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11/17/2022 06:42:15 AM
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Kbuild
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asm-offsets.h
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atomic.h
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atomic_defs.h
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checksum.h
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cmpxchg.h
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cpu-irqs.h
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hardirq.h
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hw_irq.h
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local64.h
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math-emu.h
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string.h
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switch_to.h
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syscall.h
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tlbflush.h
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topology.h
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types.h
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uaccess.h
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ucontext.h
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unaligned.h
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unistd.h
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user.h
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vga.h
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xor.h
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Editing: cmpxchg.h
Close
/* xchg and cmpxchg operation emulation for FR-V * * For an explanation of how atomic ops work in this arch, see: * Documentation/frv/atomic-ops.txt * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_CMPXCHG_H #define _ASM_CMPXCHG_H #include <linux/types.h> /*****************************************************************************/ /* * exchange value with memory */ extern uint64_t __xchg_64(uint64_t i, volatile void *v); #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS #define xchg(ptr, x) \ ({ \ __typeof__(ptr) __xg_ptr = (ptr); \ __typeof__(*(ptr)) __xg_orig; \ \ switch (sizeof(__xg_orig)) { \ case 4: \ asm volatile( \ "swap%I0 %M0,%1" \ : "+m"(*__xg_ptr), "=r"(__xg_orig) \ : "1"(x) \ : "memory" \ ); \ break; \ \ default: \ __xg_orig = (__typeof__(__xg_orig))0; \ asm volatile("break"); \ break; \ } \ \ __xg_orig; \ }) #else extern uint32_t __xchg_32(uint32_t i, volatile void *v); #define xchg(ptr, x) \ ({ \ __typeof__(ptr) __xg_ptr = (ptr); \ __typeof__(*(ptr)) __xg_orig; \ \ switch (sizeof(__xg_orig)) { \ case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr); break; \ default: \ __xg_orig = (__typeof__(__xg_orig))0; \ asm volatile("break"); \ break; \ } \ __xg_orig; \ }) #endif /*****************************************************************************/ /* * compare and conditionally exchange value with memory * - if (*ptr == test) then orig = *ptr; *ptr = test; * - if (*ptr != test) then orig = *ptr; */ extern uint64_t __cmpxchg_64(uint64_t test, uint64_t new, volatile uint64_t *v); #define cmpxchg64(p, o, n) __cmpxchg_64((o), (n), (p)) #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS #define cmpxchg(ptr, test, new) \ ({ \ __typeof__(ptr) __xg_ptr = (ptr); \ __typeof__(*(ptr)) __xg_orig, __xg_tmp; \ __typeof__(*(ptr)) __xg_test = (test); \ __typeof__(*(ptr)) __xg_new = (new); \ \ switch (sizeof(__xg_orig)) { \ case 4: \ asm volatile( \ "0: \n" \ " orcc gr0,gr0,gr0,icc3 \n" \ " ckeq icc3,cc7 \n" \ " ld.p %M0,%1 \n" \ " orcr cc7,cc7,cc3 \n" \ " sub%I4cc %1,%4,%2,icc0 \n" \ " bne icc0,#0,1f \n" \ " cst.p %3,%M0 ,cc3,#1 \n" \ " corcc gr29,gr29,gr0 ,cc3,#1 \n" \ " beq icc3,#0,0b \n" \ "1: \n" \ : "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp) \ : "r"(__xg_new), "NPr"(__xg_test) \ : "memory", "cc7", "cc3", "icc3", "icc0" \ ); \ break; \ \ default: \ __xg_orig = (__typeof__(__xg_orig))0; \ asm volatile("break"); \ break; \ } \ \ __xg_orig; \ }) #else extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new); #define cmpxchg(ptr, test, new) \ ({ \ __typeof__(ptr) __xg_ptr = (ptr); \ __typeof__(*(ptr)) __xg_orig; \ __typeof__(*(ptr)) __xg_test = (test); \ __typeof__(*(ptr)) __xg_new = (new); \ \ switch (sizeof(__xg_orig)) { \ case 4: __xg_orig = (__force __typeof__(*ptr)) \ __cmpxchg_32((__force uint32_t *)__xg_ptr, \ (__force uint32_t)__xg_test, \ (__force uint32_t)__xg_new); break; \ default: \ __xg_orig = (__typeof__(__xg_orig))0; \ asm volatile("break"); \ break; \ } \ \ __xg_orig; \ }) #endif #include <asm-generic/cmpxchg-local.h> static inline unsigned long __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new, int size) { switch (size) { case 4: return cmpxchg((unsigned long *)ptr, old, new); default: return __cmpxchg_local_generic(ptr, old, new, size); } return old; } /* * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make * them available. */ #define cmpxchg_local(ptr, o, n) \ ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \ (unsigned long)(n), sizeof(*(ptr)))) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif /* _ASM_CMPXCHG_H */