diff options
| 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 | |
| parent | 45f791eb0f03e760183d30d3f1f18dc2b8e902fe (diff) | |
[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')
| -rw-r--r-- | include/asm-sparc64/a.out.h | 4 | ||||
| -rw-r--r-- | include/asm-sparc64/page.h | 3 |
2 files changed, 5 insertions, 2 deletions
diff --git a/include/asm-sparc64/a.out.h b/include/asm-sparc64/a.out.h index 02af289e3f4..faac321d559 100644 --- a/include/asm-sparc64/a.out.h +++ b/include/asm-sparc64/a.out.h @@ -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 diff --git a/include/asm-sparc64/page.h b/include/asm-sparc64/page.h index 5426bb28a99..c277ac56b9d 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__) */ |