89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* (C) 2014 Karim Allah Ahmed <karim.allah.ahmed@gmail.com>
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* (C) 2020, EPAM Systems Inc.
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*/
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#ifndef _ASM_ARM_XEN_SYSTEM_H
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#define _ASM_ARM_XEN_SYSTEM_H
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#include <compiler.h>
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#include <asm/bitops.h>
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/* If *ptr == old, then store new there (and return new).
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* Otherwise, return the old value.
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* Atomic.
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*/
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#define synch_cmpxchg(ptr, old, new) \
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({ __typeof__(*ptr) stored = old; \
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__atomic_compare_exchange_n(ptr, &stored, new, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? new : old; \
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})
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/* As test_and_clear_bit, but using __ATOMIC_SEQ_CST */
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static inline int synch_test_and_clear_bit(int nr, volatile void *addr)
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{
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u8 *byte = ((u8 *)addr) + (nr >> 3);
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u8 bit = 1 << (nr & 7);
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u8 orig;
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orig = __atomic_fetch_and(byte, ~bit, __ATOMIC_SEQ_CST);
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return (orig & bit) != 0;
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}
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/* As test_and_set_bit, but using __ATOMIC_SEQ_CST */
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static inline int synch_test_and_set_bit(int nr, volatile void *base)
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{
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u8 *byte = ((u8 *)base) + (nr >> 3);
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u8 bit = 1 << (nr & 7);
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u8 orig;
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orig = __atomic_fetch_or(byte, bit, __ATOMIC_SEQ_CST);
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return (orig & bit) != 0;
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}
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/* As set_bit, but using __ATOMIC_SEQ_CST */
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static inline void synch_set_bit(int nr, volatile void *addr)
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{
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synch_test_and_set_bit(nr, addr);
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}
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/* As clear_bit, but using __ATOMIC_SEQ_CST */
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static inline void synch_clear_bit(int nr, volatile void *addr)
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{
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synch_test_and_clear_bit(nr, addr);
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}
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/* As test_bit, but with a following memory barrier. */
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//static inline int synch_test_bit(int nr, volatile void *addr)
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static inline int synch_test_bit(int nr, const void *addr)
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{
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int result;
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result = test_bit(nr, addr);
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barrier();
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return result;
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}
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#define xchg(ptr, v) __atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
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#define xchg(ptr, v) __atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
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#define xen_mb() mb()
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#define xen_rmb() rmb()
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#define xen_wmb() wmb()
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#define to_phys(x) ((unsigned long)(x))
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#define to_virt(x) ((void *)(x))
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#define PFN_UP(x) (unsigned long)(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
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#define PFN_DOWN(x) (unsigned long)((x) >> PAGE_SHIFT)
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#define PFN_PHYS(x) ((unsigned long)(x) << PAGE_SHIFT)
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#define PHYS_PFN(x) (unsigned long)((x) >> PAGE_SHIFT)
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#define virt_to_pfn(_virt) (PFN_DOWN(to_phys(_virt)))
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#define virt_to_mfn(_virt) (PFN_DOWN(to_phys(_virt)))
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#define mfn_to_virt(_mfn) (to_virt(PFN_PHYS(_mfn)))
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#define pfn_to_virt(_pfn) (to_virt(PFN_PHYS(_pfn)))
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#endif
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