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00b8bf7eda
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2776 Add a vector at 0xFF000 (0xFFFFF000) that can be used by Init-SIPI-SIPI to start an AP before memory is initialized. This vector jumps into the same SEC entry point as the ordinary reset vector, with a special value of "AP" in the DI register. The platform-specific SEC code is expected to check for that value and take a different path for APs, if this feature is supported by the platform. Reviewed-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Deric Cole <deric.cole@intel.com>
115 lines
2.7 KiB
Plaintext
115 lines
2.7 KiB
Plaintext
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2014, 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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; Module Name:
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;
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; ResetVec.nasmb
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;
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; Abstract:
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;
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; Reset Vector Data structure
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; This structure is located at 0xFFFFF000
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;
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;------------------------------------------------------------------------------
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; .stack 0x0
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; SECTION .text
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USE16
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;
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; The layout of this file is fixed. The build tool makes assumption of the layout.
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;
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ORG 0h
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;
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; 0xFFFFF000
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;
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; We enter here with CS:IP = 0xFF00:0x0000. Do a far-jump to change CS to 0xF000
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; and IP to ApStartup.
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;
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ApVector:
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mov di, "AP"
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jmp 0xF000:0xF000+ApStartup
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TIMES 0xFC0-($-$$) nop
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;
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; This should be at 0xFFFFFFC0
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;
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;
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; Reserved
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;
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ReservedData: DD 0eeeeeeeeh, 0eeeeeeeeh
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TIMES 0xFD0-($-$$) nop
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;
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; This is located at 0xFFFFFFD0
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;
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mov di, "PA"
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jmp ApStartup
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TIMES 0xFE0-($-$$) nop
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;
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; Pointer to the entry point of the PEI core
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; It is located at 0xFFFFFFE0, and is fixed up by some build tool
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; So if the value 8..1 appears in the final FD image, tool failure occurs.
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;
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PeiCoreEntryPoint: DD 87654321h
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;
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; This is the handler for all kinds of exceptions. Since it's for debugging
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; purpose only, nothing except a dead loop would be done here. Developers could
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; analyze the cause of the exception if a debugger had been attached.
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;
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global ASM_PFX(InterruptHandler)
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ASM_PFX(InterruptHandler):
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jmp $
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iret
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TIMES 0xFF0-($-$$) nop
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;
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; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte
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; Execution starts here upon power-on/platform-reset.
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;
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ResetHandler:
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nop
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nop
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ApStartup:
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;
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; Jmp Rel16 instruction
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; Use machine code directly in case of the assembler optimization
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; SEC entry point relative address will be fixed up by some build tool.
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;
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; Typically, SEC entry point is the function _ModuleEntryPoint() defined in
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; SecEntry.asm
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;
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DB 0e9h
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DW -3
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TIMES 0xFF8-($-$$) nop
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;
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; Ap reset vector segment address is at 0xFFFFFFF8
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; This will be fixed up by some build tool,
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; so if the value 1..8 appears in the final FD image,
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; tool failure occurs
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;
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ApSegAddress: dd 12345678h
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TIMES 0xFFC-($-$$) nop
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;
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; BFV Base is at 0xFFFFFFFC
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; This will be fixed up by some build tool,
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; so if the value 1..8 appears in the final FD image,
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; tool failure occurs.
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;
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BfvBase: DD 12345678h
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;
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; Nothing can go here, otherwise the layout of this file would change.
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;
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