319 lines
9.0 KiB
C
319 lines
9.0 KiB
C
/* x86 fat binary initializers.
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THE FUNCTIONS AND VARIABLES IN THIS FILE ARE FOR INTERNAL USE ONLY.
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THEY'RE ALMOST CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR
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COMPLETELY IN FUTURE GNU MP RELEASES.
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Copyright 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h> /* for printf */
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#include <stdlib.h> /* for getenv */
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#include <string.h>
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#include "mpir.h"
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#include "gmp-impl.h"
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/* Change this to "#define TRACE(x) x" for some traces. */
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#define TRACE(x)
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/* Change this to 1 to take the cpuid from GMP_CPU_TYPE env var. */
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#define WANT_FAKE_CPUID 0
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/* fat_entry.asm */
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long __gmpn_cpuid __GMP_PROTO ((char dst[12], int id));
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int __gmpn_cpuid_available __GMP_PROTO ((void));
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#if WANT_FAKE_CPUID
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/* The "name"s in the table are values for the GMP_CPU_TYPE environment
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variable. Anything can be used, but for now it's the canonical cpu types
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as per config.guess/config.sub. */
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#define __gmpn_cpuid fake_cpuid
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#define __gmpn_cpuid_available fake_cpuid_available
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#define MAKE_FMS(family, model) \
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(((family) << 8) + ((model << 4)))
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static struct {
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const char *name;
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const char vendor[13];
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unsigned fms;
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} fake_cpuid_table[] = {
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{ "i386", "" },
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{ "i486", "GenuineIntel", MAKE_FMS (4, 0) },
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{ "pentium", "GenuineIntel", MAKE_FMS (5, 0) },
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{ "pentiummmx", "GenuineIntel", MAKE_FMS (5, 4) },
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{ "pentiumpro", "GenuineIntel", MAKE_FMS (6, 0) },
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{ "pentium2", "GenuineIntel", MAKE_FMS (6, 2) },
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{ "pentium3", "GenuineIntel", MAKE_FMS (6, 7) },
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{ "pentium4", "GenuineIntel", MAKE_FMS (7, 0) },
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{ "k5", "AuthenticAMD", MAKE_FMS (5, 0) },
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{ "k6", "AuthenticAMD", MAKE_FMS (5, 3) },
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{ "k62", "AuthenticAMD", MAKE_FMS (5, 8) },
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{ "k63", "AuthenticAMD", MAKE_FMS (5, 9) },
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{ "athlon", "AuthenticAMD", MAKE_FMS (6, 0) },
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{ "x86_64", "AuthenticAMD", MAKE_FMS (15, 0) },
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{ "viac3", "CentaurHauls", MAKE_FMS (6, 0) },
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{ "viac32", "CentaurHauls", MAKE_FMS (6, 9) },
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};
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static int
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fake_cpuid_lookup (void)
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{
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char *s;
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int i;
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s = getenv ("GMP_CPU_TYPE");
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if (s == NULL)
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{
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printf ("Need GMP_CPU_TYPE environment variable for fake cpuid\n");
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abort ();
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}
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for (i = 0; i < numberof (fake_cpuid_table); i++)
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if (strcmp (s, fake_cpuid_table[i].name) == 0)
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return i;
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printf ("GMP_CPU_TYPE=%s unknown\n", s);
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abort ();
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}
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static int
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fake_cpuid_available (void)
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{
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return fake_cpuid_table[fake_cpuid_lookup()].vendor[0] != '\0';
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}
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static long
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fake_cpuid (char dst[12], int id)
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{
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int i = fake_cpuid_lookup();
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switch (id) {
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case 0:
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memcpy (dst, fake_cpuid_table[i].vendor, 12);
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return 0;
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case 1:
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return fake_cpuid_table[i].fms;
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default:
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printf ("fake_cpuid(): oops, unknown id %d\n", id);
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abort ();
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}
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}
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#endif
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typedef DECL_preinv_divrem_1 ((*preinv_divrem_1_t));
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typedef DECL_preinv_mod_1 ((*preinv_mod_1_t));
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struct cpuvec_t __gmpn_cpuvec = {
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__MPN(add_n_init),
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__MPN(addmul_1_init),
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__MPN(copyd_init),
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__MPN(copyi_init),
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__MPN(divexact_1_init),
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__MPN(divexact_by3c_init),
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__MPN(divrem_1_init),
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__MPN(gcd_1_init),
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__MPN(lshift_init),
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__MPN(mod_1_init),
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__MPN(mod_34lsub1_init),
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__MPN(modexact_1c_odd_init),
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__MPN(mul_1_init),
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__MPN(mul_basecase_init),
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__MPN(preinv_divrem_1_init),
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__MPN(preinv_mod_1_init),
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__MPN(redc_basecase_init),
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__MPN(rshift_init),
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__MPN(sqr_basecase_init),
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__MPN(sub_n_init),
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__MPN(submul_1_init),
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__MPN(sumdiff_n_init),
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0
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};
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/* The following setups start with generic x86, then overwrite with
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specifics for a chip, and higher versions of that chip.
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The arrangement of the setups here will normally be the same as the $path
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selections in configure.in for the respective chips.
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This code is reentrant and thread safe. We always calculate the same
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decided_cpuvec, so if two copies of the code are running it doesn't
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matter which completes first, both write the same to __gmpn_cpuvec.
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We need to go via decided_cpuvec because if one thread has completed
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__gmpn_cpuvec then it may be making use of the threshold values in that
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vector. If another thread is still running __gmpn_cpuvec_init then we
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don't want it to write different values to those fields since some of the
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asm routines only operate correctly up to their own defined threshold,
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not an arbitrary value. */
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void
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__gmpn_cpuvec_init (void)
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{
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struct cpuvec_t decided_cpuvec;
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TRACE (printf ("__gmpn_cpuvec_init:\n"));
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memset (&decided_cpuvec, '\0', sizeof (decided_cpuvec));
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CPUVEC_SETUP_x86_64;
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CPUVEC_SETUP_fat;
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if (! __gmpn_cpuid_available ())
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{
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TRACE (printf (" 80386, or early 80486 without cpuid\n"));
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}
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else
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{
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char vendor_string[13];
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char dummy_string[12];
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long fms;
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int family, model;
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__gmpn_cpuid (vendor_string, 0);
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vendor_string[12] = 0;
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fms = __gmpn_cpuid (dummy_string, 1);
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family = ((fms >> 8) & 15) + ((fms >> 20) & 0xff);
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model = ((fms >> 4) & 15) + ((fms >> 12) & 0xf0);
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if (strcmp (vendor_string, "GenuineIntel") == 0)
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{
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switch (family)
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{
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case 4:
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TRACE (printf (" 80486 with cpuid\n"));
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break;
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case 5:
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TRACE (printf (" pentium\n"));
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if (model >= 4)
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{
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TRACE (printf (" pentiummmx\n"));
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}
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break;
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case 6:
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TRACE (printf (" pentiumpro\n"));
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if (model >= 2)
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{
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TRACE (printf (" pentium2\n"));
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}
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if (model >= 7)
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{
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TRACE (printf (" pentium3\n"));
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}
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if (model==15 || model==22 || model==23 || model==29 || model==26)
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{TRACE (printf (" core2\n"));
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CPUVEC_SETUP_core2;
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break;
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}
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break;
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case 15:
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TRACE (printf (" nocona\n"));
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CPUVEC_SETUP_core2;
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break;
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}
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}
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else if (strcmp (vendor_string, "AuthenticAMD") == 0)
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{
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switch (family)
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{
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case 5:
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if (model <= 3)
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{
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TRACE (printf (" k5\n"));
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}
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else
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{
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TRACE (printf (" k6\n"));
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if (model >= 8)
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{
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TRACE (printf (" k62\n"));
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}
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if (model >= 9)
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{
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TRACE (printf (" k63\n"));
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}
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}
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break;
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case 6:
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TRACE (printf (" athlon\n"));
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athlon:
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break;
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case 15:
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TRACE (printf (" x86_64\n"));
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CPUVEC_SETUP_amd64;
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break;
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case 16:
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TRACE (printf (" x86_64\n"));
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CPUVEC_SETUP_amd64;
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break;
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}
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}
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else if (strcmp (vendor_string, "CentaurHauls") == 0)
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{
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switch (family)
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{
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case 6:
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TRACE (printf (" viac3\n"));
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if (model >= 9)
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{
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TRACE (printf (" viac32\n"));
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}
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break;
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}
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}
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else if (strcmp (vendor_string, "CyrixInstead") == 0)
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{
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/* Should recognize Cyrix' processors too. */
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TRACE (printf (" cyrix something\n"));
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}
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}
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/* There's no x86 generic mpn_preinv_divrem_1 or mpn_preinv_mod_1.
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Instead default to the plain versions from whichever CPU we detected.
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The function arguments are compatible, no need for any glue code. */
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if (decided_cpuvec.preinv_divrem_1 == NULL)
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decided_cpuvec.preinv_divrem_1 =(preinv_divrem_1_t)decided_cpuvec.divrem_1;
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if (decided_cpuvec.preinv_mod_1 == NULL)
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decided_cpuvec.preinv_mod_1 =(preinv_mod_1_t) decided_cpuvec.mod_1;
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ASSERT_CPUVEC (decided_cpuvec);
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CPUVEC_INSTALL (decided_cpuvec);
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/* Set this once the threshold fields are ready.
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Use volatile to prevent it getting moved. */
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((volatile struct cpuvec_t *) &__gmpn_cpuvec)->initialized = 1;
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}
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