b382ede386
To help consolidate OVMF fixed memory uses, we declare this range in MEMFD and thereby move it to 8MB. We also now declare the table range in the FDF to set PCDs. This allows us to ASSERT that CR3 is set as expected in OVMF SEC. OvmfPkgIa32.fdf and OvmfPkgIa32X64.fdf are updated simply for consistency. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15146 6f19259b-4bc3-4df7-8a09-765794883524
94 lines
2.9 KiB
NASM
94 lines
2.9 KiB
NASM
;------------------------------------------------------------------------------
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; @file
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; Sets the CR3 register for 64-bit paging
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;
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; Copyright (c) 2008 - 2013, 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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;
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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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;------------------------------------------------------------------------------
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BITS 32
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%define PAGE_PRESENT 0x01
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%define PAGE_READ_WRITE 0x02
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%define PAGE_USER_SUPERVISOR 0x04
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%define PAGE_WRITE_THROUGH 0x08
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%define PAGE_CACHE_DISABLE 0x010
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%define PAGE_ACCESSED 0x020
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%define PAGE_DIRTY 0x040
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%define PAGE_PAT 0x080
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%define PAGE_GLOBAL 0x0100
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%define PAGE_2M_MBO 0x080
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%define PAGE_2M_PAT 0x01000
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%define PAGE_2M_PDE_ATTR (PAGE_2M_MBO + \
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PAGE_ACCESSED + \
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PAGE_DIRTY + \
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PAGE_READ_WRITE + \
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PAGE_PRESENT)
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%define PAGE_PDP_ATTR (PAGE_ACCESSED + \
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PAGE_READ_WRITE + \
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PAGE_PRESENT)
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;
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; Modified: EAX, ECX
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;
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SetCr3ForPageTables64:
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;
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; For OVMF, build some initial page tables at 0x800000-0x806000.
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;
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; This range should match with PcdOvmfSecPageTablesBase and
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; PcdOvmfSecPageTablesSize which are declared in the FDF files.
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;
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; At the end of PEI, the pages tables will be rebuilt into a
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; more permanent location by DxeIpl.
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;
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mov ecx, 6 * 0x1000 / 4
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xor eax, eax
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clearPageTablesMemoryLoop:
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mov dword[ecx * 4 + 0x800000 - 4], eax
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loop clearPageTablesMemoryLoop
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;
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; Top level Page Directory Pointers (1 * 512GB entry)
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;
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mov dword[0x800000], 0x801000 + PAGE_PDP_ATTR
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;
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; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
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;
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mov dword[0x801000], 0x802000 + PAGE_PDP_ATTR
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mov dword[0x801008], 0x803000 + PAGE_PDP_ATTR
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mov dword[0x801010], 0x804000 + PAGE_PDP_ATTR
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mov dword[0x801018], 0x805000 + PAGE_PDP_ATTR
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;
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; Page Table Entries (2048 * 2MB entries => 4GB)
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;
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mov ecx, 0x800
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pageTableEntriesLoop:
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mov eax, ecx
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dec eax
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shl eax, 21
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add eax, PAGE_2M_PDE_ATTR
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mov [ecx * 8 + 0x802000 - 8], eax
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loop pageTableEntriesLoop
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;
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; Set CR3 now that the paging structures are available
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;
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mov eax, 0x800000
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mov cr3, eax
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OneTimeCallRet SetCr3ForPageTables64
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