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| author | Mark Nutter <mnutter@us.ibm.com> | 2006-03-23 02:00:12 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-03-27 07:48:28 +0400 |
| commit | 6df10a82f8de89c66eb91c371d62d76e87b2cbba (patch) | |
| tree | e8615f4c00a44f4e4a609d59c51e958f0300526b /arch/powerpc/platforms/cell/Kconfig | |
| parent | a33a7d7309d79656bc19a0e96fc4547a1633283e (diff) | |
| download | linux-6df10a82f8de89c66eb91c371d62d76e87b2cbba.tar.xz | |
[PATCH] spufs: enable SPE problem state MMIO access.
This patch is layered on top of CONFIG_SPARSEMEM
and is patterned after direct mapping of LS.
This patch allows mmap() of the following regions:
"mfc", which represents the area from [0x3000 - 0x3fff];
"cntl", which represents the area from [0x4000 - 0x4fff];
"signal1" which begins at offset 0x14000; "signal2" which
begins at offset 0x1c000.
The signal1 & signal2 files may be mmap()'d by regular user
processes. The cntl and mfc file, on the other hand, may
only be accessed if the owning process has CAP_SYS_RAWIO,
because they have the potential to confuse the kernel
with regard to parallel access to the same files with
regular file operations: the kernel always holds a spinlock
when accessing registers in these areas to serialize them,
which can not be guaranteed with user mmaps,
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/cell/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/Kconfig b/arch/powerpc/platforms/cell/Kconfig index 3157071e241c..c2a3db8edb0c 100644 --- a/arch/powerpc/platforms/cell/Kconfig +++ b/arch/powerpc/platforms/cell/Kconfig @@ -10,4 +10,9 @@ config SPU_FS Units on machines implementing the Broadband Processor Architecture. +config SPUFS_MMAP + bool + depends on SPU_FS && SPARSEMEM && !PPC_64K_PAGES + default y + endmenu |