Implementation acpi tables through structs

3 files changed, 172 insertions, 0 deletions

diff --git a/drivers/acpi/acpi.cpp b/drivers/acpi/acpi.cpp
new file mode 100644
index 0000000..41a7aa7
--- /dev/null
+++ b/drivers/acpi/acpi.cpp
@@ -0,0 +1,71 @@
+#include "acpi.h"
+#include "StringOperations.h"
+
+
+Rsdp::Rsdp() : rsdpStruct(nullptr), rsdtObj(nullptr), xsdtObj(nullptr)
+{
+    rsdpStruct = (struct rsdp *)StringOperations::findInMemory(rsdpSign, rsdpRomMemArea);
+
+    if(rsdpStruct == nullptr)
+    {
+        rsdpStruct = (struct rsdp *)StringOperations::findInMemory(rsdpSign, rsdpEbdaMemArea);
+    }
+
+    if(rsdpStruct != nullptr)
+    {
+        rsdtObj = Rsdt(rsdpStruct->rsdtAddress);
+        if(rsdpStruct->revision >= validFieldRevision)
+        {
+            xsdtObj = Xsdt(rsdpStruct->xsdtAddress);
+        }
+    }
+};
+
+const Rsdt *Rsdp::getRsdt() const
+{
+    if(rsdpStruct != nullptr) return &rsdtObj;
+    else return nullptr;
+};
+
+Rsdt::Rsdt(const nulltype null) : entry(null)
+{
+    rsdtStruct = null;
+};
+
+Rsdt::Rsdt(const uint32 addrRsdt) : entry(nullptr)
+{
+    rsdtStruct = (const struct rsdt *)(addrRsdt);
+    if(rsdtStruct != nullptr)
+    {
+        entry = Entry(rsdtStruct->header.length,
+                        (&rsdtStruct->firstEntryAddr));
+    }
+};
+
+const Xsdt *Rsdp::getXsdt() const
+{
+    if(rsdpStruct != nullptr) return &xsdtObj;
+    else return nullptr;
+};
+
+Xsdt::Xsdt(const nulltype null)
+{
+    xsdtStruct = nullptr;
+};
+
+Xsdt::Xsdt(const uint32 xsdt)
+{
+    xsdtStruct = (const struct xsdt *)(xsdt);
+};
+
+Entry::Entry(const uint32 rsdtLength, const uint32 *entryAddress)
+{
+    sizeHeadersInBytes = rsdtLength - sizeof(descHeader);
+    headers = (const struct descHeader **)(entryAddress);
+};
+
+Entry::Entry(const nulltype null)
+{
+    sizeHeadersInBytes = 0;
+    headers = null;
+};
diff --git a/drivers/acpi/acpi.h b/drivers/acpi/acpi.h
new file mode 100644
index 0000000..28221d7
--- /dev/null
+++ b/drivers/acpi/acpi.h
@@ -0,0 +1,101 @@
+#include <types.h>
+#include <StringOperations.h>
+
+
+typedef decltype(nullptr) nulltype;
+
+struct descHeader
+{
+    char signature[4];
+    uint32 length;
+    uint8 revision;
+    uint8 checksum;
+    char oemId[6];
+    uint64 oemTableId;
+    uint32 oemRevision;
+    uint32 creatorId;
+    uint32 creatorRevision;
+} __attribute__((packed));
+
+struct rsdt
+{
+    descHeader header;
+    uint32 firstEntryAddr;
+} __attribute__((packed, aligned(sizeof(uint32))));
+
+struct xsdt
+{
+    descHeader header;
+    uint64 firstEntryAddr;
+} __attribute__((packed, aligned(sizeof(uint32))));
+
+struct rsdp
+{
+    char signature[8];
+    uint8 checksum;
+    char oemId[6];
+    uint8 revision;
+    uint32 rsdtAddress;
+    uint32 length;
+    uint32 xsdtAddress;
+    uint8 extendedChecksum;
+    char reserved[3];
+} __attribute__((packed));
+
+class DescriptorTable
+{
+
+};
+
+class Entry
+{
+    private:
+        uint32 sizeHeadersInBytes;
+        const struct descHeader **headers;
+        // DescriptorTable &tables;
+    public:
+        Entry() = delete;
+        Entry(const uint32 sizeEntriesBytes, const uint32 *entryAddress);
+        Entry(const nulltype null);
+};
+
+class Rsdt
+{
+    private:
+        const struct rsdt* rsdtStruct;
+        Entry entry;
+    public:
+        Rsdt() = delete;
+        Rsdt(const uint32 addr);
+        Rsdt(const nulltype null);
+        const Entry& getEntries();
+};
+
+class Xsdt
+{
+    private:
+        const struct xsdt* xsdtStruct;
+    public:
+        Xsdt() = delete;
+        Xsdt(const uint32 addr);
+        Xsdt(const nulltype null);
+};
+
+class Rsdp
+{
+    private:
+        const uint8 validFieldRevision = 2;
+        // RSDP memory address areas in IA-PC systems
+        const char *rsdpSign = "RSD PTR ";
+        const MemArea rsdpRomMemArea = MemArea(0xe0000, 0xfffff);
+        const MemArea rsdpEbdaMemArea = MemArea(0x80000, 0x803ff);
+
+        const struct rsdp *rsdpStruct;
+        Rsdt rsdtObj;
+        Xsdt xsdtObj;
+    public:
+        Rsdp();
+        const Rsdt *getRsdt() const;
+        const Xsdt *getXsdt() const;
+
+};
diff --git a/drivers/acpi/acpi.h.gch b/drivers/acpi/acpi.h.gch
new file mode 100644
index 0000000..8cbaac5
--- /dev/null
+++ b/drivers/acpi/acpi.h.gch