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/* $OpenBSD: ns8250.h,v 1.9 2019/12/11 06:45:16 pd Exp $ */
/*
* Copyright (c) 2016 Mike Larkin <mlarkin@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Emulated 8250 UART
*/
#define COM1_BASE 0x3f8
#define COM1_DATA COM1_BASE+COM_OFFSET_DATA
#define COM1_IER COM1_BASE+COM_OFFSET_IER
#define COM1_IIR COM1_BASE+COM_OFFSET_IIR
#define COM1_LCR COM1_BASE+COM_OFFSET_LCR
#define COM1_MCR COM1_BASE+COM_OFFSET_MCR
#define COM1_LSR COM1_BASE+COM_OFFSET_LSR
#define COM1_MSR COM1_BASE+COM_OFFSET_MSR
#define COM1_SCR COM1_BASE+COM_OFFSET_SCR
#define COM_OFFSET_DATA 0
#define COM_OFFSET_IER 1
#define COM_OFFSET_IIR 2
#define COM_OFFSET_LCR 3
#define COM_OFFSET_MCR 4
#define COM_OFFSET_LSR 5
#define COM_OFFSET_MSR 6
#define COM_OFFSET_SCR 7
/* ns8250 port identifier */
enum ns8250_portid {
NS8250_COM1,
NS8250_COM2,
};
/* ns8250 UART registers */
struct ns8250_regs {
uint8_t lcr; /* Line Control Register */
uint8_t fcr; /* FIFO Control Register */
uint8_t iir; /* Interrupt ID Register */
uint8_t ier; /* Interrupt Enable Register */
uint8_t divlo; /* Baud rate divisor low byte */
uint8_t divhi; /* Baud rate divisor high byte */
uint8_t msr; /* Modem Status Register */
uint8_t lsr; /* Line Status Register */
uint8_t mcr; /* Modem Control Register */
uint8_t scr; /* Scratch Register */
uint8_t data; /* Unread input data */
};
/* ns8250 UART device state */
struct ns8250_dev {
pthread_mutex_t mutex;
struct ns8250_regs regs;
struct event event;
struct event rate;
struct event wake;
struct timeval rate_tv;
enum ns8250_portid portid;
int fd;
int irq;
int rcv_pending;
uint32_t vmid;
uint64_t byte_out;
uint32_t baudrate;
uint32_t pause_ct;
};
void ns8250_init(int, uint32_t);
uint8_t vcpu_exit_com(struct vm_run_params *);
uint8_t vcpu_process_com_data(struct vm_exit *, uint32_t, uint32_t);
void vcpu_process_com_lcr(struct vm_exit *);
void vcpu_process_com_lsr(struct vm_exit *);
void vcpu_process_com_ier(struct vm_exit *);
void vcpu_process_com_mcr(struct vm_exit *);
void vcpu_process_com_iir(struct vm_exit *);
void vcpu_process_com_msr(struct vm_exit *);
void vcpu_process_com_scr(struct vm_exit *);
int ns8250_dump(int);
int ns8250_restore(int, int, uint32_t);
void ns8250_stop(void);
void ns8250_start(void);
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