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[Qemu-devel] [PATCH v3 24/31] target-arm: Add utility function for check
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v3 24/31] target-arm: Add utility function for checking AA32/64 state of an EL |
Date: |
Sat, 15 Feb 2014 16:07:17 +0000 |
There are various situations where we need to behave differently
depending on whether a given exception level is in AArch64 or
AArch32 state. The state of the current exception level is stored
in env->aarch64, but there's no equivalent guest-visible architected
state bits for the status of the exception levels "above" the
current one which may still affect execution. At the moment we
only support EL1 (ie no EL2 or EL3) and insist that AArch64
capable CPUs run with EL1 in AArch64 state, but these may change
in the future, so abstract out the "what state is this?" check
into a utility function which can be enhanced later if necessary.
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/cpu.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 1f6f65d..f530333 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -633,6 +633,22 @@ static inline int arm_feature(CPUARMState *env, int
feature)
return (env->features & (1ULL << feature)) != 0;
}
+/* Return true if the specified exception level is running in AArch64 state. */
+static inline bool arm_el_is_aa64(CPUARMState *env, int el)
+{
+ /* We don't currently support EL2 or EL3, and this isn't valid for EL0
+ * (if we're in EL0, is_a64() is what you want, and if we're not in EL0
+ * then the state of EL0 isn't well defined.)
+ */
+ assert(el == 1);
+ /* AArch64-capable CPUs always run with EL1 in AArch64 mode. This
+ * is a QEMU-imposed simplification which we may wish to change later.
+ * If we in future support EL2 and/or EL3, then the state of lower
+ * exception levels is controlled by the HCR.RW and SCR.RW bits.
+ */
+ return arm_feature(env, ARM_FEATURE_AARCH64);
+}
+
void arm_cpu_list(FILE *f, fprintf_function cpu_fprintf);
/* Interface between CPU and Interrupt controller. */
--
1.8.5
- [Qemu-devel] [PATCH v3 29/31] target-arm: A64: Add assertion that FP access was checked, (continued)
- [Qemu-devel] [PATCH v3 29/31] target-arm: A64: Add assertion that FP access was checked, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 13/31] target-arm: Implement AArch64 MPIDR, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 19/31] target-arm: A64: Implement WFI, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 11/31] target-arm: Implement AArch64 VBAR_EL1, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 20/31] target-arm: Store AIF bits in env->pstate for AArch32, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 09/31] target-arm: Implement AArch64 SCTLR_EL1, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 10/31] target-arm: Implement AArch64 TCR_EL1, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 12/31] target-arm: Implement AArch64 TTBR*, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 01/31] target-arm: Fix raw read and write functions on AArch64 registers, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 17/31] target-arm: Implement AArch64 OSLAR_EL1 sysreg as WI, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 24/31] target-arm: Add utility function for checking AA32/64 state of an EL,
Peter Maydell <=
- [Qemu-devel] [PATCH v3 23/31] target-arm: Implement AArch64 view of CPACR, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 22/31] target-arm: A64: Implement MSR (immediate) instructions, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 16/31] target-arm: Implement AArch64 dummy breakpoint and watchpoint registers, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 30/31] target-arm: Fix VFP enables for AArch32 EL0 under AArch64 EL1, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 28/31] target-arm: A64: Correctly fault FP/Neon if CPACR.FPEN set, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 05/31] target-arm: Implement AArch64 cache invalidate/clean ops, Peter Maydell, 2014/02/15
- [Qemu-devel] [PATCH v3 31/31] target-arm: Add v8 mmu translation support, Peter Maydell, 2014/02/15