[ros-diffs] [tkreuzer] 35493: Setup a page for the Idt and a page for the gdt + tss. Setup the newly created gdt accordingly. Set gdtr and idtr.

Author: tkreuzer
Date: Wed Aug 20 17:48:47 2008
New Revision: 35493

URL: http://svn.reactos.org/svn/reactos?rev=35493&view=rev
Log:
Setup a page for the Idt and a page for the gdt + tss. Setup the newly created gdt accordingly. Set gdtr and idtr.

Modified:
    branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/loader.c
    branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/include/arch/amd64/amd64.h

Modified: branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/loader.c
URL: http://svn.reactos.org/svn/reactos/branches/ros-amd64-bringup/reactos/boot/f...
==============================================================================
--- branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/loader.c [iso-8859-1] (original)
+++ branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/loader.c [iso-8859-1] Wed Aug 20 17:48:47 2008
@@ -27,9 +27,11 @@
 /* Page Directory and Tables for non-PAE Systems */
 extern ULONG_PTR NextModuleBase;
 extern ULONG_PTR KernelBase;
+ULONG_PTR GdtBase, IdtBase, TssBase;
 extern ROS_KERNEL_ENTRY_POINT KernelEntryPoint;

PPAGE_DIRECTORY_AMD64 pPML4;
+PVOID pIdt, pGdt;

/* FUNCTIONS *****************************************************************/

@@ -92,6 +94,8 @@
    /* Set the new PML4 */
    __writecr3((ULONGLONG)pPML4);

+	FrLdrSetupGdtIdt();
+
    LoaderBlock.FrLdrDbgPrint = DbgPrint;

//	DumpLoaderBlock();
@@ -220,5 +224,56 @@
    	DbgPrint("Could not map %d kernel pages.\n", KernelPages);
    }

-}
-
+	/* Setup a page for the idt */
+	pIdt = MmAllocateMemoryWithType(PAGE_SIZE, LoaderSpecialMemory);
+	IdtBase = KernelBase + KernelPages * PAGE_SIZE;
+	if (!FrLdrMapSinglePage(IdtBase, (ULONGLONG)pIdt))
+	{
+		DbgPrint("Could not map idt page.\n", KernelPages);
+	}
+
+	/* Setup a page for the gdt & tss */
+	pGdt = MmAllocateMemoryWithType(PAGE_SIZE, LoaderSpecialMemory);
+	GdtBase = IdtBase + PAGE_SIZE;
+	TssBase = GdtBase + 20 * sizeof(ULONG64); // FIXME: don't hardcode
+	if (!FrLdrMapSinglePage(GdtBase, (ULONGLONG)pGdt))
+	{
+		DbgPrint("Could not map idt page.\n", KernelPages);
+	}
+
+
+}
+
+VOID
+FrLdrSetupGdtIdt()
+{
+	PKGDTENTRY64 Entry;
+	KDESCRIPTOR Desc;
+
+	RtlZeroMemory(pGdt, PAGE_SIZE);
+
+	/* Setup KGDT_64_R0_CODE */
+	Entry = KiGetGdtEntry(pGdt, KGDT_64_R0_CODE);
+	*(PULONG64)Entry = 0x0020980000000000ULL;
+
+	/* Setup TSS entry */
+	Entry = KiGetGdtEntry(pGdt, KGDT_TSS);
+	KiInitGdtEntry(Entry, TssBase, I386_TSS, 0);
+
+	/* Setup the gdt descriptor */
+	Desc.Limit = 12 * sizeof(ULONG64) - 1;
+	Desc.Base = (PVOID)GdtBase;
+
+	/* Set the new Gdt */
+	__lgdt(&Desc.Limit);
+	DbgPrint("Gdtr.Base = %p\n", Desc.Base);
+
+	/* Setup the idt descriptor */
+	Desc.Limit = 12 * sizeof(ULONG64) - 1;
+	Desc.Base = (PVOID)IdtBase;
+
+	/* Set the new Idt */
+	__lidt(&Desc.Limit);
+	DbgPrint("Idtr.Base = %p\n", Desc.Base);
+
+}

Modified: branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/include/arch/amd64/amd64.h
URL: http://svn.reactos.org/svn/reactos/branches/ros-amd64-bringup/reactos/boot/f...
==============================================================================
--- branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/include/arch/amd64/amd64.h [iso-8859-1] (original)
+++ branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/include/arch/amd64/amd64.h [iso-8859-1] Wed Aug 20 17:48:47 2008
@@ -51,6 +51,42 @@
     HARDWARE_PTE Pde[512];
 } PAGE_DIRECTORY_AMD64, *PPAGE_DIRECTORY_AMD64;

+VOID
+FORCEINLINE
+__lgdt(void *gdt)
+{
+    asm volatile ("lgdt %0\n" : : "m"(*(short*)gdt));
+}
+
+VOID
+FORCEINLINE
+__lidt(void *idt)
+{
+    asm volatile ("lidt %0\n" : : "m"(*(short*)idt));
+}
+
+PKGDTENTRY64
+FORCEINLINE
+KiGetGdtEntry(PVOID pGdt, USHORT Index)
+{
+    return (PKGDTENTRY64)((ULONG64)pGdt + (Index & ~RPL_MASK));
+}
+
+VOID
+FORCEINLINE
+KiInitGdtEntry(PKGDTENTRY64 Entry, ULONG64 Base, UCHAR Type, UCHAR Dpl)
+{
+    Entry->Bits.Type = Type;
+    Entry->Bits.Present = 1;
+    Entry->Bits.Dpl = Dpl;
+    Entry->BaseLow = (USHORT)(Base & 0xFFFF);
+    Entry->Bytes.BaseMiddle = (UCHAR)(Base >> 16);
+    Entry->Bytes.BaseHigh = (UCHAR)(Base >> 24);
+    Entry->BaseUpper = (ULONG)(Base >> 32);
+}
+
+VOID FrLdrSetupGdtIdt();
+
 #endif

#endif /* __AMD64_AMD64_H_ */