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lib: sbi: Add sbi_hart_update_extension() function 

We add sbi_hart_update_extension() function which allow platforms
to enable/disable hart extensions.

Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel 2022-04-29 20:47:04 +05:30 committed by Anup Patel
parent be4903ae00
commit 994ace30f7
2 changed files with 41 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/sbi/sbi_hart.h
View File

@ -63,6 +63,9 @@ int sbi_hart_pmp_configure(struct sbi_scratch *scratch);
int sbi_hart_priv_version(struct sbi_scratch *scratch);
void sbi_hart_get_priv_version_str(struct sbi_scratch *scratch,
char *version_str, int nvstr);
void sbi_hart_update_extension(struct sbi_scratch *scratch,
enum sbi_hart_extensions ext,
bool enable);
bool sbi_hart_has_extension(struct sbi_scratch *scratch,
enum sbi_hart_extensions ext);
void sbi_hart_get_extensions_str(struct sbi_scratch *scratch,

43
lib/sbi/sbi_hart.c
View File

@ -367,6 +367,34 @@ void sbi_hart_get_priv_version_str(struct sbi_scratch *scratch,
sbi_snprintf(version_str, nvstr, "%s", temp);
}
static inline void __sbi_hart_update_extension(
struct hart_features *hfeatures,
enum sbi_hart_extensions ext,
bool enable)
{
if (enable)
hfeatures->extensions |= BIT(ext);
else
hfeatures->extensions &= ~BIT(ext);
}
/**
* Enable/Disable a particular hart extension
*
* @param scratch pointer to the HART scratch space
* @param ext the extension number to check
* @param enable new state of hart extension
*/
void sbi_hart_update_extension(struct sbi_scratch *scratch,
enum sbi_hart_extensions ext,
bool enable)
{
struct hart_features *hfeatures =
sbi_scratch_offset_ptr(scratch, hart_features_offset);
__sbi_hart_update_extension(hfeatures, ext, enable);
}
/**
* Check whether a particular hart extension is available
*
@ -620,31 +648,36 @@ __mhpm_skip:
/* Detect if hart supports sscofpmf */
csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap);
if (!trap.cause)
hfeatures->extensions |= BIT(SBI_HART_EXT_SSCOFPMF);
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SSCOFPMF, true);
}
/* Detect if hart supports time CSR */
csr_read_allowed(CSR_TIME, (unsigned long)&trap);
if (!trap.cause)
hfeatures->extensions |= BIT(SBI_HART_EXT_TIME);
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_TIME, true);
/* Detect if hart has AIA local interrupt CSRs */
csr_read_allowed(CSR_MTOPI, (unsigned long)&trap);
if (!trap.cause)
hfeatures->extensions |= BIT(SBI_HART_EXT_AIA);
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_AIA, true);
/* 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)
hfeatures->extensions |= BIT(SBI_HART_EXT_SSTC);
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SSTC, true);
}
/* 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)
hfeatures->extensions |= BIT(SBI_HART_EXT_SMSTATEEN);
__sbi_hart_update_extension(hfeatures,
SBI_HART_EXT_SMSTATEEN, true);
}
/* Mark hart feature detection done */