diff options
| author | David S. Miller <davem@davemloft.net> | 2014-09-26 21:58:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-05 16:53:39 -0700 |
| commit | 4397bed080598001e88f612deb8b080bb1cc2322 (patch) | |
| tree | c649278e09119997cb28176bb5b090b8b881fc5c /arch/sparc/include | |
| parent | ac55c768143aa34cc3789c4820cbb0809a76fd9c (diff) | |
sparc64: Define VA hole at run time, rather than at compile time.
Now that we use 4-level page tables, we can provide up to 53-bits of
virtual address space to the user.
Adjust the VA hole based upon the capabilities of the cpu type probed.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
Diffstat (limited to 'arch/sparc/include')
| -rw-r--r-- | arch/sparc/include/asm/page_64.h | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h index 09ceb68e72b7..2211a8036bfa 100644 --- a/arch/sparc/include/asm/page_64.h +++ b/arch/sparc/include/asm/page_64.h @@ -102,21 +102,14 @@ typedef unsigned long pgprot_t; typedef pte_t *pgtable_t; -/* These two values define the virtual address space range in which we - * must forbid 64-bit user processes from making mappings. It used to - * represent precisely the virtual address space hole present in most - * early sparc64 chips including UltraSPARC-I. But now it also is - * further constrained by the limits of our page tables, which is - * 43-bits of virtual address. - */ -#define SPARC64_VA_HOLE_TOP _AC(0xfffffc0000000000,UL) -#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000040000000000,UL) +extern unsigned long sparc64_va_hole_top; +extern unsigned long sparc64_va_hole_bottom; /* The next two defines specify the actual exclusion region we * enforce, wherein we use a 4GB red zone on each side of the VA hole. */ -#define VA_EXCLUDE_START (SPARC64_VA_HOLE_BOTTOM - (1UL << 32UL)) -#define VA_EXCLUDE_END (SPARC64_VA_HOLE_TOP + (1UL << 32UL)) +#define VA_EXCLUDE_START (sparc64_va_hole_bottom - (1UL << 32UL)) +#define VA_EXCLUDE_END (sparc64_va_hole_top + (1UL << 32UL)) #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \ _AC(0x0000000070000000,UL) : \ |