1*f80ad8b4SAndroid Build Coastguard Worker /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*f80ad8b4SAndroid Build Coastguard Worker #ifndef __ASM_GENERIC_SEMBUF_H 3*f80ad8b4SAndroid Build Coastguard Worker #define __ASM_GENERIC_SEMBUF_H 4*f80ad8b4SAndroid Build Coastguard Worker 5*f80ad8b4SAndroid Build Coastguard Worker #include <asm/bitsperlong.h> 6*f80ad8b4SAndroid Build Coastguard Worker #include <asm/ipcbuf.h> 7*f80ad8b4SAndroid Build Coastguard Worker 8*f80ad8b4SAndroid Build Coastguard Worker /* 9*f80ad8b4SAndroid Build Coastguard Worker * The semid64_ds structure for most architectures (though it came from x86_32 10*f80ad8b4SAndroid Build Coastguard Worker * originally). Note extra padding because this structure is passed back and 11*f80ad8b4SAndroid Build Coastguard Worker * forth between kernel and user space. 12*f80ad8b4SAndroid Build Coastguard Worker * 13*f80ad8b4SAndroid Build Coastguard Worker * semid64_ds was originally meant to be architecture specific, but 14*f80ad8b4SAndroid Build Coastguard Worker * everyone just ended up making identical copies without specific 15*f80ad8b4SAndroid Build Coastguard Worker * optimizations, so we may just as well all use the same one. 16*f80ad8b4SAndroid Build Coastguard Worker * 17*f80ad8b4SAndroid Build Coastguard Worker * 64 bit architectures use a 64-bit long time field here, while 18*f80ad8b4SAndroid Build Coastguard Worker * 32 bit architectures have a pair of unsigned long values. 19*f80ad8b4SAndroid Build Coastguard Worker * 20*f80ad8b4SAndroid Build Coastguard Worker * On big-endian systems, the padding is in the wrong place for 21*f80ad8b4SAndroid Build Coastguard Worker * historic reasons, so user space has to reconstruct a time_t 22*f80ad8b4SAndroid Build Coastguard Worker * value using 23*f80ad8b4SAndroid Build Coastguard Worker * 24*f80ad8b4SAndroid Build Coastguard Worker * user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime + 25*f80ad8b4SAndroid Build Coastguard Worker * ((long long)kernel_semid64_ds.sem_otime_high << 32) 26*f80ad8b4SAndroid Build Coastguard Worker * 27*f80ad8b4SAndroid Build Coastguard Worker * Pad space is left for 2 miscellaneous 32-bit values 28*f80ad8b4SAndroid Build Coastguard Worker */ 29*f80ad8b4SAndroid Build Coastguard Worker struct semid64_ds { 30*f80ad8b4SAndroid Build Coastguard Worker struct ipc64_perm sem_perm; /* permissions .. see ipc.h */ 31*f80ad8b4SAndroid Build Coastguard Worker #if __BITS_PER_LONG == 64 32*f80ad8b4SAndroid Build Coastguard Worker long sem_otime; /* last semop time */ 33*f80ad8b4SAndroid Build Coastguard Worker long sem_ctime; /* last change time */ 34*f80ad8b4SAndroid Build Coastguard Worker #else 35*f80ad8b4SAndroid Build Coastguard Worker unsigned long sem_otime; /* last semop time */ 36*f80ad8b4SAndroid Build Coastguard Worker unsigned long sem_otime_high; 37*f80ad8b4SAndroid Build Coastguard Worker unsigned long sem_ctime; /* last change time */ 38*f80ad8b4SAndroid Build Coastguard Worker unsigned long sem_ctime_high; 39*f80ad8b4SAndroid Build Coastguard Worker #endif 40*f80ad8b4SAndroid Build Coastguard Worker unsigned long sem_nsems; /* no. of semaphores in array */ 41*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused3; 42*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused4; 43*f80ad8b4SAndroid Build Coastguard Worker }; 44*f80ad8b4SAndroid Build Coastguard Worker 45*f80ad8b4SAndroid Build Coastguard Worker #endif /* __ASM_GENERIC_SEMBUF_H */ 46