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mem: starting to get memory manager working

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Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-12-24 09:33:02 +08:00
parent 9a4d002832
commit 8521093f6d
8 changed files with 217 additions and 71 deletions
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40
Cargo.lock generated
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@ -55,16 +55,6 @@ name = "rand_core"
version = "0.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "riscv-rt-macros"
version = "0.1.6"
dependencies = [
"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "rustc_version"
version = "0.2.3"
@ -105,8 +95,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
name = "xous-kernel"
version = "0.1.0"
dependencies = [
"xous-kernel-riscv-rt 0.6.1",
"xous-riscv 0.5.4",
"xous-riscv-rt 0.6.1",
]
[[package]]
name = "xous-kernel-riscv-rt"
version = "0.6.1"
dependencies = [
"r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"xous-kernel-riscv-rt-macros 0.1.6",
"xous-riscv 0.5.4",
]
[[package]]
name = "xous-kernel-riscv-rt-macros"
version = "0.1.6"
dependencies = [
"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -117,15 +126,6 @@ dependencies = [
"bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "xous-riscv-rt"
version = "0.6.1"
dependencies = [
"r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"riscv-rt-macros 0.1.6",
"xous-riscv 0.5.4",
]
[metadata]
"checksum bare-metal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a3caf393d93b2d453e80638d0674597020cef3382ada454faacd43d1a55a735a"
"checksum bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ed8765909f9009617974ab6b7d332625b320b33c326b1e9321382ef1999b5d56"

6
memory.x
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@ -9,8 +9,10 @@ REGION_ALIAS("REGION_TEXT", FLASH);
REGION_ALIAS("REGION_RODATA", FLASH);
REGION_ALIAS("REGION_DATA", RAM);
REGION_ALIAS("REGION_BSS", RAM);
REGION_ALIAS("REGION_HEAP", RAM);
REGION_ALIAS("REGION_STACK", RAM);
REGION_ALIAS("REGION_HEAP", RAM);
_lcdfb = ORIGIN(MEMLCD);
_heap_size = LENGTH(RAM) - 1M;
/* Size of the main kernel stack */
_stack_size = 16K;
_eheap = ORIGIN(RAM) + LENGTH(RAM);

35
src/irq.rs
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@ -1,40 +1,7 @@
use crate::syscalls;
use crate::filled_array;
use xous_riscv::register::{mstatus, vmim};
// Shamelessly taken from
// https://stackoverflow.com/questions/36258417/using-a-macro-to-initialize-a-big-array-of-non-copy-elements
// Allows us to fill an array with a predefined value.
macro_rules! filled_array {
(@accum (0, $($_es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@as_expr [$($body)*])};
(@accum (1, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)*))};
(@accum (2, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
(@accum (3, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (2, $($es),*) -> ($($body)* $($es,)*))};
(@accum (4, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (2, $($es,)* $($es),*) -> ($($body)*))};
(@accum (5, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)*))};
(@accum (6, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
(@accum (7, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)* $($es,)*))};
(@accum (8, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es,)* $($es),*) -> ($($body)*))};
(@accum (16, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (8, $($es,)* $($es),*) -> ($($body)*))};
(@accum (32, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (16, $($es,)* $($es),*) -> ($($body)*))};
(@accum (64, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (32, $($es,)* $($es),*) -> ($($body)*))};
(@as_expr $e:expr) => {$e};
[$e:expr; $n:tt] => { filled_array!(@accum ($n, $e) -> ()) };
}
static mut IRQ_HANDLERS: [Option<fn(usize)>; 32] = filled_array![None; 32];
pub fn handle(irqs_pending: usize) {

10
src/lib.rs
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@ -2,11 +2,11 @@
extern crate xous_riscv;
use core::panic::PanicInfo;
#[panic_handler]
fn handle_panic(_arg: &PanicInfo) -> ! {
loop {}
}
// use core::panic::PanicInfo;
// #[panic_handler]
// fn handle_panic(_arg: &PanicInfo) -> ! {
// loop {}
// }
// Allow consumers of this library to make syscalls
pub mod syscalls;

46
src/macros.rs Normal file
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@ -0,0 +1,46 @@
// Shamelessly taken from
// https://stackoverflow.com/questions/36258417/using-a-macro-to-initialize-a-big-array-of-non-copy-elements
// Allows us to fill an array with a predefined value.
#[macro_export]
macro_rules! filled_array {
(@accum (0, $($_es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@as_expr [$($body)*])};
(@accum (1, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)*))};
(@accum (2, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
(@accum (3, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (2, $($es),*) -> ($($body)* $($es,)*))};
(@accum (4, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (2, $($es,)* $($es),*) -> ($($body)*))};
(@accum (5, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)*))};
(@accum (6, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
(@accum (7, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)* $($es,)*))};
(@accum (8, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (4, $($es,)* $($es),*) -> ($($body)*))};
(@accum (16, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (8, $($es,)* $($es),*) -> ($($body)*))};
(@accum (32, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (16, $($es,)* $($es),*) -> ($($body)*))};
(@accum (64, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (32, $($es,)* $($es),*) -> ($($body)*))};
(@accum (128, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (64, $($es,)* $($es),*) -> ($($body)*))};
(@accum (256, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (128, $($es,)* $($es),*) -> ($($body)*))};
(@accum (512, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (256, $($es,)* $($es),*) -> ($($body)*))};
(@accum (1024, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (512, $($es,)* $($es),*) -> ($($body)*))};
(@accum (2048, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (1024, $($es,)* $($es),*) -> ($($body)*))};
(@accum (4096, $($es:expr),*) -> ($($body:tt)*))
=> {filled_array!(@accum (2048, $($es,)* $($es),*) -> ($($body)*))};
(@as_expr $e:expr) => {$e};
[$e:expr; $n:tt] => { filled_array!(@accum ($n, $e) -> ()) };
}

4
src/main.rs
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@ -4,12 +4,15 @@
extern crate xous_riscv;
mod syscalls;
mod irq;
mod macros;
mod mem;
pub use irq::sys_interrupt_claim;
use core::panic::PanicInfo;
use xous_kernel_riscv_rt::xous_kernel_entry;
use xous_riscv::register::{mcause, mstatus, mie, vmim, vmip};
use mem::MemoryManager;
#[panic_handler]
@ -32,6 +35,7 @@ fn xous_main() -> ! {
mie::set_mext();
mstatus::set_mie(); // Enable CPU interrupts
}
let mm = MemoryManager::new();
sys_interrupt_claim(2, |_| {
let uart_ptr = 0xE000_1800 as *mut usize;
print_str(uart_ptr, "hello, world!\r\n");

127
src/mem.rs Normal file
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@ -0,0 +1,127 @@
use crate::syscalls::{XousError, XousPid};
use xous_riscv::register::mstatus;
const FLASH_START: usize = 0x20000000;
const FLASH_SIZE: usize = 16_777_216;
const FLASH_END: usize = FLASH_START + FLASH_SIZE;
const RAM_START: usize = 0x40000000;
const RAM_SIZE: usize = 16_777_216;
const RAM_END: usize = RAM_START + RAM_SIZE;
const IO_START: usize = 0xe0000000;
const IO_SIZE: usize = 65_536;
const IO_END: usize = IO_START + IO_SIZE;
const LCD_START: usize = 0xB0000000;
const LCD_SIZE: usize = 32_768;
const LCD_END: usize = LCD_START + LCD_SIZE;
const PAGE_SIZE: usize = 4096;
const FLASH_PAGE_COUNT: usize = FLASH_SIZE / PAGE_SIZE;
const RAM_PAGE_COUNT: usize = RAM_SIZE / PAGE_SIZE;
const IO_PAGE_COUNT: usize = IO_SIZE;
const LCD_PAGE_COUNT: usize = LCD_SIZE / PAGE_SIZE;
pub struct MemoryManager {
flash: [u8; FLASH_PAGE_COUNT],
ram: [u8; RAM_PAGE_COUNT],
io: [u8; IO_PAGE_COUNT],
lcd: [u8; LCD_PAGE_COUNT],
}
extern "C" {
// Boundaries of the .bss section
static mut _ebss: usize;
static mut _sbss: usize;
// Boundaries of the .data section
static mut _edata: usize;
static mut _sdata: usize;
// Boundaries of the stack
static mut _estack: usize;
static mut _sstack: usize;
// Boundaries of the heap
static _sheap: usize;
static _eheap: usize;
// Initial values of the .data section (stored in Flash)
static _sidata: usize;
}
use core::mem::transmute;
/// Initialzie the memory map.
/// This will go through memory and map anything that the kernel is
/// using to process 0xff, then allocate a pagetable for this process
/// and place it at the usual offset.
/// Finally, it will enable the MMU.
impl MemoryManager {
pub fn new() -> MemoryManager {
let mut mm = MemoryManager {
flash: [0; FLASH_PAGE_COUNT],
ram: [0; RAM_PAGE_COUNT],
io: [0; IO_PAGE_COUNT],
lcd: [0; LCD_PAGE_COUNT],
};
unsafe { mstatus::clear_mie() };
// Map the bss section
let start_bss = unsafe { transmute::<&usize, usize>(&_sbss) };
let end_bss = unsafe { transmute::<&usize, usize>(&_ebss) };
let bss_range = (start_bss..end_bss).step_by(PAGE_SIZE);
let start_data = unsafe { transmute::<&usize, usize>(&_sdata) };
let end_data = unsafe { transmute::<&usize, usize>(&_edata) };
let data_range = (start_data..end_data).step_by(PAGE_SIZE);
// Note: stack grows downwards so these are swapped.
let start_stack = unsafe { transmute::<&usize, usize>(&_estack) };
let end_stack = unsafe { transmute::<&usize, usize>(&_sstack) };
let stack_range = (start_stack..end_stack).step_by(PAGE_SIZE);
for region in bss_range {
mm.claim_page(region & !0xfff, 1).unwrap();
}
for region in data_range {
mm.claim_page(region & !0xfff, 1).unwrap();
}
for region in stack_range {
mm.claim_page(region & !0xfff, 1).unwrap();
}
unsafe { mstatus::set_mie() };
mm
}
fn claim_page(&mut self, addr: usize, pid: XousPid) -> Result<(), XousError> {
// Ensure the address lies on a page boundary
if addr & 0xfff != 0 {
return Err(XousError::BadAlignment);
}
match addr {
FLASH_START..=FLASH_END => {
Self::claim_page_inner(&mut self.flash, addr - FLASH_START, pid)
}
RAM_START..=RAM_END => Self::claim_page_inner(&mut self.ram, addr - RAM_START, pid),
IO_START..=IO_END => Self::claim_page_inner(&mut self.io, addr - IO_START, pid),
LCD_START..=LCD_END => Self::claim_page_inner(&mut self.lcd, addr - LCD_START, pid),
_ => Err(XousError::BadAddress),
}
}
fn claim_page_inner(tbl: &mut [u8], addr: usize, pid: XousPid) -> Result<(), XousError> {
let page = addr / PAGE_SIZE;
if page > tbl.len() {
return Err(XousError::BadAddress);
}
if tbl[page] != 0 {
return Err(XousError::OutOfMemory);
}
tbl[page] = pid;
Ok(())
}
}

20
xous-kernel-riscv-rt/link.x
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@ -74,23 +74,23 @@ SECTIONS
_ebss = .;
} > REGION_BSS
/* fictitious region that represents the memory available for the heap */
.heap (NOLOAD) :
{
_sheap = .;
. += _heap_size;
. = ALIGN(4);
_eheap = .;
} > REGION_HEAP
/* fictitious region that represents the memory available for the stack */
.stack (NOLOAD) :
{
_estack = .;
. = _stack_start;
PROVIDE(_stack_start = .);
. += _stack_size;
_sstack = .;
} > REGION_STACK
/* fictitious region that represents the memory available for the heap */
.heap (NOLOAD) :
{
. = ALIGN(4);
_sheap = .;
/* _eheap is defined elsewhere and is the remainder of RAM */
} > REGION_HEAP
/* fake output .got section */
/* Dynamic relocations are unsupported. This section is only used to detect
relocatable code in the input files and raise an error if relocatable code