From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/ia64/include/uapi/asm/cmpxchg.h | 159 +++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 arch/ia64/include/uapi/asm/cmpxchg.h

(limited to 'arch/ia64/include/uapi/asm/cmpxchg.h')

diff --git a/arch/ia64/include/uapi/asm/cmpxchg.h b/arch/ia64/include/uapi/asm/cmpxchg.h
new file mode 100644
index 000000000..ca2e02685
--- /dev/null
+++ b/arch/ia64/include/uapi/asm/cmpxchg.h
@@ -0,0 +1,159 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_ASM_IA64_CMPXCHG_H
+#define _UAPI_ASM_IA64_CMPXCHG_H
+
+/*
+ * Compare/Exchange, forked from asm/intrinsics.h
+ * which was:
+ *
+ *	Copyright (C) 2002-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+/* include compiler specific intrinsics */
+#include <asm/ia64regs.h>
+#ifdef __INTEL_COMPILER
+# include <asm/intel_intrin.h>
+#else
+# include <asm/gcc_intrin.h>
+#endif
+
+/*
+ * This function doesn't exist, so you'll get a linker error if
+ * something tries to do an invalid xchg().
+ */
+extern void ia64_xchg_called_with_bad_pointer(void);
+
+#define __xchg(x, ptr, size)						\
+({									\
+	unsigned long __xchg_result;					\
+									\
+	switch (size) {							\
+	case 1:								\
+		__xchg_result = ia64_xchg1((__u8 __force *)ptr, x);	\
+		break;							\
+									\
+	case 2:								\
+		__xchg_result = ia64_xchg2((__u16 __force *)ptr, x);	\
+		break;							\
+									\
+	case 4:								\
+		__xchg_result = ia64_xchg4((__u32 __force *)ptr, x);	\
+		break;							\
+									\
+	case 8:								\
+		__xchg_result = ia64_xchg8((__u64 __force *)ptr, x);	\
+		break;							\
+	default:							\
+		ia64_xchg_called_with_bad_pointer();			\
+	}								\
+	(__typeof__ (*(ptr)) __force) __xchg_result;			\
+})
+
+#ifndef __KERNEL__
+#define xchg(ptr, x)							\
+({(__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)));})
+#endif
+
+/*
+ * Atomic compare and exchange.  Compare OLD with MEM, if identical,
+ * store NEW in MEM.  Return the initial value in MEM.  Success is
+ * indicated by comparing RETURN with OLD.
+ */
+
+/*
+ * This function doesn't exist, so you'll get a linker error
+ * if something tries to do an invalid cmpxchg().
+ */
+extern long ia64_cmpxchg_called_with_bad_pointer(void);
+
+#define ia64_cmpxchg(sem, ptr, old, new, size)				\
+({									\
+	__u64 _o_, _r_;							\
+									\
+	switch (size) {							\
+	case 1:								\
+		_o_ = (__u8) (long __force) (old);			\
+		break;							\
+	case 2:								\
+		_o_ = (__u16) (long __force) (old);			\
+		break;							\
+	case 4:								\
+		_o_ = (__u32) (long __force) (old);			\
+		break;							\
+	case 8:								\
+		_o_ = (__u64) (long __force) (old);			\
+		break;							\
+	default:							\
+		break;							\
+	}								\
+	switch (size) {							\
+	case 1:								\
+		_r_ = ia64_cmpxchg1_##sem((__u8 __force *) ptr, new, _o_);	\
+		break;							\
+									\
+	case 2:								\
+		_r_ = ia64_cmpxchg2_##sem((__u16 __force *) ptr, new, _o_);	\
+		break;							\
+									\
+	case 4:								\
+		_r_ = ia64_cmpxchg4_##sem((__u32 __force *) ptr, new, _o_);	\
+		break;							\
+									\
+	case 8:								\
+		_r_ = ia64_cmpxchg8_##sem((__u64 __force *) ptr, new, _o_);	\
+		break;							\
+									\
+	default:							\
+		_r_ = ia64_cmpxchg_called_with_bad_pointer();		\
+		break;							\
+	}								\
+	(__typeof__(old) __force) _r_;					\
+})
+
+#define cmpxchg_acq(ptr, o, n)	\
+	ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
+#define cmpxchg_rel(ptr, o, n)	\
+	ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
+
+/*
+ * Worse still - early processor implementations actually just ignored
+ * the acquire/release and did a full fence all the time.  Unfortunately
+ * this meant a lot of badly written code that used .acq when they really
+ * wanted .rel became legacy out in the wild - so when we made a cpu
+ * that strictly did the .acq or .rel ... all that code started breaking - so
+ * we had to back-pedal and keep the "legacy" behavior of a full fence :-(
+ */
+
+#ifndef __KERNEL__
+/* for compatibility with other platforms: */
+#define cmpxchg(ptr, o, n)	cmpxchg_acq((ptr), (o), (n))
+#define cmpxchg64(ptr, o, n)	cmpxchg_acq((ptr), (o), (n))
+
+#define cmpxchg_local		cmpxchg
+#define cmpxchg64_local		cmpxchg64
+#endif
+
+#ifdef CONFIG_IA64_DEBUG_CMPXCHG
+# define CMPXCHG_BUGCHECK_DECL	int _cmpxchg_bugcheck_count = 128;
+# define CMPXCHG_BUGCHECK(v)						\
+do {									\
+	if (_cmpxchg_bugcheck_count-- <= 0) {				\
+		void *ip;						\
+		extern int _printk(const char *fmt, ...);		\
+		ip = (void *) ia64_getreg(_IA64_REG_IP);		\
+		_printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
+		break;							\
+	}								\
+} while (0)
+#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
+# define CMPXCHG_BUGCHECK_DECL
+# define CMPXCHG_BUGCHECK(v)
+#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _UAPI_ASM_IA64_CMPXCHG_H */
-- 
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