Add EFI support to the installer. This requires that the kernel provide

a sysctl to determine what firmware is in use. This sysctl does not exist
yet, so the following blocks are in front of the wheels:
- I've provisionally called this "hw.platform" after the equivalent thing
  on PPC
- The logic to check the sysctl is short-circuited to always choose BIOS.
  There's a comment in the top of the file about how to turn this off.

If IA64 acquired a boot1.efifat-like thing (probably with very few
modifications), the same code could be adapted there.

usr.sbin/bsdinstall/partedit/gpart_ops.c

@@ -584,7 +584,7 @@ set_default_part_metadata(const char *name, const char *scheme,
 
 	if (strcmp(type, "freebsd-swap") == 0)
 		mountpoint = "none";
-	if (strcmp(type, "freebsd-boot") == 0)
+	if (strcmp(type, bootpart_type(scheme)) == 0)
 		md->bootcode = 1;
 
 	/* VTOC8 needs partcode in UFS partitions */
@@ -949,7 +949,8 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 		LIST_FOREACH(gc, &pp->lg_config, lg_config)
 			if (strcmp(gc->lg_name, "type") == 0)
 				break;
-		if (gc != NULL && strcmp(gc->lg_val, "freebsd-boot") == 0)
+		if (gc != NULL && strcmp(gc->lg_val,
+		    bootpart_type(scheme)) == 0)
 			break;
 	}
 
@@ -971,7 +972,7 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 			gctl_ro_param(r, "arg0", -1, geom->lg_name);
 			gctl_ro_param(r, "flags", -1, GPART_FLAGS);
 			gctl_ro_param(r, "verb", -1, "add");
-			gctl_ro_param(r, "type", -1, "freebsd-boot");
+			gctl_ro_param(r, "type", -1, bootpart_type(scheme));
 			snprintf(sizestr, sizeof(sizestr), "%jd",
 			    bootpart_size(scheme) / sector);
 			gctl_ro_param(r, "size", -1, sizestr);
@@ -1031,7 +1032,7 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 	gctl_issue(r); /* Error usually expected and non-fatal */
 	gctl_free(r);
 
-	if (strcmp(items[0].text, "freebsd-boot") == 0)
+	if (strcmp(items[0].text, bootpart_type(scheme)) == 0)
 		get_part_metadata(newpartname, 1)->bootcode = 1;
 	else if (strcmp(items[0].text, "freebsd") == 0)
 		gpart_partition(newpartname, "BSD");

usr.sbin/bsdinstall/partedit/partedit.h

@@ -74,9 +74,10 @@ void set_default_part_metadata(const char *name, const char *scheme,
 
 /* machine-dependent bootability checks */
 const char *default_scheme(void);
-int is_scheme_bootable(const char *part_type);
-size_t bootpart_size(const char *part_type);
-const char *bootcode_path(const char *part_type);
-const char *partcode_path(const char *part_type);
+int is_scheme_bootable(const char *scheme);
+size_t bootpart_size(const char *scheme);
+const char *bootpart_type(const char *scheme);
+const char *bootcode_path(const char *scheme);
+const char *partcode_path(const char *scheme);
 
 #endif

usr.sbin/bsdinstall/partedit/partedit_generic.c

@@ -57,6 +57,11 @@ bootpart_size(const char *part_type) {
 	return (0);
 }
 
+const char *
+bootpart_type(const char *scheme) {
+	return ("freebsd-boot");
+}
+
 const char *
 bootcode_path(const char *part_type) {
 	return (NULL);

usr.sbin/bsdinstall/partedit/partedit_pc98.c

@@ -51,6 +51,11 @@ bootpart_size(const char *part_type) {
 	return (0);
 }
 
+const char *
+bootpart_type(const char *scheme) {
+	return ("freebsd-boot");
+}
+
 const char *
 bootcode_path(const char *part_type) {
 	if (strcmp(part_type, "PC98") == 0)

usr.sbin/bsdinstall/partedit/partedit_powerpc.c

@@ -73,6 +73,11 @@ bootpart_size(const char *part_type) {
 	return (0);
 }
 
+const char *
+bootpart_type(const char *scheme) {
+	return ("freebsd-boot");
+}
+
 const char *
 bootcode_path(const char *part_type) {
 	return (NULL);

usr.sbin/bsdinstall/partedit/partedit_sparc64.c

@@ -49,6 +49,11 @@ bootpart_size(const char *part_type) {
 	return (0);
 }
 
+const char *
+bootpart_type(const char *scheme) {
+	return ("freebsd-boot");
+}
+
 const char *
 bootcode_path(const char *part_type) {
 	return (NULL);

usr.sbin/bsdinstall/partedit/partedit_x86.c

@@ -26,10 +26,15 @@
  * $FreeBSD$
  */
 
+#include <sys/types.h>
+#include <sys/sysctl.h>
 #include <string.h>
 
 #include "partedit.h"
 
+static char platform[255] = "BIOS"; /* XXX once sysctl exists, make this an empty string */
+static const char *platform_sysctl = "hw.platform";
+
 const char *
 default_scheme(void) {
 	return ("GPT");
@@ -37,27 +42,60 @@ default_scheme(void) {
 
 int
 is_scheme_bootable(const char *part_type) {
-	if (strcmp(part_type, "BSD") == 0)
-		return (1);
+	size_t platlen = sizeof(platform);
+	if (strlen(platform) == 0)
+		sysctlbyname(platform_sysctl, platform, &platlen, NULL, -1);
+
 	if (strcmp(part_type, "GPT") == 0)
 		return (1);
-	if (strcmp(part_type, "MBR") == 0)
-		return (1);
+	if (strcmp(platform, "BIOS") == 0) {
+		if (strcmp(part_type, "BSD") == 0)
+			return (1);
+		if (strcmp(part_type, "MBR") == 0)
+			return (1);
+	}
 
 	return (0);
 }
 
 size_t
-bootpart_size(const char *part_type) {
-	if (strcmp(part_type, "GPT") == 0)
-		return (64*1024);
+bootpart_size(const char *scheme) {
+	size_t platlen = sizeof(platform);
+	if (strlen(platform) == 0)
+		sysctlbyname(platform_sysctl, platform, &platlen, NULL, -1);
 
 	/* No partcode except for GPT */
+	if (strcmp(scheme, "GPT") != 0)
+		return (0);
+
+	if (strcmp(platform, "BIOS") == 0)
+		return (64*1024);
+	else 
+		return (800*1024);
+
 	return (0);
 }
 
+const char *
+bootpart_type(const char *scheme) {
+	size_t platlen = sizeof(platform);
+	if (strlen(platform) == 0)
+		sysctlbyname(platform_sysctl, platform, &platlen, NULL, -1);
+
+	if (strcmp(platform, "EFI") == 0)
+		return ("efi");
+
+	return ("freebsd-boot");
+}
+
 const char *
 bootcode_path(const char *part_type) {
+	size_t platlen = sizeof(platform);
+	if (strlen(platform) == 0)
+		sysctlbyname(platform_sysctl, platform, &platlen, NULL, -1);
+	if (strcmp(platform, "EFI") == 0)
+		return (NULL);
+
 	if (strcmp(part_type, "GPT") == 0)
 		return ("/boot/pmbr");
 	if (strcmp(part_type, "MBR") == 0)
@@ -70,8 +108,16 @@ bootcode_path(const char *part_type) {
 	
 const char *
 partcode_path(const char *part_type) {
-	if (strcmp(part_type, "GPT") == 0)
-		return ("/boot/gptboot");
+	size_t platlen = sizeof(platform);
+	if (strlen(platform) == 0)
+		sysctlbyname(platform_sysctl, platform, &platlen, NULL, -1);
+
+	if (strcmp(part_type, "GPT") == 0) {
+		if (strcmp(platform, "EFI") == 0)
+			return ("/boot/boot1.efifat");
+		else
+			return ("/boot/gptboot");
+	}
 	
 	/* No partcode except for GPT */
 	return (NULL);