1 files changed, 63 insertions, 0 deletions
diff --git a/arch/x86/include/asm/uaccess_32.h b/arch/x86/include/asm/uaccess_32.h
new file mode 100644
index 000000000..ba2dc1930
--- /dev/null
+++ b/arch/x86/include/asm/uaccess_32.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_UACCESS_32_H
+#define _ASM_X86_UACCESS_32_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/string.h>
+#include <asm/asm.h>
+#include <asm/page.h>
+
+unsigned long __must_check __copy_user_ll
+		(void *to, const void *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nocache_nozero
+		(void *to, const void __user *from, unsigned long n);
+
+static __always_inline unsigned long __must_check
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return __copy_user_ll((__force void *)to, from, n);
+}
+
+static __always_inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	if (__builtin_constant_p(n)) {
+		unsigned long ret;
+
+		switch (n) {
+		case 1:
+			ret = 0;
+			__uaccess_begin_nospec();
+			__get_user_asm_nozero(*(u8 *)to, from, ret,
+					      "b", "b", "=q", 1);
+			__uaccess_end();
+			return ret;
+		case 2:
+			ret = 0;
+			__uaccess_begin_nospec();
+			__get_user_asm_nozero(*(u16 *)to, from, ret,
+					      "w", "w", "=r", 2);
+			__uaccess_end();
+			return ret;
+		case 4:
+			ret = 0;
+			__uaccess_begin_nospec();
+			__get_user_asm_nozero(*(u32 *)to, from, ret,
+					      "l", "k", "=r", 4);
+			__uaccess_end();
+			return ret;
+		}
+	}
+	return __copy_user_ll(to, (__force const void *)from, n);
+}
+
+static __always_inline unsigned long
+__copy_from_user_inatomic_nocache(void *to, const void __user *from,
+				  unsigned long n)
+{
+       return __copy_from_user_ll_nocache_nozero(to, from, n);
+}
+
+#endif /* _ASM_X86_UACCESS_32_H */