2 * inteltool - dump all registers on an Intel CPU + chipset based system.
4 * Copyright (C) 2008-2010 by coresystems GmbH
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "inteltool.h"
26 * (G)MCH MMIO Config Space
28 int print_mchbar(struct pci_dev *nb, struct pci_access *pacc)
30 int i, size = (16 * 1024);
31 volatile uint8_t *mchbar;
33 struct pci_dev *nb_device6; /* "overflow device" on i865 */
36 printf("\n============= MCHBAR ============\n\n");
38 switch (nb->device_id) {
39 case PCI_DEVICE_ID_INTEL_82865:
41 * On i865, the memory access enable/disable bit (MCHBAREN on
42 * i945/i965) is not in the MCHBAR (i945/i965) register but in
43 * the PCICMD6 register. BAR6 and PCICMD6 reside on device 6.
45 * The actual base address is in BAR6 on i865 where on
46 * i945/i965 the base address is in MCHBAR.
48 nb_device6 = pci_get_dev(pacc, 0, 0, 0x06, 0); /* Device 6 */
49 mchbar_phys = pci_read_long(nb_device6, 0x10); /* BAR6 */
50 pcicmd6 = pci_read_long(nb_device6, 0x04); /* PCICMD6 */
52 /* Try to enable Memory Access Enable (MAE). */
53 if (!(pcicmd6 & (1 << 1))) {
54 printf("Access to BAR6 is currently disabled, "
55 "attempting to enable.\n");
56 pci_write_long(nb_device6, 0x04, pcicmd6 | (1 << 1));
57 if (pci_read_long(nb_device6, 0x04) & (1 << 1))
58 printf("Enabled successfully.\n");
60 printf("Enable FAILED!\n");
62 mchbar_phys &= 0xfffff000; /* Bits 31:12 from BAR6 */
64 case PCI_DEVICE_ID_INTEL_82915:
65 case PCI_DEVICE_ID_INTEL_82945GM:
66 case PCI_DEVICE_ID_INTEL_82945GSE:
67 case PCI_DEVICE_ID_INTEL_82945P:
68 case PCI_DEVICE_ID_INTEL_82975X:
69 mchbar_phys = pci_read_long(nb, 0x44) & 0xfffffffe;
71 case PCI_DEVICE_ID_INTEL_PM965:
72 case PCI_DEVICE_ID_INTEL_82Q35:
73 case PCI_DEVICE_ID_INTEL_82G33:
74 case PCI_DEVICE_ID_INTEL_82Q33:
75 mchbar_phys = pci_read_long(nb, 0x48) & 0xfffffffe;
76 mchbar_phys |= ((uint64_t)pci_read_long(nb, 0x4c)) << 32;
78 case PCI_DEVICE_ID_INTEL_Q965:
79 case PCI_DEVICE_ID_INTEL_ATOM_DXXX:
80 case PCI_DEVICE_ID_INTEL_ATOM_NXXX:
81 mchbar_phys = pci_read_long(nb, 0x48);
83 /* Test if bit 0 of the MCHBAR reg is 1 to enable memory reads.
84 * If it isn't, try to set it. This may fail, because there is
85 * some bit that locks that bit, and isn't in the public
89 if(!(mchbar_phys & 1))
91 printf("Access to the MCHBAR is currently disabled, "\
92 "attempting to enable.\n");
94 pci_write_long(nb, 0x48, mchbar_phys);
95 if(pci_read_long(nb, 0x48) & 1)
96 printf("Enabled successfully.\n");
98 printf("Enable FAILED!\n");
100 mchbar_phys &= 0xfffffffe;
101 mchbar_phys |= ((uint64_t)pci_read_long(nb, 0x4c)) << 32;
103 case PCI_DEVICE_ID_INTEL_82443LX:
104 case PCI_DEVICE_ID_INTEL_82443BX:
105 case PCI_DEVICE_ID_INTEL_82810:
106 case PCI_DEVICE_ID_INTEL_82810E_MC:
107 case PCI_DEVICE_ID_INTEL_82810DC:
108 case PCI_DEVICE_ID_INTEL_82830M:
109 printf("This northbridge does not have MCHBAR.\n");
111 case PCI_DEVICE_ID_INTEL_GS45:
112 mchbar_phys = pci_read_long(nb, 0x48) & 0xfffffffe;
113 mchbar_phys |= ((uint64_t)pci_read_long(nb, 0x4c)) << 32;
116 printf("Error: Dumping MCHBAR on this northbridge is not (yet) supported.\n");
120 mchbar = map_physical(mchbar_phys, size);
122 if (mchbar == NULL) {
123 if (nb->device_id == PCI_DEVICE_ID_INTEL_82865)
124 perror("Error mapping BAR6");
126 perror("Error mapping MCHBAR");
130 if (nb->device_id == PCI_DEVICE_ID_INTEL_82865)
131 printf("BAR6 = 0x%08llx (MEM)\n\n", mchbar_phys);
133 printf("MCHBAR = 0x%08llx (MEM)\n\n", mchbar_phys);
135 for (i = 0; i < size; i += 4) {
136 if (*(uint32_t *)(mchbar + i))
137 printf("0x%04x: 0x%08x\n", i, *(uint32_t *)(mchbar+i));
140 unmap_physical((void *)mchbar, size);