74 lines
1.5 KiB
Rust
74 lines
1.5 KiB
Rust
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use core::arch::global_asm;
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use yboot_proto::{
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v1::FramebufferOption, LoadProtocolHeader, LoadProtocolV1, KERNEL_MAGIC, LOADER_MAGIC,
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PROTOCOL_VERSION_1,
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};
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pub const KERNEL_VIRT_OFFSET: usize = 0xFFFFFF8000000000;
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const BOOT_STACK_SIZE: usize = 65536;
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#[repr(C, align(0x20))]
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struct BootStack {
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data: [u8; BOOT_STACK_SIZE],
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}
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#[link_section = ".bss"]
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static mut BSP_STACK: BootStack = BootStack {
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data: [0; BOOT_STACK_SIZE],
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};
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#[used]
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#[link_section = ".data.yboot"]
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static mut YBOOT_DATA: LoadProtocolV1 = LoadProtocolV1 {
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header: LoadProtocolHeader {
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kernel_magic: KERNEL_MAGIC,
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version: PROTOCOL_VERSION_1,
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},
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kernel_virt_offset: KERNEL_VIRT_OFFSET as _,
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opt_framebuffer: FramebufferOption {
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req_width: 1024,
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req_height: 768,
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res_width: 0,
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res_height: 0,
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res_stride: 0,
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res_address: 0,
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},
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};
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extern "C" fn __x86_64_upper_entry() -> ! {
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loop {}
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}
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global_asm!(
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r#"
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.global __x86_64_entry
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.section .text.entry
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__x86_64_entry:
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mov ${yboot_loader_magic}, %edi
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cmp %edi, %eax
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je 2f
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// (Currently) unsupported bootloader
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1:
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cli
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hlt
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jmp 1b
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2:
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// yboot entry method
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movabsq ${stack_bottom} + {stack_size}, %rax
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movabsq ${entry}, %rcx
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mov %rax, %rsp
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jmp *%rcx
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"#,
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yboot_loader_magic = const LOADER_MAGIC,
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stack_size = const BOOT_STACK_SIZE,
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stack_bottom = sym BSP_STACK,
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entry = sym __x86_64_upper_entry,
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options(att_syntax)
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);
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