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- /* Copyright (C) 2021 Free Software Foundation, Inc.
- Contributed by Oracle.
- This file is part of GNU Binutils.
- 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 3, 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, 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA. */
- #if defined(__i386__) || defined(__x86_64)
- #include <cpuid.h> /* GCC-provided */
- #elif defined(__aarch64__)
- #define ATTRIBUTE_UNUSED __attribute__((unused))
- static inline uint_t __attribute_const__
- __get_cpuid (unsigned int op ATTRIBUTE_UNUSED, unsigned int *eax,
- unsigned int *ebx ATTRIBUTE_UNUSED,
- unsigned int *ecx ATTRIBUTE_UNUSED, unsigned int *edx ATTRIBUTE_UNUSED)
- {
- // CPUID bit assignments:
- // [31:24] IMPLEMENTER (0x50 - ARM_CPU_IMP_APM)
- // [23:20] VARIANT indicates processor revision (0x2 = Revision 2)
- // [19:16] Constant (Reads as 0xF)
- // [15:04] PARTNO indicates part number (0xC23 = Cortex-M3)
- // [03:00] REVISION indicates patch release (0x0 = Patch 0)
- // unsigned long v = 0;
- // __asm volatile ("MRS %[result], MPIDR_EL1" : [result] "=r" (v));
- // Tprintf(DBG_LT0, "cpuid.c:%d read_cpuid_id() MPIDR_EL1=0x%016lx\n", __LINE__, v);
- uint_t res = 0;
- __asm volatile ("MRS %[result], MIDR_EL1" : [result] "=r" (*eax));
- Tprintf (DBG_LT0, "cpuid.c:%d read_cpuid_id() MIDR_EL1=0x%016x\n", __LINE__, *eax);
- return res;
- }
- #endif
- /*
- * Various routines to handle identification
- * and classification of x86 processors.
- */
- #define IS_GLOBAL /* externally visible */
- #define X86_VENDOR_Intel 0
- #define X86_VENDORSTR_Intel "GenuineIntel"
- #define X86_VENDOR_IntelClone 1
- #define X86_VENDOR_AMD 2
- #define X86_VENDORSTR_AMD "AuthenticAMD"
- #define BITX(u, h, l) (((u) >> (l)) & ((1LU << ((h) - (l) + 1LU)) - 1LU))
- #define CPI_FAMILY_XTD(reg) BITX(reg, 27, 20)
- #define CPI_MODEL_XTD(reg) BITX(reg, 19, 16)
- #define CPI_TYPE(reg) BITX(reg, 13, 12)
- #define CPI_FAMILY(reg) BITX(reg, 11, 8)
- #define CPI_STEP(reg) BITX(reg, 3, 0)
- #define CPI_MODEL(reg) BITX(reg, 7, 4)
- #define IS_EXTENDED_MODEL_INTEL(model) ((model) == 0x6 || (model) >= 0xf)
- typedef struct
- {
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- } cpuid_regs_t;
- typedef struct
- {
- unsigned int cpi_model;
- unsigned int cpi_family;
- unsigned int cpi_vendor; /* enum of cpi_vendorstr */
- unsigned int cpi_maxeax; /* fn 0: %eax */
- char cpi_vendorstr[13]; /* fn 0: %ebx:%ecx:%edx */
- } cpuid_info_t;
- #if defined(__i386__) || defined(__x86_64)
- static uint_t
- cpuid_vendorstr_to_vendorcode (char *vendorstr)
- {
- if (strcmp (vendorstr, X86_VENDORSTR_Intel) == 0)
- return X86_VENDOR_Intel;
- else if (strcmp (vendorstr, X86_VENDORSTR_AMD) == 0)
- return X86_VENDOR_AMD;
- else
- return X86_VENDOR_IntelClone;
- }
- static int
- my_cpuid (unsigned int op, cpuid_regs_t *regs)
- {
- regs->eax = regs->ebx = regs->ecx = regs->edx = 0;
- int ret = __get_cpuid (op, ®s->eax, ®s->ebx, ®s->ecx, ®s->edx);
- TprintfT (DBG_LT1, "my_cpuid: __get_cpuid(0x%x, 0x%x, 0x%x, 0x%x, 0x%x) returns %d\n",
- op, regs->eax, regs->ebx, regs->ecx, regs->edx, ret);
- return ret;
- }
- #endif
- static cpuid_info_t *
- get_cpuid_info ()
- {
- static int cpuid_inited = 0;
- static cpuid_info_t cpuid_info;
- cpuid_info_t *cpi = &cpuid_info;
- if (cpuid_inited)
- return cpi;
- cpuid_inited = 1;
- #if defined(__aarch64__)
- // CPUID bit assignments:
- // [31:24] IMPLEMENTER (0x50 - ARM_CPU_IMP_APM)
- // [23:20] VARIANT indicates processor revision (0x2 = Revision 2)
- // [19:16] Constant (Reads as 0xF)
- // [15:04] PARTNO indicates part number (0xC23 = Cortex-M3)
- // [03:00] REVISION indicates patch release (0x0 = Patch 0)
- uint_t reg = 0;
- __asm volatile ("MRS %[result], MIDR_EL1" : [result] "=r" (reg));
- cpi->cpi_vendor = reg >> 24;
- cpi->cpi_model = (reg >> 4) & 0xfff;
- switch (cpi->cpi_vendor)
- {
- case ARM_CPU_IMP_APM:
- case ARM_CPU_IMP_ARM:
- case ARM_CPU_IMP_CAVIUM:
- case ARM_CPU_IMP_BRCM:
- case ARM_CPU_IMP_QCOM:
- strncpy (cpi->cpi_vendorstr, AARCH64_VENDORSTR_ARM, sizeof (cpi->cpi_vendorstr));
- break;
- default:
- strncpy (cpi->cpi_vendorstr, "UNKNOWN ARM", sizeof (cpi->cpi_vendorstr));
- break;
- }
- Tprintf (DBG_LT0, "cpuid.c:%d read_cpuid_id() MIDR_EL1==0x%016x cpi_vendor=%d cpi_model=%d\n",
- __LINE__, (unsigned int) reg, cpi->cpi_vendor, cpi->cpi_model);
- #elif defined(__i386__) || defined(__x86_64)
- cpuid_regs_t regs;
- my_cpuid (0, ®s);
- cpi->cpi_maxeax = regs.eax;
- ((uint32_t *) cpi->cpi_vendorstr)[0] = regs.ebx;
- ((uint32_t *) cpi->cpi_vendorstr)[1] = regs.edx;
- ((uint32_t *) cpi->cpi_vendorstr)[2] = regs.ecx;
- cpi->cpi_vendorstr[12] = 0;
- cpi->cpi_vendor = cpuid_vendorstr_to_vendorcode (cpi->cpi_vendorstr);
- my_cpuid (1, ®s);
- cpi->cpi_model = CPI_MODEL (regs.eax);
- cpi->cpi_family = CPI_FAMILY (regs.eax);
- if (cpi->cpi_family == 0xf)
- cpi->cpi_family += CPI_FAMILY_XTD (regs.eax);
- /*
- * Beware: AMD uses "extended model" iff base *FAMILY* == 0xf.
- * Intel, and presumably everyone else, uses model == 0xf, as
- * one would expect (max value means possible overflow). Sigh.
- */
- switch (cpi->cpi_vendor)
- {
- case X86_VENDOR_Intel:
- if (IS_EXTENDED_MODEL_INTEL (cpi->cpi_family))
- cpi->cpi_model += CPI_MODEL_XTD (regs.eax) << 4;
- break;
- case X86_VENDOR_AMD:
- if (CPI_FAMILY (cpi->cpi_family) == 0xf)
- cpi->cpi_model += CPI_MODEL_XTD (regs.eax) << 4;
- break;
- default:
- if (cpi->cpi_model == 0xf)
- cpi->cpi_model += CPI_MODEL_XTD (regs.eax) << 4;
- break;
- }
- #endif
- return cpi;
- }
- static inline uint_t
- cpuid_getvendor ()
- {
- return get_cpuid_info ()->cpi_vendor;
- }
- static inline uint_t
- cpuid_getfamily ()
- {
- return get_cpuid_info ()->cpi_family;
- }
- static inline uint_t
- cpuid_getmodel ()
- {
- return get_cpuid_info ()->cpi_model;
- }
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