zynq-rs/libsupport_zynq/src/boot.rs

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use r0::zero_bss;
use core::ptr::write_volatile;
use libregister::{
VolatileCell,
RegisterR, RegisterW, RegisterRW,
};
use libcortex_a9::{asm, regs::*, cache, mmu};
use libboard_zynq::{slcr, mpcore};
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extern "C" {
static mut __bss_start: u32;
static mut __bss_end: u32;
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static mut __stack0_start: u32;
static mut __stack1_start: u32;
fn main_core0();
fn main_core1();
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}
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static mut CORE1_ENABLED: VolatileCell<bool> = VolatileCell::new(false);
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#[link_section = ".text.boot"]
#[no_mangle]
#[naked]
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pub unsafe extern "C" fn Reset() -> ! {
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const CORE_MASK: u32 = 0x3;
match MPIDR.read() & CORE_MASK {
0 => {
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SP.write(&mut __stack0_start as *mut _ as u32);
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boot_core0();
}
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1 => {
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while !CORE1_ENABLED.get() {
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asm::wfe();
}
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SP.write(&mut __stack1_start as *mut _ as u32);
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boot_core1();
}
_ => unreachable!(),
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}
}
#[naked]
#[inline(never)]
unsafe fn boot_core0() -> ! {
l1_cache_init();
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let mpcore = mpcore::RegisterBlock::new();
mpcore.scu_invalidate.invalidate_all_cores();
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zero_bss(&mut __bss_start, &mut __bss_end);
let mmu_table = mmu::L1Table::get()
.setup_flat_layout();
mmu::with_mmu(mmu_table, || {
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mpcore.scu_control.start();
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ACTLR.enable_smp();
// TODO: Barriers reqd when core1 is not yet starting?
asm::dmb();
asm::dsb();
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main_core0();
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panic!("return from main");
});
}
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#[naked]
#[inline(never)]
unsafe fn boot_core1() -> ! {
l1_cache_init();
let mpcore = mpcore::RegisterBlock::new();
mpcore.scu_invalidate.invalidate_core1();
let mmu_table = mmu::L1Table::get();
mmu::with_mmu(mmu_table, || {
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ACTLR.enable_smp();
// TODO: Barriers reqd when core1 is not yet starting?
asm::dmb();
asm::dsb();
main_core1();
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panic!("return from main_core1");
});
}
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fn l1_cache_init() {
use libcortex_a9::cache::*;
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// Invalidate TLBs
tlbiall();
// Invalidate I-Cache
iciallu();
// Invalidate Branch Predictor Array
bpiall();
// Invalidate D-Cache
//
// NOTE: It is both faster and correct to only invalidate instead
// of also flush the cache (as was done before with
// `dccisw()`) and it is correct to perform this operation
// for all of the L1 data cache rather than a (previously
// unspecified) combination of one cache set and one cache
// way.
dciall();
}
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pub struct Core1 {
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}
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impl Core1 {
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/// Reset and start core1
pub fn start(sdram: bool) -> Self {
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// reset and stop (safe to repeat)
slcr::RegisterBlock::unlocked(|slcr| {
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_rst1(true));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_clkstop1(true));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_rst1(false));
});
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if sdram {
// Cores always start from OCM no matter what you do.
// Make up a vector table there that just jumps to SDRAM.
for i in 0..8 {
unsafe {
// this is the ARM instruction "b +0x00100000"
write_volatile((i*4) as *mut u32, 0xea03fffe);
}
}
}
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unsafe {
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CORE1_ENABLED.set(true);
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}
// Ensure values have been written to cache
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asm::dmb();
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// Flush cache-line
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cache::dccmvac(unsafe { &CORE1_ENABLED } as *const _ as usize);
if sdram {
cache::dccmvac(0);
}
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// wake up core1
slcr::RegisterBlock::unlocked(|slcr| {
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_rst1(false));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_clkstop1(false));
});
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Core1 {}
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}
pub fn disable(&self) {
unsafe {
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CORE1_ENABLED.set(false);
}
self.restart();
}
pub fn restart(&self) {
slcr::RegisterBlock::unlocked(|slcr| {
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_rst1(true));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_clkstop1(true));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_rst1(false));
slcr.a9_cpu_rst_ctrl.modify(|_, w| w.a9_clkstop1(false));
});
}
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}