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feat: Implement a basic MMU configuration

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Alexander Neuhäuser
2026-03-08 17:18:57 +01:00
parent 55f410e2bb
commit 6af820815d
13 changed files with 244 additions and 49 deletions
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33
src/configuration.rs
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@@ -1,16 +1,33 @@
static SCTLR_EL1_MMU_DISABLED: u64 = 0; //M
static SCTLR_EL1_DATA_CACHE_DISABLED: u64 = 0 << 2; //C
static SCTLR_EL1_INSTRUCTION_CACHE_DISABLED: u64 = 0 << 12; //I
static SCTLR_EL1_LITTLE_ENDIAN_EL0: u64 = 0 << 24; //E0E
static SCTLR_EL1_LITTLE_ENDIAN_EL1: u64 = 0 << 25; //EE
const SCTLR_EL1_MMU_ENABLED: u64 = 1; //M
const SCTLR_EL1_DATA_CACHE_DISABLED: u64 = 0 << 2; //C
const SCTLR_EL1_INSTRUCTION_CACHE_DISABLED: u64 = 0 << 12; //I
const SCTLR_EL1_LITTLE_ENDIAN_EL0: u64 = 0 << 24; //E0E
const SCTLR_EL1_LITTLE_ENDIAN_EL1: u64 = 0 << 25; //EE
const SCTLR_EL1_SPAN: u64 = 1 << 23; //SPAN
#[allow(clippy::identity_op)]
static SCTLR_EL1_RES: u64 = (0 << 6) | (1 << 11) | (0 << 17) | (1 << 20) | (1 << 22); //Res0 & Res1
const SCTLR_EL1_RES: u64 = (0 << 6) | (1 << 11) | (0 << 17) | (1 << 20) | (1 << 22); //Res0 & Res1
#[no_mangle]
pub static SCTLR_EL1_CONF: u64 = SCTLR_EL1_MMU_DISABLED
pub static SCTLR_EL1_CONF: u64 = SCTLR_EL1_MMU_ENABLED
| SCTLR_EL1_DATA_CACHE_DISABLED
| SCTLR_EL1_INSTRUCTION_CACHE_DISABLED
| SCTLR_EL1_LITTLE_ENDIAN_EL0
| SCTLR_EL1_LITTLE_ENDIAN_EL1
| SCTLR_EL1_RES;
| SCTLR_EL1_RES
| SCTLR_EL1_SPAN;
const TG0: u64 = 0b00 << 14; // 4KB granularity EL0
const T0SZ: u64 = 25; // 25 Bits of TTBR select -> 39 Bits of VA
const SH0: u64 = 0b11 << 12; // Inner shareable
const TG1: u64 = 0b10 << 30; // 4KB granularity EL1
const T1SZ: u64 = 25 << 16; // 25 Bits of TTBR select -> 39 Bits of VA
const EPD1: u64 = 0b1 << 23; // Trigger translation fault when using TTBR1_EL1
const SH1: u64 = 0b11 << 28; // Inner sharable
const IPS: u64 = 0b000 << 32; // 32 bits of PA space -> up to 4GiB
const AS: u64 = 0b1 << 36; // configure an ASID size of 16 bits
#[no_mangle]
pub static TCR_EL1_CONF: u64 = IPS | TG0 | TG1 | T0SZ | T1SZ | SH0 | SH1 | EPD1 | AS;