MOVL	$-1, ret_hi+8(FP)
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$8-12
	CALL	runtime·nanotime1(SB)
	MOVL	0(SP), AX
	MOVL	4(SP), DX

	MOVL	$1000000000, CX
	DIVL	CX
	MOVL	AX, sec_lo+0(FP)
	MOVL	$0, sec_hi+4(FP)
	MOVL	DX, nsec+8(FP)
	RET

TEXT runtime·notify(SB),NOSPLIT,$0
	MOVL	$28, AX
	INT	$64
	MOVL	AX, ret+4(FP)
	RET

	assert.Equal(t, uint64(0), getCPUWeight(nil))

	v := uint64(2)
	assert.Equal(t, uint64(1), getCPUWeight(&v))

	v = uint64(262144)
	assert.Equal(t, uint64(10000), getCPUWeight(&v))

	v = uint64(1000000000)
	assert.Equal(t, uint64(10000), getCPUWeight(&v))
}

func TestSoftRequirementsValidationSuccess(t *testing.T) {
	if cgroups.IsCgroup2UnifiedMode() {
		t.Skip("skipping cgroup v1 test on a cgroup v2 system")

	// unscale by discarding low 32 bits, shifting the rest by 29
	MOVW	R6>>29,R6		// R6:R7 = (R5:R6:R7 >> 61)
	ORR	R7<<3,R6
	MOVW	R7>>29,R7

	// subtract (10**9 * sec) from nsec to get nanosecond remainder
	MOVW	$1000000000, R5		// 10**9
	MULLU	R6,R5,(R9,R8)		// R8:R9 = R6:R7 * R5
	MULA	R7,R5,R9,R9
	SUB.S	R8,R1			// R1:R2 -= R8:R9
	SBC	R9,R2

	// because reciprocal was a truncated repeating fraction, quotient

	_CLOCK_MONOTONIC = 10
)

//go:nosplit
func nanotime1() int64 {
	tp := &timespec{}
	if clock_gettime(_CLOCK_REALTIME, tp) != 0 {
		throw("syscall clock_gettime failed")
	}
	return tp.tv_sec*1000000000 + tp.tv_nsec
}

func walltime() (sec int64, nsec int32) {
	ts := &timespec{}
	if clock_gettime(_CLOCK_REALTIME, ts) != 0 {
		throw("syscall clock_gettime failed")
	}
	return ts.tv_sec, int32(ts.tv_nsec)

	dir, err := os.MkdirTemp("", "cachetest-")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)

	c, err := Open(dir)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	const start = 1000000000
	now := int64(start)
	c.now = func() time.Time { return time.Unix(now, 0) }

	checkTime := func(name string, mtime int64) {
		t.Helper()
		file := filepath.Join(c.dir, name[:2], name)

	LEAL	12(SP), BX
	MOVL	$CLOCK_MONOTONIC, 4(SP)
	MOVL	BX, 8(SP)
	INT	$0x80
	MOVL	12(SP), AX	// sec
	MOVL	16(SP), BX	// nsec

	// sec is in AX, nsec in BX
	// convert to DX:AX nsec
	MOVL	$1000000000, CX
	MULL	CX
	ADDL	BX, AX
	ADCL	$0, DX

	MOVL	AX, ret_lo+0(FP)
	MOVL	DX, ret_hi+4(FP)
	RET


TEXT runtime·asmSigaction(SB),NOSPLIT,$-4
	MOVL	$SYS_sigaction, AX
	INT	$0x80

	MOVL	$232, AX
	MOVQ	$4, DI  	// CLOCK_MONOTONIC
	LEAQ	8(SP), SI
	SYSCALL
	MOVQ	8(SP), AX	// sec
	MOVQ	16(SP), DX	// nsec

	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET

TEXT runtime·sigaction(SB),NOSPLIT,$-8
	MOVL	sig+0(FP), DI		// arg 1 sig
	MOVQ	new+8(FP), SI		// arg 2 act
	MOVQ	old+16(FP), DX		// arg 3 oact

	MOVD	$CLOCK_MONOTONIC, R0
	MOVD	$8(RSP), R1
	MOVD	$SYS_clock_gettime, R8
	SVC
	MOVD	8(RSP), R0	// sec
	MOVW	16(RSP), R2	// nsec

	// sec is in R0, nsec in R2
	// return nsec in R2
	MOVD	$1000000000, R3
	MUL	R3, R0
	ADD	R2, R0

	MOVD	R0, ret+0(FP)
	RET

// func asmSigaction(sig uintptr, new, old *sigactiont) int32
TEXT runtime·asmSigaction(SB),NOSPLIT|NOFRAME,$0

	MOVD	$8(RSP), R1		// arg 2 - tp
	SVC	$SYS___clock_gettime50
	MOVD	8(RSP), R0		// sec
	MOVD	16(RSP), R2		// nsec

	// sec is in R0, nsec in R2
	// return nsec in R2
	MOVD	$1000000000, R3
	MUL	R3, R0
	ADD	R2, R0

	MOVD	R0, ret+0(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT,$-8
	MOVD	ctxt+0(FP), R0		// arg 1 - context
	SVC	$SYS_getcontext
	BCS	fail
	RET
fail:

	MOVW	CLOCK_MONOTONIC, R4	// arg 1 - clock_id
	MOVV	$8(R29), R5		// arg 2 - tp
	MOVV	$87, R2			// sys_clock_gettime
	SYSCALL

	MOVV	8(R29), R3		// sec
	MOVV	16(R29), R5		// nsec

	MOVV	$1000000000, R4
	MULVU	R4, R3
	MOVV	LO, R3
	ADDVU	R5, R3
	MOVV	R3, ret+0(FP)
	RET

TEXT runtime·sigaction(SB),NOSPLIT,$0
	MOVW	sig+0(FP), R4		// arg 1 - signum
	MOVV	new+8(FP), R5		// arg 2 - new sigaction