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[SPARC64]: Do not allow mapping pages within 4GB of 64-bit VA hole.

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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>
This commit is contained in:
David S. Miller
2006-03-02 18:12:27 -08:00
parent 45f791eb0f
commit 8bcd174116
3 changed files with 73 additions and 24 deletions
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4
include/asm-sparc64/a.out.h
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@@ -95,7 +95,9 @@ struct relocation_info /* used when header.a_machtype == M_SPARC */
#ifdef __KERNEL__
#define STACK_TOP (test_thread_flag(TIF_32BIT) ? 0xf0000000 : 0x80000000000L)
#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
0xf0000000 : \
(0x0000080000000000UL - (1UL << 32UL)))
#endif

3
include/asm-sparc64/page.h
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@@ -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__) */