1 Parameter Info Block (PIB), all offsets in pointer-length words
3 buffer_size 0 Size of the destination buffer
5 The total number of bytes in all of the segments that require a
6 buffer to be created in the destination address space. This is
7 specified so that the kernel can allocate one large buffer for all
8 segments before traversing the segment list. When returning from a
9 method, the buffer size only includes buffers allocated by the
10 caller; "inout" segments where the caller specified a non-NULL ptr,
11 and the callee did not increase the length, are not included
12 (because the kernel does not need to allocate a caller-side buffer
13 for them). The kernel may throw an exception if the actual
14 size is greater than specified in this field.
16 objlist_ptr 1 Pointer to the object list
17 objlist_len 2 Length of the object list, in IDs
19 The object list is a special segment that contains object IDs
20 rather than arbitrary data. Each object ID will be translated
21 into the destination ID-space, allocating new IDs when
22 necessary. The IDs themselves are 32 bits each, unsigned,
23 regardless of the pointer size.
25 num_segments 3 Number of data segments
26 segment.ptr 4+n*4 Pointer to data segment
27 segment.len 5+n*4 Length of data segment in bytes
28 segment.flags 6+n*4 Attributes of data segment
29 reserved 7+n*4 Reserved for future use, and for
32 Each segment describes data being transmitted to and/or from the
33 callee. For out segments, the caller may designate a buffer to hold
34 the data, or it may leave the ptr field NULL. The caller may
35 replace an out segment pointer with its own (it must do this if it
36 was NULL), and it may change the length of the segment. Except when
37 flags such as Push or Shared force the kernel to map, rather than
38 copy, the data, it will choose which method to use based on the
39 size, page-alignment, and overmap status of the segment.
41 Segment Flags (see doc/orb/memory-management for more details):
42 In 0x01 Data is copied/mapped from caller to callee.
43 Out 0x02 Data is copied/mapped from callee to caller.
44 Shared 0x04 A permanent shared mapping is created.
45 Push 0x08 The region is unmapped from the source and
46 transferred to the destination.
47 Inline 0x10 The callee cannot change the length of an
48 Out segment. Ignored for In segments.
49 Immutable 0x20 The segment is to be mapped read-only in
50 the destination. Ignored unless Shared is
52 Copy 0x8000 The segment is permanently copied into the
53 destination address space, with read/write