ptos/amd64+ke: Add bugcheck support

Signed-off-by: Chloe M <chloe@mensia.org>
2026-07-11 00:21:45 -04:00
parent 686f8daf8b
commit 9c91a4d8e3
3 changed files with 141 additions and 0 deletions
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: AMD64 bugcheck wrapper
+ * Author:      Chloe M.
+ */
+
+    .text
+    .globl KeBugCheck
+KeBugCheck:
+    cli                 /* Disable interrupts */
+    cld                 /* Just in case */
+    mov $1, %rax        /* Prep the lock */
+    xchg %rax, MpLock   /* Acquire the lock */
+    or %rax, %rax       /* Are we another core? */
+    jnz .LockOut        /* Yes, lock out */
+
+    /*
+     * During most cases in which an interrupt occurs, the processor
+     * is to automatically switch to its own interrupt stack and during
+     * such cases it is guaranteed that the stack is safe. However, we still
+     * cannot trust the stack as we do not know if we are coming from an interrupt
+     * or not and thus need to update it to avoid dodgy states from worsening our
+     * problem... Whatever it is...
+     */
+    lea StackTop(%rip), %rsp
+
+    /* From here we can call the actual bugcheck handler */
+    call KiBugCheck
+.LockOut:
+    hlt
+    jmp .LockOut
+
+    .section .data
+MpLock: .quad 0
+
+/* Our bugcheck stack */
+Stack:  .fill 4096, 1, 0
+StackTop: