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| author | Cole, Deric <deric.cole@intel.com> | 2020-06-02 06:32:25 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-06-23 01:50:29 +0000 |
| commit | 00b8bf7eda00fb6f0197d3968b6078cfdb4870fa (patch) | |
| tree | 59a0836388a60dc11ab118550db7226a40000b27 /UefiCpuPkg/SecCore/Ia32 | |
| parent | 322969adf1fb3d6cfbd613f35121315715aff2ed (diff) | |
| download | edk2-00b8bf7eda00fb6f0197d3968b6078cfdb4870fa.tar.gz edk2-00b8bf7eda00fb6f0197d3968b6078cfdb4870fa.tar.bz2 edk2-00b8bf7eda00fb6f0197d3968b6078cfdb4870fa.zip | |
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>
Diffstat (limited to 'UefiCpuPkg/SecCore/Ia32')
| -rw-r--r-- | UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb b/UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb index f41b9669d0..1dfc4efe4c 100644 --- a/UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb +++ b/UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb @@ -10,7 +10,7 @@ ; Abstract:
;
; Reset Vector Data structure
-; This structure is located at 0xFFFFFFC0
+; This structure is located at 0xFFFFF000
;
;------------------------------------------------------------------------------
@@ -23,19 +23,36 @@ USE16 ;
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-($-$$) nop
+
+;
+; This should be at 0xFFFFFFC0
+;
+
;
; Reserved
;
ReservedData: DD 0eeeeeeeeh, 0eeeeeeeeh
- TIMES 0x10-($-$$) DB 0
+ TIMES 0xFD0-($-$$) nop
;
-; This is located at 0xFFFFFFD0h
+; This is located at 0xFFFFFFD0
;
mov di, "PA"
jmp ApStartup
- TIMES 0x20-($-$$) DB 0
+ TIMES 0xFE0-($-$$) nop
;
; Pointer to the entry point of the PEI core
; It is located at 0xFFFFFFE0, and is fixed up by some build tool
@@ -53,7 +70,7 @@ ASM_PFX(InterruptHandler): jmp $
iret
- TIMES 0x30-($-$$) DB 0
+ TIMES 0xFF0-($-$$) nop
;
; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte
; Execution starts here upon power-on/platform-reset.
@@ -74,7 +91,7 @@ ApStartup: DW -3
- TIMES 0x38-($-$$) DB 0
+ TIMES 0xFF8-($-$$) nop
;
; Ap reset vector segment address is at 0xFFFFFFF8
; This will be fixed up by some build tool,
@@ -83,7 +100,7 @@ ApStartup: ;
ApSegAddress: dd 12345678h
- TIMES 0x3c-($-$$) DB 0
+ TIMES 0xFFC-($-$$) nop
;
; BFV Base is at 0xFFFFFFFC
; This will be fixed up by some build tool,
|