46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
use std::process;
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use redox_driver_sys::dma::DmaBuffer;
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fn run() -> Result<(), String> {
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println!("=== Red Bear OS DMA Runtime Check ===");
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let mut one_page =
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DmaBuffer::allocate(4096, 4096).map_err(|err| format!("alloc 4K failed: {err}"))?;
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println!(
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"dma_4k cpu={:#x} phys={:#x} len={:#x}",
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one_page.as_ptr() as usize,
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one_page.physical_address(),
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one_page.len()
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);
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unsafe {
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(one_page.as_mut_ptr() as *mut u32).write_volatile(0x1122_3344);
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let value = (one_page.as_ptr() as *const u32).read_volatile();
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println!("dma_4k_value={:#x}", value);
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}
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let mut two_page =
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DmaBuffer::allocate(8192, 4096).map_err(|err| format!("alloc 8K failed: {err}"))?;
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println!(
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"dma_8k cpu={:#x} phys={:#x} len={:#x}",
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two_page.as_ptr() as usize,
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two_page.physical_address(),
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two_page.len()
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);
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unsafe {
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let second_page = two_page.as_mut_ptr().add(4096) as *mut u32;
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second_page.write_volatile(0x5566_7788);
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let value = (two_page.as_ptr().add(4096) as *const u32).read_volatile();
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println!("dma_8k_second_page_value={:#x}", value);
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}
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Ok(())
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}
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fn main() {
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if let Err(err) = run() {
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eprintln!("redbear-phase-dma-check: {err}");
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process::exit(1);
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}
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}
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