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UefiCpuPkg/SecCore: Add pre-memory AP vector 

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>
This commit is contained in:
Cole, Deric 2020-06-02 06:32:25 +08:00 committed by mergify[bot]
parent 322969adf1
commit 00b8bf7eda
1 changed files with 24 additions and 7 deletions
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31
UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb
View File

@ -10,7 +10,7 @@
; Abstract: ; Abstract:
; ;
; Reset Vector Data structure ; Reset Vector Data structure
; This structure is located at 0xFFFFFFC0 ; This structure is located at 0xFFFFF000
; ;
;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------
@ -23,19 +23,36 @@ USE16
; ;
ORG 0h ORG 0h
;
; 0xFFFFF000
;
; We enter here with CS:IP = 0xFF00:0x0000. Do a far-jump to change CS to 0xF000
; and IP to ApStartup.
;
ApVector:
mov di, "AP"
jmp 0xF000:0xF000+ApStartup
TIMES 0xFC0-($-$$) nop
;
; This should be at 0xFFFFFFC0
;
; ;
; Reserved ; Reserved
; ;
ReservedData: DD 0eeeeeeeeh, 0eeeeeeeeh ReservedData: DD 0eeeeeeeeh, 0eeeeeeeeh
TIMES 0x10-($-$$) DB 0 TIMES 0xFD0-($-$$) nop
; ;
; This is located at 0xFFFFFFD0h ; This is located at 0xFFFFFFD0
; ;
mov di, "PA" mov di, "PA"
jmp ApStartup jmp ApStartup
TIMES 0x20-($-$$) DB 0 TIMES 0xFE0-($-$$) nop
; ;
; Pointer to the entry point of the PEI core ; Pointer to the entry point of the PEI core
; It is located at 0xFFFFFFE0, and is fixed up by some build tool ; It is located at 0xFFFFFFE0, and is fixed up by some build tool
@ -53,7 +70,7 @@ ASM_PFX(InterruptHandler):
jmp $ jmp $
iret iret
TIMES 0x30-($-$$) DB 0 TIMES 0xFF0-($-$$) nop
; ;
; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte ; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte
; Execution starts here upon power-on/platform-reset. ; Execution starts here upon power-on/platform-reset.
@ -74,7 +91,7 @@ ApStartup:
DW -3 DW -3
TIMES 0x38-($-$$) DB 0 TIMES 0xFF8-($-$$) nop
; ;
; Ap reset vector segment address is at 0xFFFFFFF8 ; Ap reset vector segment address is at 0xFFFFFFF8
; This will be fixed up by some build tool, ; This will be fixed up by some build tool,
@ -83,7 +100,7 @@ ApStartup:
; ;
ApSegAddress: dd 12345678h ApSegAddress: dd 12345678h
TIMES 0x3c-($-$$) DB 0 TIMES 0xFFC-($-$$) nop
; ;
; BFV Base is at 0xFFFFFFFC ; BFV Base is at 0xFFFFFFFC
; This will be fixed up by some build tool, ; This will be fixed up by some build tool,