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/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
Support.c
Abstract:
Revision History:
--*/
#include "EfiLdr.h"
EFI_STATUS
EfiAddMemoryDescriptor(
UINTN *NoDesc,
EFI_MEMORY_DESCRIPTOR *Desc,
EFI_MEMORY_TYPE Type,
EFI_PHYSICAL_ADDRESS BaseAddress,
UINT64 NoPages,
UINT64 Attribute
)
{
UINTN NumberOfDesc;
UINT64 Temp;
UINTN Index;
if (NoPages == 0) {
return EFI_SUCCESS;
}
//
// See if the new memory descriptor needs to be carved out of an existing memory descriptor
//
NumberOfDesc = *NoDesc;
for (Index = 0; Index < NumberOfDesc; Index++) {
if (Desc[Index].Type == EfiConventionalMemory) {
Temp = DivU64x32 ((BaseAddress - Desc[Index].PhysicalStart), EFI_PAGE_SIZE) + NoPages;
if ((Desc[Index].PhysicalStart < BaseAddress) && (Desc[Index].NumberOfPages >= Temp)) {
if (Desc[Index].NumberOfPages > Temp) {
Desc[*NoDesc].Type = EfiConventionalMemory;
Desc[*NoDesc].PhysicalStart = BaseAddress + MultU64x32 (NoPages, EFI_PAGE_SIZE);
Desc[*NoDesc].NumberOfPages = Desc[Index].NumberOfPages - Temp;
Desc[*NoDesc].VirtualStart = 0;
Desc[*NoDesc].Attribute = Desc[Index].Attribute;
*NoDesc = *NoDesc + 1;
}
Desc[Index].NumberOfPages = Temp - NoPages;
}
if ((Desc[Index].PhysicalStart == BaseAddress) && (Desc[Index].NumberOfPages == NoPages)) {
Desc[Index].Type = Type;
Desc[Index].Attribute = Attribute;
return EFI_SUCCESS;
}
if ((Desc[Index].PhysicalStart == BaseAddress) && (Desc[Index].NumberOfPages > NoPages)) {
Desc[Index].NumberOfPages -= NoPages;
Desc[Index].PhysicalStart += MultU64x32 (NoPages, EFI_PAGE_SIZE);
}
}
}
//
// Add the new memory descriptor
//
Desc[*NoDesc].Type = Type;
Desc[*NoDesc].PhysicalStart = BaseAddress;
Desc[*NoDesc].NumberOfPages = NoPages;
Desc[*NoDesc].VirtualStart = 0;
Desc[*NoDesc].Attribute = Attribute;
*NoDesc = *NoDesc + 1;
return EFI_SUCCESS;
}
UINTN
FindSpace (
UINTN NoPages,
IN UINTN *NumberOfMemoryMapEntries,
IN EFI_MEMORY_DESCRIPTOR *EfiMemoryDescriptor,
EFI_MEMORY_TYPE Type,
UINT64 Attribute
)
{
EFI_PHYSICAL_ADDRESS MaxPhysicalStart;
UINT64 MaxNoPages;
UINTN Index;
EFI_MEMORY_DESCRIPTOR *CurrentMemoryDescriptor;
MaxPhysicalStart = 0;
MaxNoPages = 0;
CurrentMemoryDescriptor = NULL;
for (Index = 0; Index < *NumberOfMemoryMapEntries; Index++) {
if (EfiMemoryDescriptor[Index].PhysicalStart + LShiftU64(EfiMemoryDescriptor[Index].NumberOfPages, EFI_PAGE_SHIFT) <= 0x100000) {
continue;
}
if ((EfiMemoryDescriptor[Index].Type == EfiConventionalMemory) &&
(EfiMemoryDescriptor[Index].NumberOfPages >= NoPages)) {
if (EfiMemoryDescriptor[Index].PhysicalStart > MaxPhysicalStart) {
if (EfiMemoryDescriptor[Index].PhysicalStart + LShiftU64(EfiMemoryDescriptor[Index].NumberOfPages, EFI_PAGE_SHIFT) <= 0x100000000) {
MaxPhysicalStart = EfiMemoryDescriptor[Index].PhysicalStart;
MaxNoPages = EfiMemoryDescriptor[Index].NumberOfPages;
CurrentMemoryDescriptor = &EfiMemoryDescriptor[Index];
}
}
}
if ((EfiMemoryDescriptor[Index].Type == EfiReservedMemoryType) ||
(EfiMemoryDescriptor[Index].Type >= EfiACPIReclaimMemory) ) {
continue;
}
if ((EfiMemoryDescriptor[Index].Type == EfiRuntimeServicesCode) ||
(EfiMemoryDescriptor[Index].Type == EfiRuntimeServicesData)) {
break;
}
}
if (MaxPhysicalStart == 0) {
return 0;
}
if (MaxNoPages != NoPages) {
CurrentMemoryDescriptor->NumberOfPages = MaxNoPages - NoPages;
EfiMemoryDescriptor[*NumberOfMemoryMapEntries].Type = Type;
EfiMemoryDescriptor[*NumberOfMemoryMapEntries].PhysicalStart = MaxPhysicalStart + LShiftU64(MaxNoPages - NoPages, EFI_PAGE_SHIFT);
EfiMemoryDescriptor[*NumberOfMemoryMapEntries].NumberOfPages = NoPages;
EfiMemoryDescriptor[*NumberOfMemoryMapEntries].VirtualStart = 0;
EfiMemoryDescriptor[*NumberOfMemoryMapEntries].Attribute = Attribute;
*NumberOfMemoryMapEntries = *NumberOfMemoryMapEntries + 1;
} else {
CurrentMemoryDescriptor->Type = Type;
CurrentMemoryDescriptor->Attribute = Attribute;
}
return (UINTN)(MaxPhysicalStart + LShiftU64(MaxNoPages - NoPages, EFI_PAGE_SHIFT));
}
VOID
GenMemoryMap (
UINTN *NumberOfMemoryMapEntries,
EFI_MEMORY_DESCRIPTOR *EfiMemoryDescriptor,
BIOS_MEMORY_MAP *BiosMemoryMap
)
{
UINT64 BaseAddress;
UINT64 Length;
EFI_MEMORY_TYPE Type;
UINTN Index;
UINTN Attr;
UINT64 Ceiling;
Ceiling = 0xFFFFFFFF;
for (Index = 0; Index < BiosMemoryMap->MemoryMapSize / sizeof(BIOS_MEMORY_MAP_ENTRY); Index++) {
switch (BiosMemoryMap->MemoryMapEntry[Index].Type) {
case (INT15_E820_AddressRangeMemory):
Type = EfiConventionalMemory;
Attr = EFI_MEMORY_WB;
break;
case (INT15_E820_AddressRangeReserved):
Type = EfiReservedMemoryType;
Attr = EFI_MEMORY_UC;
break;
case (INT15_E820_AddressRangeACPI):
Type = EfiACPIReclaimMemory;
Attr = EFI_MEMORY_WB;
break;
case (INT15_E820_AddressRangeNVS):
Type = EfiACPIMemoryNVS;
Attr = EFI_MEMORY_UC;
break;
default:
// We should not get here, according to ACPI 2.0 Spec.
// BIOS behaviour of the Int15h, E820h
Type = EfiReservedMemoryType;
Attr = EFI_MEMORY_UC;
break;
}
if (Type == EfiConventionalMemory) {
BaseAddress = BiosMemoryMap->MemoryMapEntry[Index].BaseAddress;
Length = BiosMemoryMap->MemoryMapEntry[Index].Length;
if (BaseAddress & EFI_PAGE_MASK) {
Length = Length + (BaseAddress & EFI_PAGE_MASK) - EFI_PAGE_SIZE;
BaseAddress = LShiftU64 (RShiftU64 (BaseAddress, EFI_PAGE_SHIFT) + 1, EFI_PAGE_SHIFT);
}
} else {
BaseAddress = BiosMemoryMap->MemoryMapEntry[Index].BaseAddress;
Length = BiosMemoryMap->MemoryMapEntry[Index].Length + (BaseAddress & EFI_PAGE_MASK);
BaseAddress = LShiftU64 (RShiftU64 (BaseAddress, EFI_PAGE_SHIFT), EFI_PAGE_SHIFT);
if (Length & EFI_PAGE_MASK) {
Length = LShiftU64 (RShiftU64 (Length, EFI_PAGE_SHIFT) + 1, EFI_PAGE_SHIFT);
}
//
// Update Memory Ceiling
//
if ((BaseAddress >= 0x100000) && (BaseAddress < 0x100000000)) {
if (Ceiling > BaseAddress) {
Ceiling = BaseAddress;
}
}
}
EfiAddMemoryDescriptor (
NumberOfMemoryMapEntries,
EfiMemoryDescriptor,
Type,
(EFI_PHYSICAL_ADDRESS)BaseAddress,
RShiftU64 (Length, EFI_PAGE_SHIFT),
Attr
);
}
//
// Update MemoryMap according to Ceiling
//
for (Index = 0; Index < *NumberOfMemoryMapEntries; Index++) {
if ((EfiMemoryDescriptor[Index].Type == EfiConventionalMemory) &&
(EfiMemoryDescriptor[Index].PhysicalStart > 0x100000) &&
(EfiMemoryDescriptor[Index].PhysicalStart < 0x100000000)) {
if (EfiMemoryDescriptor[Index].PhysicalStart >= Ceiling) {
EfiMemoryDescriptor[Index].Type = EfiReservedMemoryType;
}
}
}
}
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