From c838b225d4362ae312329e700bd51157a6e88772 Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Sun, 17 Nov 2019 13:24:52 +0800
Subject: fcn_fffc7720 from ghidra

---
 src/northbridge/intel/haswell/mrc.asm    | 344 -------------------------------
 src/northbridge/intel/haswell/mrc_misc.c | 167 +++++++++++++++
 src/northbridge/intel/haswell/mrc_misc.h |   1 +
 3 files changed, 168 insertions(+), 344 deletions(-)

diff --git a/src/northbridge/intel/haswell/mrc.asm b/src/northbridge/intel/haswell/mrc.asm
index 38c7281adb..6040017045 100644
--- a/src/northbridge/intel/haswell/mrc.asm
+++ b/src/northbridge/intel/haswell/mrc.asm
@@ -115,7 +115,6 @@ global fcn_fffbd5ac
 global fcn_fffbd7da
 extern fcn_fffc6438
 extern mrc_get_timestamp
-global fcn_fffc7720
 
 ;; pei_usb
 
@@ -40849,349 +40848,6 @@ pop edi
 pop ebp
 ret
 
-fcn_fffc7720:  ; not directly referenced
-push ebp
-xor edx, edx
-mov ebp, esp
-push edi
-push esi
-push ebx
-lea esp, [esp - 0x1c]
-mov esi, dword [ebp + 8]
-lea ebx, [esi + 0x16be]
-mov dword [esi + 0x1700], 0
-lea edi, [esi + 0x2974]
-
-loc_fffc7745:  ; not directly referenced
-imul ecx, edx, 0x1347
-lea eax, [edi + ecx + 8]
-mov dword [eax + 0xf1], 0
-cmp dword [ebx + ecx + 0x12be], 2
-jne short loc_fffc77ac  ; jne 0xfffc77ac
-cmp dword [eax + 0x1151], 2
-jne short loc_fffc7778  ; jne 0xfffc7778
-mov ecx, dword [eax + 0x1222]
-mov dword [eax + 0xf1], ecx
-
-loc_fffc7778:  ; not directly referenced
-cmp dword [eax + 0x124c], 2
-jne short loc_fffc778d  ; jne 0xfffc778d
-mov ecx, dword [eax + 0x131d]
-add dword [eax + 0xf1], ecx
-
-loc_fffc778d:  ; not directly referenced
-mov ecx, dword [esi + 0x1751]
-cmp dword [eax + 0xf1], ecx
-cmovbe ecx, dword [eax + 0xf1]
-mov dword [eax + 0xf1], ecx
-add dword [esi + 0x1700], ecx
-
-loc_fffc77ac:  ; not directly referenced
-inc edx
-cmp edx, 2
-jne short loc_fffc7745  ; jne 0xfffc7745
-mov ecx, dword [esi + 0x1700]
-mov edx, dword [esi + 0x1053]
-mov eax, ecx
-sub eax, dword [esi + 0x104f]
-cmp byte [esi + 0x16b3], 0
-mov dword [esi + 0x16db], eax
-je short loc_fffc77ed  ; je 0xfffc77ed
-cmp ecx, 0x1000
-ja short loc_fffc77ed  ; ja 0xfffc77ed
-mov ebx, ecx
-mov ecx, 0x1000
-shr ebx, 1
-sub ecx, ebx
-cmp edx, ecx
-cmovb edx, ecx
-
-loc_fffc77ed:  ; not directly referenced
-mov ebx, dword [esi + 0x1724]
-mov edi, eax
-mov ecx, ebx
-sub ecx, edx
-mov edx, ecx
-mov ecx, dword [esi + 0x1728]
-lea edx, [edx + ecx + 0x1000]
-cmp edx, eax
-cmovbe edi, edx
-mov edx, edi
-mov dword [esi + 0x16df], edi
-sub edx, ebx
-mov dword [esi + 0x16e3], edx
-mov dword [ebp - 0x1c], edx
-sub edx, ecx
-xor ecx, ecx
-mov dword [esi + 0x16e7], edx
-mov dword [ebp - 0x20], edx
-mov edx, dword [esi + 0x103b]
-cmp byte [esi + 0x102d], 1
-sete cl
-shl ecx, 0xe
-mov dword [ebp - 0x24], ecx
-mov ecx, 3
-mov edx, dword [edx + 0x50]
-and dh, 0xbc
-cmp dword [esi + 0x1728], 3
-cmovbe ecx, dword [esi + 0x1728]
-or edx, dword [ebp - 0x24]
-and ecx, 3
-shl ecx, 8
-or edx, ecx
-cmp ebx, 0x400
-jne short loc_fffc7877  ; jne 0xfffc7877
-and dl, 7
-or dl, 0x88
-jmp short loc_fffc7894  ; jmp 0xfffc7894
-
-loc_fffc7877:  ; not directly referenced
-cmp ebx, 0x3ff
-mov cl, 0x1f
-ja short loc_fffc7889  ; ja 0xfffc7889
-mov ecx, ebx
-shr ecx, 5
-and ecx, 0x1f
-
-loc_fffc7889:  ; not directly referenced
-and ecx, 0x1f
-and dl, 7
-shl ecx, 3
-or edx, ecx
-
-loc_fffc7894:  ; not directly referenced
-mov ebx, dword [esi + 0x1057]
-mov dword [esi + 0x16eb], edx
-mov edx, dword [esi + 0x105f]
-mov ecx, dword [ebp - 0x20]
-mov dword [esi + 0x171c], edx
-mov edx, ebx
-sub ecx, ebx
-neg edx
-and edx, ecx
-sub ecx, edx
-mov dword [esi + 0x16ef], edx
-je short loc_fffc78e1  ; je 0xfffc78e1
-mov edx, dword [ebp - 0x20]
-sub edx, ecx
-mov dword [esi + 0x16e7], edx
-mov edx, dword [ebp - 0x1c]
-sub edx, ecx
-mov dword [esi + 0x16e3], edx
-mov edx, edi
-sub edx, ecx
-mov dword [esi + 0x16df], edx
-
-loc_fffc78e1:  ; not directly referenced
-cmp byte [esi + 0x1030], 0
-je short loc_fffc7941  ; je 0xfffc7941
-mov edx, dword [esi + 0x16df]
-cmp eax, edx
-jbe short loc_fffc7941  ; jbe 0xfffc7941
-cmp eax, 0x1000
-mov ebx, 0x1000
-mov ecx, ebx
-mov byte [esi + 0x16f3], 1
-cmovae ecx, eax
-cmova eax, ebx
-add eax, ecx
-mov dword [esi + 0x16f4], ecx
-sub eax, edx
-cmp dword [esi + 0x1005], HASWELL_FAMILY_MOBILE
-mov dword [esi + 0x16f8], eax
-mov dword [esi + 0x16fc], eax
-jne short loc_fffc7938  ; jne 0xfffc7938
-cmp dword [esi + 0x1001], 1
-je short loc_fffc794e  ; je 0xfffc794e
-
-loc_fffc7938:  ; not directly referenced
-dec eax
-mov dword [esi + 0x16f8], eax
-jmp short loc_fffc794e  ; jmp 0xfffc794e
-
-loc_fffc7941:  ; not directly referenced
-mov byte [esi + 0x16f3], 0
-mov dword [esi + 0x16fc], eax
-
-loc_fffc794e:  ; not directly referenced
-cmp byte [esi + 0x173c], 0
-je short loc_fffc79c0  ; je 0xfffc79c0
-cmp byte [esi + 0x16b3], 0
-je short loc_fffc797c  ; je 0xfffc797c
-cmp dword [esi + 0x1700], 0x1000
-ja short loc_fffc7974  ; ja 0xfffc7974
-mov eax, dword [esi + 0x16fc]
-jmp short loc_fffc7988  ; jmp 0xfffc7988
-
-loc_fffc7974:  ; not directly referenced
-mov eax, dword [esi + 0x16db]
-jmp short loc_fffc7988  ; jmp 0xfffc7988
-
-loc_fffc797c:  ; not directly referenced
-mov eax, dword [esi + 0x16ef]
-sub eax, dword [esi + 0x105f]
-
-loc_fffc7988:  ; not directly referenced
-movzx edx, byte [esi + 0x173e]
-shl edx, 3
-mov dword [esi + 0x1710], edx
-not edx
-add eax, edx
-movzx edx, byte [esi + 0x173d]
-and eax, 0xfffffff0
-shl edx, 3
-mov dword [esi + 0x170c], eax
-sub eax, edx
-mov dword [esi + 0x1718], edx
-sub eax, 0x10
-mov dword [esi + 0x1714], eax
-
-loc_fffc79c0:  ; not directly referenced
-mov eax, dword [esi + 0x16db]
-mov edi, dword [esi + 0x1700]
-mov dword [esi + 0x1704], eax
-mov ecx, dword [esi + 0x103b]
-mov eax, dword [esi + 0x104f]
-xor edx, edx
-mov dword [esi + 0x1708], eax
-mov eax, edi
-shr edi, 0xc
-and edx, 0xffffff80
-and edi, 0x7f
-mov ebx, dword [esi + 0x1047]
-shl eax, 0x14
-or edx, edi
-mov dword [ecx + 0xa0], eax
-mov dword [ecx + 0xa4], edx
-movzx eax, word [esi + 0x16df]
-xor edx, edx
-shl eax, 0x14
-and edx, 0xffffff80
-mov dword [ecx + 0xbc], eax
-mov edi, dword [esi + 0x16fc]
-mov eax, edi
-shr edi, 0xc
-shl eax, 0x14
-and edi, 0x7f
-or edx, edi
-mov dword [ecx + 0xa8], eax
-mov dword [ecx + 0xac], edx
-cmp byte [esi + 0x16f3], 0
-je short loc_fffc7a8d  ; je 0xfffc7a8d
-mov edi, dword [esi + 0x16f4]
-xor edx, edx
-mov eax, edi
-and edx, 0xffffff80
-shr edi, 0xc
-shl eax, 0x14
-and edi, 0x7f
-or edx, edi
-mov dword [ecx + 0x90], eax
-mov dword [ecx + 0x94], edx
-mov edi, dword [esi + 0x16f8]
-mov eax, edi
-xor edx, edx
-shr edi, 0xc
-and edx, 0xffffff80
-shl eax, 0x14
-and edi, 0x7f
-or edx, edi
-mov dword [ecx + 0x98], eax
-mov dword [ecx + 0x9c], edx
-
-loc_fffc7a8d:  ; not directly referenced
-movzx eax, word [esi + 0x16ef]
-shl eax, 0x14
-mov dword [ecx + 0xb8], eax
-mov edx, dword [esi + 0x171c]
-test edx, edx
-je short loc_fffc7abd  ; je 0xfffc7abd
-movzx edx, dl
-mov eax, dword [ecx + 0x5c]
-shl edx, 4
-and eax, 0xfffff00f
-or eax, edx
-or eax, 4
-mov dword [ecx + 0x5c], eax
-
-loc_fffc7abd:  ; not directly referenced
-movzx eax, word [esi + 0x16e3]
-shl eax, 0x14
-mov dword [ecx + 0xb0], eax
-movzx eax, word [esi + 0x16e7]
-shl eax, 0x14
-mov dword [ecx + 0xb4], eax
-mov edx, dword [esi + 0x1708]
-test edx, edx
-je short loc_fffc7b35  ; je 0xfffc7b35
-mov eax, 0x80000
-mov dword [ebp - 0x14], 0
-sub eax, edx
-mov edx, eax
-shl edx, 0x14
-shr eax, 0xc
-or dh, 8
-mov dword [ebp - 0x18], edx
-mov edx, dword [ebp - 0x14]
-and eax, 0x7f
-and edx, 0xffffff80
-or edx, eax
-mov eax, dword [ebp - 0x18]
-mov dword [ecx + 0x78], eax
-mov dword [ecx + 0x7c], edx
-mov edi, dword [esi + 0x1704]
-xor edx, edx
-mov eax, edi
-and edx, 0xffffff80
-shr edi, 0xc
-shl eax, 0x14
-and edi, 0x7f
-or edx, edi
-mov dword [ecx + 0x70], eax
-mov dword [ecx + 0x74], edx
-
-loc_fffc7b35:  ; not directly referenced
-mov eax, dword [esi + 0x16eb]
-mov dword [ecx + 0x50], eax
-mov eax, dword [esi + 0x170c]
-shl eax, 0xe
-mov dword [ebx + 0x10], eax
-mov eax, dword [esi + 0x170c]
-and eax, 0x40000
-shr eax, 0x12
-mov dword [ebx + 0x14], eax
-mov edx, dword [esi + 0x170c]
-mov eax, dword [esi + 0x1710]
-add eax, edx
-shr eax, 3
-shr edx, 3
-shl eax, 0x10
-or eax, edx
-mov dword [ebx + 0x18], eax
-mov eax, dword [esi + 0x1714]
-shl eax, 0xe
-mov dword [ebx + 0x20], eax
-mov eax, dword [esi + 0x1714]
-and eax, 0x40000
-shr eax, 0x12
-or eax, 4
-mov dword [ebx + 0x24], eax
-mov edx, dword [esi + 0x1714]
-mov eax, dword [esi + 0x1718]
-add eax, edx
-shr eax, 3
-shl eax, 0x10
-shr edx, 3
-or eax, edx
-mov dword [ebx + 0x28], eax
-lea esp, [esp + 0x1c]
-pop ebx
-xor eax, eax
-pop esi
-pop edi
-pop ebp
-ret
-
 loc_fffc7bbe:
 db 0x00
 db 0x00
diff --git a/src/northbridge/intel/haswell/mrc_misc.c b/src/northbridge/intel/haswell/mrc_misc.c
index 1c10985bba..33f7334289 100644
--- a/src/northbridge/intel/haswell/mrc_misc.c
+++ b/src/northbridge/intel/haswell/mrc_misc.c
@@ -1451,3 +1451,170 @@ int fcn_fffa7a1c(void *ramdata)
 		}
 	} while (true);
 }
+
+int fcn_fffc7720(void *ramdata)
+{
+	uint32_t uVar1;
+	uint32_t uVar2;
+	uint32_t uVar3;
+	uint32_t uVar4;
+	uint32_t uVar5;
+	int iVar6;
+	int iVar7;
+	uint32_t uVar8;
+	int iVar9;
+	uint32_t uVar10;
+	void *ptr0;
+
+	PRINT_FUNC;
+
+	*(uint32_t *)(ramdata + 0x1700) = 0;
+	for (int i = 0; i < 2; i++) {
+		ptr0 = (ramdata + i * 0x1347 + 0x297c);
+		*(uint32_t*)(ptr0 + 0xf1) = 0;
+		if (*(int *)(ramdata + i * 0x1347 + 0x297c) == 2) {
+			if (*(int *)(ptr0 + 0x1151) == 2) {
+				*(uint32_t*)(ptr0 + 0xf1) = *(uint32_t*)(ptr0 + 0x1222);
+			}
+			if (*(int *)(ptr0 + 0x124c) == 2) {
+				*(int *)(ptr0 + 0xf1) = *(int *)(ptr0 + 0xf1) + *(int *)(ptr0 + 0x131d);
+			}
+			uint32_t tmp = *(uint32_t*)(ramdata + 0x1751);
+			if (*(uint32_t*)(ptr0 + 0xf1) < tmp || *(uint32_t*)(ptr0 + 0xf1) == tmp) {
+				tmp = *(uint32_t*)(ptr0 + 0xf1);
+			}
+			*(uint32_t*)(ptr0 + 0xf1) = tmp;
+			*(int *)(ramdata + 0x1700) = *(int *)(ramdata + 0x1700) + tmp;
+		}
+	}
+	uVar2 = *(uint32_t*)(ramdata + 0x1700);
+	uVar8 = *(uint32_t*)(ramdata + 0x1053);
+	uVar1 = uVar2 - *(int *)(ramdata + 0x104f);
+	*(uint32_t*)(ramdata + 0x16db) = uVar1;
+	if (((*(char *)(ramdata + 0x16b3) != '\0') && (uVar2 < 0x1001)) &&
+			(uVar2 = 0x1000 - (uVar2 >> 1), uVar8 < uVar2)) {
+		uVar8 = uVar2;
+	}
+	uVar10 = *(uint32_t*)(ramdata + 0x1724);
+	uVar2 = (uVar10 - uVar8) + 0x1000 + *(int *)(ramdata + 0x1728);
+	uVar8 = uVar1;
+	if (uVar2 <= uVar1) {
+		uVar8 = uVar2;
+	}
+	*(uint32_t*)(ramdata + 0x16df) = uVar8;
+	iVar7 = uVar8 - uVar10;
+	*(int *)(ramdata + 0x16e3) = iVar7;
+	iVar9 = iVar7 - *(int *)(ramdata + 0x1728);
+	*(int *)(ramdata + 0x16e7) = iVar9;
+	uVar3 = (uint32_t)(*(char *)(ramdata + 0x102d) == '\x01') << 0xe;
+	uVar4 = 3;
+	uVar2 = pci_read_config32(PCI_DEV(0, 0, 0), 0x50);
+	if (*(uint32_t*)(ramdata + 0x1728) < 4) {
+		uVar4 = *(uint32_t*)(ramdata + 0x1728);
+	}
+	uVar4 = (uVar4 & 3) << 8;
+	if (uVar10 == 0x400) {
+		uVar2 = (uVar2 & 0xffffbc07) | uVar3 | uVar4 | 0x88;
+	} else {
+		uVar5 = 0x1f;
+		if (uVar10 < 0x400) {
+			uVar5 = (uVar10 >> 5) & 0x1f;
+		}
+		uVar2 = (uVar2 & 0xffffbc07) | uVar3 | uVar4 | uVar5 << 3;
+	}
+	*(uint32_t*)(ramdata + 0x16eb) = uVar2;
+	*(uint32_t*)(ramdata + 0x171c) = *(uint32_t*)(ramdata + 0x105f);
+	uVar2 = iVar9 - *(int *)(ramdata + 0x1057);
+	uVar10 = (-*(int *)(ramdata + 0x1057)) & uVar2;
+	iVar6 = uVar2 - uVar10;
+	*(uint32_t*)(ramdata + 0x16ef) = uVar10;
+	if (iVar6 != 0) {
+		*(int *)(ramdata + 0x16e7) = iVar9 - iVar6;
+		*(int *)(ramdata + 0x16e3) = iVar7 - iVar6;
+		*(int *)(ramdata + 0x16df) = uVar8 - iVar6;
+	}
+	if ((*(char *)(ramdata + 0x1030) == '\0') || (uVar1 <= *(uint32_t*)(ramdata + 0x16df))) {
+		*(uint8_t*)(ramdata + 0x16f3) = 0;
+		*(uint32_t*)(ramdata + 0x16fc) = uVar1;
+	} else {
+		*(uint8_t*)(ramdata + 0x16f3) = 1;
+		uVar2 = 0x1000;
+		if (0xfff < uVar1) {
+			uVar2 = uVar1;
+		}
+		if (0x1000 < uVar1) {
+			uVar1 = 0x1000;
+		}
+		*(uint32_t*)(ramdata + 0x16f4) = uVar2;
+		iVar7 = (uVar1 + uVar2) - *(uint32_t*)(ramdata + 0x16df);
+		*(int *)(ramdata + 0x16f8) = iVar7;
+		*(int *)(ramdata + 0x16fc) = iVar7;
+		if ((*(int *)(ramdata + 0x1005) != 0x306c0) || (*(int *)(ramdata + 0x1001) != 1)) {
+			*(int *)(ramdata + 0x16f8) = iVar7 + -1;
+		}
+	}
+	if (*(char *)(ramdata + 0x173c) != '\0') {
+		if (*(char *)(ramdata + 0x16b3) == '\0') {
+			iVar7 = *(int *)(ramdata + 0x16ef) - *(int *)(ramdata + 0x105f);
+		} else {
+			if (*(uint32_t*)(ramdata + 0x1700) < 0x1001) {
+				iVar7 = *(int *)(ramdata + 0x16fc);
+			}
+			else {
+				iVar7 = *(int *)(ramdata + 0x16db);
+			}
+		}
+		uVar2 = (uint32_t)(*(uint8_t*)(ramdata + 0x173e)) << 3;
+		*(uint32_t*)(ramdata + 0x1710) = uVar2;
+		uVar2 = (iVar7 + ~uVar2) & 0xfffffff0;
+		*(uint32_t*)(ramdata + 0x170c) = uVar2;
+		*(int *)(ramdata + 0x1718) = (uint32_t)(*(uint8_t*)(ramdata + 0x173d)) * 8;
+		*(int *)(ramdata + 0x1714) = uVar2 + (uint32_t)(*(uint8_t*)(ramdata + 0x173d)) * (-8) + -0x10;
+	}
+	uVar2 = *(uint32_t*)(ramdata + 0x1700);
+	*(uint32_t*)(ramdata + 0x1704) = *(uint32_t*)(ramdata + 0x16db);
+	iVar7 = *(int *)(ramdata + 0x103b); // pciexbar
+	*(uint32_t*)(ramdata + 0x1708) = *(uint32_t*)(ramdata + 0x104f);
+	void *gdxcbar = *(void**)(ramdata + 0x1047);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xa0, uVar2 << 0x14);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xa4, (uVar2 >> 0xc) & 0x7f);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xbc, ((uint32_t)(*(uint16_t*)(ramdata + 0x16df))) << 0x14);
+	uVar2 = *(uint32_t*)(ramdata + 0x16fc);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xa8, uVar2 << 0x14);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xac, (uVar2 >> 0xc) & 0x7f);
+	if (*(char *)(ramdata + 0x16f3) != '\0') {
+		uVar2 = *(uint32_t*)(ramdata + 0x16f4);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x90, uVar2 << 0x14);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x94, (uVar2 >> 0xc) & 0x7f);
+		uVar2 = *(uint32_t*)(ramdata + 0x16f8);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x98, uVar2 << 0x14);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x9c, (uVar2 >> 0xc) & 0x7f);
+	}
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xb8, (uint32_t)(*(uint16_t*)(ramdata + 0x16ef)) << 0x14);
+	if (*(uint32_t*)(ramdata + 0x171c) != 0) {
+		pci_update_config32(PCI_DEV(0, 0, 0), 0x5c, 0xfffff00f,
+				((*(uint32_t*)(ramdata + 0x171c) & 0xff) << 4) | 4);
+	}
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xb0, (uint32_t)(*(uint16_t*)(ramdata + 0x16e3)) << 0x14);
+	pci_write_config32(PCI_DEV(0, 0, 0), 0xb4, (uint32_t)(*(uint16_t*)(ramdata + 0x16e7)) << 0x14);
+	iVar6 = *(int *)(ramdata + 0x1708);
+	if (iVar6 != 0) {
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x78, ((0x80000 - iVar6) << 20) | 0x800);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x7c, ((0x80000 - iVar6) >> 0xc) & 0x7f);
+		uVar2 = *(uint32_t*)(ramdata + 0x1704);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x70, uVar2 << 0x14);
+		pci_write_config32(PCI_DEV(0, 0, 0), 0x74, (uVar2 >> 0xc) & 0x7f);
+	}
+	pci_write_config32(PCI_DEV(0, 0, 0), 0x50, *(uint32_t*)(ramdata + 0x16eb));
+	*(int *)(gdxcbar + 0x10) = *(int *)(ramdata + 0x170c) << 0xe;
+	*(uint32_t*)(gdxcbar + 0x14) = (*(uint32_t*)(ramdata + 0x170c) & 0x40000) >> 0x12;
+	*(uint32_t*)(gdxcbar + 0x18) =
+		(((*(int *)(ramdata + 0x1710) + *(uint32_t*)(ramdata + 0x170c)) >> 3) << 0x10) |
+		(*(uint32_t*)(ramdata + 0x170c) >> 3);
+	*(int *)(gdxcbar + 0x20) = *(int *)(ramdata + 0x1714) << 0xe;
+	*(uint32_t*)(gdxcbar + 0x24) = ((*(uint32_t*)(ramdata + 0x1714) & 0x40000) >> 0x12) | 4;
+	*(uint32_t*)(gdxcbar + 0x28) =
+		((*(int *)(ramdata + 0x1718) + *(uint32_t*)(ramdata + 0x1714)) >> 3) << 0x10 |
+		(*(uint32_t*)(ramdata + 0x1714) >> 3);
+	return 0;
+}
diff --git a/src/northbridge/intel/haswell/mrc_misc.h b/src/northbridge/intel/haswell/mrc_misc.h
index 5c1756b3a6..fc4db0e296 100644
--- a/src/northbridge/intel/haswell/mrc_misc.h
+++ b/src/northbridge/intel/haswell/mrc_misc.h
@@ -55,3 +55,4 @@ DECL_CB1(fcn_fffb7866);
 
 int fcn_fffb8689(void *ramdata);
 int fcn_fffa7a1c(void *ramdata);
+int fcn_fffc7720(void *ramdata);
-- 
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