commit 266603019eceab96582d374e3673a4f8ff870c18
Author: Andriy Gapon <avg@icyb.net.ua>
Date:   Thu Jun 10 10:22:46 2010 +0300

    [local]smap: a micromodule to (re)print SMAP information from loader

diff --git a/sys/dev/smap/smap.c b/sys/dev/smap/smap.c
new file mode 100644
index 0000000..e233ee2
--- /dev/null
+++ b/sys/dev/smap/smap.c
@@ -0,0 +1,150 @@
+/*-
+ * Copyright (c) 2010 Andriy Gapon
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/conf.h>
+#include <sys/linker.h>
+#include <sys/module.h>
+
+#include <machine/metadata.h>
+#include <machine/psl.h>
+#include <machine/pc/bios.h>
+
+#if 0
+#include <compat/x86bios/x86bios.h>
+
+
+struct smap_buf {
+	struct bios_smap	smap;
+	uint32_t		xattr;	/* Extended attribute from ACPI 3.0 */
+};
+#define	SMAP_BUFSIZE		sizeof(struct smap_buf)
+
+
+static int
+smap_getsmap(void)
+{
+	x86regs_t	regs;
+	struct smap_buf	*buf;
+	uint32_t	off;
+
+	if (x86bios_get_intr(0x15) == 0)
+		return (ENXIO);
+
+	buf = x86bios_alloc(&off, SMAP_BUFSIZE);
+
+	x86bios_init_regs(&regs);
+	regs.R_EBX = 0;
+
+	do {
+		regs.R_EAX = 0xE820;
+		regs.R_ECX = SMAP_BUFSIZE;
+		regs.R_EDX = SMAP_SIG;
+		regs.R_ES = X86BIOS_PHYSTOSEG(off);
+		regs.R_EDI = X86BIOS_PHYSTOOFF(off);
+
+		x86bios_intr(&regs, 0x15);
+
+		if ((regs.R_EFLG & PSL_C) != 0 || regs.R_EAX != SMAP_SIG ||
+		    regs.R_ECX < sizeof(buf->smap) || regs.R_ECX > SMAP_BUFSIZE) {
+			printf("error\n");
+			break;
+		}
+		printf("SMAP type=%02x base=%016llx len=%016llx",
+		    (unsigned int)buf->smap.type,
+		    (unsigned long long)buf->smap.base,
+		    (unsigned long long)buf->smap.length);
+		if (regs.R_ECX == SMAP_BUFSIZE)
+			printf(" attr=%02x", (unsigned int)buf->xattr);
+		printf("\n");
+	} while (regs.R_EBX != 0);
+
+	x86bios_free(&off, SMAP_BUFSIZE);
+	return (0);
+}
+#endif
+
+static void
+smap_getsmap(void)
+{
+	struct bios_smap *smapbase, *smap, *smapend;
+	caddr_t kmdp;
+	u_int32_t smapsize;
+
+	kmdp = preload_search_by_type("elf kernel");
+	if (kmdp == NULL)
+		kmdp = preload_search_by_type("elf64 kernel");
+	if (kmdp == NULL) {
+		printf("Can't find kernel!\n");
+		return;
+	}
+
+	/*
+	 * get memory map from INT 15:E820, kindly supplied by the loader.
+	 *
+	 * subr_module.c says:
+	 * "Consumer may safely assume that size value precedes data."
+	 * ie: an int32_t immediately precedes smap.
+	 */
+	smapbase = (struct bios_smap *)preload_search_info(kmdp,
+	    MODINFO_METADATA | MODINFOMD_SMAP);
+	if (smapbase == NULL) {
+		printf("No BIOS smap info from loader!\n");
+		return;
+	}
+
+	smapsize = *((u_int32_t *)smapbase - 1);
+	smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
+
+	for (smap = smapbase; smap < smapend; smap++)
+		printf("SMAP type=%02x base=%016lx end=%016lx len=%016lx\n",
+		    smap->type, smap->base, smap->base + smap->length,
+		    smap->length);
+}
+
+static int
+smap_modevent(module_t mod __unused, int type, void *data __unused)
+{
+	switch (type) {
+	case MOD_LOAD:
+		printf("smap: loaded\n");
+		smap_getsmap();
+		break;
+	case MOD_UNLOAD:
+	case MOD_SHUTDOWN:
+		printf("smap: unloaded\n");
+		break;
+	default:
+		return (EOPNOTSUPP);
+	}
+	return (0);
+}
+DEV_MODULE(smap, smap_modevent, NULL);
diff --git a/sys/modules/smap/Makefile b/sys/modules/smap/Makefile
new file mode 100644
index 0000000..cc04193
--- /dev/null
+++ b/sys/modules/smap/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../dev/smap
+
+KMOD=	smap
+SRCS=	smap.c
+
+.include <bsd.kmod.mk>