Resguardo inicial

2026-09-06 12:53:21 -06:00
parent 662efe3c2a
commit ad2088d178
94853 changed files with 43200404 additions and 0 deletions
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Fast user context implementation of getcpu()
+ */
+
+#include <asm/vdso.h>
+
+static __always_inline int read_cpu_id(void)
+{
+	int cpu_id;
+
+#ifdef CONFIG_64BIT
+	__asm__ __volatile__(
+	"	rdtime.d $zero, %0\n"
+	: "=r" (cpu_id)
+	:
+	: "memory");
+#else
+	__asm__ __volatile__(
+	"	rdtimel.w $zero, %0\n"
+	: "=r" (cpu_id)
+	:
+	: "memory");
+#endif
+
+	return cpu_id;
+}
+
+extern
+int __vdso_getcpu(unsigned int *cpu, unsigned int *node, void *unused);
+int __vdso_getcpu(unsigned int *cpu, unsigned int *node, void *unused)
+{
+	int cpu_id;
+
+	cpu_id = read_cpu_id();
+
+	if (cpu)
+		*cpu = cpu_id;
+
+	if (node)
+		*node = vdso_u_arch_data.pdata[cpu_id].node;
+
+	return 0;
+}