137 lines
5.2 KiB
C
137 lines
5.2 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* Definitions for the generic NVRAM/CMOS driver.
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*
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*
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*
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* Authors: Fred N. van Kempen, <decwiz@yahoo.com>,
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* David Hrdlička, <hrdlickadavid@outlook.com>
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*
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* Copyright 2017-2020 Fred N. van Kempen.
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* Copyright 2018-2020 David Hrdlička.
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*
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* Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the entire
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* above notice, this list of conditions and the following
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* disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names
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* of its contributors may be used to endorse or promote
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* products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef EMU_NVR_H
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#define EMU_NVR_H
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#define NVR_MAXSIZE 512 /* max size of NVR data */
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/* Conversion from BCD to Binary and vice versa. */
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#define RTC_BCD(x) (((x) % 10) | (((x) / 10) << 4))
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#define RTC_DCB(x) ((((x) &0xf0) >> 4) * 10 + ((x) &0x0f))
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#define RTC_BCDINC(x, y) RTC_BCD(RTC_DCB(x) + y)
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/* Time sync options */
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#define TIME_SYNC_DISABLED 0
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#define TIME_SYNC_ENABLED 1
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#define TIME_SYNC_UTC 2
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/* Define a generic RTC/NVRAM device. */
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typedef struct _nvr_ {
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char *fn; /* pathname of image file */
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uint16_t size; /* device configuration */
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int8_t irq;
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int8_t is_new;
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uint8_t onesec_cnt;
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pc_timer_t onesec_time;
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void *data; /* local data */
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/* Hooks to device functions. */
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void (*reset)(struct _nvr_ *);
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void (*start)(struct _nvr_ *);
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void (*tick)(struct _nvr_ *);
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void (*ven_save)(void);
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uint8_t regs[NVR_MAXSIZE]; /* these are the registers */
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} nvr_t;
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extern int nvr_dosave;
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#ifdef EMU_DEVICE_H
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extern const device_t at_nvr_old_device;
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extern const device_t at_nvr_device;
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extern const device_t at_mb_nvr_device;
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extern const device_t ps_nvr_device;
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extern const device_t amstrad_nvr_device;
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extern const device_t amstrad_megapc_nvr_device;
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extern const device_t ibmat_nvr_device;
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extern const device_t piix4_nvr_device;
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extern const device_t ps_no_nmi_nvr_device;
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extern const device_t amstrad_no_nmi_nvr_device;
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extern const device_t ami_1992_nvr_device;
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extern const device_t ami_1994_nvr_device;
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extern const device_t ami_1995_nvr_device;
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extern const device_t via_nvr_device;
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extern const device_t p6rp4_nvr_device;
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extern const device_t elt_nvr_device;
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#endif
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extern void rtc_tick(void);
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extern void nvr_init(nvr_t *);
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extern char *nvr_path(char *str);
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extern FILE *nvr_fopen(char *str, char *mode);
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extern int nvr_load(void);
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extern void nvr_close(void);
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extern void nvr_set_ven_save(void (*ven_save)(void));
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extern int nvr_save(void);
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extern int nvr_is_leap(int year);
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extern int nvr_get_days(int month, int year);
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extern void nvr_time_sync(void);
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extern void nvr_time_get(struct tm *);
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extern void nvr_time_set(struct tm *);
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extern void nvr_reg_write(uint16_t reg, uint8_t val, void *priv);
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extern void nvr_at_handler(int set, uint16_t base, nvr_t *nvr);
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extern void nvr_at_sec_handler(int set, uint16_t base, nvr_t *nvr);
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extern void nvr_at_index_read_handler(int set, uint16_t base, nvr_t *nvr);
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extern void nvr_read_addr_set(int set, nvr_t *nvr);
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extern uint8_t nvr_get_index(void *priv, uint8_t addr_id);
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extern void nvr_at_data_port(int set, nvr_t *nvr);
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extern void nvr_wp_set(int set, int h, nvr_t *nvr);
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extern void nvr_via_wp_set(int set, int reg, nvr_t *nvr);
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extern void nvr_bank_set(int base, uint8_t bank, nvr_t *nvr);
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extern void nvr_lock_set(int base, int size, int lock, nvr_t *nvr);
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extern void nvr_irq_set(int irq, nvr_t *nvr);
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extern void nvr_smi_enable(int enable, nvr_t *nvr);
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extern uint8_t nvr_smi_status(nvr_t *nvr);
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extern void nvr_smi_status_clear(nvr_t *nvr);
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#endif /*EMU_NVR_H*/
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