mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-11 05:36:17 +09:00
5d8b2e7711
Store the hart ID and device tree passed by the prior boot stage (in a0 and a1) in registers s0 and s1. Replace one use of s1 in start.S to avoid overwriting it. The device tree is also stored in memory to make it available to U-Boot with the configuration CONFIG_OF_PRIOR_STAGE. Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Rick Chen <rick@andestech.com>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
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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/*
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* prior_stage_fdt_address must be stored in the data section since it is used
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* before the bss section is available.
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*/
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phys_addr_t prior_stage_fdt_address __attribute__((section(".data")));
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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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