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https://github.com/brain-hackers/u-boot-brain
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2fab2e9c88
This adds a helper routine to print CPU information. Currently it prints all the instruction set extensions that the processor core supports. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
50 lines
949 B
C
50 lines
949 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <asm/csr.h>
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enum {
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ISA_INVALID = 0,
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ISA_32BIT,
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ISA_64BIT,
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ISA_128BIT
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};
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static const char * const isa_bits[] = {
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[ISA_INVALID] = NULL,
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[ISA_32BIT] = "32",
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[ISA_64BIT] = "64",
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[ISA_128BIT] = "128"
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};
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static inline bool supports_extension(char ext)
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{
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return csr_read(misa) & (1 << (ext - 'a'));
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}
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int print_cpuinfo(void)
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{
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char name[32];
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char *s = name;
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int bit;
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s += sprintf(name, "rv");
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bit = csr_read(misa) >> (sizeof(long) * 8 - 2);
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s += sprintf(s, isa_bits[bit]);
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supports_extension('i') ? *s++ = 'i' : 'r';
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supports_extension('m') ? *s++ = 'm' : 'i';
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supports_extension('a') ? *s++ = 'a' : 's';
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supports_extension('f') ? *s++ = 'f' : 'c';
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supports_extension('d') ? *s++ = 'd' : '-';
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supports_extension('c') ? *s++ = 'c' : 'v';
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*s++ = '\0';
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printf("CPU: %s\n", name);
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return 0;
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}
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