mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Palmer Dabbelt](/assets/img/avatar_default.png)
This patch contains code that is in some way visible to the user: including via system calls, the VDSO, module loading and signal handling. It also contains some generic code that is ABI visible. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
|
|
* Copied from arch/arm64/kernel/cpufeature.c
|
|
*
|
|
* Copyright (C) 2015 ARM Ltd.
|
|
* Copyright (C) 2017 SiFive
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <linux/of.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/hwcap.h>
|
|
|
|
unsigned long elf_hwcap __read_mostly;
|
|
|
|
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;
|
|
|
|
/*
|
|
* We don't support running Linux on hertergenous ISA systems. For
|
|
* now, we just check the ISA of the first processor.
|
|
*/
|
|
node = of_find_node_by_type(NULL, "cpu");
|
|
if (!node) {
|
|
pr_warning("Unable to find \"cpu\" devicetree entry");
|
|
return;
|
|
}
|
|
|
|
if (of_property_read_string(node, "riscv,isa", &isa)) {
|
|
pr_warning("Unable to find \"riscv,isa\" devicetree entry");
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < strlen(isa); ++i)
|
|
elf_hwcap |= isa2hwcap[(unsigned char)(isa[i])];
|
|
|
|
pr_info("elf_hwcap is 0x%lx", elf_hwcap);
|
|
}
|