From 2b56f4f656e11f50d124e13e6d66a967ca45d373 Mon Sep 17 00:00:00 2001
From: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Date: Thu, 6 Oct 2016 15:05:53 +0200
Subject: aarch64: provide virt2phys command

Use AT commands to translate virtual to physical addresses based on
current MMU configuration.

Change-Id: I1bbd7d674c435541b617b17022fa9f7f0f01bdab
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
---
 src/target/aarch64.c       |  2 +-
 src/target/armv8.c         | 78 +++++++++++++++++++++++++++++++++++++++++++++-
 src/target/armv8.h         |  4 +++
 src/target/armv8_opcodes.h |  7 +++++
 4 files changed, 89 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/target/aarch64.c b/src/target/aarch64.c
index f818344..3510db2 100644
--- a/src/target/aarch64.c
+++ b/src/target/aarch64.c
@@ -2011,7 +2011,7 @@ static int aarch64_mmu(struct target *target, int *enabled)
 static int aarch64_virt2phys(struct target *target, target_addr_t virt,
 			     target_addr_t *phys)
 {
-	return armv8_mmu_translate_va(target, virt, phys);
+	return armv8_mmu_translate_va_pa(target, virt, phys, 1);
 }
 
 COMMAND_HANDLER(aarch64_handle_cache_info_command)
diff --git a/src/target/armv8.c b/src/target/armv8.c
index d644963..3f3127e 100644
--- a/src/target/armv8.c
+++ b/src/target/armv8.c
@@ -529,7 +529,83 @@ int armv8_mmu_translate_va(struct target *target,  target_addr_t va, target_addr
 int armv8_mmu_translate_va_pa(struct target *target, target_addr_t va,
 	target_addr_t *val, int meminfo)
 {
-	return ERROR_OK;
+	struct armv8_common *armv8 = target_to_armv8(target);
+	struct arm *arm = target_to_arm(target);
+	struct arm_dpm *dpm = &armv8->dpm;
+	uint32_t retval;
+	uint32_t instr = 0;
+	uint64_t par;
+
+	static const char * const shared_name[] = {
+			"Non-", "UNDEFINED ", "Outer ", "Inner "
+	};
+
+	static const char * const secure_name[] = {
+			"Secure", "Not Secure"
+	};
+
+	retval = dpm->prepare(dpm);
+	if (retval != ERROR_OK)
+		return retval;
+
+	switch (armv8_curel_from_core_mode(arm)) {
+	case SYSTEM_CUREL_EL0:
+		instr = ARMV8_SYS(SYSTEM_ATS12E0R, 0);
+		/* can only execute instruction at EL2 */
+		dpmv8_modeswitch(dpm, ARMV8_64_EL2T);
+		break;
+	case SYSTEM_CUREL_EL1:
+		instr = ARMV8_SYS(SYSTEM_ATS12E1R, 0);
+		/* can only execute instruction at EL2 */
+		dpmv8_modeswitch(dpm, ARMV8_64_EL2T);
+		break;
+	case SYSTEM_CUREL_EL2:
+		instr = ARMV8_SYS(SYSTEM_ATS1E2R, 0);
+		break;
+	case SYSTEM_CUREL_EL3:
+		instr = ARMV8_SYS(SYSTEM_ATS1E3R, 0);
+		break;
+
+	default:
+		break;
+	};
+
+	/* write VA to R0 and execute translation instruction */
+	retval = dpm->instr_write_data_r0_64(dpm, instr, (uint64_t)va);
+	/* read result from PAR_EL1 */
+	if (retval == ERROR_OK)
+		retval = dpm->instr_read_data_r0_64(dpm, ARMV8_MRS(SYSTEM_PAR_EL1, 0), &par);
+
+	dpm->finish(dpm);
+
+	/* switch back to saved PE mode */
+	dpmv8_modeswitch(dpm, ARM_MODE_ANY);
+
+	if (retval != ERROR_OK)
+		return retval;
+
+	if (par & 1) {
+		LOG_ERROR("Address translation failed at stage %i, FST=%x, PTW=%i",
+				((int)(par >> 9) & 1)+1, (int)(par >> 1) & 0x3f, (int)(par >> 8) & 1);
+
+		*val = 0;
+		retval = ERROR_FAIL;
+	} else {
+		*val = (par & 0xFFFFFFFFF000UL) | (va & 0xFFF);
+		if (meminfo) {
+			int SH = (par >> 7) & 3;
+			int NS = (par >> 9) & 1;
+			int ATTR = (par >> 56) & 0xFF;
+
+			char *memtype = (ATTR & 0xF0) == 0 ? "Device Memory" : "Normal Memory";
+
+			LOG_USER("%sshareable, %s",
+					shared_name[SH], secure_name[NS]);
+			LOG_USER("%s", memtype);
+		}
+	}
+
+	return retval;
 }
 
 int armv8_handle_cache_info_command(struct command_context *cmd_ctx,
diff --git a/src/target/armv8.h b/src/target/armv8.h
index 07e3b41..497e482 100644
--- a/src/target/armv8.h
+++ b/src/target/armv8.h
@@ -270,6 +270,10 @@ int armv8_handle_cache_info_command(struct command_context *cmd_ctx,
 
 void armv8_set_cpsr(struct arm *arm, uint32_t cpsr);
 
+static inline int armv8_curel_from_core_mode(struct arm *arm)
+{
+	return (arm->core_mode >> 6) & 3;
+}
 extern const struct command_registration armv8_command_handlers[];
 
 #endif
diff --git a/src/target/armv8_opcodes.h b/src/target/armv8_opcodes.h
index 51dc15a..41abe04 100644
--- a/src/target/armv8_opcodes.h
+++ b/src/target/armv8_opcodes.h
@@ -96,6 +96,13 @@
 #define SYSTEM_TTBR0_EL3		0b1111000100000000
 #define SYSTEM_TTBR1_EL1		0b1100000100000001
 
+/* ARMv8 address translation */
+#define SYSTEM_PAR_EL1			0b1100001110100000
+#define SYSTEM_ATS12E0R			0b0110001111000110
+#define SYSTEM_ATS12E1R			0b0110001111000100
+#define SYSTEM_ATS1E2R			0b0110001111000000
+#define SYSTEM_ATS1E3R			0b0111001111000000
+
 #define ARMV8_MRS_DSPSR(Rt)	(0xd53b4500 | (Rt))
 #define ARMV8_MSR_DSPSR(Rt)	(0xd51b4500 | (Rt))
 #define ARMV8_MRS_DLR(Rt)	(0xd53b4520 | (Rt))
-- 
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