[PATCH v2 06/28] arm64/sve: System register and exception syndrome definitions

[Dave Martin <Dave.Martin@arm.com>]

The SVE architecture adds some system registers, ID register fields
and a dedicated ESR exception class.

This patch adds the appropriate definitions that will be needed by
the kernel.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Cc: Alex Bennée <alex.bennee@linaro.org>

---

Changes since v1
----------------

Requested by Alex Bennée:

* Add comments to clarify CPACR_EL1_ZEN_ELxEN bit meanings.
* Add comment clarifying the status of the LEN field expansion bits.
---
 arch/arm64/include/asm/esr.h     |  3 ++-
 arch/arm64/include/asm/kvm_arm.h |  1 +
 arch/arm64/include/asm/sysreg.h  | 21 +++++++++++++++++++++
 arch/arm64/kernel/traps.c        |  1 +
 4 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index 66ed8b6..014d7d8 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -43,7 +43,8 @@
 #define ESR_ELx_EC_HVC64	(0x16)
 #define ESR_ELx_EC_SMC64	(0x17)
 #define ESR_ELx_EC_SYS64	(0x18)
-/* Unallocated EC: 0x19 - 0x1E */
+#define ESR_ELx_EC_SVE		(0x19)
+/* Unallocated EC: 0x1A - 0x1E */
 #define ESR_ELx_EC_IMP_DEF	(0x1f)
 #define ESR_ELx_EC_IABT_LOW	(0x20)
 #define ESR_ELx_EC_IABT_CUR	(0x21)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 61d694c..dbf0537 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -185,6 +185,7 @@
 #define CPTR_EL2_TCPAC	(1 << 31)
 #define CPTR_EL2_TTA	(1 << 20)
 #define CPTR_EL2_TFP	(1 << CPTR_EL2_TFP_SHIFT)
+#define CPTR_EL2_TZ	(1 << 8)
 #define CPTR_EL2_DEFAULT	0x000033ff
 
 /* Hyp Debug Configuration Register bits */
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 480ecd6..36fe2ae 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -145,6 +145,7 @@
 
 #define SYS_ID_AA64PFR0_EL1		sys_reg(3, 0, 0, 4, 0)
 #define SYS_ID_AA64PFR1_EL1		sys_reg(3, 0, 0, 4, 1)
+#define SYS_ID_AA64ZFR0_EL1		sys_reg(3, 0, 0, 4, 4)
 
 #define SYS_ID_AA64DFR0_EL1		sys_reg(3, 0, 0, 5, 0)
 #define SYS_ID_AA64DFR1_EL1		sys_reg(3, 0, 0, 5, 1)
@@ -163,6 +164,8 @@
 #define SYS_ACTLR_EL1			sys_reg(3, 0, 1, 0, 1)
 #define SYS_CPACR_EL1			sys_reg(3, 0, 1, 0, 2)
 
+#define SYS_ZCR_EL1			sys_reg(3, 0, 1, 2, 0)
+
 #define SYS_TTBR0_EL1			sys_reg(3, 0, 2, 0, 0)
 #define SYS_TTBR1_EL1			sys_reg(3, 0, 2, 0, 1)
 #define SYS_TCR_EL1			sys_reg(3, 0, 2, 0, 2)
@@ -253,6 +256,8 @@
 
 #define SYS_PMCCFILTR_EL0		sys_reg (3, 3, 14, 15, 7)
 
+#define SYS_ZCR_EL2			sys_reg(3, 4, 1, 2, 0)
+
 #define SYS_DACR32_EL2			sys_reg(3, 4, 3, 0, 0)
 #define SYS_IFSR32_EL2			sys_reg(3, 4, 5, 0, 1)
 #define SYS_FPEXC32_EL2			sys_reg(3, 4, 5, 3, 0)
@@ -335,6 +340,7 @@
 #define ID_AA64ISAR1_DPB_SHIFT		0
 
 /* id_aa64pfr0 */
+#define ID_AA64PFR0_SVE_SHIFT		32
 #define ID_AA64PFR0_GIC_SHIFT		24
 #define ID_AA64PFR0_ASIMD_SHIFT		20
 #define ID_AA64PFR0_FP_SHIFT		16
@@ -343,6 +349,7 @@
 #define ID_AA64PFR0_EL1_SHIFT		4
 #define ID_AA64PFR0_EL0_SHIFT		0
 
+#define ID_AA64PFR0_SVE			0x1
 #define ID_AA64PFR0_FP_NI		0xf
 #define ID_AA64PFR0_FP_SUPPORTED	0x0
 #define ID_AA64PFR0_ASIMD_NI		0xf
@@ -444,6 +451,20 @@
 #endif
 
 
+/*
+ * The ZCR_ELx_LEN_* definitions intentionally include bits [8:4] which
+ * are reserved by the SVE architecture for future expansion of the LEN
+ * field, with compatible semantics.
+ */
+#define ZCR_ELx_LEN_SHIFT	0
+#define ZCR_ELx_LEN_SIZE	9
+#define ZCR_ELx_LEN_MASK	0x1ff
+
+#define CPACR_EL1_ZEN_EL1EN	(1 << 16) /* enable EL1 access */
+#define CPACR_EL1_ZEN_EL0EN	(1 << 17) /* enable EL0 access, if EL1EN set */
+#define CPACR_EL1_ZEN		(CPACR_EL1_ZEN_EL1EN | CPACR_EL1_ZEN_EL0EN)
+
+
 /* Safe value for MPIDR_EL1: Bit31:RES1, Bit30:U:0, Bit24:MT:0 */
 #define SYS_MPIDR_SAFE_VAL		(1UL << 31)
 
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 5ea4b85..f202932 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -603,6 +603,7 @@ static const char *esr_class_str[] = {
 	[ESR_ELx_EC_HVC64]		= "HVC (AArch64)",
 	[ESR_ELx_EC_SMC64]		= "SMC (AArch64)",
 	[ESR_ELx_EC_SYS64]		= "MSR/MRS (AArch64)",
+	[ESR_ELx_EC_SVE]		= "SVE",
 	[ESR_ELx_EC_IMP_DEF]		= "EL3 IMP DEF",
 	[ESR_ELx_EC_IABT_LOW]		= "IABT (lower EL)",
 	[ESR_ELx_EC_IABT_CUR]		= "IABT (current EL)",
-- 
2.1.4