kernel-fxtec-pro1x/arch
Paul Mackerras 721151d004 [POWERPC] Allow drivers to map individual 4k pages to userspace
Some drivers have resources that they want to be able to map into
userspace that are 4k in size.  On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything.  This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.

This patch adds a new function, remap_4k_pfn, which drivers can use to
map a single 4k page to userspace regardless of whether the kernel is
using a 4k or a 64k page size.  Like remap_pfn_range, it would
typically be called in a driver's mmap function.  It only maps a
single 4k page, which on a 64k page kernel appears replicated 16 times
throughout a 64k page.  On a 4k page kernel it reduces to a call to
remap_pfn_range.

The way this works on a 64k kernel is that a new bit, _PAGE_4K_PFN,
gets set on the linux PTE.  This alters the way that __hash_page_4K
computes the real address to put in the HPTE.  The RPN field of the
linux PTE becomes the 4k RPN directly rather than being interpreted as
a 64k RPN.  Since the RPN field is 32 bits, this means that physical
addresses being mapped with remap_4k_pfn have to be below 2^44,
i.e. 0x100000000000.

The patch also factors out the code in arch/powerpc/mm/hash_utils_64.c
that deals with demoting a process to use 4k pages into one function
that gets called in the various different places where we need to do
that.  There were some discrepancies between exactly what was done in
the various places, such as a call to spu_flush_all_slbs in one case
but not in others.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-13 03:55:18 +10:00
..
alpha [PATCH] Dynamic kernel command-line: alpha 2007-02-12 09:48:37 -08:00
arm [ARM] Export dma_channel_active() 2007-03-31 21:36:53 +01:00
arm26 [PATCH] arch/arm26/kernel/entry.S: remove dead code 2007-03-01 14:53:35 -08:00
avr32 [PATCH] gpio_direction_output() needs an initial value 2007-03-16 19:25:04 -07:00
cris [PATCH] MSI-X: fix resume crash 2007-03-28 13:59:37 -07:00
frv [PATCH] MSI-X: fix resume crash 2007-03-28 13:59:37 -07:00
h8300 [PATCH] Declare init_irq_proc before we use it. 2007-02-19 14:21:50 -08:00
i386 [PATCH] i386: irqbalance_disable() section fix 2007-04-08 19:47:55 -07:00
ia64 [IA64] SGI Altix : fix pcibr_dmamap_ate32() bug 2007-04-06 15:38:12 -07:00
m32r Various typo fixes. 2007-02-17 19:07:33 +01:00
m68k [PATCH] Declare init_irq_proc before we use it. 2007-02-19 14:21:50 -08:00
m68knommu [PATCH] m68knommu: remove local_bh_count 2007-03-06 18:08:38 -08:00
mips [MIPS] SMTC: Fix recursion in instant IPI replay code. 2007-03-29 23:46:36 +01:00
parisc [PARISC] clocksource: Move update_cr16_clocksource later in boot 2007-02-26 22:21:22 -05:00
powerpc [POWERPC] Allow drivers to map individual 4k pages to userspace 2007-04-13 03:55:18 +10:00
ppc [POWERPC] Remove unused header file: arch/ppc/syslib/cpc710.h. 2007-04-13 03:55:16 +10:00
s390 [S390] kprobes: Align probe address. 2007-03-26 20:43:46 +02:00
sh sh: Kill bogus GCC4 symbol exports. 2007-03-28 17:24:47 +09:00
sh64 [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
sparc [SPARC32]: Fix SMP build regression 2007-03-26 21:49:13 -07:00
sparc64 [SPARC64]: store-init needs trailing membar. 2007-03-19 13:27:33 -07:00
um [PATCH] uml: fix unreasonably long udelay 2007-04-02 10:06:08 -07:00
v850 kbuild: Replace remaining "depends" with "depends on" 2007-02-17 19:05:24 +01:00
x86_64 [PATCH] x86_64 early quirks: fix early_qrk[] section tag 2007-04-08 19:47:55 -07:00
xtensa [PATCH] Dynamic kernel command-line: xtensa 2007-02-12 09:48:39 -08:00