mirror of
https://github.com/torvalds/linux
synced 2024-10-21 18:59:26 +00:00
caab277b1d
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation 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 see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copied from arch/arm64/kernel/cpufeature.c
|
|
*
|
|
* Copyright (C) 2015 ARM Ltd.
|
|
* Copyright (C) 2017 SiFive
|
|
*/
|
|
|
|
#include <linux/of.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/hwcap.h>
|
|
#include <asm/smp.h>
|
|
|
|
unsigned long elf_hwcap __read_mostly;
|
|
#ifdef CONFIG_FPU
|
|
bool has_fpu __read_mostly;
|
|
#endif
|
|
|
|
void riscv_fill_hwcap(void)
|
|
{
|
|
struct device_node *node;
|
|
const char *isa;
|
|
size_t i;
|
|
static unsigned long isa2hwcap[256] = {0};
|
|
|
|
isa2hwcap['i'] = isa2hwcap['I'] = COMPAT_HWCAP_ISA_I;
|
|
isa2hwcap['m'] = isa2hwcap['M'] = COMPAT_HWCAP_ISA_M;
|
|
isa2hwcap['a'] = isa2hwcap['A'] = COMPAT_HWCAP_ISA_A;
|
|
isa2hwcap['f'] = isa2hwcap['F'] = COMPAT_HWCAP_ISA_F;
|
|
isa2hwcap['d'] = isa2hwcap['D'] = COMPAT_HWCAP_ISA_D;
|
|
isa2hwcap['c'] = isa2hwcap['C'] = COMPAT_HWCAP_ISA_C;
|
|
|
|
elf_hwcap = 0;
|
|
|
|
for_each_of_cpu_node(node) {
|
|
unsigned long this_hwcap = 0;
|
|
|
|
if (riscv_of_processor_hartid(node) < 0)
|
|
continue;
|
|
|
|
if (of_property_read_string(node, "riscv,isa", &isa)) {
|
|
pr_warn("Unable to find \"riscv,isa\" devicetree entry\n");
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < strlen(isa); ++i)
|
|
this_hwcap |= isa2hwcap[(unsigned char)(isa[i])];
|
|
|
|
/*
|
|
* All "okay" hart should have same isa. Set HWCAP based on
|
|
* common capabilities of every "okay" hart, in case they don't
|
|
* have.
|
|
*/
|
|
if (elf_hwcap)
|
|
elf_hwcap &= this_hwcap;
|
|
else
|
|
elf_hwcap = this_hwcap;
|
|
}
|
|
|
|
/* We don't support systems with F but without D, so mask those out
|
|
* here. */
|
|
if ((elf_hwcap & COMPAT_HWCAP_ISA_F) && !(elf_hwcap & COMPAT_HWCAP_ISA_D)) {
|
|
pr_info("This kernel does not support systems with F but not D\n");
|
|
elf_hwcap &= ~COMPAT_HWCAP_ISA_F;
|
|
}
|
|
|
|
pr_info("elf_hwcap is 0x%lx\n", elf_hwcap);
|
|
|
|
#ifdef CONFIG_FPU
|
|
if (elf_hwcap & (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D))
|
|
has_fpu = true;
|
|
#endif
|
|
}
|