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3b2: Time of Day Clock

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- This change adds support for storing time between boots in the Time
  of Day clock. An effort has been made to keep the Time of Day clock
  in sync with the wall clock between boots, so that user-set time
  advances properly between boots.

- Added a couple of custom help routines for TOD and NVRAM.
  I will be filling in more help routines as time permits.
This commit is contained in:
Seth Morabito
2017-11-26 18:26:05 -08:00
parent 3147c30b80
commit 00f8bbcef1
2 changed files with 393 additions and 26 deletions
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34
3B2/3b2_sysdev.h
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@@ -59,6 +59,7 @@ uint32 nvram_read(uint32 pa, size_t size);
t_stat nvram_attach(UNIT *uptr, CONST char *cptr);
t_stat nvram_detach(UNIT *uptr);
const char *nvram_description(DEVICE *dptr);
t_stat nvram_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);
void nvram_write(uint32 pa, uint32 val, size_t size);
/* 8253 Timer */
@@ -78,8 +79,41 @@ uint32 csr_read(uint32 pa, size_t size);
void csr_write(uint32 pa, uint32 val, size_t size);
/* TOD */
typedef enum tod_action {
TOD_SAVE,
TOD_RESTORE
} TOD_ACTION;
typedef struct tod_data {
time_t rsec; /* Real clock time from the host */
t_uint64 ssec; /* Simulated time in 1/10th second since the epoch */
uint8 tsec; /* 1/10 seconds */
uint8 unit_sec; /* 1's column seconds */
uint8 ten_sec; /* 10's column seconds */
uint8 unit_min; /* 1's column minutes */
uint8 ten_min; /* 10's column minutes */
uint8 unit_hour; /* 1's column hours */
uint8 ten_hour; /* 10's column hours */
uint8 unit_day; /* 1's column day of month */
uint8 ten_day; /* 10's column day of month */
uint8 wday; /* Day of week (0-6) */
uint8 unit_mon; /* 1's column month */
uint8 ten_mon; /* 10's column month */
uint8 year; /* 1, 2, 4, 8 shift register */
uint8 pad[3]; /* Padding to 32 bytes */
} TOD_DATA;
void tod_init_time();
void tod_update_tdata();
void tod_update_ssec();
void tod_sync();
t_stat tod_svc(UNIT *uptr);
t_stat tod_reset(DEVICE *dptr);
t_stat tod_attach(UNIT *uptr, CONST char *cptr);
t_stat tod_detach(UNIT *uptr);
const char *tod_description(DEVICE *dptr);
t_stat tod_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);
uint32 tod_read(uint32 pa, size_t size);
void tod_write(uint32, uint32 val, size_t size);
#endif