2 files changed, 224 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;
+};
diff --git a/drivers/acpi/acpi.h b/drivers/acpi/acpi.h
new file mode 100644
index 0000000..069c954
--- /dev/null
+++ b/drivers/acpi/acpi.h
@@ -0,0 +1,163 @@
+#include <types.h>
+#include <StringOperations.h>
+
+
+typedef decltype(nullptr) nulltype;
+
+class Gas
+{
+    private:
+        const uint8 addressSpaceId;
+        const uint8 registerBitWidth;
+        const uint8 registerBitOffset;
+        const uint8 accessSize;
+        const uint64 address;
+    public:
+        Gas();
+        Gas(const Gas &) = default;
+};
+
+class DescHeader
+{
+    private:
+        const char signature[4];
+        const uint32 length;
+        const uint8 revision;
+        const uint8 checksum;
+        const char oemId[6];
+        const uint64 oemTableId;
+        const uint32 oemRevision;
+        const uint32 creatorId;
+        const uint32 creatorRevision;
+    public:
+        DescHeader() = delete;
+        DescHeader(const DescHeader &) = delete;
+        const uint32 getLength() const;
+        uint8 checksumCheck() const;
+} __attribute__((packed));
+
+
+class Entry
+{
+    public:
+        // In bytes
+        static const uint8 size = 4;
+    protected:
+        const DescHeader header;
+    public:
+        Entry() = delete;
+        Entry(const Entry &) = delete;
+} __attribute__((packed));
+
+class FadtEntry : public Entry
+{
+    private:
+        const uint32 firmwareCtrl;
+        const uint32 dsdt;
+        const uint8 reserved;
+        const uint8 preferredPmProfile;
+        const uint16 sciInt;
+        const uint32 smiCmd;
+        const uint8 acpiEnable;
+        const uint8 acpiDisable;
+        const uint8 s4biosReq;
+        const uint8 pstateCnt;
+        const uint32 pm1AEvtBlk;
+        const uint32 pm1BEvtBlk;
+        const uint32 pm1ACntBlk;
+        const uint32 pm1BCntBlk;
+        const uint32 pm2CntBlk;
+        const uint32 pmTmrBlk;
+        const uint32 gpe0Blk;
+        const uint32 gpe1Blk;
+        const uint8 pm1EvtLen;
+        const uint8 pm1CntLen;
+        const uint8 pm2CntLen;
+        const uint8 pmTmrLen;
+        const uint8 gpe0BlkLen;
+        const uint8 gpe1BlkLen;
+        const uint8 gpe1Base;
+        const uint8 cstCnt;
+        const uint16 pLvl2Lat;
+        const uint16 pLvl3Lat;
+        const uint16 flushSize;
+        const uint16 flushStride;
+        const uint8 dutyOffset;
+        const uint8 dutyWidth;
+        const uint8 dayAlrm;
+        const uint8 monAlrm;
+        const uint8 century;
+        const uint16 iapcBootArch;
+        const uint8 reservedTwo;
+        const uint32 flags;
+        const Gas resetReg;
+        const uint8 resetValue;
+        const uint16 armBootArch;
+        const uint8 minorRevision;
+        const uint64 xFirmwareCtrl;
+        const uint64 xDsdt;
+        const Gas xPm1AEvtBlk;
+        const Gas xPm1BEvtBlk;
+        const Gas xPm1ACntBlk;
+        const Gas xPm1BCntBlk;
+        const Gas xPm2CntBlk;
+        const Gas xPmTmrBlk;
+        const Gas xGpe0Blk;
+        const Gas xGpe1Blk;
+        const Gas sleepControlReg;
+        const Gas sleepStatusReg;
+        const uint64 hypervisorVendorIdentity;
+    public:
+        FadtEntry() = delete;
+        FadtEntry(const FadtEntry &) = delete;
+} __attribute__((packed));
+
+class Rsdt
+{
+    private:
+        const DescHeader header;
+        const Entry **entries;
+    public:
+        Rsdt() = delete;
+        Rsdt(const Rsdt &) = delete;
+        const Entry *getEntry(uint8 index);
+} __attribute__((packed, aligned(sizeof(uint32))));
+
+class Xsdt
+{
+    private:
+        const DescHeader header;
+        const uint64 firstEntryAddr;
+    public:
+        Xsdt() = delete;
+        Xsdt(const Xsdt &) = delete;
+} __attribute__((packed));
+
+class Rsdp
+{
+    public:
+        const static uint8 validFieldRevision;
+        // RSDP memory address areas in IA-PC systems
+        const static char *signatureString;
+        const static memAddr romAreaStart;
+        const static memAddr romAreaEnd;
+        const static memAddr ebdaAreaStart;
+        const static memAddr ebdaAreaEnd;
+   private:
+        const static uint8 checksunFieldSize;
+        const char signature[8];
+        const uint8 checksum;
+        const char oemId[6];
+        const uint8 revision;
+        const uint32 rsdtAddress;
+        const uint32 length;
+        const uint32 xsdtAddress;
+        const uint8 extendedChecksum;
+        const char reserved[3];
+    public:
+        Rsdp() = delete;
+        Rsdp(const Rsdp &) = delete;
+        Rsdt *getRsdt() const;
+        Xsdt *getXsdt() const;
+        uint8 checksumCheck() const;
+};