diff options
| author | Yong-Xuan Wang <yongxuan.wang@sifive.com> | 2023-12-12 08:58:35 +0000 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-12-19 15:39:17 +0530 |
| commit | 3daac8fb87a4d04fe8dfc0ff4a6ffb947107e1a9 (patch) | |
| tree | 56a7fdfda0a4858227fe3363e7043d03ce1e2d40 /lib/sbi/sbi_hart.c | |
| parent | 776770d2adbf3ae7d9d3b97f0756c7589003835f (diff) | |
| download | opensbi-3daac8fb87a4d04fe8dfc0ff4a6ffb947107e1a9.zip opensbi-3daac8fb87a4d04fe8dfc0ff4a6ffb947107e1a9.tar.gz opensbi-3daac8fb87a4d04fe8dfc0ff4a6ffb947107e1a9.tar.bz2 | |
lib: sbi: Detect extensions from the ISA string in DT
Enable access to some extensions through menvcfg and show them in "Boot
HART ISA Extensions" if they are present in the device tree.
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'lib/sbi/sbi_hart.c')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 49 |
1 files changed, 15 insertions, 34 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index 80699fe..46cd55d 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -112,47 +112,25 @@ static void mstatus_init(struct sbi_scratch *scratch) menvcfg_val |= ((uint64_t)csr_read(CSR_MENVCFGH)) << 32; #endif - /* - * Set menvcfg.CBZE == 1 - * - * If Zicboz extension is not available then writes to - * menvcfg.CBZE will be ignored because it is a WARL field. - */ - menvcfg_val |= ENVCFG_CBZE; - - /* - * Set menvcfg.CBCFE == 1 - * - * If Zicbom extension is not available then writes to - * menvcfg.CBCFE will be ignored because it is a WARL field. - */ - menvcfg_val |= ENVCFG_CBCFE; +#define __set_menvcfg_ext(__ext, __bits) \ + if (sbi_hart_has_extension(scratch, __ext)) \ + menvcfg_val |= __bits; /* - * Set menvcfg.CBIE == 3 - * - * If Zicbom extension is not available then writes to - * menvcfg.CBIE will be ignored because it is a WARL field. + * Enable access to extensions if they are present in the + * hardware or in the device tree. */ - menvcfg_val |= ENVCFG_CBIE_INV << ENVCFG_CBIE_SHIFT; - /* - * Set menvcfg.PBMTE == 1 for RV64 or RV128 - * - * If Svpbmt extension is not available then menvcfg.PBMTE - * will be read-only zero. - */ + __set_menvcfg_ext(SBI_HART_EXT_ZICBOZ, ENVCFG_CBZE) + __set_menvcfg_ext(SBI_HART_EXT_ZICBOM, ENVCFG_CBCFE) + __set_menvcfg_ext(SBI_HART_EXT_ZICBOM, + ENVCFG_CBIE_INV << ENVCFG_CBIE_SHIFT) #if __riscv_xlen > 32 - menvcfg_val |= ENVCFG_PBMTE; + __set_menvcfg_ext(SBI_HART_EXT_SVPBMT, ENVCFG_PBMTE) #endif + __set_menvcfg_ext(SBI_HART_EXT_SSTC, ENVCFG_STCE) - /* - * The spec doesn't explicitly describe the reset value of menvcfg. - * Enable access to stimecmp if sstc extension is present in the - * hardware. - */ - if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSTC)) - menvcfg_val |= ENVCFG_STCE; +#undef __set_menvcfg_ext csr_write(CSR_MENVCFG, menvcfg_val); #if __riscv_xlen == 32 @@ -676,6 +654,9 @@ const struct sbi_hart_ext_data sbi_hart_ext[] = { __SBI_HART_EXT_DATA(zkr, SBI_HART_EXT_ZKR), __SBI_HART_EXT_DATA(smcntrpmf, SBI_HART_EXT_SMCNTRPMF), __SBI_HART_EXT_DATA(xandespmu, SBI_HART_EXT_XANDESPMU), + __SBI_HART_EXT_DATA(zicboz, SBI_HART_EXT_ZICBOZ), + __SBI_HART_EXT_DATA(zicbom, SBI_HART_EXT_ZICBOM), + __SBI_HART_EXT_DATA(svpbmt, SBI_HART_EXT_SVPBMT), }; /** |