From 4397bed080598001e88f612deb8b080bb1cc2322 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 26 Sep 2014 21:58:33 -0700 Subject: 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 Acked-by: Bob Picco --- arch/sparc/mm/init_64.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'arch/sparc/mm') diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 091f846e6192..c241c5723373 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -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; } -- cgit v1.2.3