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|
;------------------------------------------------------------------------------ ;
; Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; MpFuncs.nasm
;
; Abstract:
;
; This is the assembly code for Multi-processor S3 support
;
;-------------------------------------------------------------------------------
%define VacantFlag 0x0
%define NotVacantFlag 0xff
%define LockLocation RendezvousFunnelProcEnd - RendezvousFunnelProcStart
%define StackStartAddressLocation LockLocation + 0x8
%define StackSizeLocation LockLocation + 0x10
%define CProcedureLocation LockLocation + 0x18
%define GdtrLocation LockLocation + 0x20
%define IdtrLocation LockLocation + 0x2A
%define BufferStartLocation LockLocation + 0x34
%define Cr3OffsetLocation LockLocation + 0x38
%define InitializeFloatingPointUnitsAddress LockLocation + 0x3C
;-------------------------------------------------------------------------------------
;RendezvousFunnelProc procedure follows. All APs execute their procedure. This
;procedure serializes all the AP processors through an Init sequence. It must be
;noted that APs arrive here very raw...ie: real mode, no stack.
;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC
;IS IN MACHINE CODE.
;-------------------------------------------------------------------------------------
;RendezvousFunnelProc (&WakeUpBuffer,MemAddress);
;text SEGMENT
DEFAULT REL
SECTION .text
BITS 16
global ASM_PFX(RendezvousFunnelProc)
ASM_PFX(RendezvousFunnelProc):
RendezvousFunnelProcStart:
; At this point CS = 0x(vv00) and ip= 0x0.
mov ax, cs
mov ds, ax
mov es, ax
mov ss, ax
xor ax, ax
mov fs, ax
mov gs, ax
flat32Start:
mov si, BufferStartLocation
mov edx,dword [si] ; EDX is keeping the start address of wakeup buffer
mov si, Cr3OffsetLocation
mov ecx,dword [si] ; ECX is keeping the value of CR3
mov si, GdtrLocation
o32 lgdt [cs:si]
mov si, IdtrLocation
o32 lidt [cs:si]
xor ax, ax
mov ds, ax
mov eax, cr0 ; Get control register 0
or eax, 0x000000001 ; Set PE bit (bit #0)
mov cr0, eax
FLAT32_JUMP:
a32 jmp dword 0x20:0x0
BITS 32
PMODE_ENTRY: ; protected mode entry point
mov ax, 0x18
o16 mov ds, ax
o16 mov es, ax
o16 mov fs, ax
o16 mov gs, ax
o16 mov ss, ax ; Flat mode setup.
mov eax, cr4
bts eax, 5
mov cr4, eax
mov cr3, ecx
mov esi, edx ; Save wakeup buffer address
mov ecx, 0xc0000080 ; EFER MSR number.
rdmsr ; Read EFER.
bts eax, 8 ; Set LME=1.
wrmsr ; Write EFER.
mov eax, cr0 ; Read CR0.
bts eax, 31 ; Set PG=1.
mov cr0, eax ; Write CR0.
LONG_JUMP:
a16 jmp dword 0x38:0x0
BITS 64
LongModeStart:
mov ax, 0x30
o16 mov ds, ax
o16 mov es, ax
o16 mov ss, ax
mov edi, esi
add edi, LockLocation
mov al, NotVacantFlag
TestLock:
xchg byte [edi], al
cmp al, NotVacantFlag
jz TestLock
ProgramStack:
mov edi, esi
add edi, StackSizeLocation
mov rax, qword [edi]
mov edi, esi
add edi, StackStartAddressLocation
add rax, qword [edi]
mov rsp, rax
mov qword [edi], rax
Releaselock:
mov al, VacantFlag
mov edi, esi
add edi, LockLocation
xchg byte [edi], al
;
; Call assembly function to initialize FPU.
;
mov rax, qword [esi + InitializeFloatingPointUnitsAddress]
sub rsp, 0x20
call rax
add rsp, 0x20
;
; Call C Function
;
mov edi, esi
add edi, CProcedureLocation
mov rax, qword [edi]
test rax, rax
jz GoToSleep
sub rsp, 0x20
call rax
add rsp, 0x20
GoToSleep:
cli
hlt
jmp $-2
RendezvousFunnelProcEnd:
;-------------------------------------------------------------------------------------
; AsmGetAddressMap (&AddressMap);
;-------------------------------------------------------------------------------------
; comments here for definition of address map
global ASM_PFX(AsmGetAddressMap)
ASM_PFX(AsmGetAddressMap):
lea rax, [RendezvousFunnelProcStart]
mov qword [rcx], rax
mov qword [rcx+0x8], PMODE_ENTRY - RendezvousFunnelProcStart
mov qword [rcx+0x10], FLAT32_JUMP - RendezvousFunnelProcStart
mov qword [rcx+0x18], RendezvousFunnelProcEnd - RendezvousFunnelProcStart
mov qword [rcx+0x20], LongModeStart - RendezvousFunnelProcStart
mov qword [rcx+0x28], LONG_JUMP - RendezvousFunnelProcStart
ret
|
