Implement ARM Standard Service

This patch implements ARM Standard Service as a runtime service and adds
support for call count, UID and revision information SMCs. The existing
PSCI implementation is subsumed by the Standard Service calls and all
PSCI calls are therefore dispatched by the Standard Service to the PSCI
handler.

At present, PSCI is the only specification under Standard Service. Thus
call count returns the number of PSCI calls implemented. As this is the
initial implementation, a revision number of 0.1 is returned for call
revision.

Fixes ARM-software/tf-issues#62

Change-Id: I6d4273f72ad6502636efa0f872e288b191a64bc1

1 files changed, 108 insertions, 0 deletions

diff --git a/services/std_svc/std_svc_setup.c b/services/std_svc/std_svc_setup.c
new file mode 100644
index 00000000..080836ab
--- /dev/null
+++ b/services/std_svc/std_svc_setup.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 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.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+#include <stdint.h>
+#include <uuid.h>
+#include <context_mgmt.h>
+#include <runtime_svc.h>
+#include <std_svc.h>
+#include <psci.h>
+#include <psci_private.h>
+#include <debug.h>
+
+/* Standard Service UUID */
+DEFINE_SVC_UUID(arm_svc_uid,
+		0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d,
+		0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2);
+
+/* Setup Standard Services */
+static int32_t std_svc_setup(void)
+{
+	/*
+	 * PSCI is the only specification implemented as a Standard Service.
+	 * Invoke PSCI setup from here
+	 */
+	return psci_setup();
+}
+
+/*
+ * Top-level Standard Service SMC handler. This handler will in turn dispatch
+ * calls to PSCI SMC handler
+ */
+uint64_t std_svc_smc_handler(uint32_t smc_fid,
+			     uint64_t x1,
+			     uint64_t x2,
+			     uint64_t x3,
+			     uint64_t x4,
+			     void *cookie,
+			     void *handle,
+			     uint64_t flags)
+{
+	/*
+	 * Dispatch PSCI calls to PSCI SMC handler and return its return
+	 * value
+	 */
+	if (is_psci_fid(smc_fid)) {
+		return psci_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+				handle, flags);
+	}
+
+	switch (smc_fid) {
+	case ARM_STD_SVC_CALL_COUNT:
+		/*
+		 * Return the number of Standard Service Calls. PSCI is the only
+		 * standard service implemented; so return number of PSCI calls
+		 */
+		SMC_RET1(handle, PSCI_NUM_CALLS);
+
+	case ARM_STD_SVC_UID:
+		/* Return UID to the caller */
+		SMC_UUID_RET(handle, arm_svc_uid);
+
+	case ARM_STD_SVC_VERSION:
+		/* Return the version of current implementation */
+		SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR);
+
+	default:
+		WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/* Register Standard Service Calls as runtime service */
+DECLARE_RT_SVC(
+		std_svc,
+
+		OEN_STD_START,
+		OEN_STD_END,
+		SMC_TYPE_FAST,
+		std_svc_setup,
+		std_svc_smc_handler
+);