RSDT read and controlled

include/io/acpi.h

@@ -73,8 +73,7 @@ struct SDTHeader {
 
 //----------------------------------------------------------------------------//
 
-void IoTestAcpi(void);
+void IoInitAcpi(void);
-RSDPDescriptor *IoFindRSDP(void);
 
 //----------------------------------------------------------------------------//
 

kaleid/kernel/init/init.c

@@ -82,7 +82,7 @@ noreturn void BtStartKern(multiboot_info_t *mbInfo, uint mbMagic, void *codeSeg)
     IoEnableKeyb();
 
     // ACPI
-    IoTestAcpi();
+    IoInitAcpi();
 
     // Scheduler
     PsInitSched();

kaleid/kernel/io/acpi.c

@@ -27,8 +27,14 @@
 #include <io/acpi.h>
 #include <mm/paging.h>
 
-SDTHeader *AcpiSDHeader = NULL;
+SDTHeader *AcpiSDT = NULL;
+SDTHeader *AcpiFADT = NULL;
 
+char IoACPIVersion = 1;
+
+//
+// Returns the checksum of the given structure
+//
 static inline char DoChecksum(void *ptr, size_t size,
                          size_t intermediateSize, ulong reason)
 {
@@ -41,64 +47,10 @@ static inline char DoChecksum(void *ptr, size_t size,
     return checksum;
 }
 
-void IoTestAcpi(void)
+//
-{
+// Returns the address of the RSDP
-    uchar checksum = 0;
+//
-
+static inline RSDPDescriptor *IoFindRSDP()
-    if (BtFirmwareInfo.romValid)
-        KernLog("\tRom Table is valid at %p\n", BtFirmwareInfo.romTable);
-
-    if (BtFirmwareInfo.apmValid)
-        KernLog("\tApm Table is valid at %p\n", BtFirmwareInfo.apmTable);
-
-    // FIND RSDP
-
-    RSDPDescriptor *rsdp = IoFindRSDP();
-    if (!rsdp)
-        KeStartPanic("ACPI RSDP not found in memory");
-
-    // Checksum calculation
-    checksum = DoChecksum(rsdp, (size_t)sizeof(RSDPDescriptor),
-                          (size_t)sizeof(struct RSDPLegacy),
-                          !rsdp->legacy.revision
-                          );
-
-    if (checksum)
-        KeStartPanic("Invalid checksum : %d vs 0", checksum);
-
-    if (rsdp->legacy.revision == 1 || rsdp->legacy.revision >= 3)
-        KeStartPanic("Invalid ACPI Revision : %d", rsdp->legacy.revision);
-
-    KernLog("\tACPI Root System Table (OEM %s) Revision %d at %p\n",
-            rsdp->legacy.OEMID,
-            (uint)rsdp->legacy.revision,
-            rsdp->legacy.rsdtAddress
-            );
-
-    AcpiSDHeader = (SDTHeader *)(ulong)rsdp->legacy.rsdtAddress;
-
-    if (rsdp->legacy.revision) {
-        KernLog("\tFound ACPI Extended System Table (OEM %s) Revision %d at %p\n",
-            rsdp->legacy.OEMID,
-            (uint)rsdp->legacy.revision,
-            rsdp->xsdtAddress
-            );
-
-        AcpiSDHeader = (SDTHeader *)rsdp->xsdtAddress;
-    }
-
-    // Map the Table Header
-    for (ulong i = 0; i < (sizeof(AcpiSDHeader)/KPAGESIZE) + 1; i++) {
-
-        MmMapPage((void*)((ulong)(AcpiSDHeader) + i*KPAGESIZE),
-                  (void*)((ulong)(AcpiSDHeader) + i*KPAGESIZE),
-                  PRESENT);
-    }
-
-    return;
-}
-
-RSDPDescriptor *IoFindRSDP()
 {
     char *rsdp = NULL;
 
@@ -141,3 +93,108 @@ RSDPDescriptor *IoFindRSDP()
 
     return NULL;
 }
+
+//
+// R/XSDT Exploration
+//
+static inline void IoInitRXSDT(void)
+{
+    char checksum = 1;
+
+    SDTHeader *rxsdt = AcpiSDT;
+
+    // Map the Table Header
+    for (ulong i = 0; i < (sizeof(SDTHeader)/KPAGESIZE) + 1; i++) {
+        MmMapPage((void*)((ulong)(rxsdt) + i*KPAGESIZE),
+                  (void*)((ulong)(rxsdt) + i*KPAGESIZE),
+                  PRESENT);
+    }
+
+    // Checksum calculation
+    checksum = DoChecksum(rxsdt, (size_t)rxsdt->length,
+                          0,
+                          0
+                          );
+
+    if (checksum)
+        KeStartPanic("Invalid RSDT checksum : %d vs 0", checksum);
+
+    if (IoACPIVersion == 1) {
+        KernLog("\tACPI Root System Table %s (%s) length %d [%p]\n",
+            rxsdt->signature,
+            rxsdt->OEMID,
+            rxsdt->length,
+            rxsdt
+            );
+    } else {
+        KernLog("\tACPI Extended System Table %s (%s) length %d [%p]\n",
+            rxsdt->signature,
+            rxsdt->OEMID,
+            rxsdt->length,
+            rxsdt
+            );
+    }
+}
+
+//
+// RSDP Exploration
+//
+static inline void IoInitRSDP(void)
+{
+    char checksum = 1;
+
+    RSDPDescriptor *rsdp = IoFindRSDP();
+    if (!rsdp)
+        KeStartPanic("ACPI RSDP not found in memory");
+
+    // Checksum calculation
+    checksum = DoChecksum(rsdp, (size_t)sizeof(RSDPDescriptor),
+                          (size_t)sizeof(struct RSDPLegacy),
+                          !rsdp->legacy.revision
+                          );
+
+    if (checksum)
+        KeStartPanic("Invalid RSDP checksum : %d vs 0", checksum);
+
+    if (rsdp->legacy.revision == 1 || rsdp->legacy.revision >= 3)
+        KeStartPanic("Invalid ACPI Revision : %d", rsdp->legacy.revision);
+
+    KernLog("\tACPI Revision %d (OEM %s)\n",
+            (uint)rsdp->legacy.revision,
+            rsdp->legacy.OEMID
+            );
+
+    AcpiSDT = (void *)(ulong)rsdp->legacy.rsdtAddress;
+
+    if (rsdp->legacy.revision) {
+        AcpiSDT = (void *)rsdp->xsdtAddress;
+        IoACPIVersion = 2;
+    }
+}
+
+//
+// Explore all ACPI Tables
+//
+static inline void IoSearchAcpiTables(void)
+{
+    return;
+}
+
+
+//
+// Initialise the ACPI by finding tables
+//
+void IoInitAcpi(void)
+{
+    if (BtFirmwareInfo.romValid)
+        KernLog("\tRom Table is valid at %p\n", BtFirmwareInfo.romTable);
+
+    if (BtFirmwareInfo.apmValid)
+        KernLog("\tApm Table is valid at %p\n", BtFirmwareInfo.apmTable);
+
+    // FIND RSDP
+
+    IoInitRSDP();
+
+    IoInitRXSDT();
+}