a8c791c15b
Add a new entry point for Xen PVH that enter directly in 32bits.
Information on the expected state of the machine when this entry point
is used can be found at:
https://xenbits.xenproject.org/docs/unstable/misc/pvh.html
Also, compare to the original file [1], the two `nop' of the "resetVector"
entry point are removed. There were introduced by 8332983e2e
("UefiCpuPkg: Replace the un-necessary WBINVD instruction at the reset
vector with two NOPs in VTF0.", 2011-08-04), but don't seems to be
useful. This is the entry point used by HVM guest (hvmloader).
[1] UefiCpuPkg/ResetVector/Vtf0/Ia16/ResetVectorVtf0.asm
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-7-anthony.perard@citrix.com>
80 lines
1.8 KiB
NASM
80 lines
1.8 KiB
NASM
;------------------------------------------------------------------------------
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; @file
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; First code executed by processor after resetting.
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;
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; Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
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; Copyright (c) 2019, Citrix Systems, Inc.
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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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BITS 16
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ALIGN 16
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;
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; Pad the image size to 4k when page tables are in VTF0
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;
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; If the VTF0 image has page tables built in, then we need to make
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; sure the end of VTF0 is 4k above where the page tables end.
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;
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; This is required so the page tables will be 4k aligned when VTF0 is
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; located just below 0x100000000 (4GB) in the firmware device.
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;
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%ifdef ALIGN_TOP_TO_4K_FOR_PAGING
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TIMES (0x1000 - ($ - EndOfPageTables) - (fourGigabytes - xenPVHEntryPoint)) DB 0
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%endif
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BITS 32
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xenPVHEntryPoint:
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;
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; Entry point to use when running as a Xen PVH guest. (0xffffffd0)
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;
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; Description of the expected state of the machine when this entry point is
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; used can be found at:
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; https://xenbits.xenproject.org/docs/unstable/misc/pvh.html
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;
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jmp xenPVHMain
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BITS 16
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ALIGN 16
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applicationProcessorEntryPoint:
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;
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; Application Processors entry point
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;
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; GenFv generates code aligned on a 4k boundary which will jump to this
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; location. (0xffffffe0) This allows the Local APIC Startup IPI to be
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; used to wake up the application processors.
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;
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jmp EarlyApInitReal16
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ALIGN 8
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DD 0
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;
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; The VTF signature
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;
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; VTF-0 means that the VTF (Volume Top File) code does not require
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; any fixups.
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;
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vtfSignature:
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DB 'V', 'T', 'F', 0
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ALIGN 16
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resetVector:
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;
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; Reset Vector
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;
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; This is where the processor will begin execution
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;
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jmp EarlyBspInitReal16
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ALIGN 16
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fourGigabytes:
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