feat: add kernel ACPI support for querying battery percentage, add battery indicator to desktop, move log state to 0:/state directory

kernel/src/Common/Panic.cpp

@@ -42,10 +42,21 @@ static void PrintGPFInfo(System::PanicFrame*& frame) {
     PrintBoxedDec(kerr, "Error Code", gpf->GeneralProtectionFaultError, BoxWidth);
 }
 
+// Link-time base of the kernel image (see linker-x86_64.ld).
+static constexpr uint64_t KernelBaseVirt = 0xFFFFFFFF80000000ULL;
+
 static void PrintRegisters(System::PanicFrame* frame) {
     PrintBoxedSeparator(kerr, BoxWidth);
     PrintBoxedLine(kerr, "Registers:", BoxWidth, true);
     PrintBoxedHex(kerr, "Instruction Pointer", frame->IP,    BoxWidth);
+
+    // The absolute address means nothing without the link map. Its offset from
+    // the kernel's load base is what `nm bin-x86_64/kernel` can be searched
+    // for directly, so print that next to it.
+    if (frame->IP >= KernelBaseVirt)
+        PrintBoxedHex(kerr, "  kernel+", frame->IP - KernelBaseVirt, BoxWidth);
+
+
     PrintBoxedHex(kerr, "Code Segment",        frame->CS,    BoxWidth);
     PrintBoxedHex(kerr, "Flags",               frame->Flags, BoxWidth);
     PrintBoxedHex(kerr, "Stack Pointer",       frame->SP,    BoxWidth);