ecbb20f1a9
265. PROBLEM: Compiling the HP simulator for 64-bit addressing produces many
conversion warnings.
OBSERVATION: Compiling the simulator and defining USE_INT64 and USE_ADDR64
with implicit conversion warnings enabled reveals a number of places where
assumptions were made that addresses would always be 32 bits. This is a
reasonable assumption, as there are no devices (CPU or peripherals) that
can handle gigabyte addressing. Still, many of these assumptions are not
necessary, and some future peripheral simulator may exceed this limit.
CAUSE: Future expansion to 64-bit addressing was not envisioned.
RESOLUTION: Modify source files to ensure that "t_addr" and "t_value"
types are used instead of "uint32" and "int32" types where addressing and
data values may be 64 bits. Also ensure that valid conversions to smaller
sizes use explicit casts.
266. PROBLEM: BOOT devices require a duplicate S-register declaration.
OBSERVATION: All of the peripheral devices that support the BOOT command
set the select code and other parameters into the S register during the
boot process. This direct register access requires an external declaration
that duplicates the one in the full CPU declarations file (hp2100_cpu.h).
A better method that avoids the duplicate declaration would be for the
"ibl_copy" routine to modify the S register on behalf of the caller.
CAUSE: Poor original implementation.
RESOLUTION: Modify "ibl_copy" (hp2100_cpu.c) to take two additional
parameters that clear and set bits, respectively, in the S register on
behalf of the caller. Modify the boot routines for the CPU, DA, DP, DQ,
DR, DS, IPL, MS, and PTR devices to use the new parameters instead of
modifying the S register directly.
55 lines
2.7 KiB
C
55 lines
2.7 KiB
C
/* hp2100_fp1.h: HP 2100/1000 multiple-precision floating point definitions
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Copyright (c) 2005-2014, J. David Bryan
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the author shall not be used
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in advertising or otherwise to promote the sale, use or other dealings in
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this Software without prior written authorization from the author.
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24-Dec-14 JDB Changed fp_ucom return from uint32 to uint16
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14-Mar-13 MP Changed guard macro name to avoid reserved namespace
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16-Oct-06 JDB Generalized FP calling sequences for F-Series
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12-Oct-06 JDB Altered x_trun for F-Series FFP compatibility
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*/
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#ifndef HP2100_FP1_H_
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#define HP2100_FP1_H_ 0
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/* Special operands. */
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#define ACCUM NULL /* result not returned */
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static const OP NOP = { { 0, 0, 0, 0, 0 } }; /* unneeded operand */
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/* Generalized floating-point handlers. */
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void fp_prec (uint16 opcode, OPSIZE *operand_l, OPSIZE *operand_r, OPSIZE *result);
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uint32 fp_exec (uint16 opcode, OP *result, OP operand_l, OP operand_r);
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OP fp_accum (const OP *operand, OPSIZE precision);
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uint32 fp_pack (OP *result, OP mantissa, int32 exponent, OPSIZE precision);
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uint32 fp_nrpack (OP *result, OP mantissa, int32 exponent, OPSIZE precision);
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uint32 fp_unpack (OP *mantissa, int32 *exponent, OP packed, OPSIZE precision);
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uint16 fp_ucom (OP *mantissa, OPSIZE precision);
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uint32 fp_pcom (OP *packed, OPSIZE precision);
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uint32 fp_trun (OP *result, OP source, OPSIZE precision);
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uint32 fp_cvt (OP *result, OPSIZE source_precision, OPSIZE dest_precision);
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#endif
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