Commit fdaccf74 authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

sparc64: Increase max_phys_bits to 51 and VA bits to 53 for M8.



On M8 chips, use a max_phys_bits value of 51.

Also, M8 supports VA bits up to 54 bits. However, for now
restrict VA bits to 53 due to 4-level pagetable limitation.

Signed-off-by: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: default avatarBob Picco <bob.picco@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7d484acb
......@@ -1944,12 +1944,22 @@ static void __init setup_page_offset(void)
break;
case SUN4V_CHIP_SPARC_M7:
case SUN4V_CHIP_SPARC_SN:
default:
/* M7 and later support 52-bit virtual addresses. */
sparc64_va_hole_top = 0xfff8000000000000UL;
sparc64_va_hole_bottom = 0x0008000000000000UL;
max_phys_bits = 49;
break;
case SUN4V_CHIP_SPARC_M8:
default:
/* M8 and later support 54-bit virtual addresses.
* However, restricting M8 and above VA bits to 53
* as 4-level page table cannot support more than
* 53 VA bits.
*/
sparc64_va_hole_top = 0xfff0000000000000UL;
sparc64_va_hole_bottom = 0x0010000000000000UL;
max_phys_bits = 51;
break;
}
}
......
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