diff --git a/Makefile b/Makefile
index 69373e419..74ba1c5e8 100644
--- a/Makefile
+++ b/Makefile
@@ -116,6 +116,7 @@ G_C_FILES := \
 	src/lib/lib_3e3e0.c \
 	src/lib/lib_45ed0.c \
 	src/lib/lib_47d20.c \
+	src/lib/lib_47ef0.c \
 	src/lib/mp3.c \
 	src/lib/speaker.c
 
diff --git a/src/lib/lib_47ef0.c b/src/lib/lib_47ef0.c
index 048fc052b..cba667d87 100644
--- a/src/lib/lib_47ef0.c
+++ b/src/lib/lib_47ef0.c
@@ -4,160 +4,45 @@
 #include "data.h"
 #include "types.h"
 
-GLOBAL_ASM(
-glabel func00047ef0
-.late_rodata
-glabel var70059e20
-.word 0x3f317218
-glabel var70059e24
-.word 0x3f317218
-.text
-/*    47ef0:	27bdffe8 */ 	addiu	$sp,$sp,-24
-/*    47ef4:	44802000 */ 	mtc1	$zero,$f4
-/*    47ef8:	00000000 */ 	nop
-/*    47efc:	4604603c */ 	c.lt.s	$f12,$f4
-/*    47f00:	00000000 */ 	nop
-/*    47f04:	45000004 */ 	bc1f	.L00047f18
-/*    47f08:	00000000 */ 	nop
-/*    47f0c:	44800000 */ 	mtc1	$zero,$f0
-/*    47f10:	10000069 */ 	b	.L000480b8
-/*    47f14:	00000000 */ 	nop
-.L00047f18:
-/*    47f18:	44803000 */ 	mtc1	$zero,$f6
-/*    47f1c:	00000000 */ 	nop
-/*    47f20:	46066032 */ 	c.eq.s	$f12,$f6
-/*    47f24:	00000000 */ 	nop
-/*    47f28:	45000004 */ 	bc1f	.L00047f3c
-/*    47f2c:	00000000 */ 	nop
-/*    47f30:	44800000 */ 	mtc1	$zero,$f0
-/*    47f34:	10000060 */ 	b	.L000480b8
-/*    47f38:	00000000 */ 	nop
-.L00047f3c:
-/*    47f3c:	44804000 */ 	mtc1	$zero,$f8
-/*    47f40:	00000000 */ 	nop
-/*    47f44:	e7a80008 */ 	swc1	$f8,0x8($sp)
-/*    47f48:	3c014000 */ 	lui	$at,0x4000
-/*    47f4c:	44815000 */ 	mtc1	$at,$f10
-/*    47f50:	00000000 */ 	nop
-/*    47f54:	460c503e */ 	c.le.s	$f10,$f12
-/*    47f58:	00000000 */ 	nop
-/*    47f5c:	45000011 */ 	bc1f	.L00047fa4
-/*    47f60:	00000000 */ 	nop
-.L00047f64:
-/*    47f64:	3c014000 */ 	lui	$at,0x4000
-/*    47f68:	44818000 */ 	mtc1	$at,$f16
-/*    47f6c:	00000000 */ 	nop
-/*    47f70:	46106303 */ 	div.s	$f12,$f12,$f16
-/*    47f74:	3c017006 */ 	lui	$at,%hi(var70059e20)
-/*    47f78:	c4249e20 */ 	lwc1	$f4,%lo(var70059e20)($at)
-/*    47f7c:	c7b20008 */ 	lwc1	$f18,0x8($sp)
-/*    47f80:	46049180 */ 	add.s	$f6,$f18,$f4
-/*    47f84:	e7a60008 */ 	swc1	$f6,0x8($sp)
-/*    47f88:	3c014000 */ 	lui	$at,0x4000
-/*    47f8c:	44814000 */ 	mtc1	$at,$f8
-/*    47f90:	00000000 */ 	nop
-/*    47f94:	460c403e */ 	c.le.s	$f8,$f12
-/*    47f98:	00000000 */ 	nop
-/*    47f9c:	4501fff1 */ 	bc1t	.L00047f64
-/*    47fa0:	00000000 */ 	nop
-.L00047fa4:
-/*    47fa4:	3c013f80 */ 	lui	$at,0x3f80
-/*    47fa8:	44815000 */ 	mtc1	$at,$f10
-/*    47fac:	00000000 */ 	nop
-/*    47fb0:	460a603c */ 	c.lt.s	$f12,$f10
-/*    47fb4:	00000000 */ 	nop
-/*    47fb8:	45000012 */ 	bc1f	.L00048004
-/*    47fbc:	00000000 */ 	nop
-.L00047fc0:
-/*    47fc0:	3c014000 */ 	lui	$at,0x4000
-/*    47fc4:	44818000 */ 	mtc1	$at,$f16
-/*    47fc8:	00000000 */ 	nop
-/*    47fcc:	46106302 */ 	mul.s	$f12,$f12,$f16
-/*    47fd0:	00000000 */ 	nop
-/*    47fd4:	3c017006 */ 	lui	$at,%hi(var70059e24)
-/*    47fd8:	c4249e24 */ 	lwc1	$f4,%lo(var70059e24)($at)
-/*    47fdc:	c7b20008 */ 	lwc1	$f18,0x8($sp)
-/*    47fe0:	46049181 */ 	sub.s	$f6,$f18,$f4
-/*    47fe4:	e7a60008 */ 	swc1	$f6,0x8($sp)
-/*    47fe8:	3c013f80 */ 	lui	$at,0x3f80
-/*    47fec:	44814000 */ 	mtc1	$at,$f8
-/*    47ff0:	00000000 */ 	nop
-/*    47ff4:	4608603c */ 	c.lt.s	$f12,$f8
-/*    47ff8:	00000000 */ 	nop
-/*    47ffc:	4501fff0 */ 	bc1t	.L00047fc0
-/*    48000:	00000000 */ 	nop
-.L00048004:
-/*    48004:	240e0001 */ 	addiu	$t6,$zero,0x1
-/*    48008:	afae0014 */ 	sw	$t6,0x14($sp)
-/*    4800c:	3c013f80 */ 	lui	$at,0x3f80
-/*    48010:	44815000 */ 	mtc1	$at,$f10
-/*    48014:	44819000 */ 	mtc1	$at,$f18
-/*    48018:	460a6401 */ 	sub.s	$f16,$f12,$f10
-/*    4801c:	46126100 */ 	add.s	$f4,$f12,$f18
-/*    48020:	46048183 */ 	div.s	$f6,$f16,$f4
-/*    48024:	e7a60010 */ 	swc1	$f6,0x10($sp)
-/*    48028:	3c014000 */ 	lui	$at,0x4000
-/*    4802c:	44814000 */ 	mtc1	$at,$f8
-/*    48030:	c7aa0010 */ 	lwc1	$f10,0x10($sp)
-/*    48034:	460a4482 */ 	mul.s	$f18,$f8,$f10
-/*    48038:	e7b2000c */ 	swc1	$f18,0xc($sp)
-/*    4803c:	c7b00010 */ 	lwc1	$f16,0x10($sp)
-/*    48040:	46108102 */ 	mul.s	$f4,$f16,$f16
-/*    48044:	e7a40010 */ 	swc1	$f4,0x10($sp)
-.L00048048:
-/*    48048:	c7a60008 */ 	lwc1	$f6,0x8($sp)
-/*    4804c:	e7a60004 */ 	swc1	$f6,0x4($sp)
-/*    48050:	8faf0014 */ 	lw	$t7,0x14($sp)
-/*    48054:	c7a8000c */ 	lwc1	$f8,0xc($sp)
-/*    48058:	c7a40008 */ 	lwc1	$f4,0x8($sp)
-/*    4805c:	448f5000 */ 	mtc1	$t7,$f10
-/*    48060:	00000000 */ 	nop
-/*    48064:	468054a0 */ 	cvt.s.w	$f18,$f10
-/*    48068:	46124403 */ 	div.s	$f16,$f8,$f18
-/*    4806c:	46102180 */ 	add.s	$f6,$f4,$f16
-/*    48070:	e7a60008 */ 	swc1	$f6,0x8($sp)
-/*    48074:	c7aa000c */ 	lwc1	$f10,0xc($sp)
-/*    48078:	c7a80010 */ 	lwc1	$f8,0x10($sp)
-/*    4807c:	46085482 */ 	mul.s	$f18,$f10,$f8
-/*    48080:	e7b2000c */ 	swc1	$f18,0xc($sp)
-/*    48084:	8fb80014 */ 	lw	$t8,0x14($sp)
-/*    48088:	27190002 */ 	addiu	$t9,$t8,0x2
-/*    4808c:	afb90014 */ 	sw	$t9,0x14($sp)
-/*    48090:	c7a40008 */ 	lwc1	$f4,0x8($sp)
-/*    48094:	c7b00004 */ 	lwc1	$f16,0x4($sp)
-/*    48098:	46102032 */ 	c.eq.s	$f4,$f16
-/*    4809c:	00000000 */ 	nop
-/*    480a0:	4500ffe9 */ 	bc1f	.L00048048
-/*    480a4:	00000000 */ 	nop
-/*    480a8:	10000003 */ 	b	.L000480b8
-/*    480ac:	c7a00008 */ 	lwc1	$f0,0x8($sp)
-/*    480b0:	10000001 */ 	b	.L000480b8
-/*    480b4:	00000000 */ 	nop
-.L000480b8:
-/*    480b8:	03e00008 */ 	jr	$ra
-/*    480bc:	27bd0018 */ 	addiu	$sp,$sp,0x18
-/*    480c0:	00000000 */ 	nop
-/*    480c4:	00000000 */ 	nop
-/*    480c8:	00000000 */ 	nop
-/*    480cc:	00000000 */ 	nop
-/*    480d0:	00000000 */ 	nop
-/*    480d4:	00000000 */ 	nop
-/*    480d8:	00000000 */ 	nop
-/*    480dc:	00000000 */ 	nop
-/*    480e0:	00000000 */ 	nop
-/*    480e4:	00000000 */ 	nop
-/*    480e8:	00000000 */ 	nop
-/*    480ec:	00000000 */ 	nop
-/*    480f0:	00000000 */ 	nop
-/*    480f4:	00000000 */ 	nop
-/*    480f8:	00000000 */ 	nop
-/*    480fc:	00000000 */ 	nop
-/*    48100:	00000000 */ 	nop
-/*    48104:	00000000 */ 	nop
-/*    48108:	00000000 */ 	nop
-/*    4810c:	00000000 */ 	nop
-/*    48110:	00000000 */ 	nop
-/*    48114:	00000000 */ 	nop
-/*    48118:	00000000 */ 	nop
-/*    4811c:	00000000 */ 	nop
-);
+f32 func00047ef0(f32 arg0)
+{
+	s32 sp14;
+	f32 sp10;
+	f32 sp0c;
+	f32 sp08;
+	f32 sp04;
+
+	if (arg0 < 0) {
+		return 0;
+	}
+
+	if (arg0 == 0) {
+		return 0;
+	}
+
+	sp08 = 0;
+
+	while (arg0 >= 2) {
+		arg0 /= 2;
+		sp08 += 0.6931471824646f;
+	}
+
+	while (arg0 < 1) {
+		arg0 *= 2;
+		sp08 -= 0.6931471824646f;
+	}
+
+	sp14 = 1;
+	sp10 = (arg0 - 1) / (arg0 + 1);
+	sp0c = 2 * sp10;
+	sp10 *= sp10;
+
+	do {
+		sp04 = sp08;
+		sp08 += sp0c / sp14;
+		sp0c *= sp10;
+		sp14 += 2;
+	} while (sp08 != sp04);
+
+	return sp08;
+}
diff --git a/src/lib/ultra/os/writebackdcacheall.s b/src/lib/ultra/os/writebackdcacheall.s
index 2335cb891..2c0c5b7b4 100644
--- a/src/lib/ultra/os/writebackdcacheall.s
+++ b/src/lib/ultra/os/writebackdcacheall.s
@@ -4,6 +4,8 @@
 
 .section .text
 
+.space 0x60
+
 glabel osWritebackDCacheAll
 	lui   $t0, 0x8000
 	addiu $t2, $zero, 0x2000