1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
//
// Copyright (c) 2011, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution. The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//
#include <AsmMacroIoLib.h>
#include <Base.h>
#include <Library/PcdLib.h>
#include <AutoGen.h>
INCLUDE AsmMacroIoLib.inc
IMPORT CEntryPoint
IMPORT ArmReadMpidr
IMPORT ArmIsMpCore
EXPORT _ModuleEntryPoint
PRESERVE8
AREA PrePiCoreEntryPoint, CODE, READONLY
StartupAddr DCD CEntryPoint
_ModuleEntryPoint
// Get ID of this CPU in Multicore system
bl ArmReadMpidr
LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
and r5, r0, r1
_SetSVCMode
// Enter SVC mode, Disable FIQ and IRQ
mov r1, #0x13|0x80|0x40
msr CPSR_c, r1
// Check if we can install the stack at the top of the System Memory or if we need
// to install the stacks at the bottom of the Firmware Device (case the FD is located
// at the top of the DRAM)
_SetupStackPosition
// Compute Top of System Memory
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
// Calculate Top of the Firmware Device
LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
add r3, r3, r2 // r4 = FdTop = PcdFdBaseAddress + PcdFdSize
// UEFI Memory Size (stacks are allocated in this region)
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
//
// Reserve the memory for the UEFI region (contain stacks on its top)
//
// Calculate how much space there is between the top of the Firmware and the Top of the System Memory
subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
cmp r0, r4
bge _SetupStack
// Case the top of stacks is the FdBaseAddress
mov r1, r2
_SetupStack
// r1 contains the top of the stack (and the UEFI Memory)
// Calculate the Base of the UEFI Memory
sub r6, r1, r4
_GetStackBase
// Compute Base of Normal stacks for CPU Cores
// Is it MpCore system
bl ArmIsMpCore
cmp r0, #0
// Case it is not an MP Core system. Just setup the primary core
beq _SetupUnicoreStack
_GetStackBaseMpCore
// Stack for the primary core = PrimaryCoreStack
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
sub r7, r1, r2
// Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize
LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)
lsl r2, r2, #2
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
mul r2, r2, r3
sub r7, r7, r2
// The top of the Mpcore Stacks is in r1
// The base of the MpCore Stacks is in r7
// Is it the Primary Core ?
LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
cmp r5, r4
beq _SetupPrimaryCoreStack
_SetupSecondaryCoreStack
// Base of the stack for the secondary cores is in r7
// Get the position of the cores (ClusterId * 4) + CoreId
GetCorePositionInStack(r0, r5, r4)
// The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
add r0, r0, #1
// Get the offset for the Secondary Stack
mul r0, r0, r3
add sp, r7, r0
bne _PrepareArguments
_SetupPrimaryCoreStack
// The top of the Mpcore Stacks is in r1
LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
// The reserved space for global variable must be 8-bytes aligned for pushing
// 64-bit variable on the stack
SetPrimaryStack (r1, r2, r3)
_SetGlobals
// Set all the PrePi global variables to 0
mov r3, sp
mov r2, #0x0
_InitGlobals
cmp r3, r1
beq _PrepareArguments
str r2, [r3], #4
b _InitGlobals
_PrepareArguments
mov r0, r5
mov r1, r6
mov r2, r7
mov r3, sp
// Move sec startup address into a data register
// Ensure we're jumping to FV version of the code (not boot remapped alias)
ldr r4, StartupAddr
// Jump to PrePiCore C code
// r0 = MpId
// r1 = UefiMemoryBase
// r2 = StacksBase
// r3 = GlobalVariableBase
blx r4
_NeverReturn
b _NeverReturn
_SetupUnicoreStack
// The top of the Unicore Stack is in r1
LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)
// Calculate the bottom of the primary stack (StackBase)
sub r7, r1, r3
// The reserved space for global variable must be 8-bytes aligned for pushing
// 64-bit variable on the stack
SetPrimaryStack (r1, r2, r3)
b _SetGlobals
END
|
