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feat: Enable EL0 basic mailbox access via SVCs

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This commit is contained in:
Alexander Neuhäuser
2026-03-21 18:21:32 +01:00
parent aed9c39283
commit 6c36d88b48
8 changed files with 224 additions and 181 deletions
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16
src/pi3/mailbox.rs
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@@ -1,4 +1,9 @@
use crate::{read_address, write_address};
use core::slice;
use crate::{
aarch64::mmu::GRANULARITY, configuration::memory_mapping::MAILBOX_PHYSICAL_ADDRESS,
configuration::memory_mapping::MAILBOX_VIRTUAL_ADDRESS, read_address, write_address,
};
use nova_error::NovaError;
const MBOX_BASE: u32 = 0x3F00_0000 + 0xB880;
@@ -31,8 +36,9 @@ macro_rules! mailbox_command {
pub fn $name(
request_data: [u32; $request_len / 4],
) -> Result<[u32; $response_len / 4], NovaError> {
let mut mailbox =
[0u32; (HEADER_LENGTH + max!($request_len, $response_len) + FOOTER_LENGTH) / 4];
let mailbox = unsafe {
slice::from_raw_parts_mut(MAILBOX_VIRTUAL_ADDRESS as *mut u32, GRANULARITY / 4)
};
mailbox[0] = (HEADER_LENGTH + max!($request_len, $response_len) + FOOTER_LENGTH) as u32; // Total length in Bytes
mailbox[1] = 0; // Request
mailbox[2] = $tag; // Command Tag
@@ -42,9 +48,9 @@ macro_rules! mailbox_command {
mailbox[5..(5 + ($request_len / 4))].copy_from_slice(&request_data);
mailbox[(5 + ($request_len / 4))..].fill(0);
let addr = core::ptr::addr_of!(mailbox[0]) as u32;
//let addr = core::ptr::addr_of!(mailbox[0]) as u32;
write_mailbox(8, addr);
write_mailbox(8, unsafe { MAILBOX_PHYSICAL_ADDRESS.unwrap() } as u32);
let _ = read_mailbox(8);