const (
	locked uintptr = 1

	active_spin     = 4
	active_spin_cnt = 30
	passive_spin    = 1
)

func mutexContended(l *mutex) bool {
	return atomic.Loaduintptr(&l.key) > locked
}

func lock(l *mutex) {
	lockWithRank(l, getLockRank(l))
}

func lock2(l *mutex) {
	gp := getg()
	if gp.m.locks < 0 {
		throw("runtime·lock: lock count")
	}
	gp.m.locks++

//go:nosplit
func (th *vdsoTimehands) getHPETTimecounter() (uint32, bool) {
	idx := int(th.x86_hpet_idx)
	if idx >= len(hpetDevMap) {
		return 0, false
	}

	p := atomic.Loaduintptr(&hpetDevMap[idx])
	if p == 0 {
		systemstack(func() { initHPETTimecounter(idx) })
		p = atomic.Loaduintptr(&hpetDevMap[idx])
	}
	if p == ^uintptr(0) {
		return 0, false
	}
	return *(*uint32)(unsafe.Pointer(p + _HPET_MAIN_COUNTER)), true
}

//go:systemstack

//go:noescape
func Storeint32(ptr *int32, new int32)

//go:noescape
func Storeint64(ptr *int64, new int64)

//go:noescape
func Storeuintptr(ptr *uintptr, new uintptr)

//go:noescape
func Loaduintptr(ptr *uintptr) uintptr

//go:noescape
func Loaduint(ptr *uint) uint

// TODO(matloob): Should these functions have the go:noescape annotation?

//go:noescape
func Loadint32(ptr *int32) int32

// Export some functions via linkname to assembly in sync/atomic.
//
//go:linkname Load
//go:linkname Loadp
//go:linkname Load64
//go:linkname Loadint32
//go:linkname Loadint64
//go:linkname Loaduintptr
//go:linkname LoadAcquintptr
//go:linkname Xadd
//go:linkname Xaddint32
//go:linkname Xaddint64
//go:linkname Xadd64
//go:linkname Xadduintptr
//go:linkname Xchg
//go:linkname Xchg64
//go:linkname Xchgint32

TEXT ·Casuintptr(SB), NOSPLIT, $0-25
	BR	·Cas64(SB)

// func CasRel(ptr *uint32, old, new uint32) bool
TEXT ·CasRel(SB), NOSPLIT, $0-17
	BR	·Cas(SB)

// func Loaduintptr(ptr *uintptr) uintptr
TEXT ·Loaduintptr(SB), NOSPLIT, $0-16
	BR	·Load64(SB)

// func Loaduint(ptr *uint) uint
TEXT ·Loaduint(SB), NOSPLIT, $0-16
	BR	·Load64(SB)

// func Storeint32(ptr *int32, new int32)

	JMP	internal∕runtime∕atomic·Load(SB)

TEXT ·LoadInt64(SB),NOSPLIT,$0
	JMP	internal∕runtime∕atomic·Load64(SB)

TEXT ·LoadUint64(SB),NOSPLIT,$0
	JMP	internal∕runtime∕atomic·Load64(SB)

TEXT ·LoadUintptr(SB),NOSPLIT,$0
	JMP	internal∕runtime∕atomic·Loaduintptr(SB)

TEXT ·LoadPointer(SB),NOSPLIT,$0
	JMP	internal∕runtime∕atomic·Loadp(SB)

TEXT ·StoreInt32(SB),NOSPLIT,$0
	JMP	internal∕runtime∕atomic·Store(SB)

TEXT ·CasRel(SB), NOSPLIT, $0-17
	JMP	·Cas(SB)

TEXT ·Loaduintptr(SB),NOSPLIT,$0-16
	JMP	·Load64(SB)

TEXT ·Storeint32(SB),NOSPLIT,$0-12
	JMP	·Store(SB)

TEXT ·Storeint64(SB),NOSPLIT,$0-16
	JMP	·Store64(SB)

TEXT ·Storeuintptr(SB),NOSPLIT,$0-16
	JMP	·Store64(SB)

TEXT ·Loaduint(SB),NOSPLIT,$0-16
	JMP ·Loaduintptr(SB)

TEXT ·Loadint32(SB),NOSPLIT,$0-12
	JMP ·Load(SB)

	l := getCachedDlogger()

	// If we couldn't get a cached logger, try to get one from the
	// global pool.
	if l == nil {
		allp := (*uintptr)(unsafe.Pointer(&allDloggers))
		all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp)))
		for l1 := all; l1 != nil; l1 = l1.allLink {
			if l1.owned.Load() == 0 && l1.owned.CompareAndSwap(0, 1) {
				l = l1
				break
			}
		}
	}

	// If that failed, allocate a new logger.

// license that can be found in the LICENSE file.

// Note: some of these functions are semantically inlined
// by the compiler (in src/cmd/compile/internal/gc/ssa.go).

#include "textflag.h"

TEXT ·Loaduintptr(SB), NOSPLIT, $0-16
	JMP	·Load64(SB)

TEXT ·Loaduint(SB), NOSPLIT, $0-16
	JMP	·Load64(SB)

TEXT ·Loadint32(SB), NOSPLIT, $0-12
	JMP	·Load(SB)

TEXT ·Loadint64(SB), NOSPLIT, $0-16
	JMP	·Load64(SB)

// (particularly if you target 32-bit platforms; see the bugs section).
func LoadUint64(addr *uint64) (val uint64)

// LoadUintptr atomically loads *addr.
// Consider using the more ergonomic and less error-prone [Uintptr.Load] instead.
func LoadUintptr(addr *uintptr) (val uintptr)

// LoadPointer atomically loads *addr.
// Consider using the more ergonomic and less error-prone [Pointer.Load] instead.