Add UEF as a target

GNUmakefile

@@ -924,6 +924,10 @@ ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/main
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm-unknown       examples/hello-wasm-unknown
 endif
+	$(TINYGO) build -size short -o test.exe -target=uefi-amd64          examples/empty
+	@$(MD5SUM) test.exe
+	$(TINYGO) build -size short -o test.exe -target=uefi-amd64          examples/time-offset
+	@$(MD5SUM) test.exe
 	# test various compiler flags
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -gc=none -scheduler=none examples/blinky1
 	@$(MD5SUM) test.hex
@@ -943,6 +947,7 @@ endif
 	GOOS=windows GOARCH=arm64 $(TINYGO) build -size short -o test.exe   ./testdata/cgo
 	GOOS=darwin GOARCH=amd64 $(TINYGO) build  -size short -o test       ./testdata/cgo
 	GOOS=darwin GOARCH=arm64 $(TINYGO) build  -size short -o test       ./testdata/cgo
+	$(TINYGO) build -size short -o test.exe -target=uefi-amd64          ./testdata/cgo
 ifneq ($(OS),Windows_NT)
 	# TODO: this does not yet work on Windows. Somehow, unused functions are
 	# not garbage collected.

builder/build.go

@@ -807,8 +807,15 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				ldflags = append(ldflags, dependency.result)
 			}
 			ldflags = append(ldflags, "-mllvm", "-mcpu="+config.CPU())
+			buildTags := config.BuildTags()
+			isWindowsLinker := config.GOOS() == "windows"
+			for _, tag := range buildTags {
+				if tag == "uefi" {
+					isWindowsLinker = true
+				}
+			}
 			ldflags = append(ldflags, "-mllvm", "-mattr="+config.Features()) // needed for MIPS softfloat
-			if config.GOOS() == "windows" {
+			if isWindowsLinker {
 				// Options for the MinGW wrapper for the lld COFF linker.
 				ldflags = append(ldflags,
 					"-Xlink=/opt:lldlto="+strconv.Itoa(speedLevel),

builder/builder_test.go

@@ -34,6 +34,7 @@ func TestClangAttributes(t *testing.T) {
 		"nintendoswitch",
 		"riscv-qemu",
 		"tkey",
+		"uefi-amd64",
 		"wasip1",
 		"wasip2",
 		"wasm",

src/device/x86/cpu.go

@@ -0,0 +1,141 @@
+//go:build amd64
+
+package x86
+
+const (
+	// CPUID_TIME_STAMP_COUNTER
+	// EAX  Returns processor base frequency information described by the
+	//      type CPUID_PROCESSOR_FREQUENCY_EAX.
+	// EBX  Returns maximum frequency information described by the type
+	//      CPUID_PROCESSOR_FREQUENCY_EBX.
+	// ECX  Returns bus frequency information described by the type
+	//      CPUID_PROCESSOR_FREQUENCY_ECX.
+	// EDX  Reserved.
+	CPUID_TIME_STAMP_COUNTER = 0x15
+
+	// CPUID_PROCESSOR_FREQUENCY
+	// EAX  Returns processor base frequency information described by the
+	//      type CPUID_PROCESSOR_FREQUENCY_EAX.
+	// EBX  Returns maximum frequency information described by the type
+	//      CPUID_PROCESSOR_FREQUENCY_EBX.
+	// ECX  Returns bus frequency information described by the type
+	//      CPUID_PROCESSOR_FREQUENCY_ECX.
+	// EDX  Reserved.
+	CPUID_PROCESSOR_FREQUENCY = 0x16
+)
+
+type CpuExtendedFamily uint16
+
+const (
+	// AMD
+	CPU_FAMILY_AMD_11H CpuExtendedFamily = 0x11
+	// Intel
+	CPU_FAMILY_INTEL_CORE    CpuExtendedFamily = 6
+	CPU_MODEL_NEHALEM        CpuExtendedFamily = 0x1e
+	CPU_MODEL_NEHALEM_EP     CpuExtendedFamily = 0x1a
+	CPU_MODEL_NEHALEM_EX     CpuExtendedFamily = 0x2e
+	CPU_MODEL_WESTMERE       CpuExtendedFamily = 0x25
+	CPU_MODEL_WESTMERE_EP    CpuExtendedFamily = 0x2c
+	CPU_MODEL_WESTMERE_EX    CpuExtendedFamily = 0x2f
+	CPU_MODEL_SANDYBRIDGE    CpuExtendedFamily = 0x2a
+	CPU_MODEL_SANDYBRIDGE_EP CpuExtendedFamily = 0x2d
+	CPU_MODEL_IVYBRIDGE_EP   CpuExtendedFamily = 0x3a
+	CPU_MODEL_HASWELL_E3     CpuExtendedFamily = 0x3c
+	CPU_MODEL_HASWELL_E7     CpuExtendedFamily = 0x3f
+	CPU_MODEL_BROADWELL      CpuExtendedFamily = 0x3d
+)
+
+func GetExtendedCpuFamily() CpuExtendedFamily {
+	var family CpuExtendedFamily
+	family = CpuExtendedFamily((stdCpuid1Eax >> 8) & 0x0f)
+	family += CpuExtendedFamily((stdCpuid1Eax >> 20) & 0xff)
+	return family
+}
+
+//export asmPause
+func AsmPause()
+
+//export asmReadRdtsc
+func AsmReadRdtsc() uint64
+
+//export asmCpuid
+func AsmCpuid(index uint32, registerEax *uint32, registerEbx *uint32, registerEcx *uint32, registerEdx *uint32) int
+
+var maxCpuidIndex uint32
+var stdVendorName0 uint32
+var stdCpuid1Eax uint32
+var stdCpuid1Ebx uint32
+var stdCpuid1Ecx uint32
+var stdCpuid1Edx uint32
+
+func init() {
+	AsmCpuid(0, &maxCpuidIndex, &stdVendorName0, nil, nil)
+	AsmCpuid(1, &stdCpuid1Eax, &stdCpuid1Ebx, &stdCpuid1Ecx, &stdCpuid1Edx)
+}
+
+func GetMaxCpuidIndex() uint32 {
+	return maxCpuidIndex
+}
+
+func IsIntel() bool {
+	return stdVendorName0 == 0x756e6547
+}
+
+func IsIntelFamilyCore() bool {
+	return IsIntel() && GetExtendedCpuFamily() == CPU_FAMILY_INTEL_CORE
+}
+
+func IsAmd() bool {
+	return stdVendorName0 == 0x68747541
+}
+
+func InternalGetPerformanceCounterFrequency() uint64 {
+	if maxCpuidIndex >= CPUID_TIME_STAMP_COUNTER {
+		return CpuidCoreClockCalculateTscFrequency()
+	}
+
+	return 0
+}
+
+func CpuidCoreClockCalculateTscFrequency() uint64 {
+	var TscFrequency uint64
+	var CoreXtalFrequency uint64
+	var RegEax uint32
+	var RegEbx uint32
+	var RegEcx uint32
+
+	AsmCpuid(CPUID_TIME_STAMP_COUNTER, &RegEax, &RegEbx, &RegEcx, nil)
+
+	// If EAX or EBX returns 0, the XTAL ratio is not enumerated.
+	if (RegEax == 0) || (RegEbx == 0) {
+		return 0
+	}
+
+	// If ECX returns 0, the XTAL frequency is not enumerated.
+	// And PcdCpuCoreCrystalClockFrequency defined should base on processor series.
+	//
+	if RegEcx == 0 {
+		// Specifies CPUID Leaf 0x15 Time Stamp Counter and Nominal Core Crystal Clock Frequency.
+		// https://github.com/torvalds/linux/blob/master/tools/power/x86/turbostat/turbostat.c
+		if IsIntelFamilyCore() {
+			switch GetExtendedCpuFamily() {
+			case 0x5F: // INTEL_FAM6_ATOM_GOLDMONT_D
+				CoreXtalFrequency = 25000000
+			case 0x5C: // INTEL_FAM6_ATOM_GOLDMONT
+				CoreXtalFrequency = 19200000
+			case 0x7A: // INTEL_FAM6_ATOM_GOLDMONT_PLUS
+				CoreXtalFrequency = 19200000
+			default:
+				CoreXtalFrequency = 24000000
+			}
+		} else {
+			return 0
+		}
+	} else {
+		CoreXtalFrequency = uint64(RegEcx)
+	}
+
+	// Calculate TSC frequency = (ECX, Core Xtal Frequency) * EBX/EAX
+	TscFrequency = ((CoreXtalFrequency * uint64(RegEbx)) + (uint64(RegEax) / 2)) / uint64(RegEax)
+	return TscFrequency
+}

src/device/x86/cpu_amd64.S

@@ -0,0 +1,59 @@
+.section .text
+
+.global asmPause
+asmPause:
+    pause
+    ret
+
+.global asmReadRdtsc
+asmReadRdtsc:
+    rdtsc
+    shlq  $0x20, %rdx
+    orq   %rdx, %rax
+    ret
+
+// @param  Index         The 32-bit value to load into EAX prior to invoking the CPUID
+//                       instruction.
+// @param  RegisterEax   A pointer to the 32-bit EAX value returned by the CPUID
+//                       instruction. This is an optional parameter that may be NULL.
+// @param  RegisterEbx   A pointer to the 32-bit EBX value returned by the CPUID
+//                       instruction. This is an optional parameter that may be NULL.
+// @param  RegisterEcx   A pointer to the 32-bit ECX value returned by the CPUID
+//                       instruction. This is an optional parameter that may be NULL.
+// @param  RegisterEdx   A pointer to the 32-bit EDX value returned by the CPUID
+//                       instruction. This is an optional parameter that may be NULL.
+// @return Index.
+.global asmCpuid
+asmCpuid:
+    // rcx = Index
+    // rdx = RegisterEax
+    // r8  = RegisterEbx
+    // r9  = RegisterEcx
+    // rsp + 0x28 = RegisterEdx
+    pushq  %rbx
+
+    mov    %ecx, %eax // eax <- index
+    pushq  %rax       // save Index on stack
+
+    pushq  %rdx // RegisterEax
+    cpuid
+
+    test    %r9, %r9 // RegisterEcx
+    jz      .SkipEcx
+    mov     %ecx, (%r9)
+.SkipEcx:
+    popq     %rcx // RegisterEax
+    jrcxz   .SkipEax
+    mov     %eax, (%rcx)
+.SkipEax:
+    mov     %r8, %rcx // RegisterEbx
+    jrcxz   .SkipEbx
+    mov     %ebx, (%rcx)
+.SkipEbx:
+    mov     0x38(%rsp), %rcx // 0x28 + 0x10
+    jrcxz   .SkipEdx
+    mov     %edx, (%rcx)
+.SkipEdx:
+    popq     %rax // restore Index to rax as return value
+    popq     %rbx
+    ret

src/internal/task/task_none_uefi.go

@@ -0,0 +1,7 @@
+//go:build scheduler.none && uefi
+
+package task
+
+//go:export tinygo_task_exit
+func task_exit() {
+}

src/internal/task/task_stack_amd64.go

@@ -1,4 +1,4 @@
-//go:build scheduler.tasks && amd64 && !windows
+//go:build scheduler.tasks && amd64 && !windows && !uefi
 
 package task
 

src/internal/task/task_stack_amd64_windows.go → src/internal/task/task_stack_amd64_winabi.go

@@ -1,4 +1,4 @@
-//go:build scheduler.tasks && amd64 && windows
+//go:build scheduler.tasks && amd64 && (windows || uefi)
 
 package task
 

src/machine/uefi/arch_x86.go

@@ -0,0 +1,17 @@
+//go:build i386 || amd64
+
+package uefi
+
+import "device/x86"
+
+func Ticks() uint64 {
+	return x86.AsmReadRdtsc()
+}
+
+func CpuPause() {
+	x86.AsmPause()
+}
+
+func getTscFrequency() uint64 {
+	return x86.InternalGetPerformanceCounterFrequency()
+}