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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/** @file DxeExceptionLib.c
LoongArch exception library implemenation for DXE modules.
Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/CpuExceptionHandlerLib.h>
#include <Library/CpuLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/SerialPortLib.h>
#include <Protocol/DebugSupport.h>
#include <Register/LoongArch64/Csr.h>
#include "ExceptionCommon.h"
EFI_EXCEPTION_CALLBACK ExternalInterruptHandler[MAX_LOONGARCH_INTERRUPT + 1] = { 0 };
EFI_EXCEPTION_CALLBACK ExceptionHandler[MAX_LOONGARCH_EXCEPTION + 1] = { 0 };
/**
Registers a function to be called from the processor interrupt or exception handler.
This function registers and enables the handler specified by InterruptHandler for a processor
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
The installed handler is called once for each processor interrupt or exception.
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts
are enabled and FALSE if interrupts are disabled.
@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
when a processor interrupt occurs. If this parameter is NULL, then the handler
will be uninstalled.
@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
previously installed.
@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
previously installed.
@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported.
**/
EFI_STATUS
RegisterCpuInterruptHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
)
{
EFI_EXCEPTION_TYPE ExceptionType;
ExceptionType = InterruptType & CSR_ESTAT_EXC;
if (ExceptionType != 0) {
//
// Exception >>= CSR_ESTAT_EXC_SHIFT, convert to ECODE
//
ExceptionType >>= CSR_ESTAT_EXC_SHIFT;
if (ExceptionType > EXCEPT_LOONGARCH_FPE) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler == NULL) && (ExceptionHandler[InterruptType] == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((InterruptHandler != NULL) && (ExceptionHandler[ExceptionType] != NULL)) {
return EFI_ALREADY_STARTED;
}
ExceptionHandler[ExceptionType] = InterruptHandler;
} else {
//
// Interrupt
//
if (InterruptType > MAX_LOONGARCH_INTERRUPT) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler == NULL) && (ExternalInterruptHandler[InterruptType] == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((InterruptHandler != NULL) && (ExternalInterruptHandler[InterruptType] != NULL)) {
return EFI_ALREADY_STARTED;
}
ExternalInterruptHandler[InterruptType] = InterruptHandler;
}
return EFI_SUCCESS;
}
/**
Common exception handler.
@param ExceptionType Exception type.
@param SystemContext Pointer to EFI_SYSTEM_CONTEXT.
**/
VOID
EFIAPI
CommonExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
EFI_EXCEPTION_TYPE InterruptType;
if (ExceptionType == EXCEPT_LOONGARCH_INT) {
//
// Interrupt
//
InterruptType = GetInterruptType (SystemContext);
if (InterruptType == 0xFF) {
ExceptionType = InterruptType;
} else {
if ((ExternalInterruptHandler != NULL) && (ExternalInterruptHandler[InterruptType] != NULL)) {
ExternalInterruptHandler[InterruptType](InterruptType, SystemContext);
return;
}
}
} else if (ExceptionType == EXCEPT_LOONGARCH_FPD) {
EnableFloatingPointUnits ();
InitializeFloatingPointUnits ();
return;
} else {
//
// Exception
//
ExceptionType >>= CSR_ESTAT_EXC_SHIFT;
if ((ExceptionHandler != NULL) && (ExceptionHandler[ExceptionType] != NULL)) {
ExceptionHandler[ExceptionType](ExceptionType, SystemContext);
return;
}
}
//
// Only the TLB refill exception use the same entry point as normal exceptions.
//
if (CsrRead (LOONGARCH_CSR_TLBRERA) & 0x1) {
ExceptionType = mExceptionKnownNameNum - 1; // Use only to dump the exception context.
}
DefaultExceptionHandler (ExceptionType, SystemContext);
}
/**
Initializes all CPU exceptions entries and provides the default exception handlers.
Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
@param[in] VectorInfo Pointer to reserved vector list.
@retval EFI_SUCCESS CPU Exception Entries have been successfully initialized
with default exception handlers.
@retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
@retval EFI_UNSUPPORTED This function is not supported.
**/
EFI_STATUS
EFIAPI
InitializeCpuExceptionHandlers (
IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL
)
{
return EFI_SUCCESS;
}
/**
Setup separate stacks for certain exception handlers.
If the input Buffer and BufferSize are both NULL, use global variable if possible.
@param[in] Buffer Point to buffer used to separate exception stack.
@param[in, out] BufferSize On input, it indicates the byte size of Buffer.
If the size is not enough, the return status will
be EFI_BUFFER_TOO_SMALL, and output BufferSize
will be the size it needs.
@retval EFI_SUCCESS The stacks are assigned successfully.
@retval EFI_UNSUPPORTED This function is not supported.
@retval EFI_BUFFER_TOO_SMALL This BufferSize is too small.
**/
EFI_STATUS
EFIAPI
InitializeSeparateExceptionStacks (
IN VOID *Buffer,
IN OUT UINTN *BufferSize
)
{
return EFI_SUCCESS;
}
|
