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rust: chardev: provide basic bindings to character devices

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Most of the character device API is pretty simple, with "0 or -errno"
or "number of bytes or -errno" as the convention for return codes.
Add safe wrappers for the API to the CharBackend bindgen-generated
struct.

The API is not complete, but it covers the parts that are used
by the PL011 device, plus qemu_chr_fe_write which is needed to
implement the standard library Write trait.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-02-14 12:41:14 +01:00
parent 2ad011d466
commit 2d0050cbe2
3 changed files with 255 additions and 5 deletions
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1
rust/qemu-api/src/zeroable.rs
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@ -106,3 +106,4 @@ impl_zeroable!(crate::bindings::MemoryRegionOps__bindgen_ty_1);
impl_zeroable!(crate::bindings::MemoryRegionOps__bindgen_ty_2);
impl_zeroable!(crate::bindings::MemoryRegionOps);
impl_zeroable!(crate::bindings::MemTxAttrs);
impl_zeroable!(crate::bindings::CharBackend);