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OvmfPkg/Bhyve: detach ResetVector from before the SEV-ES changes
Commits 6995a1b79bab, 8a2732186a53 and 30937f2f98c4 modified all four regular files under "OvmfPkg/ResetVector" with SEV-ES dependencies. These are not relevant for Bhyve. Detach the pre-SEV-ES version of ResetVector for Bhyve. Signed-off-by: Rebecca Cran <rebecca@bsdio.com> Message-Id: <20201112053153.22038-2-rebecca@bsdio.com> Acked-by: Peter Grehan <grehan@freebsd.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Rebecca Cran
mergify[bot]
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662b42db76
commit
cabd0de9f6
149
OvmfPkg/Bhyve/ResetVector/Ia32/PageTables64.asm
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149
OvmfPkg/Bhyve/ResetVector/Ia32/PageTables64.asm
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;------------------------------------------------------------------------------
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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) 2020, Rebecca Cran <rebecca@bsdio.com>
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; Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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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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; Check if Secure Encrypted Virtualization (SEV) feature is enabled
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;
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; If SEV is enabled then EAX will be at least 32
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; If SEV is disabled then EAX will be zero.
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;
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CheckSevFeature:
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; Check if we have a valid (0x8000_001F) CPUID leaf
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mov eax, 0x80000000
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cpuid
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; This check should fail on Intel or Non SEV AMD CPUs. In future if
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; Intel CPUs supports this CPUID leaf then we are guranteed to have exact
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; same bit definition.
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cmp eax, 0x8000001f
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jl NoSev
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; Check for memory encryption feature:
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; CPUID Fn8000_001F[EAX] - Bit 1
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;
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mov eax, 0x8000001f
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cpuid
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bt eax, 1
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jnc NoSev
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; Check if memory encryption is enabled
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; MSR_0xC0010131 - Bit 0 (SEV enabled)
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mov ecx, 0xc0010131
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rdmsr
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bt eax, 0
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jnc NoSev
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; Get pte bit position to enable memory encryption
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; CPUID Fn8000_001F[EBX] - Bits 5:0
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;
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mov eax, ebx
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and eax, 0x3f
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jmp SevExit
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NoSev:
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xor eax, eax
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SevExit:
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OneTimeCallRet CheckSevFeature
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;
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; Modified: EAX, EBX, ECX, EDX
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;
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SetCr3ForPageTables64:
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OneTimeCall CheckSevFeature
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xor edx, edx
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test eax, eax
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jz SevNotActive
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; If SEV is enabled, C-bit is always above 31
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sub eax, 32
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bts edx, eax
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SevNotActive:
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;
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; For OVMF, build some initial page tables at
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; PcdOvmfSecPageTablesBase - (PcdOvmfSecPageTablesBase + 0x6000).
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;
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; This range should match with PcdOvmfSecPageTablesSize which is
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; 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 + PT_ADDR (0) - 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[PT_ADDR (0)], PT_ADDR (0x1000) + PAGE_PDP_ATTR
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mov dword[PT_ADDR (4)], edx
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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[PT_ADDR (0x1000)], PT_ADDR (0x2000) + PAGE_PDP_ATTR
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mov dword[PT_ADDR (0x1004)], edx
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mov dword[PT_ADDR (0x1008)], PT_ADDR (0x3000) + PAGE_PDP_ATTR
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mov dword[PT_ADDR (0x100C)], edx
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mov dword[PT_ADDR (0x1010)], PT_ADDR (0x4000) + PAGE_PDP_ATTR
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mov dword[PT_ADDR (0x1014)], edx
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mov dword[PT_ADDR (0x1018)], PT_ADDR (0x5000) + PAGE_PDP_ATTR
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mov dword[PT_ADDR (0x101C)], edx
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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 + PT_ADDR (0x2000 - 8)], eax
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mov [(ecx * 8 + PT_ADDR (0x2000 - 8)) + 4], edx
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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, PT_ADDR (0)
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mov cr3, eax
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OneTimeCallRet SetCr3ForPageTables64
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38
OvmfPkg/Bhyve/ResetVector/ResetVector.inf
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38
OvmfPkg/Bhyve/ResetVector/ResetVector.inf
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## @file
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# Reset Vector
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#
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# Copyright (c) 2020, Rebecca Cran <rebecca@bsdio.com>
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# Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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##
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[Defines]
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INF_VERSION = 1.29
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BASE_NAME = ResetVector
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FILE_GUID = 1BA0062E-C779-4582-8566-336AE8F78F09
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MODULE_TYPE = SEC
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VERSION_STRING = 1.1
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64
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#
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[Sources]
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ResetVector.nasmb
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[Packages]
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OvmfPkg/OvmfPkg.dec
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MdePkg/MdePkg.dec
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UefiCpuPkg/UefiCpuPkg.dec
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[BuildOptions]
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*_*_IA32_NASMB_FLAGS = -I$(WORKSPACE)/UefiCpuPkg/ResetVector/Vtf0/
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*_*_X64_NASMB_FLAGS = -I$(WORKSPACE)/UefiCpuPkg/ResetVector/Vtf0/
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[Pcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize
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68
OvmfPkg/Bhyve/ResetVector/ResetVector.nasmb
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68
OvmfPkg/Bhyve/ResetVector/ResetVector.nasmb
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;------------------------------------------------------------------------------
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; @file
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; This file includes all other code files to assemble the reset vector code
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;
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; Copyright (c) 2020, Rebecca Cran <rebecca@bsdio.com>.
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; Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;------------------------------------------------------------------------------
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;
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; If neither ARCH_IA32 nor ARCH_X64 are defined, then try to include
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; Base.h to use the C pre-processor to determine the architecture.
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;
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%ifndef ARCH_IA32
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%ifndef ARCH_X64
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#include <Base.h>
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#if defined (MDE_CPU_IA32)
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%define ARCH_IA32
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#elif defined (MDE_CPU_X64)
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%define ARCH_X64
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#endif
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%endif
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%endif
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%ifdef ARCH_IA32
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%ifdef ARCH_X64
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%error "Only one of ARCH_IA32 or ARCH_X64 can be defined."
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%endif
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%elifdef ARCH_X64
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%else
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%error "Either ARCH_IA32 or ARCH_X64 must be defined."
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%endif
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%include "CommonMacros.inc"
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%include "PostCodes.inc"
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%ifdef DEBUG_PORT80
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%include "Port80Debug.asm"
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%elifdef DEBUG_SERIAL
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%include "SerialDebug.asm"
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%else
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%include "DebugDisabled.asm"
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%endif
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%include "Ia32/SearchForBfvBase.asm"
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%include "Ia32/SearchForSecEntry.asm"
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%ifdef ARCH_X64
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#include <AutoGen.h>
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%if (FixedPcdGet32 (PcdOvmfSecPageTablesSize) != 0x6000)
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%error "This implementation inherently depends on PcdOvmfSecPageTablesSize"
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%endif
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%define PT_ADDR(Offset) (FixedPcdGet32 (PcdOvmfSecPageTablesBase) + (Offset))
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%include "Ia32/Flat32ToFlat64.asm"
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%include "Ia32/PageTables64.asm"
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%endif
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%include "Ia16/Real16ToFlat32.asm"
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%include "Ia16/Init16.asm"
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%include "Main.asm"
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%include "Ia16/ResetVectorVtf0.asm"
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