tinygo-org · sparques · Jun 15, 2026
diff --git a/src/device/amd64/cpu.go b/src/device/amd64/cpu.go
@@ -0,0 +1,74 @@
+//go:build amd64
+
+package amd64
+
+const (
+	CPUIDTimeStampCounter   = 0x15
+	CPUIDProcessorFrequency = 0x16
+)
+
+type CPUExtendedFamily uint16
+
+const (
+	CPUFamilyIntelCore CPUExtendedFamily = 6
+)
+
+//export asmPause
+func AsmPause()
+
+//export asmReadRdtsc
+func AsmReadRdtsc() uint64
+
+//export asmCpuid
+func AsmCpuid(index uint32, registerEax *uint32, registerEbx *uint32, registerEcx *uint32) int
+
+var maxCpuidIndex uint32
+var stdVendorName0 uint32
+var stdCpuid1Eax uint32
+
+func init() {
+	AsmCpuid(0, &maxCpuidIndex, &stdVendorName0, nil)
+	AsmCpuid(1, &stdCpuid1Eax, nil, nil)
+}
+
+func getExtendedCPUFamily() CPUExtendedFamily {
+	family := CPUExtendedFamily((stdCpuid1Eax >> 8) & 0x0f)
+	family += CPUExtendedFamily((stdCpuid1Eax >> 20) & 0xff)
+	return family
+}
+
+func isIntel() bool {
+	return stdVendorName0 == 0x756e6547
+}
+
+func isIntelFamilyCore() bool {
+	return isIntel() && getExtendedCPUFamily() == CPUFamilyIntelCore
+}
+
+func InternalGetPerformanceCounterFrequency() uint64 {
+	if maxCpuidIndex >= CPUIDTimeStampCounter {
+		return cpuidCoreClockCalculateTSCFrequency()
+	}
+	return 0
+}
+
+func cpuidCoreClockCalculateTSCFrequency() uint64 {
+	var eax uint32
+	var ebx uint32
+	var ecx uint32
+
+	AsmCpuid(CPUIDTimeStampCounter, &eax, &ebx, &ecx)
+	if eax == 0 || ebx == 0 {
+		return 0
+	}
+
+	coreCrystalFrequency := uint64(ecx)
+	if coreCrystalFrequency == 0 {
+		if !isIntelFamilyCore() {
+			return 0
+		}
+		coreCrystalFrequency = 24000000
+	}
+
+	return ((coreCrystalFrequency * uint64(ebx)) + (uint64(eax) / 2)) / uint64(eax)
+}
diff --git a/src/device/amd64/cpu_amd64.S b/src/device/amd64/cpu_amd64.S
@@ -0,0 +1,39 @@
+.section .text
+
+.global asmPause
+asmPause:
+    pause
+    ret
+
+.global asmReadRdtsc
+asmReadRdtsc:
+    rdtsc
+    shlq  $0x20, %rdx
+    orq   %rdx, %rax
+    ret
+
+.global asmCpuid
+asmCpuid:
+    pushq  %rbx
+
+    mov    %ecx, %eax
+    pushq  %rax
+
+    pushq  %rdx
+    cpuid
+
+    test   %r9, %r9
+    jz     .SkipEcx
+    mov    %ecx, (%r9)
+.SkipEcx:
+    popq   %rcx
+    jrcxz  .SkipEax
+    mov    %eax, (%rcx)
+.SkipEax:
+    mov    %r8, %rcx
+    jrcxz  .SkipEbx
+    mov    %ebx, (%rcx)
+.SkipEbx:
+    popq   %rax
+    popq   %rbx
+    ret
diff --git a/src/device/uefi/arch_x86.go b/src/device/uefi/arch_x86.go
@@ -0,0 +1,17 @@
+//go:build i386 || amd64
+
+package uefi
+
+import "device/amd64"
+
+func Ticks() uint64 {
+	return amd64.AsmReadRdtsc()
+}
+
+func CpuPause() {
+	amd64.AsmPause()
+}
+
+func getTSCFrequency() uint64 {
+	return amd64.InternalGetPerformanceCounterFrequency()
+}
diff --git a/src/device/uefi/asm_amd64.S b/src/device/uefi/asm_amd64.S
@@ -0,0 +1,201 @@
+.section .text
+
+.global uefiCall0
+uefiCall0:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x20, %rsp
+    callq  *%rcx
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall1
+uefiCall1:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x20, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall2
+uefiCall2:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x20, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall3
+uefiCall3:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x20, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall4
+uefiCall4:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x20, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall5
+uefiCall5:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x30, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall6
+uefiCall6:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x30, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    movq   0x40(%rbp), %r10
+    movq   %r10, 0x28(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall7
+uefiCall7:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x40, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    movq   0x40(%rbp), %r10
+    movq   %r10, 0x28(%rsp)
+    movq   0x48(%rbp), %r10
+    movq   %r10, 0x30(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall8
+uefiCall8:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x40, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    movq   0x40(%rbp), %r10
+    movq   %r10, 0x28(%rsp)
+    movq   0x48(%rbp), %r10
+    movq   %r10, 0x30(%rsp)
+    movq   0x50(%rbp), %r10
+    movq   %r10, 0x38(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall9
+uefiCall9:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x50, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    movq   0x40(%rbp), %r10
+    movq   %r10, 0x28(%rsp)
+    movq   0x48(%rbp), %r10
+    movq   %r10, 0x30(%rsp)
+    movq   0x50(%rbp), %r10
+    movq   %r10, 0x38(%rsp)
+    movq   0x58(%rbp), %r10
+    movq   %r10, 0x40(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global uefiCall10
+uefiCall10:
+    pushq  %rbp
+    movq   %rsp, %rbp
+    subq   $0x50, %rsp
+    movq   %rcx, %rax
+    movq   %rdx, %rcx
+    movq   %r8,  %rdx
+    movq   %r9,  %r8
+    movq   0x30(%rbp), %r9
+    movq   0x38(%rbp), %r10
+    movq   %r10, 0x20(%rsp)
+    movq   0x40(%rbp), %r10
+    movq   %r10, 0x28(%rsp)
+    movq   0x48(%rbp), %r10
+    movq   %r10, 0x30(%rsp)
+    movq   0x50(%rbp), %r10
+    movq   %r10, 0x38(%rsp)
+    movq   0x58(%rbp), %r10
+    movq   %r10, 0x40(%rsp)
+    movq   0x60(%rbp), %r10
+    movq   %r10, 0x48(%rsp)
+    callq  *%rax
+    movq   %rbp, %rsp
+    popq   %rbp
+    ret
+
+.global ___chkstk_ms
+___chkstk_ms:
+    ret
diff --git a/src/device/uefi/call.go b/src/device/uefi/call.go
@@ -0,0 +1,45 @@
+package uefi
+
+//go:nosplit
+//export uefiCall0
+func UefiCall0(fn uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall1
+func UefiCall1(fn uintptr, a uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall2
+func UefiCall2(fn uintptr, a uintptr, b uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall3
+func UefiCall3(fn uintptr, a uintptr, b uintptr, c uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall4
+func UefiCall4(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall5
+func UefiCall5(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall6
+func UefiCall6(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr, f uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall7
+func UefiCall7(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr, f uintptr, g uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall8
+func UefiCall8(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr, f uintptr, g uintptr, h uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall9
+func UefiCall9(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr, f uintptr, g uintptr, h uintptr, i uintptr) EFI_STATUS
+
+//go:nosplit
+//go:export uefiCall10
+func UefiCall10(fn uintptr, a uintptr, b uintptr, c uintptr, d uintptr, e uintptr, f uintptr, g uintptr, h uintptr, i uintptr, j uintptr) EFI_STATUS