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feat(adapter): higher-half kernel (linked at PHYS_OFFSET, boot trampoline, no low mappings), fix SBI ecall clobbers

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This commit is contained in:
Gabriel Kaszewski
2026-10-27 00:25:20 +01:00
parent 55758ae5b2
commit b87a62475f
20 changed files with 208 additions and 143 deletions
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34
crates/adapter-riscv/src/hw/virtio_blk.rs
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@@ -1,3 +1,4 @@
use crate::mmu::{phys_to_virt, virt_to_phys};
use hw_virtio::block::{self, DmaAddrs};
use hw_virtio::mmio::{self, DirectMmio};
use hw_virtio::queue::{QUEUE_SIZE, QueueAddrs, VirtioQueue};
@@ -27,27 +28,38 @@ pub struct VirtioBlk {
impl VirtioBlk {
pub fn probe() -> Option<Self> {
let mmio = mmio::scan_for_device(mmio::DEVICE_ID_BLOCK)?;
let mmio = mmio::scan_for_device(phys_to_virt(mmio::MMIO_FIRST), mmio::DEVICE_ID_BLOCK)?;
let vq_phys = core::ptr::addr_of!(VQUEUE) as usize;
mmio::init_legacy_device(&mmio, vq_phys, QUEUE_SIZE as u32);
// The device sees physical addresses; the CPU uses kernel ones.
let vq_va = core::ptr::addr_of!(VQUEUE) as usize;
mmio::init_legacy_device(&mmio, virt_to_phys(vq_va), QUEUE_SIZE as u32);
let queue = VirtioQueue::new(QueueAddrs::from_base(vq_phys));
let queue = VirtioQueue::new(QueueAddrs::from_base(vq_va));
let pair = |va: usize| {
(
PhysicalAddress::from_raw(virt_to_phys(va)),
VirtualAddress::from_raw(va),
)
};
let (header_pa, header_va) = pair(core::ptr::addr_of_mut!(REQ_HEADER) as usize);
let (status_pa, status_va) = pair(core::ptr::addr_of_mut!(REQ_STATUS) as usize);
let (data_pa, data_va) = pair(core::ptr::addr_of_mut!(SECTOR_BUF) as usize);
let dma = DmaAddrs {
header_pa: PhysicalAddress::from_raw(core::ptr::addr_of!(REQ_HEADER) as usize),
header_va: VirtualAddress::from_raw(core::ptr::addr_of_mut!(REQ_HEADER) as usize),
status_pa: PhysicalAddress::from_raw(core::ptr::addr_of!(REQ_STATUS) as usize),
status_va: VirtualAddress::from_raw(core::ptr::addr_of_mut!(REQ_STATUS) as usize),
data_pa: PhysicalAddress::from_raw(core::ptr::addr_of!(SECTOR_BUF) as usize),
data_va: VirtualAddress::from_raw(core::ptr::addr_of_mut!(SECTOR_BUF) as usize),
header_pa,
header_va,
status_pa,
status_va,
data_pa,
data_va,
};
Some(Self { mmio, queue, dma })
}
/// Physical address of the device's MMIO window.
pub fn base(&self) -> usize {
self.mmio.base()
virt_to_phys(self.mmio.base())
}
pub fn read_sector(&mut self, sector: u32, buf: &mut [u8; SECTOR_SIZE]) -> bool {