+2004-06-08 Rhys Weatherley <rweather@southern-storm.com.au>
+
+ * jit/Makefile.am, jit/jit-cpuid-x86.c, jit/jit-cpuid-x86.h:
+ add an API for querying the x86 "cpuid" information.
+
2004-06-08 Miroslaw Dobrzanski-Neumann <mne@mosaic-ag.com>
* jit/jit-alloc.c: fix ROUND_END_PTR so that it adds the size
jit-block.c \
jit-cache.c \
jit-context.c \
+ jit-cpuid-x86.h \
+ jit-cpuid-x86.c \
jit-dump.c \
jit-elf-defs.h \
jit-elf-read.c \
--- /dev/null
+/*
+ * jit-cpuid-x86.c - Wrapper for the CPUID instruction.
+ *
+ * Copyright (C) 2004 Southern Storm Software, Pty Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "jit-cpuid-x86.h"
+
+#if defined(__i386) || defined(__i386__) || defined(_M_IX86)
+
+/*
+ * Determine if the "cpuid" instruction is present by twiddling
+ * bit 21 of the EFLAGS register.
+ */
+static int cpuid_present(void)
+{
+#if defined(__GNUC__)
+ int result;
+ __asm__ __volatile__ (
+ "\tpushfl\n"
+ "\tpopl %%eax\n"
+ "\tmovl %%eax, %%ecx\n"
+ "\tandl $0x200000, %%ecx\n"
+ "\txorl $0x200000, %%eax\n"
+ "\tpushl %%eax\n"
+ "\tpopfl\n"
+ "\tpushfl\n"
+ "\tandl $0x200000, %%eax\n"
+ "\txorl %%ecx, %%eax\n"
+ "\tmovl %%eax, %0\n"
+ : "=m" (result) : : "eax", "ecx"
+ );
+ return (result != 0);
+#else
+ return 0;
+#endif
+}
+
+/*
+ * Issue a "cpuid" query and get the result.
+ */
+static void cpuid_query(unsigned int index, jit_cpuid_x86_t *info)
+{
+#if defined(__GNUC__)
+ __asm__ __volatile__ (
+ "\tmovl %0, %%eax\n"
+ "\txorl %%ebx, %%ebx\n"
+ "\txorl %%ecx, %%ecx\n"
+ "\txorl %%edx, %%edx\n"
+ "\t.byte 0x0F\n" /* cpuid, safe against old assemblers */
+ "\t.byte 0xA2\n"
+ "\tmovl %1, %%esi\n"
+ "\tmovl %%eax, (%%esi)\n"
+ "\tmovl %%ebx, 4(%%esi)\n"
+ "\tmovl %%ecx, 8(%%esi)\n"
+ "\tmovl %%edx, 12(%%esi)\n"
+ : : "m"(index), "m"(info) : "eax", "ebx", "ecx", "edx", "esi"
+ );
+#endif
+}
+
+int _jit_cpuid_x86_get(unsigned int index, jit_cpuid_x86_t *info)
+{
+ /* Determine if this cpu has the "cpuid" instruction */
+ if(!cpuid_present())
+ {
+ return 0;
+ }
+
+ /* Validate the index */
+ if((index & 0x80000000) == 0)
+ {
+ cpuid_query(0, info);
+ }
+ else
+ {
+ cpuid_query(0x80000000, info);
+ }
+ if(index > info->eax)
+ {
+ return 0;
+ }
+
+ /* Execute the actual requested query */
+ cpuid_query(index, info);
+ return 1;
+}
+
+int _jit_cpuid_x86_has_feature(unsigned int feature)
+{
+ jit_cpuid_x86_t info;
+ if(!_jit_cpuid_x86_get(JIT_X86CPUID_FEATURES, &info))
+ {
+ return 0;
+ }
+ return ((info.edx & feature) != 0);
+}
+
+unsigned int _jit_cpuid_x86_line_size(void)
+{
+ jit_cpuid_x86_t info;
+ if(!_jit_cpuid_x86_get(JIT_X86CPUID_FEATURES, &info))
+ {
+ return 0;
+ }
+ if((info.edx & JIT_X86FEATURE_CLFSH) == 0)
+ {
+ return 0;
+ }
+ return ((info.ebx & 0x0000FF00) >> 5);
+}
+
+#endif /* i386 */
--- /dev/null
+/*
+ * jit-cpuid-x86.h - Wrapper for the CPUID instruction.
+ *
+ * Copyright (C) 2004 Southern Storm Software, Pty Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _JIT_CPUID_X86_H
+#define _JIT_CPUID_X86_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Structure that is used to return CPU identification information.
+ */
+typedef struct
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+
+} jit_cpuid_x86_t;
+
+/*
+ * Indexes for querying cpuid information.
+ */
+#define JIT_X86CPUID_FEATURES 1
+#define JIT_X86CPUID_CACHE_TLB 2
+#define JIT_X86CPUID_SERIAL_NUMBER 3
+
+/*
+ * Feature information.
+ */
+#define JIT_X86FEATURE_FPU 0x00000001
+#define JIT_X86FEATURE_VME 0x00000002
+#define JIT_X86FEATURE_DE 0x00000004
+#define JIT_X86FEATURE_PSE 0x00000008
+#define JIT_X86FEATURE_TSC 0x00000010
+#define JIT_X86FEATURE_MSR 0x00000020
+#define JIT_X86FEATURE_PAE 0x00000040
+#define JIT_X86FEATURE_MCE 0x00000080
+#define JIT_X86FEATURE_CX8 0x00000100
+#define JIT_X86FEATURE_APIC 0x00000200
+#define JIT_X86FEATURE_RESERVED_1 0x00000400
+#define JIT_X86FEATURE_SEP 0x00000800
+#define JIT_X86FEATURE_MTRR 0x00001000
+#define JIT_X86FEATURE_PGE 0x00002000
+#define JIT_X86FEATURE_MCA 0x00004000
+#define JIT_X86FEATURE_CMOV 0x00008000
+#define JIT_X86FEATURE_PAT 0x00010000
+#define JIT_X86FEATURE_PSE36 0x00020000
+#define JIT_X86FEATURE_PSN 0x00040000
+#define JIT_X86FEATURE_CLFSH 0x00080000
+#define JIT_X86FEATURE_RESERVED_2 0x00100000
+#define JIT_X86FEATURE_DS 0x00200000
+#define JIT_X86FEATURE_ACPI 0x00400000
+#define JIT_X86FEATURE_MMX 0x00800000
+#define JIT_X86FEATURE_FXSR 0x01000000
+#define JIT_X86FEATURE_SSE 0x02000000
+#define JIT_X86FEATURE_SSE2 0x04000000
+#define JIT_X86FEATURE_SS 0x08000000
+#define JIT_X86FEATURE_RESERVED_3 0x10000000
+#define JIT_X86FEATURE_TM 0x20000000
+#define JIT_X86FEATURE_RESERVED_4 0x40000000
+#define JIT_X86FEATURE_RESERVED_5 0x80000000
+
+/*
+ * Get CPU identification information. Returns zero if the requested
+ * information is not available.
+ */
+int _jit_cpuid_x86_get(unsigned int index, jit_cpuid_x86_t *info);
+
+/*
+ * Determine if the CPU has a particular feature.
+ */
+int _jit_cpuid_x86_has_feature(unsigned int feature);
+
+/*
+ * Get the size of the CPU cache line, or zero if flushing is not required.
+ */
+unsigned int _jit_cpuid_x86_line_size(void);
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /* _JIT_CPUID_X86_H */
projects / francis / libjit.git / commitdiff