| /* pdp18b_drm.c: drum/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. | |
| drm (PDP-4,PDP-7) Type 24 serial drum | |
| 14-Jan-04 RMS Revised IO device call interface | |
| 26-Oct-03 RMS Cleaned up buffer copy code | |
| 05-Dec-02 RMS Updated from Type 24 documentation | |
| 22-Nov-02 RMS Added PDP-4 support | |
| 05-Feb-02 RMS Added DIB, device number support | |
| 03-Feb-02 RMS Fixed bug in reset routine (found by Robert Alan Byer) | |
| 06-Jan-02 RMS Revised enable/disable support | |
| 25-Nov-01 RMS Revised interrupt structure | |
| 10-Jun-01 RMS Cleaned up IOT decoding to reflect hardware | |
| 26-Apr-01 RMS Added device enable/disable support | |
| 14-Apr-99 RMS Changed t_addr to unsigned | |
| */ | |
| #include "pdp18b_defs.h" | |
| #include <math.h> | |
| /* Constants */ | |
| #define DRM_NUMWDS 256 /* words/sector */ | |
| #define DRM_NUMSC 2 /* sectors/track */ | |
| #define DRM_NUMTR 256 /* tracks/drum */ | |
| #define DRM_NUMDK 1 /* drum/controller */ | |
| #define DRM_NUMWDT (DRM_NUMWDS * DRM_NUMSC) /* words/track */ | |
| #define DRM_SIZE (DRM_NUMDK * DRM_NUMTR * DRM_NUMWDT) /* words/drum */ | |
| #define DRM_SMASK ((DRM_NUMTR * DRM_NUMSC) - 1) /* sector mask */ | |
| /* Parameters in the unit descriptor */ | |
| #define FUNC u4 /* function */ | |
| #define DRM_READ 000 /* read */ | |
| #define DRM_WRITE 040 /* write */ | |
| #define GET_POS(x) ((int) fmod (sim_gtime() / ((double) (x)), \ | |
| ((double) DRM_NUMWDT))) | |
| extern int32 M[]; | |
| extern int32 int_hwre[API_HLVL+1]; | |
| extern UNIT cpu_unit; | |
| int32 drm_da = 0; /* track address */ | |
| int32 drm_ma = 0; /* memory address */ | |
| int32 drm_err = 0; /* error flag */ | |
| int32 drm_wlk = 0; /* write lock */ | |
| int32 drm_time = 10; /* inter-word time */ | |
| int32 drm_stopioe = 1; /* stop on error */ | |
| DEVICE drm_dev; | |
| int32 drm60 (int32 dev, int32 pulse, int32 AC); | |
| int32 drm61 (int32 dev, int32 pulse, int32 AC); | |
| int32 drm62 (int32 dev, int32 pulse, int32 AC); | |
| int32 drm_iors (void); | |
| t_stat drm_svc (UNIT *uptr); | |
| t_stat drm_reset (DEVICE *dptr); | |
| t_stat drm_boot (int32 unitno, DEVICE *dptr); | |
| /* DRM data structures | |
| drm_dev DRM device descriptor | |
| drm_unit DRM unit descriptor | |
| drm_reg DRM register list | |
| */ | |
| DIB drm_dib = { DEV_DRM, 3 ,&drm_iors, { &drm60, &drm61, &drm62 } }; | |
| UNIT drm_unit = { | |
| UDATA (&drm_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+UNIT_MUSTBUF, | |
| DRM_SIZE) | |
| }; | |
| REG drm_reg[] = { | |
| { ORDATA (DA, drm_da, 9) }, | |
| { ORDATA (MA, drm_ma, 16) }, | |
| { FLDATA (INT, int_hwre[API_DRM], INT_V_DRM) }, | |
| { FLDATA (DONE, int_hwre[API_DRM], INT_V_DRM) }, | |
| { FLDATA (ERR, drm_err, 0) }, | |
| { ORDATA (WLK, drm_wlk, 32) }, | |
| { DRDATA (TIME, drm_time, 24), REG_NZ + PV_LEFT }, | |
| { FLDATA (STOP_IOE, drm_stopioe, 0) }, | |
| { ORDATA (DEVNO, drm_dib.dev, 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB drm_mod[] = { | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO", &set_devno, &show_devno }, | |
| { 0 } | |
| }; | |
| DEVICE drm_dev = { | |
| "DRM", &drm_unit, drm_reg, drm_mod, | |
| 1, 8, 20, 1, 8, 18, | |
| NULL, NULL, &drm_reset, | |
| &drm_boot, NULL, NULL, | |
| &drm_dib, DEV_DISABLE | |
| }; | |
| /* IOT routines */ | |
| int32 drm60 (int32 dev, int32 pulse, int32 AC) | |
| { | |
| if ((pulse & 027) == 06) { /* DRLR, DRLW */ | |
| drm_ma = AC & 0177777; /* load mem addr */ | |
| drm_unit.FUNC = pulse & DRM_WRITE; /* save function */ | |
| } | |
| return AC; | |
| } | |
| int32 drm61 (int32 dev, int32 pulse, int32 AC) | |
| { | |
| int32 t; | |
| if (pulse & 001) { /* DRSF */ | |
| if (TST_INT (DRM)) AC = AC | IOT_SKP; | |
| } | |
| if (pulse & 002) { /* DRCF */ | |
| CLR_INT (DRM); /* clear done */ | |
| drm_err = 0; /* clear error */ | |
| } | |
| if (pulse & 004) { /* DRSS */ | |
| drm_da = AC & DRM_SMASK; /* load sector # */ | |
| t = ((drm_da % DRM_NUMSC) * DRM_NUMWDS) - GET_POS (drm_time); | |
| if (t <= 0) t = t + DRM_NUMWDT; /* wrap around? */ | |
| sim_activate (&drm_unit, t * drm_time); /* schedule op */ | |
| } | |
| return AC; | |
| } | |
| int32 drm62 (int32 dev, int32 pulse, int32 AC) | |
| { | |
| int32 t; | |
| if (pulse & 001) { /* DRSN */ | |
| if (drm_err == 0) AC = AC | IOT_SKP; | |
| } | |
| if (pulse & 004) { /* DRCS */ | |
| CLR_INT (DRM); /* clear done */ | |
| drm_err = 0; /* clear error */ | |
| t = ((drm_da % DRM_NUMSC) * DRM_NUMWDS) - GET_POS (drm_time); | |
| if (t <= 0) t = t + DRM_NUMWDT; /* wrap around? */ | |
| sim_activate (&drm_unit, t * drm_time); /* schedule op */ | |
| } | |
| return AC; | |
| } | |
| /* Unit service | |
| This code assumes the entire drum is buffered. | |
| */ | |
| t_stat drm_svc (UNIT *uptr) | |
| { | |
| int32 i; | |
| uint32 da; | |
| int32 *fbuf = uptr->filebuf; | |
| if ((uptr->flags & UNIT_BUF) == 0) { /* not buf? abort */ | |
| drm_err = 1; /* set error */ | |
| SET_INT (DRM); /* set done */ | |
| return IORETURN (drm_stopioe, SCPE_UNATT); | |
| } | |
| da = drm_da * DRM_NUMWDS; /* compute dev addr */ | |
| for (i = 0; i < DRM_NUMWDS; i++, da++) { /* do transfer */ | |
| if (uptr->FUNC == DRM_READ) { /* read? */ | |
| if (MEM_ADDR_OK (drm_ma)) /* if !nxm */ | |
| M[drm_ma] = fbuf[da]; /* read word */ | |
| } | |
| else { /* write */ | |
| if ((drm_wlk >> (drm_da >> 4)) & 1) drm_err = 1; | |
| else { /* not locked */ | |
| fbuf[da] = M[drm_ma]; /* write word */ | |
| if (da >= uptr->hwmark) uptr->hwmark = da + 1; | |
| } | |
| } | |
| drm_ma = (drm_ma + 1) & 0177777; /* incr mem addr */ | |
| } | |
| drm_da = (drm_da + 1) & DRM_SMASK; /* incr dev addr */ | |
| SET_INT (DRM); /* set done */ | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat drm_reset (DEVICE *dptr) | |
| { | |
| drm_da = drm_ma = drm_err = 0; | |
| CLR_INT (DRM); /* clear done */ | |
| sim_cancel (&drm_unit); | |
| return SCPE_OK; | |
| } | |
| /* IORS routine */ | |
| int32 drm_iors (void) | |
| { | |
| return (TST_INT (DRM)? IOS_DRM: 0); | |
| } | |
| /* Bootstrap routine */ | |
| #define BOOT_START 02000 | |
| #define BOOT_LEN (sizeof (boot_rom) / sizeof (int)) | |
| static const int32 boot_rom[] = { | |
| 0750000, /* CLA ; dev, mem addr */ | |
| 0706006, /* DRLR ; load ma */ | |
| 0706106, /* DRSS ; load da, start */ | |
| 0706101, /* DRSF ; wait for done */ | |
| 0602003, /* JMP .-1 */ | |
| 0600000 /* JMP 0 ; enter boot */ | |
| }; | |
| t_stat drm_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| int32 i; | |
| extern int32 PC; | |
| if (drm_dib.dev != DEV_DRM) return STOP_NONSTD; /* non-std addr? */ | |
| for (i = 0; i < BOOT_LEN; i++) M[BOOT_START + i] = boot_rom[i]; | |
| PC = BOOT_START; | |
| return SCPE_OK; | |
| } |