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lib: sbi_platform: Add callback to populate HART extensions

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We add platform specific extensions_init() callback which allows
platforms to populate HART extensions for each HART. For example,
the generic platform can populate HART extensions from HART ISA
string described in DeviceTree.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2022-04-29 21:02:24 +05:30
committed by Anup Patel
parent 994ace30f7
commit 023f0ad2d9
2 changed files with 32 additions and 4 deletions
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18
include/sbi/sbi_platform.h
View File

@@ -89,6 +89,9 @@ struct sbi_platform_operations {
*/
int (*misa_get_xlen)(void);
/** Initialize (or populate) HART extensions for the platform */
int (*extensions_init)(void);
/** Initialize (or populate) domains for the platform */
int (*domains_init)(void);
@@ -453,6 +456,21 @@ static inline int sbi_platform_misa_xlen(const struct sbi_platform *plat)
return -1;
}
/**
* Initialize (or populate) HART extensions for the platform
*
* @param plat pointer to struct sbi_platform
*
* @return 0 on success and negative error code on failure
*/
static inline int sbi_platform_extensions_init(
const struct sbi_platform *plat)
{
if (plat && sbi_platform_ops(plat)->extensions_init)
return sbi_platform_ops(plat)->extensions_init();
return 0;
}
/**
* Initialize (or populate) domains for the platform
*

18
lib/sbi/sbi_hart.c
View File

@@ -536,16 +536,17 @@ static int hart_pmu_get_allowed_bits(void)
return num_bits;
}
static void hart_detect_features(struct sbi_scratch *scratch)
static int hart_detect_features(struct sbi_scratch *scratch)
{
struct sbi_trap_info trap = {0};
struct hart_features *hfeatures =
sbi_scratch_offset_ptr(scratch, hart_features_offset);
unsigned long val, oldval;
int rc;
/* If hart features already detected then do nothing */
if (hfeatures->detected)
return;
return 0;
/* Clear hart features */
hfeatures->extensions = 0;
@@ -680,10 +681,15 @@ __mhpm_skip:
SBI_HART_EXT_SMSTATEEN, true);
}
/* Let platform populate extensions */
rc = sbi_platform_extensions_init(sbi_platform_thishart_ptr());
if (rc)
return rc;
/* Mark hart feature detection done */
hfeatures->detected = true;
return;
return 0;
}
int sbi_hart_reinit(struct sbi_scratch *scratch)
@@ -705,6 +711,8 @@ int sbi_hart_reinit(struct sbi_scratch *scratch)
int sbi_hart_init(struct sbi_scratch *scratch, bool cold_boot)
{
int rc;
if (cold_boot) {
if (misa_extension('H'))
sbi_hart_expected_trap = &__sbi_expected_trap_hext;
@@ -715,7 +723,9 @@ int sbi_hart_init(struct sbi_scratch *scratch, bool cold_boot)
return SBI_ENOMEM;
}
hart_detect_features(scratch);
rc = hart_detect_features(scratch);
if (rc)
return rc;
return sbi_hart_reinit(scratch);
}