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* Copyright (c) 2007 Michal Kebrt
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* @brief CPU identification.
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/** Number of indexes left out in the #imp_data array */
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#define IMP_DATA_START_OFFSET 0x40
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/** Implementators (vendor) names */
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static char *imp_data[] = {
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"?", /* IMP_DATA_START_OFFSET */
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"Digital Equipment Corporation", /* 0x44 */
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"", "", "", "", "", "", "", "", "", "", /* 0x45 - 0x4e */
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"", "", "", "", "", "", "", "", "", "", /* 0x4f - 0x58 */
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"", "", "", "", "", "", "", "", "", "", /* 0x59 - 0x62 */
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"", "", "", "", "", "", /* 0x63 - 0x68 */
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"Intel Corporation" /* 0x69 */
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/** Length of the #imp_data array */
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static unsigned int imp_data_length = sizeof(imp_data) / sizeof(char *);
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/** Architecture names */
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static char *arch_data[] = {
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/** Length of the #arch_data array */
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static unsigned int arch_data_length = sizeof(arch_data) / sizeof(char *);
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/** Retrieves processor identification from CP15 register 0.
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* @param cpu Structure for storing CPU identification.
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static void arch_cpu_identify(cpu_arch_t *cpu)
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"mrc p15, 0, %[ident], c0, c0, 0\n"
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: [ident] "=r" (ident)
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cpu->imp_num = ident >> 24;
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cpu->variant_num = (ident << 8) >> 28;
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cpu->arch_num = (ident << 12) >> 28;
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cpu->prim_part_num = (ident << 16) >> 20;
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cpu->rev_num = (ident << 28) >> 28;
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/** Does nothing on ARM. */
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void cpu_arch_init(void)
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/** Retrieves processor identification and stores it to #CPU.arch */
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void cpu_identify(void)
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arch_cpu_identify(&CPU->arch);
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/** Prints CPU identification. */
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void cpu_print_report(cpu_t *m)
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char * vendor = imp_data[0];
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char * architecture = arch_data[0];
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cpu_arch_t * cpu_arch = &m->arch;
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if ((cpu_arch->imp_num) > 0 &&
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(cpu_arch->imp_num < (imp_data_length + IMP_DATA_START_OFFSET))) {
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vendor = imp_data[cpu_arch->imp_num - IMP_DATA_START_OFFSET];
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if ((cpu_arch->arch_num) > 0 &&
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(cpu_arch->arch_num < arch_data_length)) {
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architecture = arch_data[cpu_arch->arch_num];
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printf("cpu%d: vendor=%s, architecture=ARM%s, part number=%x, "
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"variant=%x, revision=%x\n",
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m->id, vendor, architecture, cpu_arch->prim_part_num,
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cpu_arch->variant_num, cpu_arch->rev_num);