zynq-rs/szl/src/main.rs

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#![no_std]
#![no_main]
extern crate alloc;
extern crate log;
mod netboot;
use alloc::rc::Rc;
use core::mem;
use core_io::{Read, Seek};
use libboard_zynq::{
self as zynq,
clocks::source::{ArmPll, ClockSource, IoPll},
clocks::Clocks,
logger, println, sdio, slcr,
timer::GlobalTimer,
};
use libconfig::{bootgen, sd_reader, Config};
use libcortex_a9::{
asm::{dsb, isb},
cache::{bpiall, dcciall, iciallu},
enable_fpu,
l2c::enable_l2_cache,
};
use libregister::RegisterR;
use libsupport_zynq::ram;
use log::info;
extern "C" {
static mut __runtime_start: usize;
static mut __runtime_end: usize;
}
fn boot_sd<File: Read + Seek>(
file: &mut Option<File>,
runtime_start: *mut u8,
runtime_max: usize,
) -> Result<(), ()> {
if file.is_none() {
log::error!("No bootgen file");
return Err(());
}
let mut file = file.as_mut().unwrap();
info!("Loading gateware");
bootgen::load_bitstream(&mut file).map_err(|e| log::error!("Cannot load gateware: {:?}", e))?;
info!("Loading runtime");
let runtime =
bootgen::get_runtime(&mut file).map_err(|e| log::error!("Cannot load runtime: {:?}", e))?;
if runtime.len() > runtime_max {
log::error!(
"Runtime binary too large, max {} but got {}",
runtime_max,
runtime.len()
);
}
unsafe {
let target = core::slice::from_raw_parts_mut(runtime_start, runtime.len());
target.copy_from_slice(&runtime);
}
Ok(())
}
#[no_mangle]
pub fn main_core0() {
GlobalTimer::start();
enable_fpu();
logger::init().unwrap();
log::set_max_level(log::LevelFilter::Debug);
println!(
r#"
__________ __
/ ___/__ / / /
\__ \ / / / /
___/ / / /__/ /___
/____/ /____/_____/
(C) 2020 M-Labs
"#
);
info!("Simple Zynq Loader starting...");
enable_l2_cache();
const CPU_FREQ: u32 = 800_000_000;
ArmPll::setup(2 * CPU_FREQ);
Clocks::set_cpu_freq(CPU_FREQ);
IoPll::setup(1_000_000_000);
libboard_zynq::stdio::drop_uart(); // reinitialize UART after clocking change
let mut ddr = zynq::ddr::DdrRam::ddrram();
ram::init_alloc_core0();
let sdio0 = sdio::Sdio::sdio0(true);
let fs = if sdio0.is_card_inserted() {
info!("Card inserted. Mounting file system.");
let sd = sdio::sd_card::SdCard::from_sdio(sdio0).unwrap();
let reader = sd_reader::SdReader::new(sd);
reader
.mount_fatfs(sd_reader::PartitionEntry::Entry1)
.map(|v| Rc::new(v))
.ok()
} else {
info!("No SD card inserted.");
None
};
let fs_ref = fs.as_ref();
let root_dir = fs_ref.map(|fs| fs.root_dir());
let mut bootgen_file = root_dir.and_then(|root_dir| root_dir.open_file("/BOOT.BIN").ok());
let config = Config::from_fs(fs.clone());
unsafe {
let max_len =
&__runtime_end as *const usize as usize - &__runtime_start as *const usize as usize;
match slcr::RegisterBlock::unlocked(|slcr| slcr.boot_mode.read().boot_mode_pins()) {
slcr::BootModePins::Jtag => netboot::netboot(
&mut bootgen_file,
config,
&mut __runtime_start as *mut usize as *mut u8,
max_len,
),
slcr::BootModePins::SdCard => {
if boot_sd(
&mut bootgen_file,
&mut __runtime_start as *mut usize as *mut u8,
max_len,
)
.is_err()
{
log::error!("Error booting from SD card");
log::info!("Fall back on netboot");
netboot::netboot(
&mut bootgen_file,
config,
&mut __runtime_start as *mut usize as *mut u8,
max_len,
)
}
}
v => {
panic!("Boot mode {:?} not supported", v);
}
};
}
info!("Preparing for runtime execution");
// Flush data cache entries for all of L1 cache, including
// Memory/Instruction Synchronization Barriers
dcciall();
iciallu();
bpiall();
dsb();
isb();
// Start core0 only, for compatibility with FSBL.
info!("executing payload");
unsafe {
(mem::transmute::<*mut u8, fn()>(ddr.ptr::<u8>()))();
}
loop {}
}
#[no_mangle]
pub fn main_core1() {
panic!("core1 started but should not have");
}