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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>
This commit is contained in:
David S. Miller 2014-09-26 21:58:33 -07:00
parent ac55c76814
commit 4397bed080
2 changed files with 25 additions and 11 deletions
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15
arch/sparc/include/asm/page_64.h
View File

@ -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) : \

21
arch/sparc/mm/init_64.c
View File

@ -1630,25 +1630,46 @@ static void __init page_offset_shift_patch(unsigned long phys_bits)
}
}
unsigned long sparc64_va_hole_top = 0xfffff80000000000UL;
unsigned long sparc64_va_hole_bottom = 0x0000080000000000UL;
static void __init setup_page_offset(void)
{
unsigned long max_phys_bits = 40;
if (tlb_type == cheetah || tlb_type == cheetah_plus) {
/* Cheetah/Panther support a full 64-bit virtual
* address, so we can use all that our page tables
* support.
*/
sparc64_va_hole_top = 0xfff0000000000000UL;
sparc64_va_hole_bottom = 0x0010000000000000UL;
max_phys_bits = 42;
} else if (tlb_type == hypervisor) {
switch (sun4v_chip_type) {
case SUN4V_CHIP_NIAGARA1:
case SUN4V_CHIP_NIAGARA2:
/* T1 and T2 support 48-bit virtual addresses. */
sparc64_va_hole_top = 0xffff800000000000UL;
sparc64_va_hole_bottom = 0x0000800000000000UL;
max_phys_bits = 39;
break;
case SUN4V_CHIP_NIAGARA3:
/* T3 supports 48-bit virtual addresses. */
sparc64_va_hole_top = 0xffff800000000000UL;
sparc64_va_hole_bottom = 0x0000800000000000UL;
max_phys_bits = 43;
break;
case SUN4V_CHIP_NIAGARA4:
case SUN4V_CHIP_NIAGARA5:
case SUN4V_CHIP_SPARC64X:
default:
/* T4 and later support 52-bit virtual addresses. */
sparc64_va_hole_top = 0xfff8000000000000UL;
sparc64_va_hole_bottom = 0x0008000000000000UL;
max_phys_bits = 47;
break;
}