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lib: sbi: Detect extensions from the ISA string in DT

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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>
This commit is contained in:
Yong-Xuan Wang
2023-12-12 08:58:35 +00:00
committed by Anup Patel
parent 776770d2ad
commit 3daac8fb87
2 changed files with 21 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/sbi/sbi_hart.h
View File

@@ -47,6 +47,12 @@ enum sbi_hart_extensions {
SBI_HART_EXT_SMCNTRPMF,
/** Hart has Xandespmu extension */
SBI_HART_EXT_XANDESPMU,
/** Hart has Zicboz extension */
SBI_HART_EXT_ZICBOZ,
/** Hart has Zicbom extension */
SBI_HART_EXT_ZICBOM,
/** Hart has Svpbmt extension */
SBI_HART_EXT_SVPBMT,
/** Maximum index of Hart extension */
SBI_HART_EXT_MAX,

49
lib/sbi/sbi_hart.c
View File

@@ -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;
#define __set_menvcfg_ext(__ext, __bits) \
if (sbi_hart_has_extension(scratch, __ext)) \
menvcfg_val |= __bits;
/*
* Set menvcfg.CBCFE == 1
*
* If Zicbom extension is not available then writes to
* menvcfg.CBCFE 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_CBCFE;
/*
* Set menvcfg.CBIE == 3
*
* If Zicbom extension is not available then writes to
* menvcfg.CBIE will be ignored because it is a WARL field.
*/
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),
};
/**