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feat(adapter-riscv): load init from VirtIO block device with FAT16 filesystem

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Adapter probes for VirtIO block device, reads init.elf from FAT16 disk,
parses ELF, maps into userspace, and launches. Falls back to embedded
minimal init if no disk is present.

Also: VirtIO MMIO driver, boot FAT16 reader, disk image build script,
Makefile targets for build/run/run-disk.
This commit is contained in:
Gabriel Kaszewski
2026-10-18 04:19:19 +02:00
parent a910c06cf7
commit d43c6a7e74
8 changed files with 586 additions and 93 deletions
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2
crates/adapter-riscv/src/board.rs
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@@ -1,6 +1,8 @@
pub const RAM_BASE: usize = 0x80000000;
pub const RAM_SIZE: usize = 128 * 1024 * 1024;
pub const UART_BASE: usize = 0x10000000;
pub const VIRTIO_BASE: usize = 0x10001000;
pub const VIRTIO_SIZE: usize = 0x8000;
pub const PLIC_BASE: usize = 0x0C000000;
pub const CLINT_BASE: usize = 0x02000000;
pub const USER_POOL_BASE: usize = 0x84000000;