Author: andrew Date: Thu Jan 9 10:26:36 2020 New Revision: 356550 URL: https://svnweb.freebsd.org/changeset/base/356550
Log: Add atomic_testandset/clear on arm64. These will reportedly be used in future uma changes. MFC after: 2 weeks Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D23019 Modified: head/sys/arm64/include/atomic.h Modified: head/sys/arm64/include/atomic.h ============================================================================== --- head/sys/arm64/include/atomic.h Thu Jan 9 10:05:45 2020 (r356549) +++ head/sys/arm64/include/atomic.h Thu Jan 9 10:26:36 2020 (r356550) @@ -548,7 +548,87 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val : "memory"); } +static __inline int +atomic_testandclear_32(volatile uint32_t *p, u_int val) +{ + uint32_t mask, old, tmp; + int res; + mask = 1u << (val & 0x1f); + __asm __volatile( + "1: ldxr %w2, [%3] \n" + " bic %w0, %w2, %w4 \n" + " stxr %w1, %w0, [%3] \n" + " cbnz %w1, 1b \n" + : "=&r"(tmp), "=&r"(res), "=&r"(old) + : "r" (p), "r" (mask) + : "memory" + ); + + return ((old & mask) != 0); +} + +static __inline int +atomic_testandclear_64(volatile uint64_t *p, u_int val) +{ + uint64_t mask, old, tmp; + int res; + + mask = 1ul << (val & 0x1f); + __asm __volatile( + "1: ldxr %2, [%3] \n" + " bic %0, %2, %4 \n" + " stxr %w1, %0, [%3] \n" + " cbnz %w1, 1b \n" + : "=&r"(tmp), "=&r"(res), "=&r"(old) + : "r" (p), "r" (mask) + : "memory" + ); + + return ((old & mask) != 0); +} + +static __inline int +atomic_testandset_32(volatile uint32_t *p, u_int val) +{ + uint32_t mask, old, tmp; + int res; + + mask = 1u << (val & 0x1f); + __asm __volatile( + "1: ldxr %w2, [%3] \n" + " orr %w0, %w2, %w4 \n" + " stxr %w1, %w0, [%3] \n" + " cbnz %w1, 1b \n" + : "=&r"(tmp), "=&r"(res), "=&r"(old) + : "r" (p), "r" (mask) + : "memory" + ); + + return ((old & mask) != 0); +} + +static __inline int +atomic_testandset_64(volatile uint64_t *p, u_int val) +{ + uint64_t mask, old, tmp; + int res; + + mask = 1ul << (val & 0x1f); + __asm __volatile( + "1: ldxr %2, [%3] \n" + " orr %0, %2, %4 \n" + " stxr %w1, %0, [%3] \n" + " cbnz %w1, 1b \n" + : "=&r"(tmp), "=&r"(res), "=&r"(old) + : "r" (p), "r" (mask) + : "memory" + ); + + return ((old & mask) != 0); +} + + #define atomic_add_int atomic_add_32 #define atomic_fcmpset_int atomic_fcmpset_32 #define atomic_clear_int atomic_clear_32 @@ -558,6 +638,8 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val #define atomic_set_int atomic_set_32 #define atomic_swap_int atomic_swap_32 #define atomic_subtract_int atomic_subtract_32 +#define atomic_testandclear_int atomic_testandclear_32 +#define atomic_testandset_int atomic_testandset_32 #define atomic_add_acq_int atomic_add_acq_32 #define atomic_fcmpset_acq_int atomic_fcmpset_acq_32 @@ -584,6 +666,8 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val #define atomic_set_long atomic_set_64 #define atomic_swap_long atomic_swap_64 #define atomic_subtract_long atomic_subtract_64 +#define atomic_testandclear_long atomic_testandclear_64 +#define atomic_testandset_long atomic_testandset_64 #define atomic_add_ptr atomic_add_64 #define atomic_fcmpset_ptr atomic_fcmpset_64 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
