read/util/
mod.rs

1// SPDX-License-Identifier: MIT
2
3use intel_spi::{Mapper, SpiDev, PhysicalAddress, VirtualAddress};
4
5use std::{fs, ptr};
6
7pub struct LinuxMapper;
8
9impl Mapper for LinuxMapper {
10    unsafe fn map_aligned(&mut self, address: PhysicalAddress, size: usize) -> Result<VirtualAddress, &'static str> {
11        let fd = libc::open(
12            b"/dev/mem\0".as_ptr() as *const libc::c_char,
13            libc::O_RDWR
14        );
15        if fd < 0 {
16            return Err("failed to open /dev/mem")
17        }
18
19        let ptr = libc::mmap(
20            ptr::null_mut(),
21            size,
22            libc::PROT_READ | libc::PROT_WRITE,
23            libc::MAP_SHARED,
24            fd,
25            address.0 as libc::off_t
26        );
27
28        libc::close(fd);
29
30        if ptr == libc::MAP_FAILED {
31            return Err("failed to map /dev/mem");
32        }
33
34        Ok(VirtualAddress(ptr as usize))
35    }
36
37    unsafe fn unmap_aligned(&mut self, address: VirtualAddress, size: usize) -> Result<(), &'static str> {
38        if libc::munmap(address.0 as *mut libc::c_void, size) == 0 {
39            Ok(())
40        } else {
41            Err("failed to unmap /dev/mem")
42        }
43    }
44
45    fn page_size(&self) -> usize {
46        //TODO: get dynamically
47        4096
48    }
49}
50
51pub unsafe fn get_spi() -> SpiDev<'static, LinuxMapper> {
52    static mut LINUX_MAPPER: LinuxMapper = LinuxMapper;
53    let mcfg = fs::read("/sys/firmware/acpi/tables/MCFG").expect("failed to read MCFG");
54    SpiDev::new(&mcfg, &mut LINUX_MAPPER).expect("failed to get SPI device")
55}
read/util/mod.rs

read/util/
mod.rs
