mirror of https://github.com/acidanthera/audk.git
292 lines
9.4 KiB
C
292 lines
9.4 KiB
C
/** @file
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The X64 entrypoint is used to process capsule in long mode.
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Copyright (c) 2011 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/CpuExceptionHandlerLib.h>
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#include <Library/DebugAgentLib.h>
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#include "CommonHeader.h"
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#define EXCEPTION_VECTOR_NUMBER 0x22
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#define IA32_PG_P BIT0
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#define IA32_PG_RW BIT1
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#define IA32_PG_PS BIT7
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typedef struct _PAGE_FAULT_CONTEXT {
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BOOLEAN Page1GSupport;
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UINT64 PhyMask;
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UINTN PageFaultBuffer;
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UINTN PageFaultIndex;
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//
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// Store the uplink information for each page being used.
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//
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UINT64 *PageFaultUplink[EXTRA_PAGE_TABLE_PAGES];
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VOID *OriginalHandler;
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} PAGE_FAULT_CONTEXT;
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typedef struct _PAGE_FAULT_IDT_TABLE {
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PAGE_FAULT_CONTEXT PageFaultContext;
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IA32_IDT_GATE_DESCRIPTOR IdtEntryTable[EXCEPTION_VECTOR_NUMBER];
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} PAGE_FAULT_IDT_TABLE;
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/**
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Page fault handler.
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**/
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VOID
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EFIAPI
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PageFaultHandlerHook (
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VOID
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);
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/**
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Hook IDT with our page fault handler so that the on-demand paging works on page fault.
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@param[in, out] IdtEntry Pointer to IDT entry.
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@param[in, out] PageFaultContext Pointer to page fault context.
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**/
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VOID
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HookPageFaultHandler (
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IN OUT IA32_IDT_GATE_DESCRIPTOR *IdtEntry,
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IN OUT PAGE_FAULT_CONTEXT *PageFaultContext
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)
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{
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UINT32 RegEax;
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UINT8 PhysicalAddressBits;
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UINTN PageFaultHandlerHookAddress;
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AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
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if (RegEax >= 0x80000008) {
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AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
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PhysicalAddressBits = (UINT8) RegEax;
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} else {
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PhysicalAddressBits = 36;
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}
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PageFaultContext->PhyMask = LShiftU64 (1, PhysicalAddressBits) - 1;
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PageFaultContext->PhyMask &= (1ull << 48) - SIZE_4KB;
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//
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// Set Page Fault entry to catch >4G access
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//
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PageFaultHandlerHookAddress = (UINTN)PageFaultHandlerHook;
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PageFaultContext->OriginalHandler = (VOID *)(UINTN)(LShiftU64 (IdtEntry->Bits.OffsetUpper, 32) + IdtEntry->Bits.OffsetLow + (IdtEntry->Bits.OffsetHigh << 16));
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IdtEntry->Bits.OffsetLow = (UINT16)PageFaultHandlerHookAddress;
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IdtEntry->Bits.Selector = (UINT16)AsmReadCs ();
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IdtEntry->Bits.Reserved_0 = 0;
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IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
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IdtEntry->Bits.OffsetHigh = (UINT16)(PageFaultHandlerHookAddress >> 16);
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IdtEntry->Bits.OffsetUpper = (UINT32)(PageFaultHandlerHookAddress >> 32);
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IdtEntry->Bits.Reserved_1 = 0;
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if (PageFaultContext->Page1GSupport) {
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PageFaultContext->PageFaultBuffer = (UINTN)(AsmReadCr3 () & PageFaultContext->PhyMask) + EFI_PAGES_TO_SIZE(2);
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}else {
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PageFaultContext->PageFaultBuffer = (UINTN)(AsmReadCr3 () & PageFaultContext->PhyMask) + EFI_PAGES_TO_SIZE(6);
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}
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PageFaultContext->PageFaultIndex = 0;
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ZeroMem (PageFaultContext->PageFaultUplink, sizeof (PageFaultContext->PageFaultUplink));
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}
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/**
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Acquire page for page fault.
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@param[in, out] PageFaultContext Pointer to page fault context.
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@param[in, out] Uplink Pointer to up page table entry.
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**/
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VOID
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AcquirePage (
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IN OUT PAGE_FAULT_CONTEXT *PageFaultContext,
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IN OUT UINT64 *Uplink
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)
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{
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UINTN Address;
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Address = PageFaultContext->PageFaultBuffer + EFI_PAGES_TO_SIZE (PageFaultContext->PageFaultIndex);
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ZeroMem ((VOID *) Address, EFI_PAGES_TO_SIZE (1));
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//
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// Cut the previous uplink if it exists and wasn't overwritten.
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//
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if ((PageFaultContext->PageFaultUplink[PageFaultContext->PageFaultIndex] != NULL) && ((*PageFaultContext->PageFaultUplink[PageFaultContext->PageFaultIndex] & PageFaultContext->PhyMask) == Address)) {
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*PageFaultContext->PageFaultUplink[PageFaultContext->PageFaultIndex] = 0;
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}
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//
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// Link & Record the current uplink.
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//
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*Uplink = Address | IA32_PG_P | IA32_PG_RW;
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PageFaultContext->PageFaultUplink[PageFaultContext->PageFaultIndex] = Uplink;
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PageFaultContext->PageFaultIndex = (PageFaultContext->PageFaultIndex + 1) % EXTRA_PAGE_TABLE_PAGES;
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}
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/**
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The page fault handler that on-demand read >4G memory/MMIO.
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@retval NULL The page fault is correctly handled.
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@retval OriginalHandler The page fault is not handled and is passed through to original handler.
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**/
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VOID *
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EFIAPI
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PageFaultHandler (
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VOID
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)
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{
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IA32_DESCRIPTOR Idtr;
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PAGE_FAULT_CONTEXT *PageFaultContext;
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UINT64 PhyMask;
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UINT64 *PageTable;
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UINT64 PFAddress;
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UINTN PTIndex;
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//
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// Get the IDT Descriptor.
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//
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AsmReadIdtr ((IA32_DESCRIPTOR *) &Idtr);
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//
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// Then get page fault context by IDT Descriptor.
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//
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PageFaultContext = (PAGE_FAULT_CONTEXT *) (UINTN) (Idtr.Base - sizeof (PAGE_FAULT_CONTEXT));
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PhyMask = PageFaultContext->PhyMask;
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PFAddress = AsmReadCr2 ();
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DEBUG ((EFI_D_ERROR, "CapsuleX64 - PageFaultHandler: Cr2 - %lx\n", PFAddress));
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if (PFAddress >= PhyMask + SIZE_4KB) {
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return PageFaultContext->OriginalHandler;
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}
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PFAddress &= PhyMask;
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PageTable = (UINT64*)(UINTN)(AsmReadCr3 () & PhyMask);
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PTIndex = BitFieldRead64 (PFAddress, 39, 47);
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// PML4E
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if ((PageTable[PTIndex] & IA32_PG_P) == 0) {
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AcquirePage (PageFaultContext, &PageTable[PTIndex]);
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}
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PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PhyMask);
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PTIndex = BitFieldRead64 (PFAddress, 30, 38);
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// PDPTE
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if (PageFaultContext->Page1GSupport) {
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PageTable[PTIndex] = (PFAddress & ~((1ull << 30) - 1)) | IA32_PG_P | IA32_PG_RW | IA32_PG_PS;
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} else {
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if ((PageTable[PTIndex] & IA32_PG_P) == 0) {
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AcquirePage (PageFaultContext, &PageTable[PTIndex]);
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}
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PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PhyMask);
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PTIndex = BitFieldRead64 (PFAddress, 21, 29);
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// PD
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PageTable[PTIndex] = (PFAddress & ~((1ull << 21) - 1)) | IA32_PG_P | IA32_PG_RW | IA32_PG_PS;
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}
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return NULL;
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}
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/**
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The X64 entrypoint is used to process capsule in long mode then
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return to 32-bit protected mode.
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@param EntrypointContext Pointer to the context of long mode.
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@param ReturnContext Pointer to the context of 32-bit protected mode.
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@retval This function should never return actually.
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**/
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EFI_STATUS
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EFIAPI
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_ModuleEntryPoint (
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SWITCH_32_TO_64_CONTEXT *EntrypointContext,
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SWITCH_64_TO_32_CONTEXT *ReturnContext
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)
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{
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EFI_STATUS Status;
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IA32_DESCRIPTOR Ia32Idtr;
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IA32_DESCRIPTOR X64Idtr;
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PAGE_FAULT_IDT_TABLE PageFaultIdtTable;
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IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
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//
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// Save the IA32 IDT Descriptor
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//
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AsmReadIdtr ((IA32_DESCRIPTOR *) &Ia32Idtr);
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//
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// Setup X64 IDT table
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//
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ZeroMem (PageFaultIdtTable.IdtEntryTable, sizeof (IA32_IDT_GATE_DESCRIPTOR) * EXCEPTION_VECTOR_NUMBER);
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X64Idtr.Base = (UINTN) PageFaultIdtTable.IdtEntryTable;
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X64Idtr.Limit = (UINT16) (sizeof (IA32_IDT_GATE_DESCRIPTOR) * EXCEPTION_VECTOR_NUMBER - 1);
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AsmWriteIdtr ((IA32_DESCRIPTOR *) &X64Idtr);
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//
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// Setup the default CPU exception handlers
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//
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Status = InitializeCpuExceptionHandlers (NULL);
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ASSERT_EFI_ERROR (Status);
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//
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// Hook page fault handler to handle >4G request.
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//
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PageFaultIdtTable.PageFaultContext.Page1GSupport = EntrypointContext->Page1GSupport;
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IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *) (X64Idtr.Base + (14 * sizeof (IA32_IDT_GATE_DESCRIPTOR)));
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HookPageFaultHandler (IdtEntry, &(PageFaultIdtTable.PageFaultContext));
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//
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// Initialize Debug Agent to support source level debug
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//
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InitializeDebugAgent (DEBUG_AGENT_INIT_THUNK_PEI_IA32TOX64, (VOID *) &Ia32Idtr, NULL);
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//
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// Call CapsuleDataCoalesce to process capsule.
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//
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Status = CapsuleDataCoalesce (
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NULL,
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(EFI_PHYSICAL_ADDRESS *) (UINTN) EntrypointContext->BlockListAddr,
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(VOID **) (UINTN) EntrypointContext->MemoryBase64Ptr,
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(UINTN *) (UINTN) EntrypointContext->MemorySize64Ptr
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);
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ReturnContext->ReturnStatus = Status;
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//
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// Disable interrupt of Debug timer, since the new IDT table cannot work in long mode
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//
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SaveAndSetDebugTimerInterrupt (FALSE);
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//
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// Restore IA32 IDT table
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//
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AsmWriteIdtr ((IA32_DESCRIPTOR *) &Ia32Idtr);
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//
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// Finish to coalesce capsule, and return to 32-bit mode.
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//
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AsmDisablePaging64 (
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ReturnContext->ReturnCs,
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(UINT32) ReturnContext->ReturnEntryPoint,
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(UINT32) (UINTN) EntrypointContext,
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(UINT32) (UINTN) ReturnContext,
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(UINT32) (EntrypointContext->StackBufferBase + EntrypointContext->StackBufferLength)
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);
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//
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// Should never be here.
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//
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ASSERT (FALSE);
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return EFI_SUCCESS;
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} |