Add our doscmd to the tree. This is a result of work from BSDI, and

a group of dos emulator developers.
Submitted by:	Jonathan Lemon <jlemon@americantv.com>
Obtained from:	BSDI

1 files changed, 65 insertions, 0 deletions

diff --git a/usr.bin/doscmd/xms.c b/usr.bin/doscmd/xms.c
new file mode 100644
index 0000000..c1524de
--- /dev/null
+++ b/usr.bin/doscmd/xms.c
@@ -0,0 +1,65 @@
+/*
+** No copyright?!
+**
+** $Id: xms.c,v 1.3 1996/09/22 15:43:01 miff Exp $
+*/
+#include "doscmd.h"
+
+u_long xms_vector;
+
+int
+int2f_43(regcontext_t *REGS)
+{               
+
+    switch (R_AL) {
+    case 0x00:			/* installation check */
+	R_AL = 0x80;
+	break;
+
+    case 0x10:			/* get handler address */
+	N_PUTVEC(R_ES, R_BX, xms_vector);
+	break;
+
+    default:
+	return (0);
+    }
+    return (1);
+}
+
+/*
+** XXX DANGER WILL ROBINSON!
+*/
+static void
+xms_entry(regcontext_t *REGS)
+{
+    switch (R_AH) {
+    case 0x00:			/* get version number */
+	R_AX = 0x0300;		/* 3.0 */
+	R_BX = 0x0001;		/* internal revision 0.1 */
+	R_DX = 0x0001;		/* HMA exists */
+	break;
+
+    default:
+	debug(D_ALWAYS, "XMS %02x\n", R_AH);
+	R_AX = 0;
+	break;
+    }
+}
+
+static u_char xms_trampoline[] = {
+    0xeb,	/* JMP 5 */
+    0x03,
+    0x90,	/* NOP */
+    0x90,	/* NOP */
+    0x90,	/* NOP */
+    0xf4,	/* HLT */
+    0xcb,	/* RETF */
+};
+
+void
+xms_init(void)
+{
+    xms_vector = insert_generic_trampoline(
+	sizeof(xms_trampoline), xms_trampoline);
+    register_callback(xms_vector + 5, xms_entry, "xms");
+}