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2ef2b01e | 1 | /** @file\r |
c6a72cd7 | 2 | Basic serial IO abstraction for GDB\r |
2ef2b01e | 3 | \r |
60274cca | 4 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r |
3402aac7 | 5 | \r |
878b807a | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
2ef2b01e A |
7 | \r |
8 | **/\r | |
9 | \r | |
10 | #include <Uefi.h>\r | |
11 | #include <Library/GdbSerialLib.h>\r | |
12 | #include <Library/PcdLib.h>\r | |
13 | #include <Library/IoLib.h>\r | |
14 | #include <Library/DebugLib.h>\r | |
15 | \r | |
16 | \r | |
17 | //---------------------------------------------\r | |
18 | // UART Register Offsets\r | |
19 | //---------------------------------------------\r | |
20 | #define BAUD_LOW_OFFSET 0x00\r | |
21 | #define BAUD_HIGH_OFFSET 0x01\r | |
22 | #define IER_OFFSET 0x01\r | |
23 | #define LCR_SHADOW_OFFSET 0x01\r | |
24 | #define FCR_SHADOW_OFFSET 0x02\r | |
25 | #define IR_CONTROL_OFFSET 0x02\r | |
26 | #define FCR_OFFSET 0x02\r | |
27 | #define EIR_OFFSET 0x02\r | |
28 | #define BSR_OFFSET 0x03\r | |
29 | #define LCR_OFFSET 0x03\r | |
30 | #define MCR_OFFSET 0x04\r | |
31 | #define LSR_OFFSET 0x05\r | |
32 | #define MSR_OFFSET 0x06\r | |
33 | \r | |
34 | //---------------------------------------------\r | |
35 | // UART Register Bit Defines\r | |
36 | //---------------------------------------------\r | |
02ec23ab AB |
37 | #define LSR_TXRDY 0x20U\r |
38 | #define LSR_RXDA 0x01U\r | |
39 | #define DLAB 0x01U\r | |
40 | #define ENABLE_FIFO 0x01U\r | |
41 | #define CLEAR_FIFOS 0x06U\r | |
2ef2b01e A |
42 | \r |
43 | \r | |
44 | \r | |
45 | // IO Port Base for the UART\r | |
46 | UINTN gPort;\r | |
47 | \r | |
48 | \r | |
49 | /**\r | |
50 | The constructor function initializes the UART.\r | |
3402aac7 | 51 | \r |
2ef2b01e A |
52 | @param ImageHandle The firmware allocated handle for the EFI image.\r |
53 | @param SystemTable A pointer to the EFI System Table.\r | |
3402aac7 | 54 | \r |
2ef2b01e A |
55 | @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r |
56 | \r | |
57 | **/\r | |
58 | RETURN_STATUS\r | |
59 | EFIAPI\r | |
60 | GdbSerialLibConstructor (\r | |
61 | IN EFI_HANDLE ImageHandle,\r | |
62 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
63 | )\r | |
64 | {\r | |
65 | UINT64 BaudRate;\r | |
66 | UINT8 DataBits;\r | |
67 | UINT8 Parity;\r | |
68 | UINT8 StopBits;\r | |
3402aac7 | 69 | \r |
2ef2b01e | 70 | gPort = (UINTN)PcdGet32 (PcdGdbUartPort);\r |
3402aac7 | 71 | \r |
2ef2b01e A |
72 | BaudRate = PcdGet64 (PcdGdbBaudRate);\r |
73 | Parity = PcdGet8 (PcdGdbParity);\r | |
74 | DataBits = PcdGet8 (PcdGdbDataBits);\r | |
75 | StopBits = PcdGet8 (PcdGdbStopBits);\r | |
76 | \r | |
77 | return GdbSerialInit (BaudRate, Parity, DataBits, StopBits);\r | |
78 | }\r | |
79 | \r | |
80 | \r | |
81 | \r | |
82 | /**\r | |
c6a72cd7 | 83 | Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,\r |
2ef2b01e A |
84 | data buts, and stop bits on a serial device. This call is optional as the serial\r |
85 | port will be set up with defaults base on PCD values.\r | |
86 | \r | |
87 | @param BaudRate The requested baud rate. A BaudRate value of 0 will use the the\r | |
88 | device's default interface speed.\r | |
89 | @param Parity The type of parity to use on this serial device. A Parity value of\r | |
90 | DefaultParity will use the device's default parity value.\r | |
91 | @param DataBits The number of data bits to use on the serial device. A DataBits\r | |
c6a72cd7 | 92 | value of 0 will use the device's default data bit setting.\r |
2ef2b01e A |
93 | @param StopBits The number of stop bits to use on this serial device. A StopBits\r |
94 | value of DefaultStopBits will use the device's default number of\r | |
95 | stop bits.\r | |
96 | \r | |
97 | @retval EFI_SUCCESS The device was configured.\r | |
c6a72cd7 | 98 | @retval EFI_DEVICE_ERROR The serial device could not be configured.\r |
2ef2b01e A |
99 | \r |
100 | **/\r | |
101 | RETURN_STATUS\r | |
102 | EFIAPI\r | |
103 | GdbSerialInit (\r | |
3402aac7 RC |
104 | IN UINT64 BaudRate,\r |
105 | IN UINT8 Parity,\r | |
106 | IN UINT8 DataBits,\r | |
107 | IN UINT8 StopBits\r | |
2ef2b01e A |
108 | )\r |
109 | {\r | |
110 | UINTN Divisor;\r | |
111 | UINT8 OutputData;\r | |
112 | UINT8 Data;\r | |
113 | UINT8 BreakSet = 0;\r | |
114 | \r | |
115 | //\r | |
116 | // We assume the UART has been turned on to decode gPort address range\r | |
117 | //\r | |
3402aac7 | 118 | \r |
2ef2b01e A |
119 | //\r |
120 | // Map 5..8 to 0..3\r | |
121 | //\r | |
122 | Data = (UINT8) (DataBits - (UINT8)5);\r | |
123 | \r | |
124 | //\r | |
125 | // Calculate divisor for baud generator\r | |
126 | //\r | |
3402aac7 RC |
127 | Divisor = 115200/(UINTN)BaudRate;\r |
128 | \r | |
2ef2b01e A |
129 | //\r |
130 | // Set communications format\r | |
131 | //\r | |
132 | OutputData = (UINT8)((DLAB << 7) | ((BreakSet << 6) | ((Parity << 3) | ((StopBits << 2) | Data))));\r | |
133 | IoWrite8 (gPort + LCR_OFFSET, OutputData);\r | |
134 | \r | |
135 | //\r | |
136 | // Configure baud rate\r | |
137 | //\r | |
138 | IoWrite8 (gPort + BAUD_HIGH_OFFSET, (UINT8)(Divisor >> 8));\r | |
139 | IoWrite8 (gPort + BAUD_LOW_OFFSET, (UINT8)(Divisor & 0xff));\r | |
140 | \r | |
141 | \r | |
142 | //\r | |
143 | // Switch back to bank 0\r | |
144 | //\r | |
145 | OutputData = (UINT8)((~DLAB<<7)|((BreakSet<<6)|((Parity<<3)|((StopBits<<2)| Data))));\r | |
146 | IoWrite8 (gPort + LCR_OFFSET, OutputData);\r | |
147 | \r | |
148 | // Not sure this is the right place to enable the FIFOs....\r | |
149 | // We probably need the FIFO enabled to not drop input\r | |
150 | IoWrite8 (gPort + FCR_SHADOW_OFFSET, ENABLE_FIFO);\r | |
151 | \r | |
152 | \r | |
153 | // Configure the UART hardware here\r | |
154 | return RETURN_SUCCESS;\r | |
155 | }\r | |
156 | \r | |
157 | \r | |
158 | /**\r | |
159 | Check to see if a character is available from GDB. Do not read the character as that is\r | |
160 | done via GdbGetChar().\r | |
161 | \r | |
4f0624e8 GL |
162 | @return TRUE - Character available\r |
163 | @return FALSE - Character not available\r | |
3402aac7 | 164 | \r |
2ef2b01e A |
165 | **/\r |
166 | BOOLEAN\r | |
167 | EFIAPI\r | |
168 | GdbIsCharAvailable (\r | |
169 | VOID\r | |
3402aac7 | 170 | )\r |
2ef2b01e A |
171 | {\r |
172 | UINT8 Data;\r | |
3402aac7 | 173 | \r |
2ef2b01e | 174 | Data = IoRead8 (gPort + LSR_OFFSET);\r |
3402aac7 | 175 | \r |
2ef2b01e A |
176 | return ((Data & LSR_RXDA) == LSR_RXDA);\r |
177 | }\r | |
178 | \r | |
179 | \r | |
180 | /**\r | |
181 | Get a character from GDB. This function must be able to run in interrupt context.\r | |
182 | \r | |
183 | @return A character from GDB\r | |
3402aac7 | 184 | \r |
2ef2b01e A |
185 | **/\r |
186 | CHAR8\r | |
187 | EFIAPI\r | |
188 | GdbGetChar (\r | |
189 | VOID\r | |
190 | )\r | |
191 | {\r | |
192 | UINT8 Data;\r | |
193 | CHAR8 Char;\r | |
194 | \r | |
195 | // Wait for the serial port to be ready\r | |
196 | do {\r | |
197 | Data = IoRead8 (gPort + LSR_OFFSET);\r | |
198 | } while ((Data & LSR_RXDA) == 0);\r | |
199 | \r | |
200 | Char = IoRead8 (gPort);\r | |
3402aac7 | 201 | \r |
2ef2b01e A |
202 | // Make this an EFI_D_INFO after we get everything debugged.\r |
203 | DEBUG ((EFI_D_ERROR, "<%c<", Char));\r | |
204 | return Char;\r | |
205 | }\r | |
206 | \r | |
207 | \r | |
208 | /**\r | |
209 | Send a character to GDB. This function must be able to run in interrupt context.\r | |
210 | \r | |
211 | \r | |
212 | @param Char Send a character to GDB\r | |
213 | \r | |
214 | **/\r | |
215 | \r | |
216 | VOID\r | |
217 | EFIAPI\r | |
218 | GdbPutChar (\r | |
219 | IN CHAR8 Char\r | |
220 | )\r | |
221 | {\r | |
222 | UINT8 Data;\r | |
3402aac7 | 223 | \r |
2ef2b01e A |
224 | // Make this an EFI_D_INFO after we get everything debugged.\r |
225 | DEBUG ((EFI_D_ERROR, ">%c>", Char));\r | |
3402aac7 | 226 | \r |
2ef2b01e A |
227 | // Wait for the serial port to be ready\r |
228 | do {\r | |
229 | Data = IoRead8 (gPort + LSR_OFFSET);\r | |
230 | } while ((Data & LSR_TXRDY) == 0);\r | |
3402aac7 | 231 | \r |
2ef2b01e A |
232 | IoWrite8 (gPort, Char);\r |
233 | }\r | |
234 | \r | |
235 | /**\r | |
236 | Send an ASCII string to GDB. This function must be able to run in interrupt context.\r | |
237 | \r | |
238 | \r | |
239 | @param String Send a string to GDB\r | |
240 | \r | |
241 | **/\r | |
242 | \r | |
243 | VOID\r | |
244 | GdbPutString (\r | |
245 | IN CHAR8 *String\r | |
246 | )\r | |
247 | {\r | |
248 | while (*String != '\0') {\r | |
249 | GdbPutChar (*String);\r | |
250 | String++;\r | |
251 | }\r | |
252 | }\r | |
253 | \r | |
254 | \r | |
255 | \r | |
256 | \r |