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| author | David S. Miller <davem@sunset.davemloft.net> | 2006-03-02 18:12:27 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:14:14 -0800 |
| commit | 8bcd17411643beb9a601e032d0cf1016909a81d3 (patch) | |
| tree | fc71e788df4fada768247fa7c12e983d2f6f1a32 /include/asm-sparc64/page.h | |
| parent | 45f791eb0f03e760183d30d3f1f18dc2b8e902fe (diff) | |
| download | kernel_samsung_smdk4412-8bcd17411643beb9a601e032d0cf1016909a81d3.zip kernel_samsung_smdk4412-8bcd17411643beb9a601e032d0cf1016909a81d3.tar.gz kernel_samsung_smdk4412-8bcd17411643beb9a601e032d0cf1016909a81d3.tar.bz2 | |
[SPARC64]: Do not allow mapping pages within 4GB of 64-bit VA hole.
The UltraSPARC T1 manual recommends this because the chip
could instruction prefetch into the VA hole, and this would
also make decoding certain kinds of memory access traps
more difficult (because the chip sign extends certain pieces
of trap state).
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/page.h')
| -rw-r--r-- | include/asm-sparc64/page.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-sparc64/page.h b/include/asm-sparc64/page.h index 5426bb2..c277ac5 100644 --- a/include/asm-sparc64/page.h +++ b/include/asm-sparc64/page.h @@ -107,7 +107,8 @@ typedef unsigned long pgprot_t; #endif #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \ - (_AC(0x0000000070000000,UL)) : (PAGE_OFFSET)) + (_AC(0x0000000070000000,UL)) : \ + (_AC(0xfffff80000000000,UL) + (1UL << 32UL))) #endif /* !(__ASSEMBLY__) */ |