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|
;------------------------------------------------------------------------------
; @file
; First code executed by processor after resetting.
; Derived from UefiCpuPkg/ResetVector/Vtf0/Ia16/ResetVectorVtf0.asm
;
; Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------
BITS 16
ALIGN 16
;
; Pad the image size to 4k when page tables are in VTF0
;
; If the VTF0 image has page tables built in, then we need to make
; sure the end of VTF0 is 4k above where the page tables end.
;
; This is required so the page tables will be 4k aligned when VTF0 is
; located just below 0x100000000 (4GB) in the firmware device.
;
%ifdef ALIGN_TOP_TO_4K_FOR_PAGING
TIMES (0x1000 - ($ - EndOfPageTables) - 0x20) DB 0
%endif
;
; Padding to ensure first guid starts at 0xffffffd0
;
TIMES (15 - ((guidedStructureEnd - guidedStructureStart + 15) % 16)) DB 0
; GUIDed structure. To traverse this you should first verify the
; presence of the table footer guid
; (96b582de-1fb2-45f7-baea-a366c55a082d) at 0xffffffd0. If that
; is found, the two bytes at 0xffffffce are the entire table length.
;
; The table is composed of structures with the form:
;
; Data (arbitrary bytes identified by guid)
; length from start of data to end of guid (2 bytes)
; guid (16 bytes)
;
; so work back from the footer using the length to traverse until you
; either find the guid you're looking for or run off the beginning of
; the table.
;
guidedStructureStart:
;
; SEV Secret block
;
; This describes the guest ram area where the hypervisor should
; inject the secret. The data format is:
;
; base physical address (32 bit word)
; table length (32 bit word)
;
; GUID (SEV secret block): 4c2eb361-7d9b-4cc3-8081-127c90d3d294
;
sevSecretBlockStart:
DD SEV_LAUNCH_SECRET_BASE
DD SEV_LAUNCH_SECRET_SIZE
DW sevSecretBlockEnd - sevSecretBlockStart
DB 0x61, 0xB3, 0x2E, 0x4C, 0x9B, 0x7D, 0xC3, 0x4C
DB 0x80, 0x81, 0x12, 0x7C, 0x90, 0xD3, 0xD2, 0x94
sevSecretBlockEnd:
;
; SEV-ES Processor Reset support
;
; sevEsResetBlock:
; For the initial boot of an AP under SEV-ES, the "reset" RIP must be
; programmed to the RAM area defined by SEV_ES_AP_RESET_IP. The data
; format is:
;
; IP value [0:15]
; CS segment base [31:16]
;
; GUID (SEV-ES reset block): 00f771de-1a7e-4fcb-890e-68c77e2fb44e
;
; A hypervisor reads the CS segement base and IP value. The CS segment base
; value represents the high order 16-bits of the CS segment base, so the
; hypervisor must left shift the value of the CS segement base by 16 bits to
; form the full CS segment base for the CS segment register. It would then
; program the EIP register with the IP value as read.
;
sevEsResetBlockStart:
DD SEV_ES_AP_RESET_IP
DW sevEsResetBlockEnd - sevEsResetBlockStart
DB 0xDE, 0x71, 0xF7, 0x00, 0x7E, 0x1A, 0xCB, 0x4F
DB 0x89, 0x0E, 0x68, 0xC7, 0x7E, 0x2F, 0xB4, 0x4E
sevEsResetBlockEnd:
;
; Table footer:
;
; length of whole table (16 bit word)
; GUID (table footer): 96b582de-1fb2-45f7-baea-a366c55a082d
;
DW guidedStructureEnd - guidedStructureStart
DB 0xDE, 0x82, 0xB5, 0x96, 0xB2, 0x1F, 0xF7, 0x45
DB 0xBA, 0xEA, 0xA3, 0x66, 0xC5, 0x5A, 0x08, 0x2D
guidedStructureEnd:
ALIGN 16
applicationProcessorEntryPoint:
;
; Application Processors entry point
;
; GenFv generates code aligned on a 4k boundary which will jump to this
; location. (0xffffffe0) This allows the Local APIC Startup IPI to be
; used to wake up the application processors.
;
jmp EarlyApInitReal16
ALIGN 8
DD 0
;
; The VTF signature
;
; VTF-0 means that the VTF (Volume Top File) code does not require
; any fixups.
;
vtfSignature:
DB 'V', 'T', 'F', 0
ALIGN 16
resetVector:
;
; Reset Vector
;
; This is where the processor will begin execution
;
nop
nop
jmp EarlyBspInitReal16
ALIGN 16
fourGigabytes:
|
