diff options
| author | Radha Mohan Chintakuntla <rchintakuntla@cavium.com> | 2014-03-07 08:49:25 (GMT) |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-03-13 11:22:36 (GMT) |
| commit | 87366d8cf7b3f6dc34633938aa8766e5a390ce33 (patch) | |
| tree | 9af5603c6cf5627207b0b78a44777bdfde6a1f87 /arch/arm64/mm/proc.S | |
| parent | 71fdb6bf61bf0692f004f9daf5650392c0cfe300 (diff) | |
| download | linux-87366d8cf7b3f6dc34633938aa8766e5a390ce33.tar.xz | |
arm64: Add boot time configuration of Intermediate Physical Address size
ARMv8 supports a range of physical address bit sizes. The PARange bits
from ID_AA64MMFR0_EL1 register are read during boot-time and the
intermediate physical address size bits are written in the translation
control registers (TCR_EL1 and VTCR_EL2).
There is no change in the VA bits and levels of translation.
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Reviewed-by: Will Deacon <Will.deacon@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm/proc.S')
| -rw-r--r-- | arch/arm64/mm/proc.S | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index e0ef63c..e085ee6 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -209,8 +209,14 @@ ENTRY(__cpu_setup) * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for * both user and kernel. */ - ldr x10, =TCR_TxSZ(VA_BITS) | TCR_FLAGS | TCR_IPS_40BIT | \ + ldr x10, =TCR_TxSZ(VA_BITS) | TCR_FLAGS | \ TCR_ASID16 | TCR_TBI0 | (1 << 31) + /* + * Read the PARange bits from ID_AA64MMFR0_EL1 and set the IPS bits in + * TCR_EL1. + */ + mrs x9, ID_AA64MMFR0_EL1 + bfi x10, x9, #32, #3 #ifdef CONFIG_ARM64_64K_PAGES orr x10, x10, TCR_TG0_64K orr x10, x10, TCR_TG1_64K |