| /* hp2100_cpu3.c: HP 2100/1000 FFP/DBI instructions | |
| Copyright (c) 2005-2008, J. David Bryan | |
| 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 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 the author 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. | |
| CPU3 Fast FORTRAN and Double Integer instructions | |
| 27-Feb-08 JDB Added DBI self-test instruction | |
| 23-Oct-07 JDB Fixed unsigned-divide bug in .DDI | |
| 17-Oct-07 JDB Fixed unsigned-multiply bug in .DMP | |
| 16-Oct-06 JDB Calls FPP for extended-precision math | |
| 12-Oct-06 JDB Altered DBLE, DDINT for F-Series FFP compatibility | |
| 26-Sep-06 JDB Moved from hp2100_cpu1.c to simplify extensions | |
| 09-Aug-06 JDB Added double-integer instruction set | |
| 18-Feb-05 JDB Add 2100/21MX Fast FORTRAN Processor instructions | |
| Primary references: | |
| - HP 1000 M/E/F-Series Computers Technical Reference Handbook | |
| (5955-0282, Mar-1980) | |
| - HP 1000 M/E/F-Series Computers Engineering and Reference Documentation | |
| (92851-90001, Mar-1981) | |
| - Macro/1000 Reference Manual (92059-90001, Dec-1992) | |
| Additional references are listed with the associated firmware | |
| implementations, as are the HP option model numbers pertaining to the | |
| applicable CPUs. | |
| */ | |
| #include "hp2100_defs.h" | |
| #include "hp2100_cpu.h" | |
| #include "hp2100_cpu1.h" | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| #include "hp2100_fp1.h" | |
| #else /* int64 support unavailable */ | |
| #include "hp2100_fp.h" | |
| #endif /* end of int64 support */ | |
| t_stat cpu_ffp (uint32 IR, uint32 intrq); /* Fast FORTRAN Processor */ | |
| t_stat cpu_dbi (uint32 IR, uint32 intrq); /* Double-Integer instructions */ | |
| /* Fast FORTRAN Processor. | |
| The Fast FORTRAN Processor (FFP) is a set of FORTRAN language accelerators | |
| and extended-precision (three-word) floating point routines. Although the | |
| FFP is an option for the 2100 and later CPUs, each implements the FFP in a | |
| slightly different form. | |
| Option implementation by CPU was as follows: | |
| 2114 2115 2116 2100 1000-M 1000-E 1000-F | |
| ------ ------ ------ ------ ------ ------ ------ | |
| N/A N/A N/A 12907A 12977B 13306B std | |
| The instruction codes are mapped to routines as follows: | |
| Instr. 2100 1000-M 1000-E 1000-F Instr. 2100 1000-M 1000-E 1000-F | |
| ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ | |
| 105200 -- [nop] [nop] [test] 105220 .XFER .XFER .XFER .XFER | |
| 105201 DBLE DBLE DBLE DBLE 105221 .GOTO .GOTO .GOTO .GOTO | |
| 105202 SNGL SNGL SNGL SNGL 105222 ..MAP ..MAP ..MAP ..MAP | |
| 105203 .XMPY .XMPY .XMPY .DNG 105223 .ENTR .ENTR .ENTR .ENTR | |
| 105204 .XDIV .XDIV .XDIV .DCO 105224 .ENTP .ENTP .ENTP .ENTP | |
| 105205 .DFER .DFER .DFER .DFER 105225 -- .PWR2 .PWR2 .PWR2 | |
| 105206 -- .XPAK .XPAK .XPAK 105226 -- .FLUN .FLUN .FLUN | |
| 105207 -- XADD XADD .BLE 105227 $SETP $SETP $SETP $SETP | |
| 105210 -- XSUB XSUB .DIN 105230 -- .PACK .PACK .PACK | |
| 105211 -- XMPY XMPY .DDE 105231 -- -- .CFER .CFER | |
| 105212 -- XDIV XDIV .DIS 105232 -- -- -- ..FCM | |
| 105213 .XADD .XADD .XADD .DDS 105233 -- -- -- ..TCM | |
| 105214 .XSUB .XSUB .XSUB .NGL 105234 -- -- -- -- | |
| 105215 -- .XCOM .XCOM .XCOM 105235 -- -- -- -- | |
| 105216 -- ..DCM ..DCM ..DCM 105236 -- -- -- -- | |
| 105217 -- DDINT DDINT DDINT 105237 -- -- -- -- | |
| The F-Series maps different instructions to several of the standard FFP | |
| opcodes. We first look for these and dispatch them appropriately before | |
| falling into the handler for the common instructions. | |
| The math functions use the F-Series FPP for implementation. The FPP requires | |
| that the host compiler support 64-bit integers. Therefore, if 64-bit | |
| integers are not available, the math instructions of the FFP are disabled. | |
| We allow this partial implementation as an aid in running systems generated | |
| for the FFP. Most system programs did not use the math instructions, but | |
| almost all use .ENTR. Supporting the latter even on systems that do not | |
| support the former still allows such systems to boot. | |
| Notes: | |
| 1. The "$SETP" instruction is sometimes listed as ".SETP" in the | |
| documentation. | |
| 2. Extended-precision arithmetic routines (e.g., .XMPY) exist on the | |
| 1000-F, but they are assigned instruction codes in the single-precision | |
| floating-point module range. They are replaced by several double | |
| integer instructions, which we dispatch to the double integer handler. | |
| 3. The software implementation of ..MAP supports 1-, 2-, or 3-dimensional | |
| arrays, designated by setting A = -1, 0, and +1, respectively. The | |
| firmware implementation supports only 2- and 3-dimensional access. | |
| 4. The documentation for ..MAP for the 2100 FFP shows A = 0 or -1 for two | |
| or three dimensions, respectively, but the 1000 FFP shows A = 0 or +1. | |
| The firmware actually only checks the LSB of A. | |
| 5. The .DFER and .XFER implementations for the 2100 FFP return X+4 and Y+4 | |
| in the A and B registers, whereas the 1000 FFP returns X+3 and Y+3. | |
| 6. The .XFER implementation for the 2100 FFP returns to P+2, whereas the | |
| 1000 implementation returns to P+1. | |
| 7. The firmware implementations of DBLE, .BLE, and DDINT clear the overflow | |
| flag. The software implementations do not change overflow. | |
| 8. The M/E-Series FFP arithmetic instructions (.XADD, etc.) return negative | |
| infinity on negative overflow and positive infinity on positive | |
| overflow. The equivalent F-Series instructions return positive infinity | |
| on both. | |
| Additional references: | |
| - DOS/RTE Relocatable Library Reference Manual (24998-90001, Oct-1981) | |
| - Implementing the HP 2100 Fast FORTRAN Processor (12907-90010, Nov-1974) | |
| */ | |
| static const OP_PAT op_ffp_f[32] = { /* patterns for F-Series only */ | |
| OP_N, OP_AAF, OP_AX, OP_N, /* [tst] DBLE SNGL .DNG */ | |
| OP_N, OP_AA, OP_A, OP_AAF, /* .DCO .DFER .XPAK .BLE */ | |
| OP_N, OP_N, OP_N, OP_N, /* .DIN .DDE .DIS .DDS */ | |
| OP_AT, OP_A, OP_A, OP_AAX, /* .NGL .XCOM ..DCM DDINT */ | |
| OP_N, OP_AK, OP_KKKK, OP_A, /* .XFER .GOTO ..MAP .ENTR */ | |
| OP_A, OP_RK, OP_R, OP_K, /* .ENTP .PWR2 .FLUN $SETP */ | |
| OP_RC, OP_AA, OP_R, OP_A, /* .PACK .CFER ..FCM ..TCM */ | |
| OP_N, OP_N, OP_N, OP_N /* --- --- --- --- */ | |
| }; | |
| static const OP_PAT op_ffp_e[32] = { /* patterns for 2100/M/E-Series */ | |
| OP_N, OP_AAF, OP_AX, OP_AXX, /* [nop] DBLE SNGL .XMPY */ | |
| OP_AXX, OP_AA, OP_A, OP_AAXX, /* .XDIV .DFER .XPAK XADD */ | |
| OP_AAXX, OP_AAXX, OP_AAXX, OP_AXX, /* XSUB XMPY XDIV .XADD */ | |
| OP_AXX, OP_A, OP_A, OP_AAX, /* .XSUB .XCOM ..DCM DDINT */ | |
| OP_N, OP_AK, OP_KKKK, OP_A, /* .XFER .GOTO ..MAP .ENTR */ | |
| OP_A, OP_RK, OP_R, OP_K, /* .ENTP .PWR2 .FLUN $SETP */ | |
| OP_RC, OP_AA, OP_N, OP_N, /* .PACK .CFER --- --- */ | |
| OP_N, OP_N, OP_N, OP_N /* --- --- --- --- */ | |
| }; | |
| t_stat cpu_ffp (uint32 IR, uint32 intrq) | |
| { | |
| OP fpop; | |
| OPS op, op2; | |
| uint32 entry; | |
| uint32 j, sa, sb, sc, da, dc, ra, MA; | |
| int32 expon; | |
| t_stat reason = SCPE_OK; | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| int32 i; | |
| #endif /* end of int64 support */ | |
| if ((cpu_unit.flags & UNIT_FFP) == 0) /* FFP option installed? */ | |
| return stop_inst; | |
| entry = IR & 037; /* mask to entry point */ | |
| if (UNIT_CPU_MODEL != UNIT_1000_F) { /* 2100/M/E-Series? */ | |
| if (op_ffp_e[entry] != OP_N) | |
| if (reason = cpu_ops (op_ffp_e[entry], op, intrq)) /* get instruction operands */ | |
| return reason; | |
| } | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| else { /* F-Series */ | |
| if (op_ffp_f[entry] != OP_N) | |
| if (reason = cpu_ops (op_ffp_f[entry], op, intrq)) /* get instruction operands */ | |
| return reason; | |
| switch (entry) { /* decode IR<4:0> */ | |
| case 000: /* [tst] 105200 (OP_N) */ | |
| XR = 4; /* firmware revision */ | |
| SR = 0102077; /* test passed code */ | |
| AR = 0; /* test clears A/B */ | |
| BR = 0; | |
| PC = (PC + 1) & VAMASK; /* P+2 return for firmware w/DBI */ | |
| return reason; | |
| case 003: /* .DNG 105203 (OP_N) */ | |
| return cpu_dbi (0105323, intrq); /* remap to double int handler */ | |
| case 004: /* .DCO 105204 (OP_N) */ | |
| return cpu_dbi (0105324, intrq); /* remap to double int handler */ | |
| case 007: /* .BLE 105207 (OP_AAF) */ | |
| O = fp_cvt (&op[2], fp_f, fp_t); /* convert value and clear overflow */ | |
| WriteOp (op[1].word, op[2], fp_t); /* write double-precision value */ | |
| return reason; | |
| case 010: /* .DIN 105210 (OP_N) */ | |
| return cpu_dbi (0105330, intrq); /* remap to double int handler */ | |
| case 011: /* .DDE 105211 (OP_N) */ | |
| return cpu_dbi (0105331, intrq); /* remap to double int handler */ | |
| case 012: /* .DIS 105212 (OP_N) */ | |
| return cpu_dbi (0105332, intrq); /* remap to double int handler */ | |
| case 013: /* .DDS 105213 (OP_N) */ | |
| return cpu_dbi (0105333, intrq); /* remap to double int handler */ | |
| case 014: /* .NGL 105214 (OP_AT) */ | |
| O = fp_cvt (&op[1], fp_t, fp_f); /* convert value */ | |
| AR = op[1].fpk[0]; /* move MSB to A */ | |
| BR = op[1].fpk[1]; /* move LSB to B */ | |
| return reason; | |
| case 032: /* ..FCM 105232 (OP_R) */ | |
| O = fp_pcom (&op[0], fp_f); /* complement value */ | |
| AR = op[0].fpk[0]; /* return result */ | |
| BR = op[0].fpk[1]; /* to A/B registers */ | |
| return reason; | |
| case 033: /* ..TCM 105233 (OP_A) */ | |
| fpop = ReadOp (op[0].word, fp_t); /* read 4-word value */ | |
| O = fp_pcom (&fpop, fp_t); /* complement it */ | |
| WriteOp (op[0].word, fpop, fp_t); /* write 4-word value */ | |
| return reason; | |
| } /* fall thru if not special to F */ | |
| } | |
| #endif /* end of int64 support */ | |
| switch (entry) { /* decode IR<4:0> */ | |
| /* FFP module 1 */ | |
| case 000: /* [nop] 105200 (OP_N) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 M/E-series */ | |
| return stop_inst; /* trap if not */ | |
| break; | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| case 001: /* DBLE 105201 (OP_AAF) */ | |
| O = fp_cvt (&op[2], fp_f, fp_x); /* convert value and clear overflow */ | |
| WriteOp (op[1].word, op[2], fp_x); /* write extended-precision value */ | |
| break; | |
| case 002: /* SNGL 105202 (OP_AX) */ | |
| O = fp_cvt (&op[1], fp_x, fp_f); /* convert value */ | |
| AR = op[1].fpk[0]; /* move MSB to A */ | |
| BR = op[1].fpk[1]; /* move LSB to B */ | |
| break; | |
| case 003: /* .XMPY 105203 (OP_AXX) */ | |
| i = 0; /* params start at op[0] */ | |
| goto XMPY; /* process as XMPY */ | |
| case 004: /* .XDIV 105204 (OP_AXX) */ | |
| i = 0; /* params start at op[0] */ | |
| goto XDIV; /* process as XDIV */ | |
| #endif /* end of int64 support */ | |
| case 005: /* .DFER 105205 (OP_AA) */ | |
| BR = op[0].word; /* get destination address */ | |
| AR = op[1].word; /* get source address */ | |
| goto XFER; /* do transfer */ | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| case 006: /* .XPAK 105206 (OP_A) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| fpop = ReadOp (op[0].word, fp_x); /* read unpacked */ | |
| O = fp_nrpack (&fpop, fpop, (int16) AR, fp_x); /* nrm/rnd/pack mantissa, exponent */ | |
| WriteOp (op[0].word, fpop, fp_x); /* write result */ | |
| break; | |
| case 007: /* XADD 105207 (OP_AAXX) */ | |
| i = 1; /* params start at op[1] */ | |
| XADD: /* enter here from .XADD */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| O = fp_exec (001, &fpop, op[i + 1], op[i + 2]); /* three-word add */ | |
| WriteOp (op[i].word, fpop, fp_x); /* write sum */ | |
| break; | |
| case 010: /* XSUB 105210 (OP_AAXX) */ | |
| i = 1; /* params start at op[1] */ | |
| XSUB: /* enter here from .XSUB */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| O = fp_exec (021, &fpop, op[i + 1], op[i + 2]); /* three-word subtract */ | |
| WriteOp (op[i].word, fpop, fp_x); /* write difference */ | |
| break; | |
| case 011: /* XMPY 105211 (OP_AAXX) */ | |
| i = 1; /* params start at op[1] */ | |
| XMPY: /* enter here from .XMPY */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| O = fp_exec (041, &fpop, op[i + 1], op[i + 2]); /* three-word multiply */ | |
| WriteOp (op[i].word, fpop, fp_x); /* write product */ | |
| break; | |
| case 012: /* XDIV 105212 (OP_AAXX) */ | |
| i = 1; /* params start at op[1] */ | |
| XDIV: /* enter here from .XDIV */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| O = fp_exec (061, &fpop, op[i + 1], op[i + 2]); /* three-word divide */ | |
| WriteOp (op[i].word, fpop, fp_x); /* write quotient */ | |
| break; | |
| case 013: /* .XADD 105213 (OP_AXX) */ | |
| i = 0; /* params start at op[0] */ | |
| goto XADD; /* process as XADD */ | |
| case 014: /* .XSUB 105214 (OP_AXX) */ | |
| i = 0; /* params start at op[0] */ | |
| goto XSUB; /* process as XSUB */ | |
| case 015: /* .XCOM 105215 (OP_A) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| fpop = ReadOp (op[0].word, fp_x); /* read unpacked */ | |
| AR = fp_ucom (&fpop, fp_x); /* complement and rtn exp adj */ | |
| WriteOp (op[0].word, fpop, fp_x); /* write result */ | |
| break; | |
| case 016: /* ..DCM 105216 (OP_A) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| fpop = ReadOp (op[0].word, fp_x); /* read operand */ | |
| O = fp_pcom (&fpop, fp_x); /* complement (can't ovf neg) */ | |
| WriteOp (op[0].word, fpop, fp_x); /* write result */ | |
| break; | |
| case 017: /* DDINT 105217 (OP_AAX) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| if (intrq) { /* interrupt pending? */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| O = fp_trun (&fpop, op[2], fp_x); /* truncate operand (can't ovf) */ | |
| WriteOp (op[1].word, fpop, fp_x); /* write result */ | |
| break; | |
| #endif /* end of int64 support */ | |
| /* FFP module 2 */ | |
| case 020: /* .XFER 105220 (OP_N) */ | |
| if (UNIT_CPU_TYPE == UNIT_TYPE_2100) | |
| PC = (PC + 1) & VAMASK; /* 2100 .XFER returns to P+2 */ | |
| XFER: /* enter here from .DFER */ | |
| sc = 3; /* set count for 3-wd xfer */ | |
| goto CFER; /* do transfer */ | |
| case 021: /* .GOTO 105221 (OP_AK) */ | |
| if ((int16) op[1].word < 1) /* index < 1? */ | |
| op[1].word = 1; /* reset min */ | |
| sa = PC + op[1].word - 1; /* point to jump target */ | |
| if (sa >= op[0].word) /* must be <= last target */ | |
| sa = op[0].word - 1; | |
| da = ReadW (sa); /* get jump target */ | |
| if (reason = resolve (da, &MA, intrq)) { /* resolve indirects */ | |
| PC = err_PC; /* irq restarts instruction */ | |
| break; | |
| } | |
| mp_dms_jmp (MA); /* validate jump addr */ | |
| PCQ_ENTRY; /* record last PC */ | |
| PC = MA; /* jump */ | |
| BR = op[0].word; /* (for 2100 FFP compat) */ | |
| break; | |
| case 022: /* ..MAP 105222 (OP_KKKK) */ | |
| op[1].word = op[1].word - 1; /* decrement 1st subscr */ | |
| if ((AR & 1) == 0) /* 2-dim access? */ | |
| op[1].word = op[1].word + /* compute element offset */ | |
| (op[2].word - 1) * op[3].word; | |
| else { /* 3-dim access */ | |
| if (reason = cpu_ops (OP_KK, op2, intrq)) { /* get 1st, 2nd ranges */ | |
| PC = err_PC; /* irq restarts instruction */ | |
| break; | |
| } | |
| op[1].word = op[1].word + /* offset */ | |
| ((op[3].word - 1) * op2[1].word + | |
| op[2].word - 1) * op2[0].word; | |
| } | |
| AR = (op[0].word + op[1].word * BR) & DMASK; /* return element address */ | |
| break; | |
| case 023: /* .ENTR 105223 (OP_A) */ | |
| MA = PC - 3; /* get addr of entry point */ | |
| ENTR: /* enter here from .ENTP */ | |
| da = op[0].word; /* get addr of 1st formal */ | |
| dc = MA - da; /* get count of formals */ | |
| sa = ReadW (MA); /* get addr of return point */ | |
| ra = ReadW (sa++); /* get rtn, ptr to 1st actual */ | |
| WriteW (MA, ra); /* stuff rtn into caller's ent */ | |
| sc = ra - sa; /* get count of actuals */ | |
| if (sc > dc) /* use min (actuals, formals) */ | |
| sc = dc; | |
| for (j = 0; j < sc; j++) { | |
| MA = ReadW (sa++); /* get addr of actual */ | |
| if (reason = resolve (MA, &MA, intrq)) { /* resolve indirect */ | |
| PC = err_PC; /* irq restarts instruction */ | |
| break; | |
| } | |
| WriteW (da++, MA); /* put addr into formal */ | |
| } | |
| AR = ra; /* return address */ | |
| BR = da; /* addr of 1st unused formal */ | |
| break; | |
| case 024: /* .ENTP 105224 (OP_A) */ | |
| MA = PC - 5; /* get addr of entry point */ | |
| goto ENTR; | |
| case 025: /* .PWR2 105225 (OP_RK) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| fp_unpack (&fpop, &expon, op[0], fp_f); /* unpack value */ | |
| expon = expon + (int16) (op[1].word); /* multiply by 2**n */ | |
| fp_pack (&fpop, fpop, expon, fp_f); /* repack value */ | |
| AR = fpop.fpk[0]; /* return result */ | |
| BR = fpop.fpk[1]; /* to A/B registers */ | |
| break; | |
| case 026: /* .FLUN 105226 (OP_R) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| fp_unpack (&fpop, &expon, op[0], fp_f); /* unpack value */ | |
| AR = (int16) expon; /* return expon to A */ | |
| BR = fpop.fpk[1]; /* and low mant to B */ | |
| break; | |
| case 027: /* $SETP 105227 (OP_K) */ | |
| j = sa = AR; /* save initial value */ | |
| sb = BR; /* save initial address */ | |
| AR = 0; /* AR will return = 0 */ | |
| BR = BR & VAMASK; /* addr must be direct */ | |
| do { | |
| WriteW (BR, j); /* write value to address */ | |
| j = (j + 1) & DMASK; /* incr value */ | |
| BR = (BR + 1) & VAMASK; /* incr address */ | |
| op[0].word = op[0].word - 1; /* decr count */ | |
| if (op[0].word && intrq) { /* more and intr? */ | |
| AR = sa; /* restore A */ | |
| BR = sb; /* restore B */ | |
| PC = err_PC; /* restart instruction */ | |
| break; | |
| } | |
| } | |
| while (op[0].word != 0); /* loop until count exhausted */ | |
| break; | |
| case 030: /* .PACK 105230 (OP_RC) */ | |
| if (UNIT_CPU_TYPE != UNIT_TYPE_1000) /* must be 1000 */ | |
| return stop_inst; /* trap if not */ | |
| O = fp_nrpack (&fpop, op[0], /* nrm/rnd/pack value */ | |
| (int16) (op[1].word), fp_f); | |
| AR = fpop.fpk[0]; /* return result */ | |
| BR = fpop.fpk[1]; /* to A/B registers */ | |
| break; | |
| case 031: /* .CFER 105231 (OP_AA) */ | |
| if ((UNIT_CPU_MODEL != UNIT_1000_E) && /* must be 1000 E-series */ | |
| (UNIT_CPU_MODEL != UNIT_1000_F)) /* or 1000 F-series */ | |
| return stop_inst; /* trap if not */ | |
| BR = op[0].word; /* get destination address */ | |
| AR = op[1].word; /* get source address */ | |
| sc = 4; /* set for 4-wd xfer */ | |
| CFER: /* enter here from .XFER */ | |
| for (j = 0; j < sc; j++) { /* xfer loop */ | |
| WriteW (BR, ReadW (AR)); /* transfer word */ | |
| AR = (AR + 1) & VAMASK; /* bump source addr */ | |
| BR = (BR + 1) & VAMASK; /* bump destination addr */ | |
| } | |
| E = 0; /* routine clears E */ | |
| if (UNIT_CPU_TYPE == UNIT_TYPE_2100) { /* 2100 (and .DFER/.XFER)? */ | |
| AR = (AR + 1) & VAMASK; /* 2100 FFP returns X+4, Y+4 */ | |
| BR = (BR + 1) & VAMASK; | |
| } | |
| break; | |
| default: /* others undefined */ | |
| reason = stop_inst; | |
| } | |
| return reason; | |
| } | |
| /* Double-Integer Instructions. | |
| The double-integer instructions were added to the HP instruction set at | |
| revision 1920 of the 1000-F. They were immediately adopted in a number of HP | |
| software products, most notably the RTE file management package (FMP) | |
| routines. As these routines are used in nearly every RTE program, F-Series | |
| programs were almost always a few hundred bytes smaller than their M- and | |
| E-Series counterparts. This became significant as RTE continued to grow in | |
| size, and some customer programs ran out of address space on E-Series | |
| machines. | |
| While HP never added double-integer instructions to the standard E-Series, a | |
| product from the HP "specials group," HP 93585A, provided microcoded | |
| replacements for the E-Series. This could provide just enough address-space | |
| savings to allow programs to load in E-Series systems, in addition to | |
| accelerating these common operations. | |
| There was no equivalent M-Series microcode, due to the limited micromachine | |
| address space on that system. | |
| Option implementation by CPU was as follows: | |
| 2114 2115 2116 2100 1000-M 1000-E 1000-F | |
| ------ ------ ------ ------ ------ ------ ------ | |
| N/A N/A N/A N/A N/A 93585A std | |
| The routines are mapped to instruction codes as follows: | |
| Instr. 1000-E 1000-F Description | |
| ------ ------ ------ ----------------------------------------- | |
| [test] 105320 -- [self test] | |
| .DAD 105321 105014 Double integer add | |
| .DMP 105322 105054 Double integer multiply | |
| .DNG 105323 105203 Double integer negate | |
| .DCO 105324 105204 Double integer compare | |
| .DDI 105325 105074 Double integer divide | |
| .DDIR 105326 105134 Double integer divide (reversed) | |
| .DSB 105327 105034 Double integer subtract | |
| .DIN 105330 105210 Double integer increment | |
| .DDE 105331 105211 Double integer decrement | |
| .DIS 105332 105212 Double integer increment and skip if zero | |
| .DDS 105333 105213 Double integer decrement and skip if zero | |
| .DSBR 105334 105114 Double integer subtraction (reversed) | |
| On the F-Series, the double-integer instruction codes are split among the | |
| floating-point processor and the Fast FORTRAN Processor ranges. They are | |
| dispatched from those respective simulators for processing here. | |
| Notes: | |
| 1. Opcodes 105335-105337 are NOPs in the microcode. They generate | |
| unimplemented instructions stops under simulation. | |
| 2. This is an implementation of Revision 2 of the microcode, which was | |
| released as ROM part numbers 93585-80003, 93585-80005, and 93585-80001 | |
| (Revision 1 substituted -80002 for -80005). | |
| 3. The F-Series firmware executes .DMP and .DDI/.DDIR by floating the | |
| 32-bit double integer to a 48-bit extended-precision number, calling the | |
| FPP to execute the extended-precision multiply/divide, and then fixing | |
| the product to a 32-bit double integer. We simulate these directly with | |
| 64- or 32-bit integer arithmetic. | |
| Additional references: | |
| - 93585A Microcode Source (93585-18002 Rev. 2005) | |
| - 93585A Double Integer Instructions Installation and Reference Manual | |
| (93585-90007) | |
| */ | |
| static const OP_PAT op_dbi[16] = { | |
| OP_N, OP_JD, OP_JD, OP_J, /* [test] .DAD .DMP .DNG */ | |
| OP_JD, OP_JD, OP_JD, OP_JD, /* .DCO .DDI .DDIR .DSB */ | |
| OP_J, OP_J, OP_A, OP_A, /* .DIN .DDE .DIS .DDS */ | |
| OP_JD, OP_N, OP_N, OP_N /* .DSBR --- --- --- */ | |
| }; | |
| t_stat cpu_dbi (uint32 IR, uint32 intrq) | |
| { | |
| OP din; | |
| OPS op; | |
| uint32 entry, t; | |
| t_stat reason = SCPE_OK; | |
| if ((cpu_unit.flags & UNIT_DBI) == 0) /* DBI option installed? */ | |
| return stop_inst; | |
| entry = IR & 017; /* mask to entry point */ | |
| if (op_dbi[entry] != OP_N) | |
| if (reason = cpu_ops (op_dbi[entry], op, intrq)) /* get instruction operands */ | |
| return reason; | |
| switch (entry) { /* decode IR<3:0> */ | |
| case 000: /* [test] 105320 (OP_N) */ | |
| XR = 2; /* set revision */ | |
| BR = 0377; /* side effect of microcode */ | |
| SR = 0102077; /* set "pass" code */ | |
| PC = (PC + 1) & VAMASK; /* return to P+1 */ | |
| t = (AR << 16) | BR; /* set t for return */ | |
| break; | |
| case 001: /* .DAD 105321 (OP_JD) */ | |
| t = op[0].dword + op[1].dword; /* add values */ | |
| E = E | (t < op[0].dword); /* carry if result smaller */ | |
| O = (((~op[0].dword ^ op[1].dword) & /* overflow if sign wrong */ | |
| (op[0].dword ^ t) & SIGN32) != 0); | |
| break; | |
| case 002: /* .DMP 105322 (OP_JD) */ | |
| { | |
| #if defined (HAVE_INT64) /* int64 support available */ | |
| t_int64 t64; | |
| t64 = (t_int64) INT32 (op[0].dword) * /* multiply signed values */ | |
| (t_int64) INT32 (op[1].dword); | |
| O = ((t64 < -(t_int64) 0x80000000) || /* overflow if out of range */ | |
| (t64 > (t_int64) 0x7FFFFFFF)); | |
| if (O) | |
| t = ~SIGN32; /* if overflow, rtn max pos */ | |
| else | |
| t = (uint32) (t64 & DMASK32); /* else lower 32 bits of result */ | |
| #else /* int64 support unavailable */ | |
| uint32 sign, xu, yu, rh, rl; | |
| sign = ((int32) op[0].dword < 0) ^ /* save sign of result */ | |
| ((int32) op[1].dword < 0); | |
| xu = (uint32) abs ((int32) op[0].dword); /* make operands pos */ | |
| yu = (uint32) abs ((int32) op[1].dword); | |
| if ((xu & 0xFFFF0000) == 0 && /* 16 x 16 multiply? */ | |
| (yu & 0xFFFF0000) == 0) { | |
| t = xu * yu; /* do it */ | |
| O = 0; /* can't overflow */ | |
| } | |
| else if ((xu & 0xFFFF0000) != 0 && /* 32 x 32 multiply? */ | |
| (yu & 0xFFFF0000) != 0) | |
| O = 1; /* always overflows */ | |
| else { /* 16 x 32 or 32 x 16 */ | |
| rl = (xu & 0xFFFF) * (yu & 0xFFFF); /* form 1st partial product */ | |
| if ((xu & 0xFFFF0000) == 0) | |
| rh = xu * (yu >> 16) + (rl >> 16); /* 16 x 32 2nd partial */ | |
| else | |
| rh = (xu >> 16) * yu + (rl >> 16); /* 32 x 16 2nd partial */ | |
| O = (rh > 0x7FFF + sign); /* check for out of range */ | |
| if (O == 0) | |
| t = (rh << 16) | (rl & 0xFFFF); /* combine partials */ | |
| } | |
| if (O) | |
| t = ~SIGN32; /* if overflow, rtn max pos */ | |
| else if (sign) | |
| t = ~t + 1; /* if result neg, 2s compl */ | |
| #endif /* end of int64 support */ | |
| } | |
| break; | |
| case 003: /* .DNG 105323 (OP_J) */ | |
| t = ~op[0].dword + 1; /* negate value */ | |
| O = (op[0].dword == SIGN32); /* overflow if max neg */ | |
| if (op[0].dword == 0) /* borrow if result zero */ | |
| E = 1; | |
| break; | |
| case 004: /* .DCO 105324 (OP_JD) */ | |
| t = op[0].dword; /* copy for later store */ | |
| if ((int32) op[0].dword < (int32) op[1].dword) | |
| PC = (PC + 1) & VAMASK; /* < rtns to P+2 */ | |
| else if ((int32) op[0].dword > (int32) op[1].dword) | |
| PC = (PC + 2) & VAMASK; /* > rtns to P+3 */ | |
| break; /* = rtns to P+1 */ | |
| case 005: /* .DDI 105325 (OP_JD) */ | |
| DDI: | |
| O = ((op[1].dword == 0) || /* overflow if div 0 */ | |
| ((op[0].dword == SIGN32) && /* or max neg div -1 */ | |
| ((int32) op[1].dword == -1))); | |
| if (O) | |
| t = ~SIGN32; /* rtn max pos for ovf */ | |
| else | |
| t = (uint32) (INT32 (op[0].dword) / /* else return quotient */ | |
| INT32 (op[1].dword)); | |
| break; | |
| case 006: /* .DDIR 105326 (OP_JD) */ | |
| t = op[0].dword; /* swap operands */ | |
| op[0].dword = op[1].dword; | |
| op[1].dword = t; | |
| goto DDI; /* continue at .DDI */ | |
| case 007: /* .DSB 105327 (OP_JD) */ | |
| DSB: | |
| t = op[0].dword - op[1].dword; /* subtract values */ | |
| E = E | (op[0].dword < op[1].dword); /* borrow if minu < subtr */ | |
| O = (((op[0].dword ^ op[1].dword) & /* overflow if sign wrong */ | |
| (op[0].dword ^ t) & SIGN32) != 0); | |
| break; | |
| case 010: /* .DIN 105330 (OP_J) */ | |
| t = op[0].dword + 1; /* increment value */ | |
| O = (t == SIGN32); /* overflow if sign flipped */ | |
| if (t == 0) | |
| E = 1; /* carry if result zero */ | |
| break; | |
| case 011: /* .DDE 105331 (OP_J) */ | |
| t = op[0].dword - 1; /* decrement value */ | |
| O = (t == ~SIGN32); /* overflow if sign flipped */ | |
| if ((int32) t == -1) | |
| E = 1; /* borrow if result -1 */ | |
| break; | |
| case 012: /* .DIS 105332 (OP_A) */ | |
| din = ReadOp (op[0].word, in_d); /* get value */ | |
| t = din.dword = din.dword + 1; /* increment value */ | |
| WriteOp (op[0].word, din, in_d); /* store it back */ | |
| if (t == 0) | |
| PC = (PC + 1) & VAMASK; /* skip if result zero */ | |
| break; | |
| case 013: /* .DDS 105333 (OP_A) */ | |
| din = ReadOp (op[0].word, in_d); /* get value */ | |
| t = din.dword = din.dword - 1; /* decrement value */ | |
| WriteOp (op[0].word, din, in_d); /* write it back */ | |
| if (t == 0) | |
| PC = (PC + 1) & VAMASK; /* skip if result zero */ | |
| break; | |
| case 014: /* .DSBR 105334 (OP_JD) */ | |
| t = op[0].dword; /* swap operands */ | |
| op[0].dword = op[1].dword; | |
| op[1].dword = t; | |
| goto DSB; /* continue at .DSB */ | |
| default: /* others undefined */ | |
| t = (AR << 16) | BR; /* set t for NOP */ | |
| reason = stop_inst; | |
| } | |
| if (reason == SCPE_OK) { /* if return OK */ | |
| AR = (t >> 16) & DMASK; /* break result */ | |
| BR = t & DMASK; /* into A and B */ | |
| } | |
| return reason; | |
| } |