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riscv: Fix detecting FPU support in standard extension

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We should check the string until it hits underscore, in case it
searches multi-letter extensions. For example, "rv64imac_xandes"
will be treated as D extension support since there is a "d" in
"andes", resulting illegal instruction caused by initializing FCSR.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Padmarao Begari <padmarao.begari@microchip.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Yu Chien Peter Lin 2022-11-05 14:02:14 +08:00 committed by Leo Yu-Chi Liang
parent 3f3527044d
commit c277c787a0
1 changed files with 11 additions and 3 deletions
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14
arch/riscv/cpu/cpu.c
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@ -36,6 +36,7 @@ static inline bool supports_extension(char ext)
#ifdef CONFIG_CPU
struct udevice *dev;
char desc[32];
int i;
uclass_find_first_device(UCLASS_CPU, &dev);
if (!dev) {
@ -43,9 +44,16 @@ static inline bool supports_extension(char ext)
return false;
}
if (!cpu_get_desc(dev, desc, sizeof(desc))) {
/* skip the first 4 characters (rv32|rv64) */
if (strchr(desc + 4, ext))
return true;
/*
* skip the first 4 characters (rv32|rv64) and
* check until underscore
*/
for (i = 4; i < sizeof(desc); i++) {
if (desc[i] == '_' || desc[i] == '\0')
break;
if (desc[i] == ext)
return true;
}
}
return false;