Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

lib: sbi: Convert hart features into hart extensions

Browse Source 
Since past few years, we have been using "hart features" in OpenSBI
to represent all optionalities and multi-letter extensions defined
by the RISC-V specifications.

The RISC-V profiles specification has taken a different approach and
started assigning extension names for all optionalities which did not
have any extension name previously.
(Refer, https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc)

Inspired from the RISC-V profiles specification, we convert OpenSBI
hart features into hart extensions. Going forward, we align the
extension naming with RISC-V profiles specification. Currently, only
"time CSR" and "AIA CSR" have not been assigned extension name but
for everything else we have a name.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2022-04-28 21:29:22 +05:30
committed by Anup Patel
parent a6ab94fdbf
commit cad6c91045
7 changed files with 86 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
include/sbi/sbi_hart.h
View File

@@ -24,21 +24,21 @@ enum sbi_hart_priv_versions {
SBI_HART_PRIV_VER_1_12 = 3,
};
/** Possible feature flags of a hart */
enum sbi_hart_features {
/** Hart has sscofpmf extension */
SBI_HART_HAS_SSCOFPMF = (1 << 0),
/** HART has timer csr implementation in hardware */
SBI_HART_HAS_TIME = (1 << 1),
/** HART has AIA local interrupt CSRs */
SBI_HART_HAS_AIA = (1 << 2),
/** HART has mstateen CSR **/
SBI_HART_HAS_SMSTATEEN = (1 << 3),
/** HART has SSTC extension implemented in hardware */
SBI_HART_HAS_SSTC = (1 << 4),
/** Possible ISA extensions of a hart */
enum sbi_hart_extensions {
/** Hart has Sscofpmt extension */
SBI_HART_EXT_SSCOFPMF = 0,
/** HART has HW time CSR (extension name not available) */
SBI_HART_EXT_TIME,
/** HART has AIA CSRs (extension name not available) */
SBI_HART_EXT_AIA,
/** HART has Smstateen CSR **/
SBI_HART_EXT_SMSTATEEN,
/** HART has Sstc extension */
SBI_HART_EXT_SSTC,
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_SSTC,
/** Maximum index of Hart extension */
SBI_HART_EXT_MAX,
};
struct sbi_scratch;
@@ -63,9 +63,10 @@ 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);
bool sbi_hart_has_feature(struct sbi_scratch *scratch, unsigned long feature);
void sbi_hart_get_features_str(struct sbi_scratch *scratch,
char *features_str, int nfstr);
bool sbi_hart_has_extension(struct sbi_scratch *scratch,
enum sbi_hart_extensions ext);
void sbi_hart_get_extensions_str(struct sbi_scratch *scratch,
char *extension_str, int nestr);
void __attribute__((noreturn)) sbi_hart_hang(void);