[reactos] 01/01: [HALX86] Print the correct size of the BAR in HalpDebugPciDumpBus()

[Dmitry Borisov]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=6f4be52a1c710ac062d35…

commit 6f4be52a1c710ac062d35a8c9083c0dcec69827e
Author:     Dmitry Borisov <di.sean(a)protonmail.com>
AuthorDate: Thu May 26 19:40:17 2022 +0600
Commit:     GitHub <noreply(a)github.com>
CommitDate: Thu May 26 16:40:17 2022 +0300

    [HALX86] Print the correct size of the BAR in HalpDebugPciDumpBus()
    
    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.
---
 hal/halx86/include/halp.h   |  2 ++
 hal/halx86/legacy/bussupp.c | 32 ++++++++++++++++++++++++++------
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/hal/halx86/include/halp.h b/hal/halx86/include/halp.h
index 62d0254773e..5446482dfc8 100644
--- a/hal/halx86/include/halp.h
+++ b/hal/halx86/include/halp.h
@@ -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,
diff --git a/hal/halx86/legacy/bussupp.c b/hal/halx86/legacy/bussupp.c
index 97b535285d3..f967ece635c 100644
--- a/hal/halx86/legacy/bussupp.c
+++ b/hal/halx86/legacy/bussupp.c
@@ -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)