eax >> 8) & 0xff) == 0x53) {
+			sc->bios.r.eax = args->eax & ~0xffff;
+			sc->bios.r.eax |= APM_BIOS << 8;
+			switch (args->eax & 0xff) {
+			case 0x0a:
+				sc->bios.r.eax |= APM_GETPWSTATUS;
+				break;
+			case 0x0e:
+				sc->bios.r.eax |= APM_DRVVERSION;
+				break;
+			default:
+				sc->bios.r.eax |= args->eax & 0xff;
+				break;
+			}
+		} else
+#endif
 		sc->bios.r.eax = args->eax;
 		sc->bios.r.ebx = args->ebx;
 		sc->bios.r.ecx = args->ecx;