mirror of
https://github.com/xomboverlord/xomb.git
synced 2026-01-10 01:36:37 +01:00
c6fa2895e2
Core kernel infrastructure: - Multiboot2 boot with GRUB, long mode setup, higher-half kernel - Serial port output for debugging - Unified boot info abstraction for future UEFI support Memory management: - Physical frame allocator with bitmap tracking - Page table manipulation via recursive mapping (PML4[510]) - Support for 4KB, 2MB, and 1GB page mappings - TLB invalidation and proper NXE support Build system: - Cargo-based build with custom x86_64 target - Makefile for QEMU and Bochs testing - GRUB ISO generation for multiboot2 boot
96 lines
2.3 KiB
Plaintext
96 lines
2.3 KiB
Plaintext
/* Linker script for XOmB multiboot2 kernel (higher-half) */
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ENTRY(_start)
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/* Physical load address (standard location for multiboot) */
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KERNEL_PHYS = 0x100000;
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/* Virtual address base (top 2GB for kernel code model compatibility) */
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KERNEL_VIRT = 0xFFFFFFFF80000000;
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SECTIONS
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{
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/* ===== Boot sections at physical addresses ===== */
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/* These run before paging maps the higher-half */
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. = KERNEL_PHYS;
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_kernel_phys_start = .;
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/* Multiboot2 header must be in the first 32KB of the file */
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.multiboot2_header : ALIGN(8)
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{
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KEEP(*(.multiboot2_header))
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}
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/* Boot code (32-bit startup and 64-bit trampoline) */
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/* Must be at physical address for initial execution */
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.text.boot : ALIGN(4096)
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{
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*(.text.boot)
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}
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/* Record end of low-memory boot sections */
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. = ALIGN(4096);
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_boot_end_phys = .;
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/* ===== Kernel sections at higher-half virtual addresses ===== */
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/* Calculate physical address where higher-half sections will be loaded */
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_higher_half_phys = .;
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/* Switch to higher-half virtual addresses */
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. = KERNEL_VIRT + _higher_half_phys;
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/* Main kernel code */
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.text : AT(_higher_half_phys)
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{
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_text_start = .;
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*(.text .text.*)
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_text_end = .;
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}
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/* Read-only data - use ALIGN to ensure proper separation */
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. = ALIGN(4096);
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.rodata : AT(_higher_half_phys + (. - (KERNEL_VIRT + _higher_half_phys)))
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{
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_rodata_start = .;
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*(.rodata .rodata.*)
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_rodata_end = .;
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}
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/* Initialized data */
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. = ALIGN(4096);
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.data : AT(_higher_half_phys + (. - (KERNEL_VIRT + _higher_half_phys)))
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{
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_data_start = .;
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*(.data .data.*)
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_data_end = .;
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}
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/* BSS (uninitialized data) */
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. = ALIGN(4096);
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.bss (NOLOAD) : AT(_higher_half_phys + (. - (KERNEL_VIRT + _higher_half_phys)))
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{
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_bss_start = .;
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__bss_start = .;
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*(.bss .bss.*)
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*(.bss.stack)
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*(COMMON)
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__bss_end = .;
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_bss_end = .;
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}
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/* Kernel end markers */
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. = ALIGN(4096);
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_kernel_virt_end = .;
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_kernel_phys_end = _higher_half_phys + (. - (KERNEL_VIRT + _higher_half_phys));
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/* Discard unnecessary sections */
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/DISCARD/ :
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{
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*(.comment)
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*(.note.*)
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*(.eh_frame*)
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}
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}
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