From ee3ad3b3fa07257f7933b80b3a243dac9014ae23 Mon Sep 17 00:00:00 2001
From: Antoine Cure <tinei@protonmail.com>
Date: Mon, 10 Feb 2020 02:26:55 +0100
Subject: [PATCH] WIP: get PCI config base address from MCFG table

---
 include/io/acpi.h      | 17 +++++++++++++++++
 kaleid/kernel/io/pci.c |  4 +++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/io/acpi.h b/include/io/acpi.h
index 917a682..fb43fa7 100644
--- a/include/io/acpi.h
+++ b/include/io/acpi.h
@@ -196,6 +196,23 @@ struct FADT_t
 
 //----------------------------------------------------------------------------//
 
+struct SDT_MCFG_t {
+  char signature[4];
+  uint length;
+  uchar revision;
+  uchar checksum;
+  char OEMID[6];
+  char OEMTableID[8];
+  uint OEMRevision;
+  uint creatorID;
+  uint creatorRevision;
+  uint sdtEntry;
+  
+  ulong PCIConfigBaseAddress;
+};
+
+//----------------------------------------------------------------------------//
+
 void IoInitAcpi(void);
 
 SDTHeader_t *IoGetAcpiTable(ulong id);
diff --git a/kaleid/kernel/io/pci.c b/kaleid/kernel/io/pci.c
index e8a7e64..9b29a9a 100644
--- a/kaleid/kernel/io/pci.c
+++ b/kaleid/kernel/io/pci.c
@@ -29,8 +29,10 @@
 
 void pciGetDevice(ushort vendorID, ushort deviceID, int deviceType)
 {
-    if(IoGetAcpiTable(SDT_MCFG) == NULL)
+    struct SDT_MCFG_t *MCFG_table = (struct SDT_MCFG_t*)IoGetAcpiTable(SDT_MCFG);
+    if(MCFG_table == NULL)
     {
         KernLog("Unable to access PCI configuration : MCFG table not reachable\n");
     }
+    KernLog("PCI Config Base address = %ld", MCFG_table->PCIConfigBaseAddress);
 }