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| author | kib <kib@FreeBSD.org> | 2011-01-08 16:13:44 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2011-01-08 16:13:44 +0000 |
| commit | 06eb8de1e11605ee7d4ae2e5c58cdadccc659f0d (patch) | |
| tree | 89f01dcb94af1295c1d16e6a0cf6aa53ea8dcefc /sys/amd64/include/vmparam.h | |
| parent | 12d561f88acf9296f4d7f1ba98ad4d9a8da70bf3 (diff) | |
| download | FreeBSD-src-06eb8de1e11605ee7d4ae2e5c58cdadccc659f0d.zip FreeBSD-src-06eb8de1e11605ee7d4ae2e5c58cdadccc659f0d.tar.gz | |
Create shared (readonly) page. Each ABI may specify the use of page by
setting SV_SHP flag and providing pointer to the vm object and mapping
address. Provide simple allocator to carve space in the page, tailored
to put the code with alignment restrictions.
Enable shared page use for amd64, both native and 32bit FreeBSD
binaries. Page is private mapped at the top of the user address
space, moving a start of the stack one page down. Move signal
trampoline code from the top of the stack to the shared page.
Reviewed by: alc
Diffstat (limited to 'sys/amd64/include/vmparam.h')
| -rw-r--r-- | sys/amd64/include/vmparam.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h index 7a50c59..88d68b9 100644 --- a/sys/amd64/include/vmparam.h +++ b/sys/amd64/include/vmparam.h @@ -186,7 +186,8 @@ #define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0) -#define USRSTACK VM_MAXUSER_ADDRESS +#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) +#define USRSTACK SHAREDPAGE #define VM_MAX_ADDRESS UPT_MAX_ADDRESS #define VM_MIN_ADDRESS (0) |
