target/arm: properly document FEAT_CRC32

This is a mandatory feature for Armv8.1 architectures but we don't state the feature clearly in our emulation list. Also include FEAT_CRC32 comment in aarch64_max_tcg_initfn for ease of grepping. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20230824075406.1515566-1-alex.bennee@linaro.org Cc: qemu-stable@nongnu.org Message-Id: <20230222110104.3996971-1-alex.bennee@linaro.org> [PMM: pluralize 'instructions' in docs] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> (cherry picked from commit 9e771a2) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
qemu · Sep 21, 2023 · 645b87f · 645b87f
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diff --git a/docs/system/arm/emulation.rst b/docs/system/arm/emulation.rst
@@ -14,6 +14,7 @@ the following architecture extensions:
 - FEAT_BBM at level 2 (Translation table break-before-make levels)
 - FEAT_BF16 (AArch64 BFloat16 instructions)
 - FEAT_BTI (Branch Target Identification)
+- FEAT_CRC32 (CRC32 instructions)
 - FEAT_CSV2 (Cache speculation variant 2)
 - FEAT_CSV2_1p1 (Cache speculation variant 2, version 1.1)
 - FEAT_CSV2_1p2 (Cache speculation variant 2, version 1.2)

diff --git a/target/arm/tcg/cpu64.c b/target/arm/tcg/cpu64.c
@@ -743,7 +743,7 @@ void aarch64_max_tcg_initfn(Object *obj)
     t = FIELD_DP64(t, ID_AA64ISAR0, AES, 2);      /* FEAT_PMULL */
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA1, 1);     /* FEAT_SHA1 */
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA2, 2);     /* FEAT_SHA512 */
-    t = FIELD_DP64(t, ID_AA64ISAR0, CRC32, 1);
+    t = FIELD_DP64(t, ID_AA64ISAR0, CRC32, 1);    /* FEAT_CRC32 */
     t = FIELD_DP64(t, ID_AA64ISAR0, ATOMIC, 2);   /* FEAT_LSE */
     t = FIELD_DP64(t, ID_AA64ISAR0, RDM, 1);      /* FEAT_RDM */
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA3, 1);     /* FEAT_SHA3 */