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Basic IDT setup in the bootloader

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This commit is contained in:
Rafal Kupiec 2023-01-26 20:14:27 +01:00
parent e94e50b5d9
commit bf141fe25e
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
4 changed files with 111 additions and 18 deletions
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59
xtldr/modules/xtos/amd64/cpu.c
View File

@ -99,6 +99,9 @@ XtpInitializeGdtEntry(IN PKGDTENTRY Gdt,
* @param Gdt
* Supplies a pointer to memory area containing GDT to fill in.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to fill in.
*
* @return This routine returns a status code.
*
* @since XT 1.0
@ -107,11 +110,14 @@ XTCDECL
EFI_STATUS
XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt)
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt)
{
EFI_PHYSICAL_ADDRESS GdtAddress, TssAddress;
EFI_PHYSICAL_ADDRESS GdtAddress, IdtAddress, TssAddress;
KDESCRIPTOR OriginalIdt;
PKTSS PhysicalTss, Tss;
PKGDTENTRY GdtEntry;
PKIDTENTRY IdtEntry;
EFI_STATUS Status;
/* Print debug message */
@ -175,6 +181,33 @@ XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
/* Set next valid virtual address */
*VirtualAddress += (EFI_SIZE_TO_PAGES(128 * sizeof(KGDTENTRY)) * EFI_PAGE_SIZE);
/* Print debug message */
XtLdrProtocol->DbgPrint(L"Initializing Interrupt Descriptor Table (IDT)\n");
/* Allocate memory for IDT */
Status = XtLdrProtocol->AllocatePages(EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)), &IdtAddress);
if (Status != STATUS_EFI_SUCCESS) {
/* Memory allocation failure */
XtLdrProtocol->DbgPrint(L"Failed to allocate pages for IDT (Status Code: %lx)\n", Status);
return Status;
}
/* Set IDT entry and fill it with zeroes */
IdtEntry = (PKIDTENTRY)(UINT_PTR)IdtAddress;
RtlZeroMemory(IdtEntry, EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)) * EFI_PAGE_SIZE);
/* Stores IDT register into new IDT entry */
HlStoreInterruptDescriptorTable(&OriginalIdt.Limit);
RtlCopyMemory(IdtEntry, OriginalIdt.Base, OriginalIdt.Limit + 1);
/* Map IDT and set its virtual address */
Status = XtLdrProtocol->AddVirtualMemoryMapping(MemoryMappings, *VirtualAddress, IdtEntry,
EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)), LoaderMemoryData);
*Idt = (PKIDTENTRY)*VirtualAddress;
/* Set next valid virtual address */
*VirtualAddress += (EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)) * EFI_PAGE_SIZE);
/* Return success */
return STATUS_EFI_SUCCESS;
}
@ -185,21 +218,29 @@ XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
* @param Gdt
* Supplies a pointer to memory area containing GDT to load.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to load.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTCDECL
VOID
XtpLoadProcessorContext(IN PKGDTENTRY Gdt)
XtpLoadProcessorContext(IN PKGDTENTRY Gdt,
IN PKIDTENTRY Idt)
{
KDESCRIPTOR GdtDescriptor;
KDESCRIPTOR GdtDescriptor, IdtDescriptor;
GdtDescriptor.Base = Gdt;
GdtDescriptor.Limit = 128 * sizeof(KGDTENTRY) - 1;
/* Load GDT and TSS */
IdtDescriptor.Base = Idt;
IdtDescriptor.Limit = 256 * sizeof(KIDTENTRY) - 1;
/* Load GDT, IDT and TSS */
HlLoadGlobalDescriptorTable(&GdtDescriptor.Limit);
HlLoadInterruptDescriptorTable(&IdtDescriptor.Limit);
HlLoadTaskRegister((UINT32)KGDT_SYS_TSS);
/* Re-enable IDE interrupts */
@ -219,6 +260,9 @@ XtpLoadProcessorContext(IN PKGDTENTRY Gdt)
* @param Gdt
* Supplies a pointer to memory area containing GDT to fill in.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to fill in.
*
* @return This routine returns a status code.
*
* @since XT 1.0
@ -227,7 +271,8 @@ XTCDECL
EFI_STATUS
XtpSetProcessorContext(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt)
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt)
{
EFI_STATUS Status;
@ -238,7 +283,7 @@ XtpSetProcessorContext(IN PLIST_ENTRY MemoryMappings,
HlClearInterruptFlag();
/* Initialize GDT */
Status = XtpInitializeDescriptors(MemoryMappings, VirtualAddress, Gdt);
Status = XtpInitializeDescriptors(MemoryMappings, VirtualAddress, Gdt, Idt);
if(Status != STATUS_EFI_SUCCESS)
{
/* GDT initialization failure */

56
xtldr/modules/xtos/i686/cpu.c
View File

@ -98,6 +98,9 @@ XtpInitializeGdtEntry(IN PKGDTENTRY Gdt,
* @param Gdt
* Supplies a pointer to memory area containing GDT to fill in.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to fill in.
*
* @return This routine returns a status code.
*
* @since XT 1.0
@ -106,12 +109,15 @@ XTCDECL
EFI_STATUS
XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt)
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt)
{
EFI_PHYSICAL_ADDRESS GdtAddress, PcrAddress, TssAddress;
EFI_PHYSICAL_ADDRESS GdtAddress, IdtAddress, PcrAddress, TssAddress;
KDESCRIPTOR OriginalIdt;
PKTSS PhysicalTss, Tss;
PVOID PhysicalPcr, Pcr;
PKGDTENTRY GdtEntry;
PKIDTENTRY IdtEntry;
EFI_STATUS Status;
/* Print debug message */
@ -199,6 +205,32 @@ XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
/* Set next valid virtual address */
*VirtualAddress += (EFI_SIZE_TO_PAGES(128 * sizeof(KGDTENTRY)) * EFI_PAGE_SIZE);
/* Print debug message */
XtLdrProtocol->DbgPrint(L"Initializing Interrupt Descriptor Table (IDT)\n");
/* Allocate memory for IDT */
Status = XtLdrProtocol->AllocatePages(EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)), &IdtAddress);
if (Status != STATUS_EFI_SUCCESS) {
/* Memory allocation failure */
XtLdrProtocol->DbgPrint(L"Failed to allocate pages for IDT (Status Code: %lx)\n", Status);
return Status;
}
/* Set IDT entry and fill it with zeroes */
IdtEntry = (PKIDTENTRY)(UINT_PTR)IdtAddress;
RtlZeroMemory(IdtEntry, EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)) * EFI_PAGE_SIZE);
/* Stores IDT register into new IDT entry */
HlStoreInterruptDescriptorTable(&OriginalIdt.Limit);
RtlCopyMemory(IdtEntry, OriginalIdt.Base, OriginalIdt.Limit + 1);
/* Map IDT and set its virtual address */
Status = XtLdrProtocol->AddVirtualMemoryMapping(MemoryMappings, *VirtualAddress, IdtEntry,
EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)), LoaderMemoryData);
*Idt = (PKIDTENTRY)*VirtualAddress;
/* Set next valid virtual address */
*VirtualAddress += (EFI_SIZE_TO_PAGES(256 * sizeof(KIDTENTRY)) * EFI_PAGE_SIZE);
/* Return success */
return STATUS_EFI_SUCCESS;
}
@ -209,21 +241,29 @@ XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
* @param Gdt
* Supplies a pointer to memory area containing GDT to load.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to load.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTCDECL
VOID
XtpLoadProcessorContext(IN PKGDTENTRY Gdt)
XtpLoadProcessorContext(IN PKGDTENTRY Gdt,
IN PKIDTENTRY Idt)
{
KDESCRIPTOR GdtDescriptor;
KDESCRIPTOR GdtDescriptor, IdtDescriptor;
GdtDescriptor.Base = (PVOID)(ULONG_PTR)Gdt;
GdtDescriptor.Limit = 128 * sizeof(KGDTENTRY) - 1;
IdtDescriptor.Base = Idt;
IdtDescriptor.Limit = 256 * sizeof(KIDTENTRY) - 1;
/* Load GDT and TSS */
HlLoadGlobalDescriptorTable(&GdtDescriptor.Limit);
HlLoadInterruptDescriptorTable(&IdtDescriptor.Limit);
HlLoadTaskRegister((UINT32)KGDT_SYS_TSS);
/* Load PCR in FS segment */
@ -246,6 +286,9 @@ XtpLoadProcessorContext(IN PKGDTENTRY Gdt)
* @param Gdt
* Supplies a pointer to memory area containing GDT to fill in.
*
* @param Idt
* Supplies a pointer to memory area containing IDT to fill in.
*
* @return This routine returns a status code.
*
* @since XT 1.0
@ -254,7 +297,8 @@ XTCDECL
EFI_STATUS
XtpSetProcessorContext(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt)
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt)
{
EFI_STATUS Status;
@ -265,7 +309,7 @@ XtpSetProcessorContext(IN PLIST_ENTRY MemoryMappings,
HlClearInterruptFlag();
/* Initialize GDT */
Status = XtpInitializeDescriptors(MemoryMappings, VirtualAddress, Gdt);
Status = XtpInitializeDescriptors(MemoryMappings, VirtualAddress, Gdt, Idt);
if(Status != STATUS_EFI_SUCCESS)
{
/* GDT initialization failure */

9
xtldr/modules/xtos/includes/xtos.h
View File

@ -42,7 +42,8 @@ XTCDECL
EFI_STATUS
XtpInitializeDescriptors(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt);
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt);
XTCDECL
EFI_STATUS
@ -59,13 +60,15 @@ XtpLoadModule(IN PEFI_FILE_HANDLE BootDir,
XTCDECL
VOID
XtpLoadProcessorContext(IN PKGDTENTRY Gdt);
XtpLoadProcessorContext(IN PKGDTENTRY Gdt,
IN PKIDTENTRY Idt);
XTCDECL
EFI_STATUS
XtpSetProcessorContext(IN PLIST_ENTRY MemoryMappings,
IN PVOID *VirtualAddress,
OUT PKGDTENTRY *Gdt);
OUT PKGDTENTRY *Gdt,
OUT PKIDTENTRY *Idt);
XTCDECL
EFI_STATUS

5
xtldr/modules/xtos/xtos.c
View File

@ -189,6 +189,7 @@ XtpBootSequence(IN PEFI_FILE_HANDLE BootDir,
ULONG KernelStackPages;
EFI_STATUS Status;
PKGDTENTRY Gdt;
PKIDTENTRY Idt;
/* Initialize XTOS startup sequence */
XtLdrProtocol->DbgPrint(L"Initializing XTOS startup sequence\n");
@ -259,7 +260,7 @@ XtpBootSequence(IN PEFI_FILE_HANDLE BootDir,
VirtualAddress += (KernelStackPages * EFI_PAGE_SIZE);
/* Set processor context */
Status = XtpSetProcessorContext(&MemoryMappings, &VirtualAddress, &Gdt);
Status = XtpSetProcessorContext(&MemoryMappings, &VirtualAddress, &Gdt, &Idt);
if(Status != STATUS_EFI_SUCCESS)
{
/* Failed to set processor context */
@ -278,7 +279,7 @@ XtpBootSequence(IN PEFI_FILE_HANDLE BootDir,
}
/* Load processor context */
XtpLoadProcessorContext(Gdt);
XtpLoadProcessorContext(Gdt, Idt);
/* Call XTOS kernel */
XtLdrProtocol->DbgPrint(L"Booting the XTOS kernel\n");