WIP : MCFG #73

include/io/acpi.h

@@ -110,10 +110,11 @@ enum {
     SDT_SRAT,
     SDT_SSDT,
     SDT_XSDT,
-    SDT_HEPT
+    SDT_HEPT,
+    SDT_MCFG
 };
 
-#define N_SDT_TYPES 23
+#define N_SDT_TYPES 24
 
 //----------------------------------------------------------------------------//
 // FADT related

kaleid/kernel/io/acpi.c

@@ -57,7 +57,8 @@ static char *SDTChar[N_SDT_TYPES] = {
     "SRAT",
     "SSDT",
     "XSDT",
-    "HPET"
+    "HPET",
+    "MCFG"
 };
 
 // ACPI Tables Directory
@@ -184,6 +185,31 @@ static inline void IoInitRXSDT(void)
     }
 }
 
+//
+// Returns the address of the MCFG
+//
+static inline SDTHeader_t *IoFindMCFG()
+{
+    char *mcfg = NULL;
+
+    for (uint i = 0; i < memoryMap.length; i++) {
+        if (memoryMap.entry[i].type == RESERVED_ZONE) {
+
+            for (mcfg = (char *)memoryMap.entry[i].addr;
+              (ulong)mcfg < (ulong)(memoryMap.entry[i].addr +
+                                   memoryMap.entry[i].length);
+              mcfg++) {
+
+                if (!strncmp(mcfg, "MCFG", 3)) {
+                    return (SDTHeader_t *)mcfg;
+                }
+            }
+        }
+    }
+
+    return NULL;
+}
+
 //
 // Explore all ACPI Tables
 //
@@ -257,6 +283,25 @@ static inline void IoSearchAcpiTables(void)
                 SDTDirectory[SDT_DSDT] = dsdt;
         }
     }
+
+    // Finding MCFG
+    SDTHeader_t *mcfg = IoFindMCFG();
+
+    if (mcfg) {
+        //DebugLog("MCFG found at %p\n");
+        checksum = 0; //DoChecksum(mcfg, (size_t)mcfg->length, 0, 0);
+        if (!checksum) {
+            if (!strncmp(mcfg->signature, SDTChar[SDT_MCFG], 3)) {
+                    DebugLog("ACPI System Table %s (OEM %s) length %lu [%p]\n",
+                        SDTChar[SDT_MCFG],
+                        mcfg->OEMID,
+                        mcfg->length,
+                        mcfg
+                    );
+                    SDTDirectory[SDT_MCFG] = mcfg;
+            }
+        }
+    }
 }
 
 // -------------------------------------------------------------------------- //
@@ -268,9 +313,7 @@ void IoInitAcpi(void)
 {
     // MAP ACPI PAGES
 
-    // Search the zone where the start address is
     for (uint i = 0; i < memoryMap.length; i++) {
-        // if the address is in an available zone, we can return the length
         if (memoryMap.entry[i].type != AVAILABLE_ZONE) {
 
             // Map each page that is in the busy zone