1 files changed, 107 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/biossmap.c b/sys/boot/i386/libi386/biossmap.c
new file mode 100644
index 0000000..1548dd9
--- /dev/null
+++ b/sys/boot/i386/libi386/biossmap.c
@@ -0,0 +1,107 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Obtain memory configuration information from the BIOS
+ */
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <machine/metadata.h>
+#include "bootstrap.h"
+#include "libi386.h"
+#include "btxv86.h"
+
+#define SMAPSIG	0x534D4150
+
+struct smap {
+	u_int64_t	base;
+	u_int64_t	length;
+	u_int32_t	type;
+} __packed;
+
+static struct smap smap;
+
+static struct smap *smapbase;
+static int smaplen;
+
+void
+bios_getsmap(void)
+{
+	int n;
+
+	n = 0;
+	smaplen = 0;
+	/* Count up segments in system memory map */
+	v86.ebx = 0;
+	do {
+		v86.ctl = V86_FLAGS;
+		v86.addr = 0x15;		/* int 0x15 function 0xe820*/
+		v86.eax = 0xe820;
+		v86.ecx = sizeof(struct smap);
+		v86.edx = SMAPSIG;
+		v86.es = VTOPSEG(&smap);
+		v86.edi = VTOPOFF(&smap);
+		v86int();
+		if ((v86.efl & 1) || (v86.eax != SMAPSIG))
+			break;
+		n++;
+	} while (v86.ebx != 0);
+	if (n == 0)
+		return;
+	n += 10;	/* spare room */
+	smapbase = malloc(n * sizeof(*smapbase));
+
+	/* Save system memory map */
+	v86.ebx = 0;
+	do {
+		v86.ctl = V86_FLAGS;
+		v86.addr = 0x15;		/* int 0x15 function 0xe820*/
+		v86.eax = 0xe820;
+		v86.ecx = sizeof(struct smap);
+		v86.edx = SMAPSIG;
+		v86.es = VTOPSEG(&smapbase[smaplen]);
+		v86.edi = VTOPOFF(&smapbase[smaplen]);
+		v86int();
+		smaplen++;
+		if ((v86.efl & 1) || (v86.eax != SMAPSIG))
+			break;
+	} while (v86.ebx != 0 && smaplen < n);
+}
+void
+bios_addsmapdata(struct preloaded_file *kfp)
+{
+	int len;
+
+	if (smapbase == 0 || smaplen == 0)
+		return;
+	len = smaplen * sizeof(*smapbase);
+	file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
+	/* Temporary compatability with older development kernels */
+	file_addmetadata(kfp, 0x0009, len, smapbase);
+}