| /* vax610_io.c: MicroVAX I Qbus IO simulator | |
| Copyright (c) 2011-2012, Matt Burke | |
| This module incorporates code from SimH, Copyright (c) 1998-2008, 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 | |
| THE AUTHOR(S) 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(s) of the author(s) shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from the author(s). | |
| qba Qbus adapter | |
| 15-Feb-2012 MB First Version | |
| */ | |
| #include "vax_defs.h" | |
| int32 int_req[IPL_HLVL] = { 0 }; /* intr, IPL 14-17 */ | |
| int32 autcon_enb = 1; /* autoconfig enable */ | |
| extern int32 PSL, SISR, trpirq, mem_err, hlt_pin; | |
| extern int32 p1; | |
| extern jmp_buf save_env; | |
| int32 eval_int (void); | |
| t_stat qba_reset (DEVICE *dptr); | |
| const char *qba_description (DEVICE *dptr); | |
| /* Qbus adapter data structures | |
| qba_dev QBA device descriptor | |
| qba_unit QBA units | |
| qba_reg QBA register list | |
| */ | |
| UNIT qba_unit = { UDATA (NULL, 0, 0) }; | |
| REG qba_reg[] = { | |
| { HRDATAD (IPL17, int_req[3], 32, "IPL 17 interrupt flags"), REG_RO }, | |
| { HRDATAD (IPL16, int_req[2], 32, "IPL 16 interrupt flags"), REG_RO }, | |
| { HRDATAD (IPL15, int_req[1], 32, "IPL 15 interrupt flags"), REG_RO }, | |
| { HRDATAD (IPL14, int_req[0], 32, "IPL 14 interrupt flags"), REG_RO }, | |
| { FLDATA (AUTOCON, autcon_enb, 0), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB qba_mod[] = { | |
| { MTAB_XTD|MTAB_VDV|MTAB_NMO, 0, "IOSPACE", NULL, | |
| NULL, &show_iospace, NULL, "Display I/O space address map" }, | |
| { MTAB_XTD|MTAB_VDV, 1, "AUTOCONFIG", "AUTOCONFIG", | |
| &set_autocon, &show_autocon, NULL, "Enable/Display autoconfiguration" }, | |
| { MTAB_XTD|MTAB_VDV, 0, NULL, "NOAUTOCONFIG", | |
| &set_autocon, NULL, NULL, "Disable autoconfiguration" }, | |
| { 0 } | |
| }; | |
| DEVICE qba_dev = { | |
| "QBUS", &qba_unit, qba_reg, qba_mod, | |
| 1, 16, 4, 2, 16, 16, | |
| NULL, NULL, &qba_reset, | |
| NULL, NULL, NULL, | |
| NULL, DEV_QBUS, 0, NULL, NULL, NULL, NULL, NULL, NULL, | |
| &qba_description | |
| }; | |
| /* IO page dispatches */ | |
| t_stat (*iodispR[IOPAGESIZE >> 1])(int32 *dat, int32 ad, int32 md); | |
| t_stat (*iodispW[IOPAGESIZE >> 1])(int32 dat, int32 ad, int32 md); | |
| /* Interrupt request to interrupt action map */ | |
| int32 (*int_ack[IPL_HLVL][32])(void); /* int ack routines */ | |
| /* Interrupt request to vector map */ | |
| int32 int_vec[IPL_HLVL][32]; /* int req to vector */ | |
| /* The KA610 handles errors in I/O space as follows | |
| - read: machine check | |
| - write: machine check (?) | |
| */ | |
| int32 ReadQb (uint32 pa) | |
| { | |
| int32 idx, val; | |
| idx = (pa & IOPAGEMASK) >> 1; | |
| if (iodispR[idx]) { | |
| iodispR[idx] (&val, pa, READ); | |
| return val; | |
| } | |
| MACH_CHECK (MCHK_READ); | |
| return 0; | |
| } | |
| void WriteQb (uint32 pa, int32 val, int32 mode) | |
| { | |
| int32 idx; | |
| idx = (pa & IOPAGEMASK) >> 1; | |
| if (iodispW[idx]) { | |
| iodispW[idx] (val, pa, mode); | |
| return; | |
| } | |
| MACH_CHECK (MCHK_WRITE); /* FIXME: is this correct? */ | |
| return; | |
| } | |
| /* ReadIO - read I/O space - aligned access | |
| Inputs: | |
| pa = physical address | |
| lnt = length (BWLQ) | |
| Output: | |
| longword of data | |
| */ | |
| int32 ReadIO (uint32 pa, int32 lnt) | |
| { | |
| int32 iod; | |
| iod = ReadQb (pa); /* wd from Qbus */ | |
| if (lnt < L_LONG) /* bw? position */ | |
| iod = iod << ((pa & 2)? 16: 0); | |
| else iod = (ReadQb (pa + 2) << 16) | iod; /* lw, get 2nd wd */ | |
| SET_IRQL; | |
| return iod; | |
| } | |
| /* ReadIOU - read I/O space - unaligned access | |
| Inputs: | |
| pa = physical address | |
| lnt = length (1, 2, 3 bytes) | |
| Output: | |
| data, not shifted | |
| Note that all of these cases are presented to the existing aligned IO routine: | |
| bo = 0, byte, word, or longword length | |
| bo = 2, word | |
| bo = 1, 2, 3, byte length | |
| All the other cases are end up at ReadIOU and WriteIOU, and they must turn | |
| the request into the exactly correct number of Qbus accesses AND NO MORE, | |
| because Qbus reads can have side-effects, and word read-modify-write is NOT | |
| the same as a byte write. | |
| Note that the sum of the pa offset and the length cannot be greater than 4. | |
| The read cases are: | |
| bo = 0, byte or word - read one word | |
| bo = 0, tribyte - read two words | |
| bo = 1, byte - read one word | |
| bo = 1, word or tribyte - read two words | |
| bo = 2, byte or word - read one word | |
| bo = 3, byte - read one word | |
| */ | |
| int32 ReadIOU (uint32 pa, int32 lnt) | |
| { | |
| int32 iod; | |
| iod = ReadQb (pa); /* wd from Qbus */ | |
| if ((lnt + (pa & 1)) <= 2) /* byte or (word & even) */ | |
| iod = iod << ((pa & 2)? 16: 0); /* one op */ | |
| else iod = (ReadQb (pa + 2) << 16) | iod; /* two ops, get 2nd wd */ | |
| SET_IRQL; | |
| return iod; | |
| } | |
| /* WriteIO - write I/O space - aligned access | |
| Inputs: | |
| pa = physical address | |
| val = data to write, right justified in 32b longword | |
| lnt = length (BWLQ) | |
| Outputs: | |
| none | |
| */ | |
| void WriteIO (uint32 pa, int32 val, int32 lnt) | |
| { | |
| if (lnt == L_BYTE) | |
| WriteQb (pa, val, WRITEB); | |
| else if (lnt == L_WORD) | |
| WriteQb (pa, val, WRITE); | |
| else { | |
| WriteQb (pa, val & 0xFFFF, WRITE); | |
| WriteQb (pa + 2, (val >> 16) & 0xFFFF, WRITE); | |
| } | |
| SET_IRQL; | |
| return; | |
| } | |
| /* WriteIOU - write I/O space | |
| Inputs: | |
| pa = physical address | |
| val = data to write, right justified in 32b longword | |
| lnt = length (1, 2, or 3 bytes) | |
| Outputs: | |
| none | |
| The write cases are: | |
| bo = x, lnt = byte - write one byte | |
| bo = 0 or 2, lnt = word - write one word | |
| bo = 1, lnt = word - write two bytes | |
| bo = 0, lnt = tribyte - write word, byte | |
| bo = 1, lnt = tribyte - write byte, word | |
| */ | |
| void WriteIOU (uint32 pa, int32 val, int32 lnt) | |
| { | |
| switch (lnt) { | |
| case L_BYTE: /* byte */ | |
| WriteQb (pa, val & BMASK, WRITEB); | |
| break; | |
| case L_WORD: /* word */ | |
| if (pa & 1) { /* odd addr? */ | |
| WriteQb (pa, val & BMASK, WRITEB); | |
| WriteQb (pa + 1, (val >> 8) & BMASK, WRITEB); | |
| } | |
| else WriteQb (pa, val & WMASK, WRITE); | |
| break; | |
| case 3: /* tribyte */ | |
| if (pa & 1) { /* odd addr? */ | |
| WriteQb (pa, val & BMASK, WRITEB); /* byte then word */ | |
| WriteQb (pa + 1, (val >> 8) & WMASK, WRITE); | |
| } | |
| else { /* even */ | |
| WriteQb (pa, val & WMASK, WRITE); /* word then byte */ | |
| WriteQb (pa + 2, (val >> 16) & BMASK, WRITEB); | |
| } | |
| break; | |
| } | |
| SET_IRQL; | |
| return; | |
| } | |
| /* Find highest priority outstanding interrupt */ | |
| int32 eval_int (void) | |
| { | |
| int32 ipl = PSL_GETIPL (PSL); | |
| int32 i, t; | |
| static const int32 sw_int_mask[IPL_SMAX] = { | |
| 0xFFFE, 0xFFFC, 0xFFF8, 0xFFF0, /* 0 - 3 */ | |
| 0xFFE0, 0xFFC0, 0xFF80, 0xFF00, /* 4 - 7 */ | |
| 0xFE00, 0xFC00, 0xF800, 0xF000, /* 8 - B */ | |
| 0xE000, 0xC000, 0x8000 /* C - E */ | |
| }; | |
| if (hlt_pin) /* hlt pin int */ | |
| return IPL_HLTPIN; | |
| if ((ipl < IPL_MEMERR) && mem_err) /* mem err int */ | |
| return IPL_MEMERR; | |
| for (i = IPL_HMAX; i >= IPL_HMIN; i--) { /* chk hwre int */ | |
| if (i <= ipl) /* at ipl? no int */ | |
| return 0; | |
| if (int_req[i - IPL_HMIN]) /* req != 0? int */ | |
| return i; | |
| } | |
| if (ipl >= IPL_SMAX) /* ipl >= sw max? */ | |
| return 0; | |
| if ((t = SISR & sw_int_mask[ipl]) == 0) /* eligible req */ | |
| return 0; | |
| for (i = IPL_SMAX; i > ipl; i--) { /* check swre int */ | |
| if ((t >> i) & 1) /* req != 0? int */ | |
| return i; | |
| } | |
| return 0; | |
| } | |
| /* Return vector for highest priority hardware interrupt at IPL lvl */ | |
| int32 get_vector (int32 lvl) | |
| { | |
| int32 i; | |
| int32 l = lvl - IPL_HMIN; | |
| if (lvl == IPL_MEMERR) { /* mem error? */ | |
| mem_err = 0; | |
| return SCB_MEMERR; | |
| } | |
| if (lvl > IPL_HMAX) { /* error req lvl? */ | |
| ABORT (STOP_UIPL); /* unknown intr */ | |
| } | |
| for (i = 0; int_req[l] && (i < 32); i++) { | |
| if ((int_req[l] >> i) & 1) { | |
| int_req[l] = int_req[l] & ~(1u << i); | |
| if (int_ack[l][i]) | |
| return int_ack[l][i](); | |
| return int_vec[l][i]; | |
| } | |
| } | |
| return 0; | |
| } | |
| /* Reset I/O bus */ | |
| void ioreset_wr (int32 data) | |
| { | |
| reset_all (5); /* from qba on... */ | |
| return; | |
| } | |
| /* Reset Qbus */ | |
| t_stat qba_reset (DEVICE *dptr) | |
| { | |
| int32 i; | |
| for (i = 0; i < IPL_HLVL; i++) | |
| int_req[i] = 0; | |
| return SCPE_OK; | |
| } | |
| const char *qba_description (DEVICE *dptr) | |
| { | |
| return "Qbus adapter"; | |
| } | |
| /* Qbus I/O buffer routines, aligned access | |
| Map_ReadB - fetch byte buffer from memory | |
| Map_ReadW - fetch word buffer from memory | |
| Map_WriteB - store byte buffer into memory | |
| Map_WriteW - store word buffer into memory | |
| */ | |
| int32 Map_ReadB (uint32 ba, int32 bc, uint8 *buf) | |
| { | |
| int32 i; | |
| uint32 ma = ba & 0x3FFFFF; | |
| uint32 dat; | |
| if ((ba | bc) & 03) { /* check alignment */ | |
| for (i = 0; i < bc; i++, buf++) { /* by bytes */ | |
| *buf = ReadB (ma); | |
| ma = ma + 1; | |
| } | |
| } | |
| else { | |
| for (i = 0; i < bc; i = i + 4, buf++) { /* by longwords */ | |
| dat = ReadL (ma); /* get lw */ | |
| *buf++ = dat & BMASK; /* low 8b */ | |
| *buf++ = (dat >> 8) & BMASK; /* next 8b */ | |
| *buf++ = (dat >> 16) & BMASK; /* next 8b */ | |
| *buf = (dat >> 24) & BMASK; | |
| ma = ma + 4; | |
| } | |
| } | |
| return 0; | |
| } | |
| int32 Map_ReadW (uint32 ba, int32 bc, uint16 *buf) | |
| { | |
| int32 i; | |
| uint32 ma = ba & 0x3FFFFF; | |
| uint32 dat; | |
| ba = ba & ~01; | |
| bc = bc & ~01; | |
| if ((ba | bc) & 03) { /* check alignment */ | |
| for (i = 0; i < bc; i = i + 2, buf++) { /* by words */ | |
| *buf = ReadW (ma); | |
| ma = ma + 2; | |
| } | |
| } | |
| else { | |
| for (i = 0; i < bc; i = i + 4, buf++) { /* by longwords */ | |
| dat = ReadL (ma); /* get lw */ | |
| *buf++ = dat & WMASK; /* low 16b */ | |
| *buf = (dat >> 16) & WMASK; /* high 16b */ | |
| ma = ma + 4; | |
| } | |
| } | |
| return 0; | |
| } | |
| int32 Map_WriteB (uint32 ba, int32 bc, uint8 *buf) | |
| { | |
| int32 i; | |
| uint32 ma = ba & 0x3FFFFF; | |
| uint32 dat; | |
| if ((ba | bc) & 03) { /* check alignment */ | |
| for (i = 0; i < bc; i++, buf++) { /* by bytes */ | |
| WriteB (ma, *buf); | |
| ma = ma + 1; | |
| } | |
| } | |
| else { | |
| for (i = 0; i < bc; i = i + 4, buf++) { /* by longwords */ | |
| dat = (uint32) *buf++; /* get low 8b */ | |
| dat = dat | (((uint32) *buf++) << 8); /* merge next 8b */ | |
| dat = dat | (((uint32) *buf++) << 16); /* merge next 8b */ | |
| dat = dat | (((uint32) *buf) << 24); /* merge hi 8b */ | |
| WriteL (ma, dat); /* store lw */ | |
| ma = ma + 4; | |
| } | |
| } | |
| return 0; | |
| } | |
| int32 Map_WriteW (uint32 ba, int32 bc, uint16 *buf) | |
| { | |
| int32 i; | |
| uint32 ma = ba & 0x3FFFFF; | |
| uint32 dat; | |
| ba = ba & ~01; | |
| bc = bc & ~01; | |
| if ((ba | bc) & 03) { /* check alignment */ | |
| for (i = 0; i < bc; i = i + 2, buf++) { /* by words */ | |
| WriteW (ma, *buf); | |
| ma = ma + 2; | |
| } | |
| } | |
| else { | |
| for (i = 0; i < bc; i = i + 4, buf++) { /* by longwords */ | |
| dat = (uint32) *buf++; /* get low 16b */ | |
| dat = dat | (((uint32) *buf) << 16); /* merge hi 16b */ | |
| WriteL (ma, dat); /* store lw */ | |
| ma = ma + 4; | |
| } | |
| } | |
| return 0; | |
| } | |
| /* Build dib_tab from device list */ | |
| t_stat build_dib_tab (void) | |
| { | |
| int32 i; | |
| DEVICE *dptr; | |
| DIB *dibp; | |
| t_stat r; | |
| init_ubus_tab (); /* init bus tables */ | |
| for (i = 0; (dptr = sim_devices[i]) != NULL; i++) { /* loop thru dev */ | |
| dibp = (DIB *) dptr->ctxt; /* get DIB */ | |
| if (dibp && !(dptr->flags & DEV_DIS)) { /* defined, enabled? */ | |
| if ((r = build_ubus_tab (dptr, dibp))) /* add to bus tab */ | |
| return r; | |
| } /* end if enabled */ | |
| } /* end for */ | |
| return SCPE_OK; | |
| } |