aarch64: add cache handling functions

For now only D-Cache flush (Clean&Invalidate) and I-Cache
invalidate are implemented. That's enough for software breakpoints.

Change-Id: I8e96d645a230b51e3490403f4564e59ba6a76cf3
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>

4 files changed, 153 insertions, 1 deletions

diff --git a/src/target/Makefile.am b/src/target/Makefile.am
index c20ac0f0..0021f44d 100644
--- a/src/target/Makefile.am
+++ b/src/target/Makefile.am
@@ -76,7 +76,8 @@ ARMV7_SRC = \
 ARMV8_SRC = \
 	%D%/armv8_dpm.c \
 	%D%/aarch64.c \
-	%D%/armv8.c
+	%D%/armv8.c \
+	%D%/armv8_cache.c
 
 ARM_DEBUG_SRC = \
 	%D%/arm_dpm.c \
@@ -158,6 +159,7 @@ INTEL_IA32_SRC = \
 	%D%/armv8.h \
 	%D%/armv8_dpm.h \
 	%D%/armv8_opcodes.h \
+	%D%/armv8_cache.h \
 	%D%/avrt.h \
 	%D%/dsp563xx.h \
 	%D%/dsp563xx_once.h \
diff --git a/src/target/armv8_cache.c b/src/target/armv8_cache.c
new file mode 100644
index 00000000..fb188046
--- /dev/null
+++ b/src/target/armv8_cache.c
@@ -0,0 +1,122 @@
+/***************************************************************************
+ *   Copyright (C) 2016 by Matthias Welwarsky                              *
+ *   matthias.welwarsky@sysgo.com                                          *
+ *                                                                         *
+ *   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; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ ***************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "armv8_cache.h"
+#include "armv8_dpm.h"
+#include "armv8_opcodes.h"
+
+static int armv8_d_cache_sanity_check(struct armv8_common *armv8)
+{
+	struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
+
+	if (armv8_cache->d_u_cache_enabled)
+		return ERROR_OK;
+
+	return ERROR_TARGET_INVALID;
+}
+
+static int armv8_i_cache_sanity_check(struct armv8_common *armv8)
+{
+	struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
+
+	if (armv8_cache->i_cache_enabled)
+		return ERROR_OK;
+
+	return ERROR_TARGET_INVALID;
+}
+
+int armv8_cache_d_inner_flush_virt(struct armv8_common *armv8, target_addr_t va, size_t size)
+{
+	struct arm_dpm *dpm = armv8->arm.dpm;
+	struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
+	uint64_t linelen = armv8_cache->d_u_size.linelen;
+	target_addr_t va_line, va_end;
+	int retval;
+
+	retval = armv8_d_cache_sanity_check(armv8);
+	if (retval != ERROR_OK)
+		return retval;
+
+	retval = dpm->prepare(dpm);
+	if (retval != ERROR_OK)
+		goto done;
+
+	va_line = va & (-linelen);
+	va_end = va + size;
+
+	while (va_line < va_end) {
+		/* DC CIVAC */
+		/* Aarch32: DCCIMVAC: ARMV4_5_MCR(15, 0, 0, 7, 14, 1) */
+		retval = dpm->instr_write_data_r0_64(dpm,
+				ARMV8_SYS(SYSTEM_DCCIVAC, 0), va_line);
+		if (retval != ERROR_OK)
+			goto done;
+		va_line += linelen;
+	}
+
+	dpm->finish(dpm);
+	return retval;
+
+done:
+	LOG_ERROR("d-cache invalidate failed");
+	dpm->finish(dpm);
+
+	return retval;
+}
+
+int armv8_cache_i_inner_inval_virt(struct armv8_common *armv8, target_addr_t va, size_t size)
+{
+	struct arm_dpm *dpm = armv8->arm.dpm;
+	struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
+	uint64_t linelen = armv8_cache->i_size.linelen;
+	target_addr_t va_line, va_end;
+	int retval;
+
+	retval = armv8_i_cache_sanity_check(armv8);
+	if (retval != ERROR_OK)
+		return retval;
+
+	retval = dpm->prepare(dpm);
+	if (retval != ERROR_OK)
+		goto done;
+
+	va_line = va & (-linelen);
+	va_end = va + size;
+
+	while (va_line < va_end) {
+		/* IC IVAU - Invalidate instruction cache by VA to PoU. */
+		retval = dpm->instr_write_data_r0_64(dpm,
+				ARMV8_SYS(SYSTEM_ICIVAU, 0), va_line);
+		if (retval != ERROR_OK)
+			goto done;
+		va_line += linelen;
+	}
+
+	dpm->finish(dpm);
+	return retval;
+
+done:
+	LOG_ERROR("d-cache invalidate failed");
+	dpm->finish(dpm);
+
+	return retval;
+}
diff --git a/src/target/armv8_cache.h b/src/target/armv8_cache.h
new file mode 100644
index 00000000..fa46e16d
--- /dev/null
+++ b/src/target/armv8_cache.h
@@ -0,0 +1,26 @@
+/***************************************************************************
+ *   Copyright (C) 2016 by Matthias Welwarsky                              *
+ *   matthias.welwarsky@sysgo.com                                          *
+ *                                                                         *
+ *   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; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ ***************************************************************************/
+#ifndef OPENOCD_TARGET_ARMV8_CACHE_H_
+#define OPENOCD_TARGET_ARMV8_CACHE_H_
+
+#include "armv8.h"
+
+extern int armv8_cache_d_inner_flush_virt(struct armv8_common *armv8, target_addr_t va, size_t size);
+extern int armv8_cache_i_inner_inval_virt(struct armv8_common *armv8, target_addr_t va, size_t size);
+
+#endif /* OPENOCD_TARGET_ARMV8_CACHE_H_ */
diff --git a/src/target/armv8_opcodes.h b/src/target/armv8_opcodes.h
index a1fb5d4d..89d7440a 100644
--- a/src/target/armv8_opcodes.h
+++ b/src/target/armv8_opcodes.h
@@ -82,6 +82,7 @@
 #define SYSTEM_DCCSW			0b0100001111010010
 #define SYSTEM_ICIVAU			0b0101101110101001
 #define SYSTEM_DCCVAU			0b0101101111011001
+#define SYSTEM_DCCIVAC			0b0101101111110001
 
 #define SYSTEM_MPIDR			0b1100000000000101
 
@@ -125,5 +126,6 @@
 #define ARMV8_MOVFSP_32(Rt) (0x11000000 | (0x1f << 5) | (Rt))
 #define ARMV8_MOVTSP_32(Rt) (0x11000000 | (Rt << 5) | (0x1F))
 
+#define ARMV8_SYS(System, Rt) (0xD5080000 | ((System) << 5) | Rt)
 
 #endif /* __ARM_OPCODES_H */