sgi-xp: support getting the address of a partition's reserved page

Add support for getting the address of a partition's reserved page.
Signed-off-by: NDean Nelson <dcn@sgi.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

drivers/misc/sgi-xp/xpc_uv.c

@@ -642,7 +642,7 @@ xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
 	struct xpc_partition_uv *part_uv = &part->sn.uv;
 
 	/*
-	 * !!! Make our side think that the remote parition sent an activate
+	 * !!! Make our side think that the remote partition sent an activate
 	 * !!! message our way by doing what the activate IRQ handler would
 	 * !!! do had one really been sent.
 	 */
@@ -660,8 +660,33 @@ static enum xp_retval
 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
 				  size_t *len)
 {
-	/* !!! call the UV version of sn_partition_reserved_page_pa() */
-	return xpUnsupported;
+	s64 status;
+	enum xp_retval ret;
+
+#if defined CONFIG_X86_64
+	status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
+					  (u64 *)len);
+	if (status == BIOS_STATUS_SUCCESS)
+		ret = xpSuccess;
+	else if (status == BIOS_STATUS_MORE_PASSES)
+		ret = xpNeedMoreInfo;
+	else
+		ret = xpBiosError;
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+	status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
+	if (status == SALRET_OK)
+		ret = xpSuccess;
+	else if (status == SALRET_MORE_PASSES)
+		ret = xpNeedMoreInfo;
+	else
+		ret = xpSalError;
+
+#else
+	#error not a supported configuration
+#endif
+
+	return ret;
 }
 
 static int