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Message-ID: <20241028160917.1380714-3-alexander.shishkin@linux.intel.com>
Date: Mon, 28 Oct 2024 18:07:50 +0200
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
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"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Ard Biesheuvel <ardb@...nel.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
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Tony Luck <tony.luck@...el.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Alexey Kardashevskiy <aik@....com>
Cc: Jonathan Corbet <corbet@....net>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Sohil Mehta <sohil.mehta@...el.com>,
Ingo Molnar <mingo@...nel.org>,
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Subject: [PATCH v5 02/16] x86/asm: Introduce inline memcpy and memset
From: Peter Zijlstra <peterz@...radead.org>
Provide inline memcpy and memset functions that can be used instead of
the GCC builtins whenever necessary.
Originally-by: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/lkml/Y759AJ%2F0N9fqwDED@hirez.programming.kicks-ass.net/
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
arch/x86/include/asm/string.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/x86/include/asm/string.h b/arch/x86/include/asm/string.h
index c3c2c1914d65..9cb5aae7fba9 100644
--- a/arch/x86/include/asm/string.h
+++ b/arch/x86/include/asm/string.h
@@ -1,6 +1,32 @@
/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_STRING_H
+#define _ASM_X86_STRING_H
+
#ifdef CONFIG_X86_32
# include <asm/string_32.h>
#else
# include <asm/string_64.h>
#endif
+
+static __always_inline void *__inline_memcpy(void *to, const void *from, size_t len)
+{
+ void *ret = to;
+
+ asm volatile("rep movsb"
+ : "+D" (to), "+S" (from), "+c" (len)
+ : : "memory");
+ return ret;
+}
+
+static __always_inline void *__inline_memset(void *s, int v, size_t n)
+{
+ void *ret = s;
+
+ asm volatile("rep stosb"
+ : "+D" (s), "+c" (n)
+ : "a" ((uint8_t)v)
+ : "memory");
+ return ret;
+}
+
+#endif /* _ASM_X86_STRING_H */
--
2.45.2
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