[PATCH 15/23] Add function to retrieve ARM AArch64 hardware capabilities

[Ajeet Singh]

From: Warner Losh <i...@bsdimp.com>

The function initializes default hardware capabilities and
finds additional features using the `GET_FEATURE_ID` macro

Signed-off-by: Warner Losh <i...@bsdimp.com>
Signed-off-by: Ajeet Singh <itac...@freebsd.org>
---
 bsd-user/aarch64/target_arch_elf.h | 38 ++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/bsd-user/aarch64/target_arch_elf.h 
b/bsd-user/aarch64/target_arch_elf.h
index 41afa5a9da..ed2419408e 100644
--- a/bsd-user/aarch64/target_arch_elf.h
+++ b/bsd-user/aarch64/target_arch_elf.h
@@ -95,4 +95,42 @@ enum {
 #define GET_FEATURE_ID(feat, hwcap) \
     do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
 
+static uint32_t get_elf_hwcap(void)
+{
+    ARMCPU *cpu = ARM_CPU(thread_cpu);
+    uint32_t hwcaps = 0;
+
+    hwcaps |= ARM_HWCAP_A64_FP;
+    hwcaps |= ARM_HWCAP_A64_ASIMD;
+    hwcaps |= ARM_HWCAP_A64_CPUID;
+
+    /* probe for the extra features */
+
+    GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES);
+    GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL);
+    GET_FEATURE_ID(aa64_sha1, ARM_HWCAP_A64_SHA1);
+    GET_FEATURE_ID(aa64_sha256, ARM_HWCAP_A64_SHA2);
+    GET_FEATURE_ID(aa64_sha512, ARM_HWCAP_A64_SHA512);
+    GET_FEATURE_ID(aa64_crc32, ARM_HWCAP_A64_CRC32);
+    GET_FEATURE_ID(aa64_sha3, ARM_HWCAP_A64_SHA3);
+    GET_FEATURE_ID(aa64_sm3, ARM_HWCAP_A64_SM3);
+    GET_FEATURE_ID(aa64_sm4, ARM_HWCAP_A64_SM4);
+    GET_FEATURE_ID(aa64_fp16, ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
+    GET_FEATURE_ID(aa64_atomics, ARM_HWCAP_A64_ATOMICS);
+    GET_FEATURE_ID(aa64_rdm, ARM_HWCAP_A64_ASIMDRDM);
+    GET_FEATURE_ID(aa64_dp, ARM_HWCAP_A64_ASIMDDP);
+    GET_FEATURE_ID(aa64_fcma, ARM_HWCAP_A64_FCMA);
+    GET_FEATURE_ID(aa64_sve, ARM_HWCAP_A64_SVE);
+    GET_FEATURE_ID(aa64_pauth, ARM_HWCAP_A64_PACA | ARM_HWCAP_A64_PACG);
+    GET_FEATURE_ID(aa64_fhm, ARM_HWCAP_A64_ASIMDFHM);
+    GET_FEATURE_ID(aa64_jscvt, ARM_HWCAP_A64_JSCVT);
+    GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB);
+    GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
+    GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP);
+    GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC);
+    GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC);
+
+    return hwcaps;
+}
+
 #endif /* TARGET_ARCH_ELF_H */
-- 
2.34.1