| /* pdp8_df.c: DF32 fixed head disk simulator | |
| Copyright (c) 1993-2005, Robert M Supnik | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of Robert M Supnik shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Robert M Supnik. | |
| df DF32 fixed head disk | |
| 04-Jan-04 RMS Changed sim_fsize calling sequence | |
| 26-Oct-03 RMS Cleaned up buffer copy code | |
| 26-Jul-03 RMS Fixed bug in set size routine | |
| 14-Mar-03 RMS Fixed variable platter interaction with save/restore | |
| 03-Mar-03 RMS Fixed autosizing | |
| 02-Feb-03 RMS Added variable platter and autosizing support | |
| 04-Oct-02 RMS Added DIBs, device number support | |
| 28-Nov-01 RMS Added RL8A support | |
| 25-Apr-01 RMS Added device enable/disable support | |
| The DF32 is a head-per-track disk. It uses the three cycle data break | |
| facility. To minimize overhead, the entire DF32 is buffered in memory. | |
| Two timing parameters are provided: | |
| df_time Interword timing, must be non-zero | |
| df_burst Burst mode, if 0, DMA occurs cycle by cycle; otherwise, | |
| DMA occurs in a burst | |
| */ | |
| #include "pdp8_defs.h" | |
| #include <math.h> | |
| #define UNIT_V_AUTO (UNIT_V_UF + 0) /* autosize */ | |
| #define UNIT_V_PLAT (UNIT_V_UF + 1) /* #platters - 1 */ | |
| #define UNIT_M_PLAT 03 | |
| #define UNIT_PLAT (UNIT_M_PLAT << UNIT_V_PLAT) | |
| #define UNIT_GETP(x) ((((x) >> UNIT_V_PLAT) & UNIT_M_PLAT) + 1) | |
| #define UNIT_AUTO (1 << UNIT_V_AUTO) | |
| #define UNIT_PLAT (UNIT_M_PLAT << UNIT_V_PLAT) | |
| /* Constants */ | |
| #define DF_NUMWD 2048 /* words/track */ | |
| #define DF_NUMTR 16 /* tracks/disk */ | |
| #define DF_DKSIZE (DF_NUMTR * DF_NUMWD) /* words/disk */ | |
| #define DF_NUMDK 4 /* disks/controller */ | |
| #define DF_WC 07750 /* word count */ | |
| #define DF_MA 07751 /* mem address */ | |
| #define DF_WMASK (DF_NUMWD - 1) /* word mask */ | |
| /* Parameters in the unit descriptor */ | |
| #define FUNC u4 /* function */ | |
| #define DF_READ 2 /* read */ | |
| #define DF_WRITE 4 /* write */ | |
| /* Status register */ | |
| #define DFS_PCA 04000 /* photocell status */ | |
| #define DFS_DEX 03700 /* disk addr extension */ | |
| #define DFS_MEX 00070 /* mem addr extension */ | |
| #define DFS_DRL 00004 /* data late error */ | |
| #define DFS_WLS 00002 /* write lock error */ | |
| #define DFS_NXD 00002 /* non-existent disk */ | |
| #define DFS_PER 00001 /* parity error */ | |
| #define DFS_ERR (DFS_DRL | DFS_WLS | DFS_PER) | |
| #define DFS_V_DEX 6 | |
| #define DFS_V_MEX 3 | |
| #define GET_MEX(x) (((x) & DFS_MEX) << (12 - DFS_V_MEX)) | |
| #define GET_DEX(x) (((x) & DFS_DEX) << (12 - DFS_V_DEX)) | |
| #define GET_POS(x) ((int) fmod (sim_gtime() / ((double) (x)), \ | |
| ((double) DF_NUMWD))) | |
| #define UPDATE_PCELL if (GET_POS (df_time) < 6) df_sta = df_sta | DFS_PCA; \ | |
| else df_sta = df_sta & ~DFS_PCA | |
| extern uint16 M[]; | |
| extern int32 int_req, stop_inst; | |
| extern UNIT cpu_unit; | |
| int32 df_sta = 0; /* status register */ | |
| int32 df_da = 0; /* disk address */ | |
| int32 df_done = 0; /* done flag */ | |
| int32 df_wlk = 0; /* write lock */ | |
| int32 df_time = 10; /* inter-word time */ | |
| int32 df_burst = 1; /* burst mode flag */ | |
| int32 df_stopioe = 1; /* stop on error */ | |
| DEVICE df_dev; | |
| int32 df60 (int32 IR, int32 AC); | |
| int32 df61 (int32 IR, int32 AC); | |
| int32 df62 (int32 IR, int32 AC); | |
| t_stat df_svc (UNIT *uptr); | |
| t_stat pcell_svc (UNIT *uptr); | |
| t_stat df_reset (DEVICE *dptr); | |
| t_stat df_boot (int32 unitno, DEVICE *dptr); | |
| t_stat df_attach (UNIT *uptr, char *cptr); | |
| t_stat df_set_size (UNIT *uptr, int32 val, char *cptr, void *desc); | |
| /* DF32 data structures | |
| df_dev RF device descriptor | |
| df_unit RF unit descriptor | |
| pcell_unit photocell timing unit (orphan) | |
| df_reg RF register list | |
| */ | |
| DIB df_dib = { DEV_DF, 3, { &df60, &df61, &df62 } }; | |
| UNIT df_unit = { | |
| UDATA (&df_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+UNIT_MUSTBUF, | |
| DF_DKSIZE) | |
| }; | |
| REG df_reg[] = { | |
| { ORDATA (STA, df_sta, 12) }, | |
| { ORDATA (DA, df_da, 12) }, | |
| { ORDATA (WC, M[DF_WC], 12) }, | |
| { ORDATA (MA, M[DF_MA], 12) }, | |
| { FLDATA (DONE, df_done, 0) }, | |
| { FLDATA (INT, int_req, INT_V_DF) }, | |
| { ORDATA (WLS, df_wlk, 8) }, | |
| { DRDATA (TIME, df_time, 24), REG_NZ + PV_LEFT }, | |
| { FLDATA (BURST, df_burst, 0) }, | |
| { FLDATA (STOP_IOE, df_stopioe, 0) }, | |
| { DRDATA (CAPAC, df_unit.capac, 18), REG_HRO }, | |
| { ORDATA (DEVNUM, df_dib.dev, 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB df_mod[] = { | |
| { UNIT_PLAT, (0 << UNIT_V_PLAT), NULL, "1P", &df_set_size }, | |
| { UNIT_PLAT, (1 << UNIT_V_PLAT), NULL, "2P", &df_set_size }, | |
| { UNIT_PLAT, (2 << UNIT_V_PLAT), NULL, "3P", &df_set_size }, | |
| { UNIT_PLAT, (3 << UNIT_V_PLAT), NULL, "4P", &df_set_size }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO", | |
| &set_dev, &show_dev, NULL }, | |
| { 0 } | |
| }; | |
| DEVICE df_dev = { | |
| "DF", &df_unit, df_reg, df_mod, | |
| 1, 8, 17, 1, 8, 12, | |
| NULL, NULL, &df_reset, | |
| &df_boot, &df_attach, NULL, | |
| &df_dib, DEV_DISABLE | |
| }; | |
| /* IOT routines */ | |
| int32 df60 (int32 IR, int32 AC) | |
| { | |
| int32 t; | |
| int32 pulse = IR & 07; | |
| UPDATE_PCELL; /* update photocell */ | |
| if (pulse & 1) { /* DCMA */ | |
| df_da = 0; /* clear disk addr */ | |
| df_done = 0; /* clear done */ | |
| df_sta = df_sta & ~DFS_ERR; /* clear errors */ | |
| int_req = int_req & ~INT_DF; /* clear int req */ | |
| } | |
| if (pulse & 6) { /* DMAR, DMAW */ | |
| df_da = df_da | AC; /* disk addr |= AC */ | |
| df_unit.FUNC = pulse & ~1; /* save function */ | |
| t = (df_da & DF_WMASK) - GET_POS (df_time); /* delta to new loc */ | |
| if (t < 0) t = t + DF_NUMWD; /* wrap around? */ | |
| sim_activate (&df_unit, t * df_time); /* schedule op */ | |
| AC = 0; /* clear AC */ | |
| } | |
| return AC; | |
| } | |
| /* Based on the hardware implementation. DEAL and DEAC work as follows: | |
| 6615 pulse 1 = clear df_sta<dex,mex> | |
| pulse 4 = df_sta = df_sta | AC<dex,mex> | |
| AC = AC | old_df_sta | |
| 6616 pulse 2 = clear AC, skip if address confirmed | |
| pulse 4 = df_sta = df_sta | AC<dex,mex> = 0 (nop) | |
| AC = AC | old_df_sta | |
| */ | |
| int32 df61 (int32 IR, int32 AC) | |
| { | |
| int32 old_df_sta = df_sta; | |
| int32 pulse = IR & 07; | |
| UPDATE_PCELL; /* update photocell */ | |
| if (pulse & 1) /* DCEA */ | |
| df_sta = df_sta & ~(DFS_DEX | DFS_MEX); /* clear dex, mex */ | |
| if (pulse & 2) /* DSAC */ | |
| AC = ((df_da & DF_WMASK) == GET_POS (df_time))? IOT_SKP: 0; | |
| if (pulse & 4) { | |
| df_sta = df_sta | (AC & (DFS_DEX | DFS_MEX)); /* DEAL */ | |
| AC = AC | old_df_sta; /* DEAC */ | |
| } | |
| return AC; | |
| } | |
| int32 df62 (int32 IR, int32 AC) | |
| { | |
| int32 pulse = IR & 07; | |
| UPDATE_PCELL; /* update photocell */ | |
| if (pulse & 1) { /* DFSE */ | |
| if ((df_sta & DFS_ERR) == 0) AC = AC | IOT_SKP; | |
| } | |
| if (pulse & 2) { /* DFSC */ | |
| if (pulse & 4) AC = AC & ~07777; /* for DMAC */ | |
| else if (df_done) AC = AC | IOT_SKP; | |
| } | |
| if (pulse & 4) AC = AC | df_da; /* DMAC */ | |
| return AC; | |
| } | |
| /* Unit service | |
| Note that for reads and writes, memory addresses wrap around in the | |
| current field. This code assumes the entire disk is buffered. | |
| */ | |
| t_stat df_svc (UNIT *uptr) | |
| { | |
| int32 pa, t, mex; | |
| uint32 da; | |
| int16 *fbuf = uptr->filebuf; | |
| UPDATE_PCELL; /* update photocell */ | |
| if ((uptr->flags & UNIT_BUF) == 0) { /* not buf? abort */ | |
| df_done = 1; | |
| int_req = int_req | INT_DF; /* update int req */ | |
| return IORETURN (df_stopioe, SCPE_UNATT); | |
| } | |
| mex = GET_MEX (df_sta); | |
| da = GET_DEX (df_sta) | df_da; /* form disk addr */ | |
| do { | |
| if (da >= uptr->capac) { /* nx disk addr? */ | |
| df_sta = df_sta | DFS_NXD; | |
| break; | |
| } | |
| M[DF_WC] = (M[DF_WC] + 1) & 07777; /* incr word count */ | |
| M[DF_MA] = (M[DF_MA] + 1) & 07777; /* incr mem addr */ | |
| pa = mex | M[DF_MA]; /* add extension */ | |
| if (uptr->FUNC == DF_READ) { /* read? */ | |
| if (MEM_ADDR_OK (pa)) M[pa] = fbuf[da]; /* if !nxm, read wd */ | |
| } | |
| else { /* write */ | |
| t = (da >> 14) & 07; /* check wr lock */ | |
| if ((df_wlk >> t) & 1) /* locked? set err */ | |
| df_sta = df_sta | DFS_WLS; | |
| else { /* not locked */ | |
| fbuf[da] = M[pa]; /* write word */ | |
| if (da >= uptr->hwmark) uptr->hwmark = da + 1; | |
| } | |
| } | |
| da = (da + 1) & 0377777; /* incr disk addr */ | |
| } while ((M[DF_WC] != 0) && (df_burst != 0)); /* brk if wc, no brst */ | |
| if ((M[DF_WC] != 0) && ((df_sta & DFS_ERR) == 0)) /* more to do? */ | |
| sim_activate (&df_unit, df_time); /* sched next */ | |
| else { | |
| if (uptr->FUNC != DF_READ) da = (da - 1) & 0377777; | |
| df_done = 1; /* done */ | |
| int_req = int_req | INT_DF; /* update int req */ | |
| } | |
| df_sta = (df_sta & ~DFS_DEX) | ((da >> (12 - DFS_V_DEX)) & DFS_DEX); | |
| df_da = da & 07777; /* separate disk addr */ | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat df_reset (DEVICE *dptr) | |
| { | |
| df_sta = df_da = 0; | |
| df_done = 1; | |
| int_req = int_req & ~INT_DF; /* clear interrupt */ | |
| sim_cancel (&df_unit); | |
| return SCPE_OK; | |
| } | |
| /* Bootstrap routine */ | |
| #define OS8_START 07750 | |
| #define OS8_LEN (sizeof (os8_rom) / sizeof (int16)) | |
| #define DM4_START 00200 | |
| #define DM4_LEN (sizeof (dm4_rom) / sizeof (int16)) | |
| static const uint16 os8_rom[] = { | |
| 07600, /* 7750, CLA CLL ; also word count */ | |
| 06603, /* 7751, DMAR ; also address */ | |
| 06622, /* 7752, DFSC ; done? */ | |
| 05352, /* 7753, JMP .-1 ; no */ | |
| 05752 /* 7754, JMP @.-2 ; enter boot */ | |
| }; | |
| static const uint16 dm4_rom[] = { | |
| 00200, 07600, /* 0200, CLA CLL */ | |
| 00201, 06603, /* 0201, DMAR ; read */ | |
| 00202, 06622, /* 0202, DFSC ; done? */ | |
| 00203, 05202, /* 0203, JMP .-1 ; no */ | |
| 00204, 05600, /* 0204, JMP @.-4 ; enter boot */ | |
| 07750, 07576, /* 7750, 7576 ; word count */ | |
| 07751, 07576 /* 7751, 7576 ; address */ | |
| }; | |
| t_stat df_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| int32 i; | |
| extern int32 sim_switches, saved_PC; | |
| if (sim_switches & SWMASK ('D')) { | |
| for (i = 0; i < DM4_LEN; i = i + 2) | |
| M[dm4_rom[i]] = dm4_rom[i + 1]; | |
| saved_PC = DM4_START; | |
| } | |
| else { | |
| for (i = 0; i < OS8_LEN; i++) | |
| M[OS8_START + i] = os8_rom[i]; | |
| saved_PC = OS8_START; | |
| } | |
| return SCPE_OK; | |
| } | |
| /* Attach routine */ | |
| t_stat df_attach (UNIT *uptr, char *cptr) | |
| { | |
| uint32 p, sz; | |
| uint32 ds_bytes = DF_DKSIZE * sizeof (int16); | |
| t_stat r; | |
| r = attach_unit (uptr, cptr); | |
| if (r != SCPE_OK) return r; | |
| if ((uptr->flags & UNIT_AUTO) && (sz = sim_fsize (uptr->fileref))) { | |
| p = (sz + ds_bytes - 1) / ds_bytes; | |
| if (p >= DF_NUMDK) p = DF_NUMDK - 1; | |
| uptr->flags = (uptr->flags & ~UNIT_PLAT) | | |
| (p << UNIT_V_PLAT); | |
| } | |
| uptr->capac = UNIT_GETP (uptr->flags) * DF_DKSIZE; | |
| return SCPE_OK; | |
| } | |
| /* Change disk size */ | |
| t_stat df_set_size (UNIT *uptr, int32 val, char *cptr, void *desc) | |
| { | |
| if (val < 0) return SCPE_IERR; | |
| if (uptr->flags & UNIT_ATT) return SCPE_ALATT; | |
| uptr->capac = UNIT_GETP (val) * DF_DKSIZE; | |
| uptr->flags = uptr->flags & ~UNIT_AUTO; | |
| return SCPE_OK; | |
| } |