From d6b373756ddc6de416636f1e2648416f174e9a71 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Sat, 15 Nov 2025 20:48:12 -0500 Subject: kern/amd64: Add panic function + MU helpers This commit introduces a panic function as well as a panic machine unifier layer for MD specifics that help bring the system to a halt. Signed-off-by: Ian Moffett --- sys/arch/amd64/os/os_panic.c | 58 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 sys/arch/amd64/os/os_panic.c (limited to 'sys/arch/amd64/os') diff --git a/sys/arch/amd64/os/os_panic.c b/sys/arch/amd64/os/os_panic.c new file mode 100644 index 0000000..cd55aac --- /dev/null +++ b/sys/arch/amd64/os/os_panic.c @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * PKERNSIBILITY OF SUCH DAMAGE. + */ + +#include +#include + +void +mu_panic_preamble(void) +{ + static uint64_t sync = 0; + + asm volatile( + "cli\n\t" + "mov $1, %%rax\n\t" + "1:\n\t" + " pause\n\t" + " xchg %0, %%rax\n\t" + " or %%rax, %%rax\n\t" + " jnz 1b\n" + : + : "m" (sync) + : "memory" + ); +} + +void +mu_panic_hcf(void) +{ + for (;;) { + asm volatile("cli; hlt"); + } +} -- cgit v1.2.3