target-arm: Define names for SCTLR bits

The SCTLR is full of bits for enabling or disabling various things, and so
there are many places in the code which check if certain bits are set.
Define some named constants for the SCTLR bits so these checks are easier
to read.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 383c58221e..52894fc33e 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -337,6 +337,58 @@ int cpu_arm_handle_mmu_fault (CPUARMState *env, target_ulong address, int rw,
                               int mmu_idx);
 #define cpu_handle_mmu_fault cpu_arm_handle_mmu_fault
 
+/* SCTLR bit meanings. Several bits have been reused in newer
+ * versions of the architecture; in that case we define constants
+ * for both old and new bit meanings. Code which tests against those
+ * bits should probably check or otherwise arrange that the CPU
+ * is the architectural version it expects.
+ */
+#define SCTLR_M       (1U << 0)
+#define SCTLR_A       (1U << 1)
+#define SCTLR_C       (1U << 2)
+#define SCTLR_W       (1U << 3) /* up to v6; RAO in v7 */
+#define SCTLR_SA      (1U << 3)
+#define SCTLR_P       (1U << 4) /* up to v5; RAO in v6 and v7 */
+#define SCTLR_SA0     (1U << 4) /* v8 onward, AArch64 only */
+#define SCTLR_D       (1U << 5) /* up to v5; RAO in v6 */
+#define SCTLR_CP15BEN (1U << 5) /* v7 onward */
+#define SCTLR_L       (1U << 6) /* up to v5; RAO in v6 and v7; RAZ in v8 */
+#define SCTLR_B       (1U << 7) /* up to v6; RAZ in v7 */
+#define SCTLR_ITD     (1U << 7) /* v8 onward */
+#define SCTLR_S       (1U << 8) /* up to v6; RAZ in v7 */
+#define SCTLR_SED     (1U << 8) /* v8 onward */
+#define SCTLR_R       (1U << 9) /* up to v6; RAZ in v7 */
+#define SCTLR_UMA     (1U << 9) /* v8 onward, AArch64 only */
+#define SCTLR_F       (1U << 10) /* up to v6 */
+#define SCTLR_SW      (1U << 10) /* v7 onward */
+#define SCTLR_Z       (1U << 11)
+#define SCTLR_I       (1U << 12)
+#define SCTLR_V       (1U << 13)
+#define SCTLR_RR      (1U << 14) /* up to v7 */
+#define SCTLR_DZE     (1U << 14) /* v8 onward, AArch64 only */
+#define SCTLR_L4      (1U << 15) /* up to v6; RAZ in v7 */
+#define SCTLR_UCT     (1U << 15) /* v8 onward, AArch64 only */
+#define SCTLR_DT      (1U << 16) /* up to ??, RAO in v6 and v7 */
+#define SCTLR_nTWI    (1U << 16) /* v8 onward */
+#define SCTLR_HA      (1U << 17)
+#define SCTLR_IT      (1U << 18) /* up to ??, RAO in v6 and v7 */
+#define SCTLR_nTWE    (1U << 18) /* v8 onward */
+#define SCTLR_WXN     (1U << 19)
+#define SCTLR_ST      (1U << 20) /* up to ??, RAZ in v6 */
+#define SCTLR_UWXN    (1U << 20) /* v7 onward */
+#define SCTLR_FI      (1U << 21)
+#define SCTLR_U       (1U << 22)
+#define SCTLR_XP      (1U << 23) /* up to v6; v7 onward RAO */
+#define SCTLR_VE      (1U << 24) /* up to v7 */
+#define SCTLR_E0E     (1U << 24) /* v8 onward, AArch64 only */
+#define SCTLR_EE      (1U << 25)
+#define SCTLR_L2      (1U << 26) /* up to v6, RAZ in v7 */
+#define SCTLR_UCI     (1U << 26) /* v8 onward, AArch64 only */
+#define SCTLR_NMFI    (1U << 27)
+#define SCTLR_TRE     (1U << 28)
+#define SCTLR_AFE     (1U << 29)
+#define SCTLR_TE      (1U << 30)
+
 #define CPSR_M (0x1fU)
 #define CPSR_T (1U << 5)
 #define CPSR_F (1U << 6)