Gabriel Kaszewski
25824a01fe
VirtIO GPU: - Removed QEMU 11.x command type swap hack (0x0104↔0x0106). The hack was wrong — swapping types without swapping data formats meant handlers read wrong struct layouts. Commands returned OK but did nothing. - Restored correct VirtIO spec command types. - Removed broken test pattern (fill + flush that never displayed). - GPU setup now reports success/failure without crashing. Display server resilience: - VirtioFramebuffer::new() → try_new() -> Option<Self>. Returns None if phys-info page is unmapped or has zero dimensions. - bins/display-qemu: tries VirtioFramebuffer, falls back to MockFramebuffer. Display server runs headless instead of crashing. - No more page faults when GPU is absent. The GPU driver code is architecturally correct (proper VirtIO commands, proper data formats) but doesn't produce visible output on QEMU 11.x due to a suspected QEMU legacy MMIO bug where transfer_to_host_2d succeeds but doesn't transfer data. The driver is ready for when this is fixed or a different QEMU version is used.
26 lines
718 B
Rust
26 lines
718 B
Rust
#![no_std]
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#![no_main]
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extern crate userspace_rt;
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use types::bounded::CapSlot;
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#[unsafe(no_mangle)]
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extern "C" fn main() {
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let ep = CapSlot::const_new(0);
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if let Some(fb) = driver_framebuffer_virtio::VirtioFramebuffer::try_new() {
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let mut srv = display_server::server::DisplayServer::new(fb);
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server_framework::serve(&mut srv, ep);
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} else {
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let fb = driver_framebuffer_mock::MockFramebuffer::new(
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types::display::Dimension::new(640),
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types::display::Dimension::new(480),
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);
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let mut srv = display_server::server::DisplayServer::new(fb);
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server_framework::serve(&mut srv, ep);
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}
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loop { userspace::syscall::yield_now(); }
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}
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