diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/bits/shm.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/shm.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/shm.h b/sysdeps/unix/sysv/linux/bits/shm.h index 95f7863913..76144f5ad4 100644 --- a/sysdeps/unix/sysv/linux/bits/shm.h +++ b/sysdeps/unix/sysv/linux/bits/shm.h @@ -58,6 +58,28 @@ typedef __syscall_ulong_t shmatt_t; # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ # define SHM_NORESERVE 010000 /* don't check for reservations */ +/* When SHM_HUGETLB is set, bits [26:31] encode the log2 of the huge page size. + The following definitions are associated with this huge page size encoding. + It is responsibility of the application to know which sizes are supported on + the running system. See shmget(2) man page for details. */ + +#define SHM_HUGE_SHIFT 26 +#define SHM_HUGE_MASK 0x3f + +#define SHM_HUGE_16KB (14 << SHM_HUGE_SHIFT) +#define SHM_HUGE_64KB (16 << SHM_HUGE_SHIFT) +#define SHM_HUGE_512KB (19 << SHM_HUGE_SHIFT) +#define SHM_HUGE_1MB (20 << SHM_HUGE_SHIFT) +#define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT) +#define SHM_HUGE_8MB (23 << SHM_HUGE_SHIFT) +#define SHM_HUGE_16MB (24 << SHM_HUGE_SHIFT) +#define SHM_HUGE_32MB (25 << SHM_HUGE_SHIFT) +#define SHM_HUGE_256MB (28 << SHM_HUGE_SHIFT) +#define SHM_HUGE_512MB (29 << SHM_HUGE_SHIFT) +#define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT) +#define SHM_HUGE_2GB (31 << SHM_HUGE_SHIFT) +#define SHM_HUGE_16GB (34U << SHM_HUGE_SHIFT) + struct shminfo { __syscall_ulong_t shmmax; |