1 files changed, 418 insertions, 0 deletions
diff --git a/src/shared/mod.rs b/src/shared/mod.rs
new file mode 100644
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--- /dev/null
+++ b/src/shared/mod.rs
@@ -0,0 +1,418 @@
+//! Data structures and functions used by both protected mode and IA-32e.
+
+// In a few rare-cases this module includes mode-specific
+// *implementations*. This is usually because we cannot trust the LLVM inline
+// assembler to infer instruction variants from argument size, and thus we add
+// size-suffixes wherever possible.
+//
+// That said, *interfaces* must always be mode-portable
+
+#![allow(non_upper_case_globals)]
+
+bitflags! {
+	pub flags Flags: usize {
+		const CarryFlag = 1 << 0,
+		const ParityFlag = 1 << 2,
+		const AdjustFlag = 1 << 4,
+		const ZeroFlag = 1 << 6,
+		const SignFlag = 1 << 7,
+		const TrapFlag = 1 << 8,
+		const InterruptFlag = 1 << 9,
+		const DirectionFlag = 1 << 10,
+		const OverflowFlag = 1 << 11,
+		const Iopl1 = 1 << 12,
+		const Iopl2 = 1 << 13,
+		const NestedTaskFlag = 1 << 14,
+		const ResumeFlag = 1 << 16,
+		const Virtual8086Flag = 1 << 17,
+		const AlignmentFlag = 1 << 18,
+		const VirtualInterruptFlag = 1 << 19,
+		const VirtualInterruptPending = 1 << 20,
+		const CpuIdFlag = 1 << 21
+	}
+}
+
+bitflags! {
+	pub flags Cr0: usize {
+		const ProtectedMode = 1 << 0,
+		const MonitorCoprocessor = 1 << 1,
+		const EmulateCoprocessor = 1 << 2,
+		const TaskSwitched = 1 << 3,
+		const ExtensionType = 1 << 4,
+		const NumericError = 1 << 5,
+		const WriteProtect = 1 << 16,
+		const AlignmentMask = 1 << 18,
+		const NotWriteThrough = 1 << 29,
+		const CacheDisable = 1 << 30,
+		const EnablePaging = 1 << 31
+	}
+}
+
+bitflags! {
+	pub flags Cr4: usize {
+		const EnableVme = 1 << 0,
+		const VirtualInterrupts = 1 << 1,
+		const TimeStampDisable = 1 << 2,
+		const DebuggingExtensions = 1 << 3,
+		const EnablePse = 1 << 4,
+		const EnablePae = 1 << 5,
+		const EnableMachineCheck = 1 << 6,
+		const EnableGlobalPages = 1 << 7,
+		const EnablePpmc = 1 << 8,
+		const EnableSse = 1 << 9,
+		const UnmaskedSse = 1 << 10,
+		const EnableVmx = 1 << 13,
+		const EnableSmx = 1 << 14,
+		const EnablePcid = 1 << 17,
+		const EnableOsXSave = 1 << 18,
+		const EnableSmep = 1 << 20,
+		const EnableSmap = 1 << 21
+	}
+}
+
+bitflags!(
+	pub flags Features: u64 {
+		const Fpu = 1 << 0,
+		const Virtual8086 = 1 << 1,
+		const DebugExtension = 1 << 2,
+		const PageSizeExtension = 1 << 3,
+		const TimeStampCounter = 1 << 4,
+		const ModelSpecificRegister = 1 << 5,
+		const PhysicalAddressExtension = 1 << 6,
+		const MachineCheckException = 1 << 7,
+		const Cx8 = 1 << 8, // CMPXCHG8
+		const Apic = 1 << 9,
+		const SysEnter = 1 << 11,
+		const MemoryTypeRange = 1 << 12,
+		const PageGlobal = 1 << 13,
+		const MachineCheckArchitecture = 1 << 14,
+		const CMov = 1 << 15,
+		const PageAttributeTable = 1 << 16,
+		const PageSizeExtension36 = 1 << 17,
+		const ProcessorSerial = 1 << 18,
+		const CacheFlush = 1 << 19,
+		const DebugStore = 1 << 21,
+		const Acpi = 1 << 22,
+		const Mmx = 1 << 23,
+		const FxSave = 1 << 24,
+		const Sse = 1 << 25,
+		const Sse2 = 1 << 26,
+		const SelfSnoop = 1 << 27,
+		const HyperThreading = 1 << 28,
+		const ThermalMonitor = 1 << 29,
+		const Ia64 = 1 << 30,
+		const PendingBreak = 1 << 31,
+
+		const Sse3 = 1 << (32 + 0),
+		const PclMulQdq = 1 << (32 + 1), // what
+		const DebugStore64 = 1 << (32 + 2),
+		const Monitor = 1 << (32 + 3),
+		const CplDebugStore = 1 << (32 + 4),
+		const Vmx = 1 << (32 + 5),
+		const SaferMode = 1 << (32 + 6),
+		const EnhancedSpeedStep = 1 << (32 + 7),
+		const ThermalMonitor2 = 1 << (32 + 8),
+		const Ssse3 = 1 << (32 + 9),
+		const L1ContextId = 1 << (32 + 10),
+		const Fma = 1 << (32 + 12),
+		const Cx16 = 1 << (32 + 13), // CMPXCHG16B
+		const Xtpr = 1 << (32 + 14), // I have no idea what this is
+		const PerformanceMonitor = 1 << (32 + 15),
+		const ProcessContextId = 1 << (32 + 17),
+		const DirectCache = 1 << (32 + 18),
+		const Sse41 = 1 << (32 + 19),
+		const Sse42 = 1 << (32 + 20),
+		const X2Apic = 1 << (32 + 21),
+		const MovBe = 1 << (32 + 22),
+		const PopulationCount = 1 << (32 + 23),
+		const TscDeadline = 1 << (32 + 24),
+		const AesNi = 1 << (32 + 25),
+		const XSave = 1 << (32 + 26),
+		const OsXSave = 1 << (32 + 27),
+		const Avx = 1 << (32 + 28),
+		const HalfPrecision = 1 << (32 + 29),
+		const HwRandom = 1 << (32 + 30)
+	}
+);
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum Exception {
+	DivisionByZero = 0,
+	Debug = 1,
+	Nmi = 2,
+	Breakpoint = 3,
+	Overflow = 4,
+	Bounds = 5,
+	InvalidOpcode = 6,
+	NotAvailable = 7,
+	DoubleFault = 8,
+	CoprocessorSegment = 9,
+	Tss = 10,
+	NotPresent = 11,
+	StackSegment = 12,
+	GeneralProtection = 13,
+	PageFault = 14,
+	Fpu = 16,
+	Alignment = 17,
+	MachineCheck = 18,
+	Simd = 19,
+	Virtualization = 20,
+	Security = 30
+}
+
+impl Exception {
+	pub fn from_code(code: u32) -> Option<Exception> {
+		Some(match code {
+			0 => Exception::DivisionByZero,
+			1 => Exception::Debug,
+			2 => Exception::Nmi,
+			3 => Exception::Breakpoint,
+			4 => Exception::Overflow,
+			5 => Exception::Bounds,
+			6 => Exception::InvalidOpcode,
+			7 => Exception::NotAvailable,
+			8 => Exception::DoubleFault,
+			9 => Exception::CoprocessorSegment,
+			10 => Exception::Tss,
+			11 => Exception::NotPresent,
+			12 => Exception::StackSegment,
+			13 => Exception::GeneralProtection,
+			14 => Exception::PageFault,
+			16 => Exception::Fpu,
+			17 => Exception::Alignment,
+			18 => Exception::MachineCheck,
+			19 => Exception::Simd,
+			20 => Exception::Virtualization,
+			30 => Exception::Security,
+			
+			_ => return None
+		})
+	}
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum Msr {
+	ApicBase = 0x1B
+}
+
+#[inline(always)]
+pub fn cpuid(function: u32) -> (u32, u32, u32, u32) {
+	unsafe {
+		let (eax, ebx, ecx, edx): (u32, u32, u32, u32);
+		asm!("cpuid" : "={eax}"(eax), "={ebx}"(ebx), "={ecx}"(ecx), "={edx}"(edx) : "{eax}"(function));
+		(eax, ebx, ecx, edx)
+	}
+}
+
+#[inline(always)]
+pub fn supports() -> Features {
+	let (_, _, feature_ecx, feature_edx) = cpuid(1);
+	Features {
+		bits: ((feature_ecx as u64) << 32) | (feature_edx as u64)
+	}
+}
+
+#[inline(always)]
+pub unsafe fn read_msr(msr: Msr) -> u64 {
+	let (r1, r2): (u32, u32);
+	asm!("rdmsr" : "={eax}"(r1), "={edx}"(r2) : "{ecx}"(msr as u32) :: "intel");
+	r1 as u64 | ((r2 as u64) << 32)
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum PrivilegeLevel {
+	Ring0 = 0,
+	Ring1 = 1,
+	Ring2 = 2,
+	Ring3 = 3,
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+#[repr(C, packed)]
+pub struct SegmentSelector {
+	data: u16
+}
+
+impl SegmentSelector {
+	#[inline(always)]
+	pub fn new(index: u16, rpl: PrivilegeLevel) -> SegmentSelector {
+		SegmentSelector {
+			data: index << 3 | rpl as u16
+		}
+	}
+
+	pub fn bits(&self) -> u16 {
+		self.data
+	}
+}
+
+#[inline(always)]
+pub unsafe fn set_tr(selector: SegmentSelector) {
+	asm!("ltr $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_ss(selector: SegmentSelector) {
+	asm!("mov ss, $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_ds(selector: SegmentSelector) {
+	asm!("mov ds, $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_es(selector: SegmentSelector) {
+	asm!("mov es, $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_gs(selector: SegmentSelector) {
+	asm!("mov gs, $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_fs(selector: SegmentSelector) {
+	asm!("mov fs, $0" :: "r"(selector.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_cs(selector: SegmentSelector) {
+	asm!("push $0;
+		push $$1f
+		lret;
+		1:" :: "ri"(selector.bits() as usize) :: "volatile");
+}
+
+#[inline(always)]
+pub fn get_cr0() -> Cr0 {
+	unsafe {
+		let r: usize;
+		asm!("mov $0, cr0" : "=r"(r) ::: "intel");
+		Cr0::from_bits_truncate(r)
+	}
+}
+
+#[inline(always)]
+pub fn get_cr2() -> usize {
+	unsafe {
+		let r: usize;
+		asm!("mov $0, cr2" : "=r"(r) ::: "intel");
+		r
+	}
+}
+
+#[inline(always)]
+pub fn get_cr3() -> usize {
+	unsafe {
+		let r: usize;
+		asm!("mov $0, cr3" : "=r"(r) ::: "intel");
+		r
+	}
+}
+
+#[inline(always)]
+pub fn get_cr4() -> Cr4 {
+	unsafe {
+		let r: usize;
+		asm!("mov $0, cr4" : "=r"(r) ::: "intel");
+		Cr4::from_bits_truncate(r)
+	}
+}
+
+#[inline(always)]
+pub unsafe fn set_cr0(flags: Cr0) {
+	asm!("mov cr0, $0" :: "r"(flags.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_cr3(val: usize) {
+	asm!("mov cr3, $0" :: "r"(val) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn set_cr4(flags: Cr4) {
+	asm!("mov cr4, $0" :: "r"(flags.bits()) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn enable_interrupts() {
+	asm!("sti" :::: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn disable_interrupts() {
+	asm!("cli" :::: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn halt() {
+	asm!("hlt" :::: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn out8(port: u16, value: u8) {
+	asm!("out $0, $1" :: "{dx}"(port), "{al}"(value) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn out16(port: u16, value: u16) {
+	asm!("out $0, $1" :: "{dx}"(port), "{ax}"(value) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn out32(port: u16, value: u32) {
+	asm!("out $0, $1" :: "{dx}"(port), "{eax}"(value) :: "volatile", "intel");
+}
+
+#[inline(always)]
+pub unsafe fn outs8(port: u16, buf: &[u8]) {
+	asm!("rep outsb dx, [esi]" :: "{ecx}"(buf.len()), "{dx}"(port), "{esi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}
+
+#[inline(always)]
+pub unsafe fn outs16(port: u16, buf: &[u16]) {
+	asm!("rep outsw dx, [esi]" :: "{ecx}"(buf.len()), "{dx}"(port), "{esi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}
+
+#[inline(always)]
+pub unsafe fn outs32(port: u16, buf: &[u32]) {
+	asm!("rep outsd dx, [esi]" :: "{ecx}"(buf.len()), "{dx}"(port), "{esi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}
+
+
+#[inline(always)]
+pub unsafe fn in8(port: u16) -> u8 {
+	let r: u8;
+	asm!("in $0, $1" : "={al}"(r) : "{dx}"(port) :: "intel");
+	r
+}
+
+#[inline(always)]
+pub unsafe fn in16(port: u16) -> u16 {
+	let r: u16;
+	asm!("in $0, $1" : "={ax}"(r) : "{dx}"(port) :: "intel");
+	r
+}
+
+#[inline(always)]
+pub unsafe fn in32(port: u16) -> u32 {
+	let r: u32;
+	asm!("in $0, $1" : "={eax}"(r) : "{dx}"(port) :: "intel");
+	r
+}
+
+#[inline(always)]
+pub unsafe fn ins8(port: u16, buf: &mut [u8]) {
+	asm!("rep insb [edi], dx" :: "{ecx}"(buf.len()), "{dx}"(port), "{edi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}
+
+#[inline(always)]
+pub unsafe fn ins16(port: u16, buf: &mut [u16]) {
+	asm!("rep insw [edi], dx" :: "{ecx}"(buf.len()), "{dx}"(port), "{edi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}
+
+#[inline(always)]
+pub unsafe fn ins32(port: u16, buf: &mut [u32]) {
+	asm!("rep insd [edi], dx" :: "{ecx}"(buf.len()), "{dx}"(port), "{edi}"(buf.as_ptr()) : "ecx", "edi" : "intel");
+}