sys/info: add feature detection for Darwin and Linux ARM

core/sys/info/cpu_linux_arm.odin

@@ -0,0 +1,65 @@
+//+build arm32, arm64
+//+build linux
+package sysinfo
+
+import "core:sys/linux"
+import "core:strings"
+
+@(init, private)
+init_cpu_features :: proc() {
+	fd, err := linux.open("/proc/cpuinfo", {})
+	if err != .NONE { return }
+	defer linux.close(fd)
+
+	// This is probably enough right?
+	buf: [4096]byte
+	n, rerr := linux.read(fd, buf[:])
+	if rerr != .NONE || n == 0 { return }
+
+	features: CPU_Features
+	defer cpu_features = features
+
+	str := string(buf[:n])
+	for line in strings.split_lines_iterator(&str) {
+		key, _, value := strings.partition(line, ":")
+		key   = strings.trim_space(key)
+		value = strings.trim_space(value)
+
+		if key != "Features" { continue }
+
+		for feature in strings.split_by_byte_iterator(&value, ' ') {
+			switch feature {
+			case "asimd", "neon": features += { .asimd }
+			case "fp":            features += { .floatingpoint }
+			case "asimdhp":       features += { .asimdhp }
+			case "asimdbf16":     features += { .bf16 }
+			case "fcma":          features += { .fcma }
+			case "asimdfhm":      features += { .fhm }
+			case "fphp", "half":  features += { .fp16 }
+			case "frint":         features += { .frint }
+			case "i8mm":          features += { .i8mm }
+			case "jscvt":         features += { .jscvt }
+			case "asimdrdm":      features += { .rdm }
+
+			case "flagm":  features += { .flagm }
+			case "flagm2": features += { .flagm2 }
+			case "crc32":  features += { .crc32 }
+
+			case "atomics": features += { .lse }
+			case "lrcpc":   features += { .lrcpc }
+			case "ilrcpc":  features += { .lrcpc2 }
+
+			case "aes":    features += { .aes }
+			case "pmull":  features += { .pmull }
+			case "sha1":   features += { .sha1 }
+			case "sha2":   features += { .sha256 }
+			case "sha3":   features += { .sha3 }
+			case "sha512": features += { .sha512 }
+
+			case "sb":   features += { .sb }
+			case "ssbs": features += { .ssbs }
+			}
+		}
+		break
+	}
+}