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Add some documentation

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Justine Tunney 2024-07-19 02:53:07 -07:00
parent 567d8fe32d
commit 1ff037df3c
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5 changed files with 177 additions and 22 deletions
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1
libc/sysv/consts.sh
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@ -223,7 +223,6 @@ syscon mmap MAP_TYPE 15 15 15 15 15 15 15 15 # mask for type
syscon mmap MAP_FIXED 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 # unix consensus; openbsd appears to forbid; faked nt
syscon mmap MAP_FIXED_NOREPLACE 0x08000000 0x08000000 0x00004000 0x00004000 0x08000000 0x08000000 0x08000000 0x08000000 # handled and defined by cosmo runtime; 0x100000 on linux 4.7+; MAP_FIXED|MAP_EXCL on FreeBSD
syscon mmap MAP_ANONYMOUS 0x00000020 0x00000020 0x00001000 0x00001000 0x00001000 0x00001000 0x00001000 0x00000020 # bsd consensus; faked nt
syscon mmap MAP_GROWSDOWN 0x00000100 0x00000100 0 0 0 0 0 0 # use MAP_STACK; abstracted by MAP_STACK; may be passed to __sys_mmap() for low-level Linux fiddling
syscon mmap MAP_LOCKED 0x00002000 0x00002000 0 0 0 0 0 0
syscon mmap MAP_NORESERVE 0x00004000 0x00004000 0x00000040 0x00000040 0 0 0x00000040 0 # Linux calls it "reserve"; NT calls it "commit"? which is default?
syscon mmap MAP_POPULATE 0x00008000 0x00008000 0 0 0x00040000 0 0 0 # MAP_PREFAULT_READ on FreeBSD; can avoid madvise(MADV_WILLNEED) on private file mapping

2
libc/sysv/consts/MAP_GROWSDOWN.S
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@ -1,2 +0,0 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon mmap,MAP_GROWSDOWN,0x00000100,0x00000100,0,0,0,0,0,0