mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-29 12:35:53 +01:00
70 lines
1.6 KiB
NASM
70 lines
1.6 KiB
NASM
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;------------------------------------------------------------------------------
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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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;
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; 0xffffffe0
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;
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DD 0, 0, 0
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;
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; The VTF signature (0xffffffec)
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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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