MFC 270828,271487,271495:

Add sysctls to export the BIOS SMAP and EFI memory maps along with
handlers in the sysctl(8) binary to format them.

1 files changed, 36 insertions, 0 deletions

diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c
index 145f3c6..ec435c1 100644
--- a/sys/i386/i386/machdep.c
+++ b/sys/i386/i386/machdep.c
@@ -3104,6 +3104,42 @@ cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
 	pcpu->pc_acpi_id = 0xffffffff;
 }
 
+static int
+smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
+{
+	struct bios_smap *smapbase;
+	struct bios_smap_xattr smap;
+	caddr_t kmdp;
+	uint32_t *smapattr;
+	int count, error, i;
+
+	/* Retrieve the system memory map from the loader. */
+	kmdp = preload_search_by_type("elf kernel");
+	if (kmdp == NULL)
+		kmdp = preload_search_by_type("elf32 kernel");
+	smapbase = (struct bios_smap *)preload_search_info(kmdp,
+	    MODINFO_METADATA | MODINFOMD_SMAP);
+	if (smapbase == NULL)
+		return (0);
+	smapattr = (uint32_t *)preload_search_info(kmdp,
+	    MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
+	count = *((u_int32_t *)smapbase - 1) / sizeof(*smapbase);
+	error = 0;
+	for (i = 0; i < count; i++) {
+		smap.base = smapbase[i].base;
+		smap.length = smapbase[i].length;
+		smap.type = smapbase[i].type;
+		if (smapattr != NULL)
+			smap.xattr = smapattr[i];
+		else
+			smap.xattr = 0;
+		error = SYSCTL_OUT(req, &smap, sizeof(smap));
+	}
+	return (error);
+}
+SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
+    smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
+
 void
 spinlock_enter(void)
 {