forked from M-Labs/zynq-rs
begin MMU implementation
This commit is contained in:
parent
69b65b5f72
commit
9bebfb49bc
|
|
@ -0,0 +1,378 @@
|
|||
use core::mem::uninitialized;
|
||||
use bit_field::BitField;
|
||||
use super::{regs::*, asm};
|
||||
use crate::regs::RegisterW;
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(u8)]
|
||||
pub enum AccessDomain {
|
||||
NoAccess = 0b00,
|
||||
Client = 0b01,
|
||||
_Reserved = 0b10,
|
||||
Manager = 0b11,
|
||||
}
|
||||
|
||||
const ACCESS_DOMAINS_SIZE: usize = 16;
|
||||
pub struct AccessDomains([AccessDomain; ACCESS_DOMAINS_SIZE]);
|
||||
|
||||
impl AccessDomains {
|
||||
pub fn all_manager() -> Self {
|
||||
AccessDomains([AccessDomain::Manager; ACCESS_DOMAINS_SIZE])
|
||||
}
|
||||
}
|
||||
|
||||
impl Into<u32> for AccessDomains {
|
||||
fn into(self) -> u32 {
|
||||
let mut result = 0;
|
||||
for (i, domain) in self.0.iter().enumerate() {
|
||||
result |= (*domain as u32) << (2 * i);
|
||||
}
|
||||
result
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(u8)]
|
||||
pub enum AccessPermissions {
|
||||
PermissionFault = 0,
|
||||
PrivilegedOnly,
|
||||
NoUserWrite,
|
||||
FullAccess,
|
||||
_Reserved1,
|
||||
PrivilegedReadOnly,
|
||||
ReadOnly,
|
||||
_Reserved2
|
||||
}
|
||||
|
||||
impl AccessPermissions {
|
||||
fn ap(&self) -> u8 {
|
||||
(*self as u8) & 0b11
|
||||
}
|
||||
|
||||
fn apx(&self) -> bool {
|
||||
(*self as u8) > (AccessPermissions::FullAccess as u8)
|
||||
}
|
||||
}
|
||||
|
||||
pub struct L1Section {
|
||||
pub global: bool,
|
||||
pub shareable: bool,
|
||||
pub access: AccessPermissions,
|
||||
/// Type EXtension
|
||||
pub tex: u8,
|
||||
pub domain: u8,
|
||||
pub exec: bool,
|
||||
pub cacheable: bool,
|
||||
pub bufferable: bool,
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
pub struct L1Entry(u32);
|
||||
|
||||
impl L1Entry {
|
||||
#[inline(always)]
|
||||
pub fn section(phys_base: u32, section: L1Section) -> Self {
|
||||
/// Must be aligned to 1 MB
|
||||
assert!(phys_base & 0x000f_ffff == 0);
|
||||
let mut entry = L1Entry(phys_base);
|
||||
|
||||
entry.0.set_bits(0..=1, 0b10);
|
||||
entry.0.set_bit(2, section.bufferable);
|
||||
entry.0.set_bit(3, section.cacheable);
|
||||
entry.0.set_bit(4, !section.exec);
|
||||
assert!(section.domain < 16);
|
||||
entry.0.set_bits(5..=8, section.domain.into());
|
||||
entry.0.set_bits(10..=11, section.access.ap().into());
|
||||
assert!(section.tex < 8);
|
||||
entry.0.set_bits(12..=14, section.tex.into());
|
||||
entry.0.set_bit(15, section.access.apx());
|
||||
entry.0.set_bit(16, section.shareable);
|
||||
entry.0.set_bit(17, !section.global);
|
||||
|
||||
entry
|
||||
}
|
||||
}
|
||||
|
||||
const L1TABLE_SIZE: usize = 4096;
|
||||
|
||||
#[repr(C, align(16384))]
|
||||
pub struct L1Table {
|
||||
table: [L1Entry; L1TABLE_SIZE]
|
||||
}
|
||||
|
||||
impl L1Table {
|
||||
pub fn flat_layout() -> Self {
|
||||
let mut result = L1Table {
|
||||
table: unsafe { uninitialized() }
|
||||
};
|
||||
/* 0x00000000 - 0x00100000 (cacheable) */
|
||||
result.direct_mapped_section(0, L1Section {
|
||||
global: true,
|
||||
shareable: true,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0b101,
|
||||
domain: 0b1111,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
/* (DDR cacheable) */
|
||||
for ddr in 1..=0x1ff {
|
||||
result.direct_mapped_section(ddr, L1Section {
|
||||
global: true,
|
||||
shareable: true,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0b101,
|
||||
domain: 0b1111,
|
||||
exec: true,
|
||||
cacheable: true,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* (unassigned/reserved). */
|
||||
for undef in 0x1ff..=0x3ff {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0x40000000 - 0x7fffffff (FPGA slave0) */
|
||||
for fpga_slave in 0x400..=0x7ff {
|
||||
result.direct_mapped_section(fpga_slave, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0x80000000 - 0xbfffffff (FPGA slave1) */
|
||||
for fpga_slave in 0x800..=0xbff {
|
||||
result.direct_mapped_section(fpga_slave, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xc0000000 - 0xdfffffff (unassigned/reserved). */
|
||||
for undef in 0xc00..=0xdff {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xe0000000 - 0xe02fffff (Memory mapped devices)
|
||||
* UART/USB/IIC/SPI/CAN/GEM/GPIO/QSPI/SD/NAND */
|
||||
for mmapped_dev in 0xe00..=0xe02 {
|
||||
result.direct_mapped_section(mmapped_dev, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xe0300000 - 0xe0ffffff (unassigned/reserved). */
|
||||
for undef in 0xe03..=0xe0f {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xe1000000 - 0xe1ffffff (NAND) */
|
||||
for nand in 0xe10..=0xe1f {
|
||||
result.direct_mapped_section(nand, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xe2000000 - 0xe3ffffff (NOR) */
|
||||
for nor in 0xe20..=0xe3f {
|
||||
result.direct_mapped_section(nor, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xe4000000 - 0xe5ffffff (SRAM) */
|
||||
for nor in 0xe40..=0xe5f {
|
||||
result.direct_mapped_section(nor, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: true,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xe6000000 - 0xf7ffffff (unassigned/reserved). */
|
||||
for undef in 0xe60..=0xf7f {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xf8000000 - 0xf8ffffff (AMBA APB Peripherals) */
|
||||
for apb in 0xf80..=0xf8f {
|
||||
result.direct_mapped_section(apb, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xf9000000 - 0xfbffffff (unassigned/reserved). */
|
||||
for undef in 0xf90..=0xfbf {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xfc000000 - 0xfdffffff (Linear QSPI - XIP) */
|
||||
for qspi in 0xfc0..=0xfdf {
|
||||
result.direct_mapped_section(qspi, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: false,
|
||||
bufferable: true,
|
||||
});
|
||||
}
|
||||
/* 0xfe000000 - 0xffefffff (unassigned/reserved). */
|
||||
for undef in 0xfe0..=0xffe {
|
||||
result.direct_mapped_section(undef, L1Section {
|
||||
global: false,
|
||||
shareable: false,
|
||||
access: AccessPermissions::PermissionFault,
|
||||
tex: 0,
|
||||
domain: 0,
|
||||
exec: false,
|
||||
cacheable: false,
|
||||
bufferable: false,
|
||||
});
|
||||
}
|
||||
/* 0xfff00000 - 0xffffffff (256K OCM when mapped to high address space) */
|
||||
result.direct_mapped_section(0xfff, L1Section {
|
||||
global: true,
|
||||
shareable: false,
|
||||
access: AccessPermissions::FullAccess,
|
||||
tex: 0b100,
|
||||
domain: 0,
|
||||
exec: true,
|
||||
cacheable: true,
|
||||
bufferable: true,
|
||||
});
|
||||
|
||||
result
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
fn direct_mapped_section(&mut self, index: usize, section: L1Section) {
|
||||
assert!(index < L1TABLE_SIZE);
|
||||
|
||||
let base = (index as u32) << 20;
|
||||
self.table[index] = L1Entry::section(base, section);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
pub fn with_mmu<F: FnMut() -> !>(l1table: &L1Table, mut f: F) -> ! {
|
||||
let domains = AccessDomains::all_manager();
|
||||
DACR.write(domains.into());
|
||||
|
||||
let table_base = &l1table.table as *const _ as u32;
|
||||
assert!(table_base & 0x3fff == 0);
|
||||
TTBR0.write(
|
||||
TTBR0::zeroed()
|
||||
.irgn1(true)
|
||||
.s(true)
|
||||
// Outer Cacheable Write-Back, no allocate on write.
|
||||
.rgn(0b11)
|
||||
.irgn0(true)
|
||||
.table_base(table_base >> 14)
|
||||
);
|
||||
|
||||
// Enable I-Cache and D-Cache
|
||||
SCTLR.write(
|
||||
SCTLR::zeroed()
|
||||
.m(true)
|
||||
.a(false)
|
||||
.c(true)
|
||||
.i(true)
|
||||
.unaligned(true)
|
||||
);
|
||||
|
||||
// Synchronization barriers
|
||||
// Allows MMU to start
|
||||
asm::dsb();
|
||||
// Flushes pre-fetch buffer
|
||||
asm::isb();
|
||||
|
||||
f();
|
||||
|
||||
// table must live until here
|
||||
drop(l1table.table);
|
||||
unreachable!();
|
||||
}
|
||||
|
|
@ -1,4 +1,5 @@
|
|||
pub mod asm;
|
||||
pub mod regs;
|
||||
pub mod mmu;
|
||||
|
||||
global_asm!(include_str!("exceptions.s"));
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
use crate::register_bit;
|
||||
use crate::{register_bit, register_bits};
|
||||
use crate::regs::{RegisterR, RegisterW, RegisterRW};
|
||||
|
||||
macro_rules! def_reg_r {
|
||||
|
|
@ -115,6 +115,28 @@ register_bit!(sctlr,
|
|||
/// Thumb Exception Enable
|
||||
te, 30);
|
||||
|
||||
/// Domain Access Control Register
|
||||
pub struct DACR;
|
||||
def_reg_r!(DACR, u32, "mrc p15, 0, $0, c3, c0, 0");
|
||||
def_reg_w!(DACR, u32, "mcr p15, 0, $0, c3, c0, 0");
|
||||
|
||||
/// Translation Table Base Register 0
|
||||
pub struct TTBR0;
|
||||
/// Translation Table Base Register 1
|
||||
pub struct TTBR1;
|
||||
def_reg_r!(TTBR0, ttbr::Read, "mrc p15, 0, $0, c2, c0, 0");
|
||||
def_reg_w!(TTBR0, ttbr::Write, "mcr p15, 0, $0, c2, c0, 0");
|
||||
def_reg_r!(TTBR1, ttbr::Read, "mrc p15, 0, $0, c2, c0, 1");
|
||||
def_reg_w!(TTBR1, ttbr::Write, "mcr p15, 0, $0, c2, c0, 1");
|
||||
wrap_reg!(ttbr);
|
||||
register_bits!(ttbr, table_base, u32, 14, 31);
|
||||
register_bit!(ttbr, irgn0, 6);
|
||||
register_bits!(ttbr, rgn, u8, 3, 4);
|
||||
register_bit!(ttbr,
|
||||
/// Translation table walk to shared memory?
|
||||
s, 1);
|
||||
register_bit!(ttbr, irgn1, 0);
|
||||
|
||||
/// Invalidate TLBs
|
||||
#[inline(always)]
|
||||
pub fn tlbiall() {
|
||||
|
|
|
|||
23
src/main.rs
23
src/main.rs
|
|
@ -4,6 +4,7 @@
|
|||
#![feature(global_asm)]
|
||||
#![feature(naked_functions)]
|
||||
#![feature(compiler_builtins_lib)]
|
||||
#![feature(never_type)]
|
||||
|
||||
use core::fmt::Write;
|
||||
use core::mem::uninitialized;
|
||||
|
|
@ -19,7 +20,7 @@ use uart::Uart;
|
|||
mod eth;
|
||||
|
||||
use crate::regs::{RegisterR, RegisterW};
|
||||
use crate::cortex_a9::{asm, regs::*};
|
||||
use crate::cortex_a9::{asm, regs::*, mmu};
|
||||
|
||||
extern "C" {
|
||||
static mut __bss_start: u32;
|
||||
|
|
@ -51,8 +52,10 @@ unsafe fn boot_core0() -> ! {
|
|||
l1_cache_init();
|
||||
zero_bss(&mut __bss_start, &mut __bss_end);
|
||||
|
||||
mmu::with_mmu(&mmu::L1Table::flat_layout(), || {
|
||||
main();
|
||||
panic!("return from main");
|
||||
});
|
||||
}
|
||||
|
||||
fn l1_cache_init() {
|
||||
|
|
@ -64,24 +67,6 @@ fn l1_cache_init() {
|
|||
bpiall();
|
||||
// Invalidate D-Cache
|
||||
dccisw();
|
||||
|
||||
// (Initialize MMU)
|
||||
|
||||
// Enable I-Cache and D-Cache
|
||||
SCTLR.write(
|
||||
SCTLR::zeroed()
|
||||
.m(false)
|
||||
.a(false)
|
||||
.c(true)
|
||||
.i(true)
|
||||
.unaligned(true)
|
||||
);
|
||||
|
||||
// Synchronization barriers
|
||||
// Allows MMU to start
|
||||
asm::dsb();
|
||||
// Flushes pre-fetch buffer
|
||||
asm::isb();
|
||||
}
|
||||
|
||||
const UART_RATE: u32 = 115_200;
|
||||
|
|
|
|||
Loading…
Reference in New Issue