UartCore.h@ 78381

Last change on this file since 78381 was 77411, checked in by vboxsync, 6 years ago
Devices/UART: Properly handle loopback mode (feeding the sent data immediately back to the receive side)
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 13.3 KB

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1	/* $Id: UartCore.h 77411 2019-02-21 15:57:31Z vboxsync $ */
2	/** @file
3	* UartCore - UART (16550A up to 16950) emulation.
4	*
5	* The documentation for this device was taken from the PC16550D spec from TI.
6	*/
7
8	/*
9	* Copyright (C) 2018-2019 Oracle Corporation
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*/
19
20	#ifndef VBOX_INCLUDED_SRC_Serial_UartCore_h
21	#define VBOX_INCLUDED_SRC_Serial_UartCore_h
22	#ifndef RT_WITHOUT_PRAGMA_ONCE
23	# pragma once
24	#endif
25
26	#include <VBox/types.h>
27	#include <VBox/vmm/pdmdev.h>
28	#include <VBox/vmm/pdmserialifs.h>
29	#include <VBox/vmm/ssm.h>
30	#include <iprt/assert.h>
31
32	RT_C_DECLS_BEGIN
33
34	/*********************************************************************************************************************************
35	* Defined Constants And Macros *
36	*********************************************************************************************************************************/
37
38	/** The current serial code saved state version. */
39	#define UART_SAVED_STATE_VERSION 7
40	/** Saved state version before the TX timer for the connected device case was added. */
41	#define UART_SAVED_STATE_VERSION_PRE_UNCONNECTED_TX_TIMER 6
42	/** Saved state version of the legacy code which got replaced after 5.2. */
43	#define UART_SAVED_STATE_VERSION_LEGACY_CODE 5
44	/** Includes some missing bits from the previous saved state. */
45	#define UART_SAVED_STATE_VERSION_MISSING_BITS 4
46	/** Saved state version when only the 16450 variant was implemented. */
47	#define UART_SAVED_STATE_VERSION_16450 3
48
49	/** Maximum size of a FIFO. */
50	#define UART_FIFO_LENGTH_MAX 128
51
52
53	/*********************************************************************************************************************************
54	* Structures and Typedefs *
55	*********************************************************************************************************************************/
56
57	/** Pointer to the UART core state. */
58	typedef struct UARTCORE *PUARTCORE;
59
60
61	/**
62	* UART core IRQ request callback to let the core instance raise/clear interrupt requests.
63	*
64	* @returns nothing.
65	* @param pDevIns The owning device instance.
66	* @param pThis The UART core instance.
67	* @param iLUN The LUN associated with the UART core.
68	* @param iLvl The interrupt level.
69	*/
70	typedef DECLCALLBACK(void) FNUARTCOREIRQREQ(PPDMDEVINS pDevIns, PUARTCORE pThis, unsigned iLUN, int iLvl);
71	/** Pointer to a UART core IRQ request callback. */
72	typedef FNUARTCOREIRQREQ *PFNUARTCOREIRQREQ;
73
74
75	/**
76	* UART type.
77	*/
78	typedef enum UARTTYPE
79	{
80	/** Invalid UART type. */
81	UARTTYPE_INVALID = 0,
82	/** 16450 UART type. */
83	UARTTYPE_16450,
84	/** 16550A UART type. */
85	UARTTYPE_16550A,
86	/** 16750 UART type. */
87	UARTTYPE_16750,
88	/** 32bit hack. */
89	UARTTYPE_32BIT_HACK = 0x7fffffff
90	} UARTTYPE;
91
92
93	/**
94	* UART FIFO.
95	*/
96	typedef struct UARTFIFO
97	{
98	/** Fifo size configured. */
99	uint8_t cbMax;
100	/** Current amount of bytes used. */
101	uint8_t cbUsed;
102	/** Next index to write to. */
103	uint8_t offWrite;
104	/** Next index to read from. */
105	uint8_t offRead;
106	/** The interrupt trigger level (only used for the receive FIFO). */
107	uint8_t cbItl;
108	/** The data in the FIFO. */
109	uint8_t abBuf[UART_FIFO_LENGTH_MAX];
110	/** Alignment to a 4 byte boundary. */
111	uint8_t au8Alignment0[3];
112	} UARTFIFO;
113	/** Pointer to a FIFO. */
114	typedef UARTFIFO *PUARTFIFO;
115
116
117	/**
118	* UART core device.
119	*
120	* @implements PDMIBASE
121	* @implements PDMISERIALPORT
122	*/
123	typedef struct UARTCORE
124	{
125	/** Access critical section. */
126	PDMCRITSECT CritSect;
127	/** Pointer to the device instance - R3 Ptr. */
128	PPDMDEVINSR3 pDevInsR3;
129	/** Pointer to the device instance - R0 Ptr. */
130	PPDMDEVINSR0 pDevInsR0;
131	/** Pointer to the device instance - RC Ptr. */
132	PPDMDEVINSRC pDevInsRC;
133	/** The LUN on the owning device instance for this core. */
134	uint32_t iLUN;
135	/** LUN\#0: The base interface. */
136	PDMIBASE IBase;
137	/** LUN\#0: The serial port interface. */
138	PDMISERIALPORT ISerialPort;
139	/** Pointer to the attached base driver. */
140	R3PTRTYPE(PPDMIBASE) pDrvBase;
141	/** Pointer to the attached serial driver. */
142	R3PTRTYPE(PPDMISERIALCONNECTOR) pDrvSerial;
143	/** Configuration flags. */
144	uint32_t fFlags;
145	/** The selected UART type. */
146	UARTTYPE enmType;
147
148	/** R3 timer pointer for the character timeout indication. */
149	PTMTIMERR3 pTimerRcvFifoTimeoutR3;
150	/** R3 timer pointer for the send loop if no driver is connected/loopback mode is active. */
151	PTMTIMERR3 pTimerTxUnconnectedR3;
152	/** R3 interrupt request callback of the owning device. */
153	R3PTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqR3;
154	/** R0 timer pointer fo the character timeout indication. */
155	PTMTIMERR0 pTimerRcvFifoTimeoutR0;
156	/** R0 timer pointer for the send loop if no driver is connected/loopback mode is active. */
157	PTMTIMERR0 pTimerTxUnconnectedR0;
158	/** R0 interrupt request callback of the owning device. */
159	R0PTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqR0;
160	/** RC timer pointer fo the character timeout indication. */
161	PTMTIMERRC pTimerRcvFifoTimeoutRC;
162	/** RC timer pointer for the send loop if no driver is connected/loopback mode is active. */
163	PTMTIMERRC pTimerTxUnconnectedRC;
164	/** RC interrupt request callback of the owning device. */
165	RCPTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqRC;
166	/** Alignment */
167	uint32_t u32Alignment;
168
169	/** The divisor register (DLAB = 1). */
170	uint16_t uRegDivisor;
171	/** The Receiver Buffer Register (RBR, DLAB = 0). */
172	uint8_t uRegRbr;
173	/** The Transmitter Holding Register (THR, DLAB = 0). */
174	uint8_t uRegThr;
175	/** The Interrupt Enable Register (IER, DLAB = 0). */
176	uint8_t uRegIer;
177	/** The Interrupt Identification Register (IIR). */
178	uint8_t uRegIir;
179	/** The FIFO Control Register (FCR). */
180	uint8_t uRegFcr;
181	/** The Line Control Register (LCR). */
182	uint8_t uRegLcr;
183	/** The Modem Control Register (MCR). */
184	uint8_t uRegMcr;
185	/** The Line Status Register (LSR). */
186	uint8_t uRegLsr;
187	/** The Modem Status Register (MSR). */
188	uint8_t uRegMsr;
189	/** The Scratch Register (SCR). */
190	uint8_t uRegScr;
191
192	/** Flag whether a character timeout interrupt is pending
193	* (no symbols were inserted or removed from the receive FIFO
194	* during an 4 times the character transmit/receive period and the FIFO
195	* is not empty). */
196	bool fIrqCtiPending;
197	/** Flag whether the transmitter holding register went empty since last time the
198	* IIR register was read. This gets reset when IIR is read so the guest will get this
199	* interrupt ID only once. */
200	bool fThreEmptyPending;
201	/** Alignment. */
202	bool afAlignment[2];
203	/** The transmit FIFO. */
204	UARTFIFO FifoXmit;
205	/** The receive FIFO. */
206	UARTFIFO FifoRecv;
207
208	/** Time it takes to transmit/receive a single symbol in timer ticks. */
209	uint64_t cSymbolXferTicks;
210	/** Number of bytes available for reading from the layer below. */
211	volatile uint32_t cbAvailRdr;
212
213	#if defined(IN_RC) \|\| HC_ARCH_BITS == 32
214	uint32_t uAlignment;
215	#endif
216	} UARTCORE;
217
218	AssertCompileSizeAlignment(UARTCORE, 8);
219
220
221	#ifndef VBOX_DEVICE_STRUCT_TESTCASE
222
223	/** Flag whether to yield the CPU on an LSR read. */
224	#define UART_CORE_YIELD_ON_LSR_READ RT_BIT_32(0)
225
226	/**
227	* Performs a register write to the given register offset.
228	*
229	* @returns VBox status code.
230	* @param pThis The UART core instance.
231	* @param uReg The register offset (byte offset) to start writing to.
232	* @param u32 The value to write.
233	* @param cb Number of bytes to write.
234	*/
235	DECLHIDDEN(int) uartRegWrite(PUARTCORE pThis, uint32_t uReg, uint32_t u32, size_t cb);
236
237	/**
238	* Performs a register read from the given register offset.
239	*
240	* @returns VBox status code.
241	* @param pThis The UART core instance.
242	* @param uReg The register offset (byte offset) to start reading from.
243	* @param pu32 Where to store the read value.
244	* @param cb Number of bytes to read.
245	*/
246	DECLHIDDEN(int) uartRegRead(PUARTCORE pThis, uint32_t uReg, uint32_t *pu32, size_t cb);
247
248	# ifdef IN_RING3
249	/**
250	* Initializes the given UART core instance using the provided configuration.
251	*
252	* @returns VBox status code.
253	* @param pThis The UART core instance to initialize.
254	* @param pDevInsR3 The R3 device instance pointer.
255	* @param enmType The type of UART emulated.
256	* @param iLUN The LUN the UART should look for attached drivers.
257	* @param fFlags Additional flags controlling device behavior.
258	* @param pfnUartIrqReqR3 Pointer to the R3 interrupt request callback.
259	* @param pfnUartIrqReqR0 Pointer to the R0 interrupt request callback.
260	* @param pfnUartIrqReqRC Pointer to the RC interrupt request callback.
261	*/
262	DECLHIDDEN(int) uartR3Init(PUARTCORE pThis, PPDMDEVINS pDevInsR3, UARTTYPE enmType, unsigned iLUN, uint32_t fFlags,
263	R3PTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqR3, R0PTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqR0,
264	RCPTRTYPE(PFNUARTCOREIRQREQ) pfnUartIrqReqRC);
265
266	/**
267	* Destroys the given UART core instance freeing all allocated resources.
268	*
269	* @returns nothing.
270	* @param pThis The UART core instance.
271	*/
272	DECLHIDDEN(void) uartR3Destruct(PUARTCORE pThis);
273
274	/**
275	* Detaches any attached driver from the given UART core instance.
276	*
277	* @returns nothing.
278	* @param pThis The UART core instance.
279	*/
280	DECLHIDDEN(void) uartR3Detach(PUARTCORE pThis);
281
282	/**
283	* Attaches the given UART core instance to the drivers at the given LUN.
284	*
285	* @returns VBox status code.
286	* @param pThis The UART core instance.
287	* @param iLUN The LUN being attached.
288	*/
289	DECLHIDDEN(int) uartR3Attach(PUARTCORE pThis, unsigned iLUN);
290
291	/**
292	* Resets the given UART core instance.
293	*
294	* @returns nothing.
295	* @param pThis The UART core instance.
296	*/
297	DECLHIDDEN(void) uartR3Reset(PUARTCORE pThis);
298
299	/**
300	* Relocates an RC pointers of the given UART core instance
301	*
302	* @returns nothing.
303	* @param pThis The UART core instance.
304	* @param offDelta The delta to relocate RC pointers with.
305	*/
306	DECLHIDDEN(void) uartR3Relocate(PUARTCORE pThis, RTGCINTPTR offDelta);
307
308	/**
309	* Saves the UART state to the given SSM handle.
310	*
311	* @returns VBox status code.
312	* @param pThis The UART core instance.
313	* @param pSSM The SSM handle to save to.
314	*/
315	DECLHIDDEN(int) uartR3SaveExec(PUARTCORE pThis, PSSMHANDLE pSSM);
316
317	/**
318	* Loads the UART state from the given SSM handle.
319	*
320	* @returns VBox status code.
321	* @param pThis The UART core instance.
322	* @param pSSM The SSM handle to load from.
323	* @param uVersion Saved state version.
324	* @param uPass The SSM pass the call is done in.
325	* @param puIrq Where to store the IRQ value for legacy
326	* saved states - optional.
327	* @param pPortBase Where to store the I/O port base for legacy
328	* saved states - optional.
329	*/
330	DECLHIDDEN(int) uartR3LoadExec(PUARTCORE pThis, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass,
331	uint8_t puIrq, RTIOPORT pPortBase);
332
333	/**
334	* Called when loading the state completed, updates the parameters of any driver underneath.
335	*
336	* @returns VBox status code.
337	* @param pThis The UART core instance.
338	* @param pSSM The SSM handle.
339	*/
340	DECLHIDDEN(int) uartR3LoadDone(PUARTCORE pThis, PSSMHANDLE pSSM);
341
342	# endif
343
344	#endif
345
346	RT_C_DECLS_END
347
348	#endif /* !VBOX_INCLUDED_SRC_Serial_UartCore_h */

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source: vbox/trunk/src/VBox/Devices/Serial/UartCore.h@ 78381

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