Unifying the Lunaix's Physical Memory Model (#28)

[lunaix-os.git] / lunaix-os / arch / i386 / includes / sys / failsafe.h

diff --git a/lunaix-os/arch/i386/includes/sys/failsafe.h b/lunaix-os/arch/i386/includes/sys/failsafe.h
new file mode 100644 (file)
index 0000000..149efd2
--- /dev/null
+++ b/lunaix-os/arch/i386/includes/sys/failsafe.h
@@ -0,0 +1,43 @@
+#ifndef __LUNAIX_ARCH_FAILSAFE_H
+#define __LUNAIX_ARCH_FAILSAFE_H
+
+#define STACK_SANITY            0xbeefc0de
+
+#ifndef __ASM__
+
+#include <lunaix/types.h>
+
+static inline bool
+check_bootstack_sanity()
+{
+    extern unsigned int __kinit_stack_end[];
+
+    return ( __kinit_stack_end[0] 
+           | __kinit_stack_end[1]
+           | __kinit_stack_end[2]
+           | __kinit_stack_end[3]) == STACK_SANITY;
+}
+
+static inline void must_inline noret
+failsafe_diagnostic() {
+    // asm ("jmp __fatal_state");
+    extern int failsafe_stack_top[];
+    asm (
+        "movl %%esp, %%eax\n"
+        "movl %%ebp, %%ebx\n"
+
+        "movl %0, %%esp\n"
+
+        "pushl %%eax\n"
+        "pushl %%ebx\n"
+        
+        "call do_failsafe_unrecoverable\n"
+        ::"r"(failsafe_stack_top) 
+        :"memory"
+    );
+    unreachable;
+}
+
+#endif
+
+#endif /* __LUNAIX_FAILSAFE_H */