uefi-services: Change SYSTEM_TABLE to an atomic pointer #977
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Add `system_table_opt` as the only direct read of `SYSTEM_TABLE`. Replace reads of the global with either `system_table_opt` or `system_table`.
This aligns with how the std uefi target works: https://github.com/rust-lang/rust/blob/f654229c27267334023a22233795b88b75fc340e/library/std/src/os/uefi/env.rs#L8 And also avoids some unsafe; a static atomic be written without being `static mut`, and reads and writes are safe operations.
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This aligns with how the std uefi target works:
https://github.com/rust-lang/rust/blob/f654229c27267334023a22233795b88b75fc340e/library/std/src/os/uefi/env.rs#L8
And also avoids some unsafe; a static atomic be written without being
static mut, and reads and writes are safe operations.Also includes some related cleanups in uefi-services, and the addition of
SystemTable::as_ptr.Checklist