Squashed 'externals/oaknut/' changes from c24f918e5..d0488d932

d0488d932 oaknut: 2.0.0
40ad78bbf oaknut: Implement DualCodeBlock and related support
9f131cfb5 oaknut: add configuration for standalone installation
69799b43c oaknut: Test building for Android on CI
1d51f5512 oaknut: 1.2.2
918bd94f0 oaknut: Eliminate -Wconversion warnings
316d8869e oaknut: Fix edgecases in MOVP2R on +/-4GiB boundary
d8634eaa1 oaknut: Fix page boundary error in ADP
d0ca9a24e oaknut: Update README examples for CPU feature detection
dbeec268b oaknut: feature_detection_freebsd: Warn about incompatibility with earlier FreeBSD versions
86e5386e2 oaknut: feature_detect: Support NetBSD
df4cf2d48 oaknut: feature_detect: Support OpenBSD
99dfff25a oaknut: feature_detection: Read ID registers
319b3d2c9 oaknut: Add basic CPU feature detection
23e9ddb4c oaknut: CI: Don't run slow tests on OpenBSD
734f1bdb4 oaknut: CI: Use up-to-date qemu
f462c9774 oaknut: CI: Build on OpenBSD
19cd42204 oaknut: code_block: Add NetBSD and OpenBSD support
18b86a3ec oaknut: SystemReg: Add more EL0 accessible registers
53c43bf0c oaknut/tests: Reduce iterations for MOVP2R
cc37df19e oaknut: Test on FreeBSD
a66b32d26 oaknut: Fix crossing sign boundary in PageOffset
206468d72 oaknut: CI: Add macos-arm64 build
e6eecc3f9 oaknut: 1.2.1
4252d8f4a oaknut: CMakeLists: Warnings are errors on MSVC
408eed65f oaknut: arm64_encode_helpers: remove unreachable code
bfc8eedfb oaknut: arm64_encode_helpers: p maybe unused
ff4456eca oaknut: Avoid negation of unsigned values
b4ac8fd6c oaknut: Fix MOV for applications of MOVN
0575cadc4 oaknut: Disable certain functionality where absolute addressing is not available
394a3c8f0 oaknut: Appease MSVC
011183670 oaknut: 1.2.0
e83c9f327 oaknut: Add VectorCodeGenerator
5eb122cc5 oaknut: Tidy up public header
45c5a7b25 oaknut: Fix clang-format errors
36243256f oaknut: Add `const` qualifier to `AddrOffset` ctor
4af500cb5 oaknut: Add `ptr` accessor to `Label`
bccb06669 oaknut: CodeGenerator const correctness
da0590a86 oaknut: github: Update package repositories

git-subtree-dir: externals/oaknut
git-subtree-split: d0488d9320ae673167dd9117223e3453d5ff102f

1 files changed, 81 insertions, 0 deletions

diff --git a/include/oaknut/feature_detection/feature_detection_netbsd.hpp b/include/oaknut/feature_detection/feature_detection_netbsd.hpp
new file mode 100644
index 00000000..cdb1deb1
--- /dev/null
+++ b/include/oaknut/feature_detection/feature_detection_netbsd.hpp
@@ -0,0 +1,81 @@
+// SPDX-FileCopyrightText: Copyright (c) 2023 merryhime <https://mary.rs>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+#include <string>
+
+#include <aarch64/armreg.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include "oaknut/feature_detection/cpu_feature.hpp"
+#include "oaknut/feature_detection/feature_detection_hwcaps.hpp"
+#include "oaknut/feature_detection/feature_detection_idregs.hpp"
+#include "oaknut/feature_detection/id_registers.hpp"
+
+namespace oaknut {
+
+inline std::optional<id::IdRegisters> read_id_registers(std::size_t core_index)
+{
+    const std::string path = "machdep.cpu" + std::to_string(core_index) + ".cpu_id";
+
+    aarch64_sysctl_cpu_id id;
+    std::size_t id_len = sizeof id;
+
+    if (sysctlbyname(path.c_str(), &id, &id_len, nullptr, 0) < 0)
+        return std::nullopt;
+
+    return id::IdRegisters{
+        id.ac_midr,
+        id::Pfr0Register{id.ac_aa64pfr0},
+        id::Pfr1Register{id.ac_aa64pfr1},
+        id::Pfr2Register{0},
+        id::Zfr0Register{id.ac_aa64zfr0},
+        id::Smfr0Register{0},
+        id::Isar0Register{id.ac_aa64isar0},
+        id::Isar1Register{id.ac_aa64isar1},
+        id::Isar2Register{0},
+        id::Isar3Register{0},
+        id::Mmfr0Register{id.ac_aa64mmfr0},
+        id::Mmfr1Register{id.ac_aa64mmfr1},
+        id::Mmfr2Register{id.ac_aa64mmfr2},
+        id::Mmfr3Register{0},
+        id::Mmfr4Register{0},
+    };
+}
+
+inline std::size_t get_core_count()
+{
+    int result = 0;
+    size_t result_size = sizeof(result);
+    const std::array<int, 2> mib{CTL_HW, HW_NCPU};
+    if (sysctl(mib.data(), mib.size(), &result, &result_size, nullptr, 0) < 0)
+        return 0;
+    return result;
+}
+
+inline CpuFeatures detect_features()
+{
+    std::optional<CpuFeatures> result;
+
+    const std::size_t core_count = get_core_count();
+    for (std::size_t core_index = 0; core_index < core_count; core_index++) {
+        if (const std::optional<id::IdRegisters> id_regs = read_id_registers(core_index)) {
+            const CpuFeatures current_features = detect_features_via_id_registers(*id_regs);
+            if (result) {
+                result = *result & current_features;
+            } else {
+                result = current_features;
+            }
+        }
+    }
+
+    return result.value_or(CpuFeatures{});
+}
+
+}  // namespace oaknut