| /* 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> |
| #include <asm/gcc_intrin.h> |
| |
| /* |
| * 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 __arch_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))) __arch_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 |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* _UAPI_ASM_IA64_CMPXCHG_H */ |