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// SPDX-License-Identifier: Apache-2.0 OR MIT
//
// Copyright (c) 2018-2019 by the author(s)
//
// Author(s):
// - Andre Richter <andre.o.richter@gmail.com>
//! Translation Control Register - EL1
//!
//! The control register for stage 1 of the EL1&0 translation regime.
use register::{cpu::RegisterReadWrite, register_bitfields};
register_bitfields! {u64,
TCR_EL1 [
/// Top Byte ignored - indicates whether the top byte of an address is used for address
/// match for the TTBR1_EL1 region, or ignored and used for tagged addresses. Defined values
/// are:
///
/// 0 Top Byte used in the address calculation.
/// 1 Top Byte ignored in the address calculation.
TBI1 OFFSET(38) NUMBITS(1) [
Used = 0,
Ignored = 1
],
/// Top Byte ignored - indicates whether the top byte of an address is used for address
/// match for the TTBR0_EL1 region, or ignored and used for tagged addresses. Defined values
/// are:
///
/// 0 Top Byte used in the address calculation.
/// 1 Top Byte ignored in the address calculation.
TBI0 OFFSET(37) NUMBITS(1) [
Used = 0,
Ignored = 1
],
/// Intermediate Physical Address Size.
///
/// 000 32 bits, 4GiB.
/// 001 36 bits, 64GiB.
/// 010 40 bits, 1TiB.
/// 011 42 bits, 4TiB.
/// 100 44 bits, 16TiB.
/// 101 48 bits, 256TiB.
/// 110 52 bits, 4PiB
///
/// Other values are reserved.
///
/// The reserved values behave in the same way as the 101 or 110 encoding, but software must
/// not rely on this property as the behavior of the reserved values might change in a
/// future revision of the architecture.
///
/// The value 110 is permitted only if ARMv8.2-LPA is implemented and the translation
/// granule size is 64KiB.
///
/// In an implementation that supports 52-bit PAs, if the value of this field is not 110 ,
/// then bits[51:48] of every translation table base address for the stage of translation
/// controlled by TCR_EL1 are 0000
/// .
IPS OFFSET(32) NUMBITS(3) [
Bits_32 = 0b000,
Bits_36 = 0b001,
Bits_40 = 0b010,
Bits_42 = 0b011,
Bits_44 = 0b100,
Bits_48 = 0b101,
Bits_52 = 0b110
],
/// Granule size for the TTBR1_EL1.
///
/// 00 4KiB
/// 01 64KiB
/// 10 16KiB
///
/// Other values are reserved.
///
/// If the value is programmed to either a reserved value, or a size that has not been
/// implemented, then the hardware will treat the field as if it has been programmed to an
/// IMPLEMENTATION DEFINED choice of the sizes that has been implemented for all purposes
/// other than the value read back from this register.
///
/// It is IMPLEMENTATION DEFINED whether the value read back is the value programmed or the
/// value that corresponds to the size chosen.
TG1 OFFSET(30) NUMBITS(2) [
KiB_4 = 0b00,
KiB_16 = 0b10,
KiB_64 = 0b01
],
/// Shareability attribute for memory associated with translation table walks using
/// TTBR1_EL1.
///
/// 00 Non-shareable
/// 10 Outer Shareable
/// 11 Inner Shareable
///
/// Other values are reserved.
SH1 OFFSET(28) NUMBITS(2) [
None = 0b00,
Outer = 0b10,
Inner = 0b11
],
/// Outer cacheability attribute for memory associated with translation table walks using
/// TTBR1_EL1.
///
/// 00 Normal memory, Outer Non-cacheable
///
/// 01 Normal memory, Outer Write-Back Read-Allocate Write-Allocate Cacheable
///
/// 10 Normal memory, Outer Write-Through Read-Allocate No Write-Allocate Cacheable
///
/// 11 Normal memory, Outer Write-Back Read-Allocate No Write-Allocate Cacheable
ORGN1 OFFSET(26) NUMBITS(2) [
NonCacheable = 0b00,
WriteBack_ReadAlloc_WriteAlloc_Cacheable = 0b01,
WriteThrough_ReadAlloc_NoWriteAlloc_Cacheable = 0b10,
WriteBack_ReadAlloc_NoWriteAlloc_Cacheable = 0b11
],
/// Inner cacheability attribute for memory associated with translation
/// table walks using TTBR1_EL1.
///
/// 00 Normal memory, Inner Non-cacheable
///
/// 01 Normal memory, Inner Write-Back Read-Allocate Write-Allocate Cacheable
///
/// 10 Normal memory, Inner Write-Through Read-Allocate No Write-Allocate Cacheable
///
/// 11 Normal memory, Inner Write-Back Read-Allocate No Write-Allocate Cacheable
IRGN1 OFFSET(24) NUMBITS(2) [
NonCacheable = 0b00,
WriteBack_ReadAlloc_WriteAlloc_Cacheable = 0b01,
WriteThrough_ReadAlloc_NoWriteAlloc_Cacheable = 0b10,
WriteBack_ReadAlloc_NoWriteAlloc_Cacheable = 0b11
],
/// Translation table walk disable for translations using TTBR1_EL1. This bit controls
/// whether a translation table walk is performed on a TLB miss, for an address that is
/// translated using TTBR1_EL1. The encoding of this bit is:
///
/// 0 Perform translation table walks using TTBR1_EL1.
///
/// 1 A TLB miss on an address that is translated using TTBR1_EL1 generates a Translation
/// fault. No translation table walk is performed.
EPD1 OFFSET(23) NUMBITS(1) [
EnableTTBR1Walks = 0,
DisableTTBR1Walks = 1
],
/// The size offset of the memory region addressed by TTBR0_EL1. The region size is
/// 2^(64-T0SZ) bytes.
///
/// The maximum and minimum possible values for T0SZ depend on the level of translation
/// table and the memory translation granule size, as described in the AArch64 Virtual
/// Memory System Architecture chapter.
T1SZ OFFSET(16) NUMBITS(6) [],
/// Granule size for the TTBR0_EL1.
///
/// 00 4KiB
/// 01 64KiB
/// 10 16KiB
///
/// Other values are reserved.
///
/// If the value is programmed to either a reserved value, or a size that has not been
/// implemented, then the hardware will treat the field as if it has been programmed to an
/// IMPLEMENTATION DEFINED choice of the sizes that has been implemented for all purposes
/// other than the value read back from this register.
///
/// It is IMPLEMENTATION DEFINED whether the value read back is the value programmed or the
/// value that corresponds to the size chosen.
TG0 OFFSET(14) NUMBITS(2) [
KiB_4 = 0b00,
KiB_16 = 0b10,
KiB_64 = 0b01
],
/// Shareability attribute for memory associated with translation table walks using
/// TTBR0_EL1.
///
/// 00 Non-shareable
/// 10 Outer Shareable
/// 11 Inner Shareable
///
/// Other values are reserved.
SH0 OFFSET(12) NUMBITS(2) [
None = 0b00,
Outer = 0b10,
Inner = 0b11
],
/// Outer cacheability attribute for memory associated with translation table walks using
/// TTBR0_EL1.
///
/// 00 Normal memory, Outer Non-cacheable
///
/// 01 Normal memory, Outer Write-Back Read-Allocate Write-Allocate Cacheable
///
/// 10 Normal memory, Outer Write-Through Read-Allocate No Write-Allocate Cacheable
///
/// 11 Normal memory, Outer Write-Back Read-Allocate No Write-Allocate Cacheable
ORGN0 OFFSET(10) NUMBITS(2) [
NonCacheable = 0b00,
WriteBack_ReadAlloc_WriteAlloc_Cacheable = 0b01,
WriteThrough_ReadAlloc_NoWriteAlloc_Cacheable = 0b10,
WriteBack_ReadAlloc_NoWriteAlloc_Cacheable = 0b11
],
/// Inner cacheability attribute for memory associated with translation table walks using
/// TTBR0_EL1.
///
/// 00 Normal memory, Inner Non-cacheable
///
/// 01 Normal memory, Inner Write-Back Read-Allocate Write-Allocate Cacheable
///
/// 10 Normal memory, Inner Write-Through Read-Allocate No Write-Allocate Cacheable
///
/// 11 Normal memory, Inner Write-Back Read-Allocate No Write-Allocate Cacheable
IRGN0 OFFSET(8) NUMBITS(2) [
NonCacheable = 0b00,
WriteBack_ReadAlloc_WriteAlloc_Cacheable = 0b01,
WriteThrough_ReadAlloc_NoWriteAlloc_Cacheable = 0b10,
WriteBack_ReadAlloc_NoWriteAlloc_Cacheable = 0b11
],
/// Translation table walk disable for translations using TTBR0_EL1. This bit controls
/// whether a translation table walk is performed on a TLB miss, for an address that is
/// translated using TTBR0_EL1. The encoding of this bit is:
///
/// 0 Perform translation table walks using TTBR0_EL1.
///
/// 1 A TLB miss on an address that is translated using TTBR0_EL1 generates a Translation
/// fault. No translation table walk is performed.
EPD0 OFFSET(7) NUMBITS(1) [
EnableTTBR0Walks = 0,
DisableTTBR0Walks = 1
],
/// The size offset of the memory region addressed by TTBR0_EL1. The region size is
/// 2^(64-T0SZ) bytes.
///
/// The maximum and minimum possible values for T0SZ depend on the level of translation
/// table and the memory translation granule size, as described in the AArch64 Virtual
/// Memory System Architecture chapter.
T0SZ OFFSET(0) NUMBITS(6) []
]
}
pub struct Reg;
impl RegisterReadWrite<u64, TCR_EL1::Register> for Reg {
sys_coproc_read_raw!(u64, "TCR_EL1");
sys_coproc_write_raw!(u64, "TCR_EL1");
}
pub static TCR_EL1: Reg = Reg {};