forked from Minki/linux
9f54ad6652
asm/xen/hypercall.h, asm/xen/hypervisor.h, asm/xen/interface.h and asm/xen/page.h are identical so to avoid code duplication we are just including the original arm header files here. asm/xen/events.h is slightly different, so introduce a different file here (use xchg to implement xchg_xen_ulong and pass regs->pstate to raw_irqs_disabled_flags). Also introduce asm/hypervisor.h and asm/sync_bitops.h. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>
27 lines
1.1 KiB
C
27 lines
1.1 KiB
C
#ifndef __ASM_SYNC_BITOPS_H__
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#define __ASM_SYNC_BITOPS_H__
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#include <asm/bitops.h>
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#include <asm/cmpxchg.h>
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/* sync_bitops functions are equivalent to the SMP implementation of the
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* original functions, independently from CONFIG_SMP being defined.
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*
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* We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
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* under Xen you might be communicating with a completely external entity
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* who might be on another CPU (e.g. two uniprocessor guests communicating
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* via event channels and grant tables). So we need a variant of the bit
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* ops which are SMP safe even on a UP kernel.
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*/
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#define sync_set_bit(nr, p) set_bit(nr, p)
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#define sync_clear_bit(nr, p) clear_bit(nr, p)
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#define sync_change_bit(nr, p) change_bit(nr, p)
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#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p)
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#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p)
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#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p)
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#define sync_test_bit(nr, addr) test_bit(nr, addr)
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#define sync_cmpxchg cmpxchg
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#endif
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