riscv: update mtime initialization

Add a interface, which is implemented by SoC.

Change-Id: I5524732f6eb3841e43afd176644119b03b5e5e27
Signed-off-by: Xiang Wang <wxjstz@126.com>
Reviewed-on: https://review.coreboot.org/28372
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>

src/arch/riscv/include/mcall.h

@@ -61,6 +61,9 @@ typedef struct {
 
 void hls_init(uint32_t hart_id); // need to call this before launching linux
 
+/* This function is used to initialize HLS()->time/HLS()->timecmp  */
+void mtime_init(void);
+
 #endif // __ASSEMBLER__
 
 #endif

src/arch/riscv/mcall.c

@@ -40,9 +40,7 @@ void hls_init(uint32_t hart_id)
 	memset(HLS(), 0, sizeof(*HLS()));
 	HLS()->hart_id = hart_id;
 
-	/* Initialize these pointers with dummy values, for now */
-	HLS()->time = NULL;
-	HLS()->timecmp = NULL;
+	mtime_init();
 
 	printk(BIOS_SPEW, "Time is %p and timecmp is %p\n",
 	       HLS()->time, HLS()->timecmp);

src/soc/lowrisc/lowrisc/Makefile.inc

@@ -1,5 +1,6 @@
 ifeq ($(CONFIG_SOC_LOWRISC_LOWRISC),y)
 
+bootblock-y += mtime.c
 romstage-y += cbmem.c
 ramstage-y += cbmem.c
 

src/soc/lowrisc/lowrisc/mtime.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 HardenedLinux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <mcall.h>
+
+/* FIXME: This is an empty implementation, please improve */
+/* This function is used to initialize HLS()->time/HLS()->timecmp  */
+void mtime_init(void)
+{
+}

src/soc/sifive/fu540/Makefile.inc

@@ -14,6 +14,7 @@
 ifeq ($(CONFIG_SOC_SIFIVE_FU540),y)
 
 bootblock-y += uart.c
+bootblock-y += mtime.c
 bootblock-y += media.c
 bootblock-y += bootblock.c
 

src/soc/sifive/fu540/mtime.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 HardenedLinux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <mcall.h>
+
+/* FIXME: This is an empty implementation, please improve */
+/* This function is used to initialize HLS()->time/HLS()->timecmp  */
+void mtime_init(void)
+{
+}

src/soc/ucb/riscv/Makefile.inc

@@ -1,5 +1,6 @@
 ifeq ($(CONFIG_SOC_UCB_RISCV),y)
 
+bootblock-y += mtime.c
 romstage-y += cbmem.c
 ramstage-y += cbmem.c
 

src/soc/ucb/riscv/mtime.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 HardenedLinux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <mcall.h>
+
+/* FIXME: This is an empty implementation, please improve */
+/* This function is used to initialize HLS()->time/HLS()->timecmp  */
+void mtime_init(void)
+{
+}