Merge pull request #4 from rebovas/acpi_classes

Implementation ACPI tables through classes

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/acpi/acpi.cpp b/drivers/acpi/acpi.cpp
new file mode 100644
index 0000000..25dad9d
--- /dev/null
+++ b/drivers/acpi/acpi.cpp
@@ -0,0 +1,61 @@
+#include "acpi.h"
+
+
+const char *Rsdp::signatureString = "RSD PTR ";
+const uint8 Rsdp::validFieldRevision = 2;
+const memAddr Rsdp::romAreaStart = 0xe0000;
+const memAddr Rsdp::romAreaEnd = 0xfffff;
+const memAddr Rsdp::ebdaAreaStart = 0x80000;
+const memAddr Rsdp::ebdaAreaEnd = 0x803ff;
+const uint8 Rsdp::checksunFieldSize = 20;
+// Entry **Rsdt::entries = nullptr;
+
+Rsdt *Rsdp::getRsdt() const
+{
+    Rsdt *rsdtPtr = (Rsdt *)(rsdtAddress);
+    if(rsdtPtr == nullptr or checksumCheck()) return nullptr;
+    else return rsdtPtr;
+};
+
+Xsdt *Rsdp::getXsdt() const
+{
+    Xsdt *xsdtPtr = (Xsdt *)(xsdtAddress);
+    if(xsdtPtr == nullptr or checksumCheck()) return nullptr;
+    else return xsdtPtr;
+};
+
+
+const uint32 DescHeader::getLength() const
+{
+    return length;
+};
+
+const Entry *Rsdt::getEntry(uint8 index)
+{
+    uint32 entriesAmount = (header.getLength() - sizeof(DescHeader)) / Entry::size;
+
+    if(index >= entriesAmount 
+        or entries == nullptr 
+        or header.checksumCheck()) return nullptr;
+    else return ((const Entry **)&entries)[index];
+};
+
+uint8 Rsdp::checksumCheck() const
+{
+    uint8 check = 0;
+    for(uint32 offset = 0; offset < checksunFieldSize; offset++)
+    {
+        check += *(uint8 *)((memAddr)this + offset);
+    }
+    return check;
+};
+
+uint8 DescHeader::checksumCheck() const
+{
+    uint8 check = 0;
+    for(uint32 offset = 0; offset < length; offset++)
+    {
+        check += *(uint8 *)((memAddr)this + offset);
+    }
+    return check;
+};