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Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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1. allow unexpected cfgs in lib.rs, in this case
"no_global_oom_handling" is cause warnings [1]
2. for large code models the compiler (rust linkers) now put code and
data in `.ltext`, `.ldata`, `.lbss`, `.lrodata` instead of the
same `.text` , `.data` ... etc. We are adjusting accordingly in the
linker script.
3. unsafe assertions identified undefined behaviours, in this case a repr(C)
struct was not mared as repr(packed), therefore having an unexpected
size. The unsafe assertions was not enabled by default in debug
builds so the idt setup code with from_raw_parts_mut() has been
working on UB. Glad we can catch this....
related: [1] https://github.com/rust-lang/rust/pull/123501
related: [2] https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#asserting-unsafe-preconditions
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Also renamed a few symbols to avoid confusion.
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the x86_64 crate is pretty solid and has a permissive license
(Apache/MIT), but I want to make this myself in the future to
"experience" the unsafe rust further....Also it has too many
abstractions, which is justified as a library, but not ideal for a from
sctrach toy OS as it hides the lower end.
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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use 8MiB reserved array to manage up to 4GiB of physical memory
(4K Pages only)
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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well, it's not trivial to use bios function because thanks to grub +
multiboot, we are already in protected mode when the startup code takes
control. Also the MB info is easier to play with than BIOS (or ACPI)
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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works on qemu, untested on real machine
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The rust lazy_static requires interior mutability. I have to include a
Mutex impl (spin::Mutex). But I'd like to implement my own primitives.
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to make the linter shutup.... You stupid linter, this is a new project!
ofc there are stuffs defined not used.... I'll let you do the job when I
finish... :(
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