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[HALX86] Print the correct size of the BAR in HalpDebugPciDumpBus()

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Reference: https://wiki.osdev.org/PCI#Address_and_size_of_the_BAR

To determine the amount of address space needed by a PCI device,
you must save the original value of the BAR, write a value
of all 1's to the register, then read it back.

Note: 64-bit BARs are not supported yet.
This commit is contained in:
Dmitry Borisov 2022-05-26 19:40:17 +06:00 committed by GitHub
parent 11e0ed3c2b
commit 6f4be52a1c
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 28 additions and 6 deletions
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2
hal/halx86/include/halp.h
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@ -516,6 +516,8 @@ CODE_SEG("INIT")
VOID
NTAPI
HalpDebugPciDumpBus(
IN PBUS_HANDLER BusHandler,
IN PCI_SLOT_NUMBER PciSlot,
IN ULONG i,
IN ULONG j,
IN ULONG k,

32
hal/halx86/legacy/bussupp.c
View file

@ -787,7 +787,9 @@ ShowSize(ULONG x)
CODE_SEG("INIT")
VOID
NTAPI
HalpDebugPciDumpBus(IN ULONG i,
HalpDebugPciDumpBus(IN PBUS_HANDLER BusHandler,
IN PCI_SLOT_NUMBER PciSlot,
IN ULONG i,
IN ULONG j,
IN ULONG k,
IN PPCI_COMMON_CONFIG PciData)
@ -963,12 +965,30 @@ HalpDebugPciDumpBus(IN ULONG i,
Mem = 0;
if (Mem)
{
ULONG PciBar = 0xFFFFFFFF;
HalpWritePCIConfig(BusHandler,
PciSlot,
&PciBar,
FIELD_OFFSET(PCI_COMMON_HEADER, u.type0.BaseAddresses[b]),
sizeof(ULONG));
HalpReadPCIConfig(BusHandler,
PciSlot,
&PciBar,
FIELD_OFFSET(PCI_COMMON_HEADER, u.type0.BaseAddresses[b]),
sizeof(ULONG));
HalpWritePCIConfig(BusHandler,
PciSlot,
&Mem,
FIELD_OFFSET(PCI_COMMON_HEADER, u.type0.BaseAddresses[b]),
sizeof(ULONG));
/* Decode the address type */
if (Mem & PCI_ADDRESS_IO_SPACE)
if (PciBar & PCI_ADDRESS_IO_SPACE)
{
/* Guess the size */
Size = 1 << 2;
while (!(Mem & Size) && (Size)) Size <<= 1;
while (!(PciBar & Size) && (Size)) Size <<= 1;
/* Print it out */
DbgPrint("\tI/O ports at %04lx", Mem & PCI_ADDRESS_IO_ADDRESS_MASK);
@ -977,8 +997,8 @@ HalpDebugPciDumpBus(IN ULONG i,
else
{
/* Guess the size */
Size = 1 << 8;
while (!(Mem & Size) && (Size)) Size <<= 1;
Size = 1 << 4;
while (!(PciBar & Size) && (Size)) Size <<= 1;
/* Print it out */
DbgPrint("\tMemory at %08lx (%d-bit, %sprefetchable)",
@ -1102,7 +1122,7 @@ HalpInitializePciBus(VOID)
if (PciData->VendorID == PCI_INVALID_VENDORID) continue;
/* Print out the entry */
HalpDebugPciDumpBus(i, j, k, PciData);
HalpDebugPciDumpBus(BusHandler, PciSlot, i, j, k, PciData);
/* Check if this is a Cardbus bridge */
if (PCI_CONFIGURATION_TYPE(PciData) == PCI_CARDBUS_BRIDGE_TYPE)