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lib: sbi: Improve the code of privilege mode and extensions detection

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We can enhance the code by creating 2 unified interface with macro  for
privilege mode and extensions detection, which relies on supported
privilege modes and CSRs.

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 08:58:32 +00:00
committed by Anup Patel
parent 925ce14622
commit 2c8be566f3
1 changed files with 39 additions and 51 deletions
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90
lib/sbi/sbi_hart.c
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@@ -807,6 +807,7 @@ static int hart_detect_features(struct sbi_scratch *scratch)
sbi_memset(hfeatures->extensions, 0, sizeof(hfeatures->extensions));
hfeatures->pmp_count = 0;
hfeatures->mhpm_mask = 0;
hfeatures->priv_version = SBI_HART_PRIV_VER_UNKNOWN;
#define __check_hpm_csr(__csr, __mask) \
oldval = csr_read_allowed(__csr, (ulong)&trap); \
@@ -899,67 +900,54 @@ __pmp_skip:
#undef __check_csr_2
#undef __check_csr
#define __check_priv(__csr, __base_priv, __priv) \
val = csr_read_allowed(__csr, (ulong)&trap); \
if (!trap.cause && (hfeatures->priv_version >= __base_priv)) { \
hfeatures->priv_version = __priv; \
}
/* Detect if hart supports Priv v1.10 */
val = csr_read_allowed(CSR_MCOUNTEREN, (unsigned long)&trap);
if (!trap.cause)
hfeatures->priv_version = SBI_HART_PRIV_VER_1_10;
__check_priv(CSR_MCOUNTEREN,
SBI_HART_PRIV_VER_UNKNOWN, SBI_HART_PRIV_VER_1_10);
/* Detect if hart supports Priv v1.11 */
val = csr_read_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap);
if (!trap.cause &&
(hfeatures->priv_version >= SBI_HART_PRIV_VER_1_10))
hfeatures->priv_version = SBI_HART_PRIV_VER_1_11;
__check_priv(CSR_MCOUNTINHIBIT,
SBI_HART_PRIV_VER_1_10, SBI_HART_PRIV_VER_1_11);
/* Detect if hart supports Priv v1.12 */
csr_read_allowed(CSR_MENVCFG, (unsigned long)&trap);
if (!trap.cause &&
(hfeatures->priv_version >= SBI_HART_PRIV_VER_1_11))
hfeatures->priv_version = SBI_HART_PRIV_VER_1_12;
__check_priv(CSR_MENVCFG,
SBI_HART_PRIV_VER_1_11, SBI_HART_PRIV_VER_1_12);
#undef __check_priv_csr
#define __check_ext_csr(__base_priv, __csr, __ext) \
if (hfeatures->priv_version >= __base_priv) { \
csr_read_allowed(__csr, (ulong)&trap); \
if (!trap.cause) \
__sbi_hart_update_extension(hfeatures, \
__ext, true); \
}
/* Counter overflow/filtering is not useful without mcounter/inhibit */
if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_11) {
/* Detect if hart supports sscofpmf */
csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SSCOFPMF, true);
}
/* Detect if hart supports sscofpmf */
__check_ext_csr(SBI_HART_PRIV_VER_1_11,
CSR_SCOUNTOVF, SBI_HART_EXT_SSCOFPMF);
/* Detect if hart supports time CSR */
csr_read_allowed(CSR_TIME, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_ZICNTR, true);
__check_ext_csr(SBI_HART_PRIV_VER_UNKNOWN,
CSR_TIME, SBI_HART_EXT_ZICNTR);
/* Detect if hart has AIA local interrupt CSRs */
csr_read_allowed(CSR_MTOPI, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SMAIA, true);
__check_ext_csr(SBI_HART_PRIV_VER_UNKNOWN,
CSR_MTOPI, SBI_HART_EXT_SMAIA);
/* Detect if hart supports stimecmp CSR(Sstc extension) */
if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
csr_read_allowed(CSR_STIMECMP, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SSTC, true);
}
__check_ext_csr(SBI_HART_PRIV_VER_1_12,
CSR_STIMECMP, SBI_HART_EXT_SSTC);
/* Detect if hart supports mstateen CSRs */
if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
val = csr_read_allowed(CSR_MSTATEEN0, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SMSTATEEN, true);
}
__check_ext_csr(SBI_HART_PRIV_VER_1_12,
CSR_MSTATEEN0, SBI_HART_EXT_SMSTATEEN);
/* Detect if hart supports smcntrpmf */
if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
csr_read_allowed(CSR_MCYCLECFG, (unsigned long)&trap);
if (!trap.cause)
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SMCNTRPMF, true);
}
__check_ext_csr(SBI_HART_PRIV_VER_1_12,
CSR_MCYCLECFG, SBI_HART_EXT_SMCNTRPMF);
#undef __check_ext_csr
/* Let platform populate extensions */
rc = sbi_platform_extensions_init(sbi_platform_thishart_ptr(),