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| author | Felix Morgner <felix.morgner@ost.ch> | 2025-07-22 21:23:23 +0000 |
|---|---|---|
| committer | Felix Morgner <felix.morgner@ost.ch> | 2025-07-22 21:23:23 +0000 |
| commit | c8cb4346064c69ab8431aa0d3c287e2fad60ce80 (patch) | |
| tree | e3677c3728a6a78e7560b732726505695849ebf2 /arch/x86_64/src/boot | |
| parent | ce8683e63fc9ef59e1800927afb1753507a42ef6 (diff) | |
| download | teachos-c8cb4346064c69ab8431aa0d3c287e2fad60ce80.tar.xz teachos-c8cb4346064c69ab8431aa0d3c287e2fad60ce80.zip | |
x86_64: split bootstrap code along mode lines
Diffstat (limited to 'arch/x86_64/src/boot')
| -rw-r--r-- | arch/x86_64/src/boot/boot32.S (renamed from arch/x86_64/src/boot/boot.S) | 23 | ||||
| -rw-r--r-- | arch/x86_64/src/boot/entry64.s | 21 |
2 files changed, 25 insertions, 19 deletions
diff --git a/arch/x86_64/src/boot/boot.S b/arch/x86_64/src/boot/boot32.S index d65c865..7e6c2ae 100644 --- a/arch/x86_64/src/boot/boot.S +++ b/arch/x86_64/src/boot/boot32.S @@ -31,6 +31,8 @@ stack_top: */ .section .boot_rodata, "a", @progbits +.global global_descriptor_table_data + /** * @brief A basic GDT for long mode. */ @@ -106,6 +108,7 @@ vga_buffer_pointer: .quad 0xb8000 * @param %ebx The Multiboot 2 information pointer. * @return void This function does not return. */ +.global _start _start: call 0f 0: @@ -127,7 +130,7 @@ _start: call _enable_sse call _reload_gdt - lea (_transition_to_long_mode - 0b)(%esi), %eax + lea (_entry64 - 0b)(%esi), %eax pushl $global_descriptor_table_code pushl %eax lret @@ -413,21 +416,3 @@ _reload_gdt: add $10, %esp pie_function_end - -.section .boot_text, "ax", @progbits -.code64 - -_transition_to_long_mode: - mov $global_descriptor_table_data, %rax - mov %rax, %ss - mov %rax, %ds - mov %rax, %es - mov %rax, %fs - mov %rax, %gs - - xor %rax, %rax - - call _init - - call main - call _halt diff --git a/arch/x86_64/src/boot/entry64.s b/arch/x86_64/src/boot/entry64.s new file mode 100644 index 0000000..f575c50 --- /dev/null +++ b/arch/x86_64/src/boot/entry64.s @@ -0,0 +1,21 @@ +.section .boot_text, "ax", @progbits +.code64 + +.global _entry64 +_entry64: + mov $global_descriptor_table_data, %rax + mov %rax, %ss + mov %rax, %ds + mov %rax, %es + mov %rax, %fs + mov %rax, %gs + + xor %rax, %rax + + call _init + + call main + +1: + hlt + jmp 1b |