diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/mach/message.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/mach/message.h b/include/mach/message.h index c3081e66..16788fef 100644 --- a/include/mach/message.h +++ b/include/mach/message.h @@ -316,6 +316,19 @@ typedef integer_t mach_msg_option_t; #define MACH_SEND_ALWAYS 0x00010000 /* internal use only */ +/* This is the alignment of msg descriptors and the actual data. + * + * On x86 it is made equal to the default structure alignment on + * 32-bit, so we can easily maintain compatibility with 32-bit user + * space on a 64-bit kernel. Other architectures might have different + * needs, so this value might change in the future for differents + * architectures. + */ +#define MACH_MSG_ALIGNMENT 4 + +#define msg_is_misaligned(x) ( ((vm_offset_t)(x)) & (MACH_MSG_ALIGNMENT-1) ) +#define msg_align(x) \ + ( ( ((vm_offset_t)(x)) + (MACH_MSG_ALIGNMENT-1) ) & ~(MACH_MSG_ALIGNMENT-1) ) /* * Much code assumes that mach_msg_return_t == kern_return_t. @@ -401,7 +414,6 @@ typedef kern_return_t mach_msg_return_t; #define MACH_RCV_BODY_ERROR 0x1000400c /* Error receiving message body. See special bits. */ - extern mach_msg_return_t mach_msg_trap (mach_msg_user_header_t *msg, |