From 1cfbd25dc9eb39467406686c8ae1efbfd5517865 Mon Sep 17 00:00:00 2001 From: Danny Holman Date: Sat, 3 May 2025 13:01:25 -0500 Subject: kernel: x86_64: rename x86 Rename the x86 arch-specific directory to x86_64, reflecting clang's architecture selector flags. Signed-off-by: Danny Holman --- kernel/arch/x86_64/asm/spinlock.s | 46 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 kernel/arch/x86_64/asm/spinlock.s (limited to 'kernel/arch/x86_64/asm/spinlock.s') diff --git a/kernel/arch/x86_64/asm/spinlock.s b/kernel/arch/x86_64/asm/spinlock.s new file mode 100644 index 0000000..1c69820 --- /dev/null +++ b/kernel/arch/x86_64/asm/spinlock.s @@ -0,0 +1,46 @@ +/* + * Copyright (C) 2025 Danny Holman + * + * This file is part of BoxOS, a free and open-source Unix-like operating + * system. + * + * BoxOS is free software; you can redistribute it and/or modify under the + * terms of the GNU General Public License as published by the Free Software + * Foundation; either version 2 of the License, or (at your option) any later + * version. + * + * BoxOS is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; + * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A + * PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * BoxOS; if not, see . + */ + +.section .text + +.global acquire_lock +acquire_lock: + pushq %rbp + movq %rsp, %rbp + + movq $0, %rax + lock bts %rax, (%rdi) +.loop: + pause + testq %rax, %rax + jz .done + jmp .loop +.done: + popq %rbp + ret + +.global release_lock +release_lock: + pushq %rbp + movq %rsp, %rbp + + movq $0, %rax + lock btr %rax, (%rdi) + + ret -- cgit v1.2.3