From 9f54ad6652d454b6a8e932b5307e60c9023bd974 Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Tue, 4 Jun 2013 11:07:03 +0000 Subject: arm64/xen: introduce asm/xen header files on arm64 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 Acked-by: Ian Campbell --- arch/arm64/include/asm/sync_bitops.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 arch/arm64/include/asm/sync_bitops.h (limited to 'arch/arm64/include/asm/sync_bitops.h') diff --git a/arch/arm64/include/asm/sync_bitops.h b/arch/arm64/include/asm/sync_bitops.h new file mode 100644 index 000000000000..8da0bf4f7659 --- /dev/null +++ b/arch/arm64/include/asm/sync_bitops.h @@ -0,0 +1,26 @@ +#ifndef __ASM_SYNC_BITOPS_H__ +#define __ASM_SYNC_BITOPS_H__ + +#include +#include + +/* sync_bitops functions are equivalent to the SMP implementation of the + * original functions, independently from CONFIG_SMP being defined. + * + * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But + * under Xen you might be communicating with a completely external entity + * who might be on another CPU (e.g. two uniprocessor guests communicating + * via event channels and grant tables). So we need a variant of the bit + * ops which are SMP safe even on a UP kernel. + */ + +#define sync_set_bit(nr, p) set_bit(nr, p) +#define sync_clear_bit(nr, p) clear_bit(nr, p) +#define sync_change_bit(nr, p) change_bit(nr, p) +#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) +#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) +#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) +#define sync_test_bit(nr, addr) test_bit(nr, addr) +#define sync_cmpxchg cmpxchg + +#endif -- cgit v1.2.3-59-g8ed1b