From b28740606a1666f98d71934eae40465dab0815ed Mon Sep 17 00:00:00 2001
From: Adrien Bourmault <neox@os-k.eu>
Date: Tue, 4 Feb 2020 17:23:05 +0100
Subject: [PATCH] Working on ACPI exploration

---
 include/io/acpi.h       |  1 +
 kaleid/kernel/io/acpi.c | 67 ++++++++++++++++++++++++++++++++++-------
 2 files changed, 57 insertions(+), 11 deletions(-)

diff --git a/include/io/acpi.h b/include/io/acpi.h
index 8e0d293..f33bfcb 100644
--- a/include/io/acpi.h
+++ b/include/io/acpi.h
@@ -69,6 +69,7 @@ struct SDTHeader {
   uint OEMRevision;
   uint creatorID;
   uint creatorRevision;
+  uint sdtTablePtr;
 };
 
 //----------------------------------------------------------------------------//
diff --git a/kaleid/kernel/io/acpi.c b/kaleid/kernel/io/acpi.c
index 3cf93b9..c6ba0e1 100644
--- a/kaleid/kernel/io/acpi.c
+++ b/kaleid/kernel/io/acpi.c
@@ -26,6 +26,7 @@
 #include <io/vga.h>
 #include <io/acpi.h>
 #include <mm/paging.h>
+#include <mm/map.h>
 
 SDTHeader *AcpiSDT = NULL;
 SDTHeader *AcpiFADT = NULL;
@@ -33,10 +34,12 @@ SDTHeader *AcpiFADT = NULL;
 char IoACPIVersion = 1;
 int tableCount = 1;
 
+extern MemoryMap_t memoryMap;
+
 //
 // Returns the checksum of the given structure
 //
-static inline char DoChecksum(void *ptr, size_t size,
+static char DoChecksum(const void *ptr, const size_t size,
                          size_t intermediateSize, ulong reason)
 {
     char checksum = 0;
@@ -140,14 +143,7 @@ static inline void IoInitRXSDT(void)
 
     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 calculation */
     checksum = DoChecksum(rxsdt, (size_t)rxsdt->length,
                           0,
                           0
@@ -178,7 +174,31 @@ static inline void IoInitRXSDT(void)
 //
 static inline void IoSearchAcpiTables(void)
 {
-    return;
+    SDTHeader *xrsdt = AcpiSDT;
+    SDTHeader *cur = NULL;
+    SDTHeader *table = NULL;
+    register char checksum;
+    int entries;
+
+    if (IoACPIVersion == 1)
+        entries = (xrsdt->length - sizeof(xrsdt)) / 4;
+    else
+        entries = (xrsdt->length - sizeof(xrsdt)) / 8;
+
+    KernLog("\tACPI detected %d entries\n", entries);
+
+    for (int i = 0; i < entries; i++) {
+
+        cur = (SDTHeader *)((ulong)&(xrsdt->sdtTablePtr));
+        table = &cur[i];
+
+        // Checksum calculation
+        //checksum = DoChecksum(table, (size_t)table->length, 0, 0);
+
+        //KernLog("Checksum : %d\n", (int)checksum);
+
+        KernLog("\tACPI System Table id %s [%p]\n", table->signature, table);
+    }
 }
 
 
@@ -195,9 +215,34 @@ void IoInitAcpi(void)
     if (BtFirmwareInfo.apmValid)
         KernLog("\tApm Table is valid at %p\n", BtFirmwareInfo.apmTable);
 
-    // FIND RSDP
+    // 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
+            for (uint j = 0;
+                 j < (memoryMap.entry[i].length
+                    + ((ulong)memoryMap.entry[i].addr)
+                         - ((ulong)memoryMap.entry[i].addr
+                            & 0xFFFFFFFFFFFFF000))
+                    / KPAGESIZE;
+                 j++) {
+                    MmMapPage(memoryMap.entry[i].addr + KPAGESIZE*j,
+                              memoryMap.entry[i].addr + KPAGESIZE*j,
+                              PRESENT);
+                    //KernLog("ACPI %d ID MAP %p\n", i,
+                    //        memoryMap.entry[i].addr + KPAGESIZE*j);
+                }
+        }
+    }
+
+    // FIND RSDP
     IoInitRSDP();
 
     IoInitRXSDT();
+
+    IoSearchAcpiTables();
 }