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lib: sbi: fwft: add support for SBI_FWFT_MISALIGNED_EXC_DELEG

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Add support for SBI_FWFT_MISALIGNED_EXC_DELEG withing FWFT support. This
support allows to delegate misaligned accesses traps.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger 2024-06-19 11:42:40 +02:00 committed by Anup Patel
parent aa5a859369
commit c97a1d5891
2 changed files with 41 additions and 1 deletions
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39
lib/sbi/sbi_fwft.c
View File

@ -32,6 +32,8 @@ static unsigned long fwft_ptr_offset;
#define fwft_set_hart_state_ptr(__scratch, __phs) \
sbi_scratch_write_type((__scratch), void *, fwft_ptr_offset, (__phs))
#define MIS_DELEG (1UL << CAUSE_MISALIGNED_LOAD | 1UL << CAUSE_MISALIGNED_STORE)
struct fwft_config;
struct fwft_feature {
@ -71,6 +73,33 @@ static bool fwft_is_defined_feature(enum sbi_fwft_feature_t feature)
return false;
}
static int fwft_misaligned_delegation_supported(struct fwft_config *conf)
{
if (!misa_extension('S'))
return SBI_ENOTSUPP;
return SBI_OK;
}
static int fwft_set_misaligned_delegation(struct fwft_config *conf,
unsigned long value)
{
if (value)
csr_set(CSR_MEDELEG, MIS_DELEG);
else
csr_clear(CSR_MEDELEG, MIS_DELEG);
return SBI_OK;
}
static int fwft_get_misaligned_delegation(struct fwft_config *conf,
unsigned long *value)
{
*value = (csr_read(CSR_MEDELEG) & MIS_DELEG) != 0;
return SBI_OK;
}
static struct fwft_config* get_feature_config(enum sbi_fwft_feature_t feature)
{
int i;
@ -148,7 +177,15 @@ int sbi_fwft_get(enum sbi_fwft_feature_t feature, unsigned long *out_val)
return conf->feature->get(conf, out_val);
}
static const struct fwft_feature features[] = {};
static const struct fwft_feature features[] =
{
{
.id = SBI_FWFT_MISALIGNED_EXC_DELEG,
.supported = fwft_misaligned_delegation_supported,
.set = fwft_set_misaligned_delegation,
.get = fwft_get_misaligned_delegation,
},
};
int sbi_fwft_init(struct sbi_scratch *scratch, bool cold_boot)
{

3
lib/sbi/sbi_hsm.c
View File

@ -44,6 +44,7 @@ struct sbi_hsm_data {
unsigned long suspend_type;
unsigned long saved_mie;
unsigned long saved_mip;
unsigned long saved_medeleg;
atomic_t start_ticket;
};
@ -417,6 +418,7 @@ void __sbi_hsm_suspend_non_ret_save(struct sbi_scratch *scratch)
hdata->saved_mie = csr_read(CSR_MIE);
hdata->saved_mip = csr_read(CSR_MIP) & (MIP_SSIP | MIP_STIP);
hdata->saved_medeleg = csr_read(CSR_MEDELEG);
}
static void __sbi_hsm_suspend_non_ret_restore(struct sbi_scratch *scratch)
@ -424,6 +426,7 @@ static void __sbi_hsm_suspend_non_ret_restore(struct sbi_scratch *scratch)
struct sbi_hsm_data *hdata = sbi_scratch_offset_ptr(scratch,
hart_data_offset);
csr_write(CSR_MEDELEG, hdata->saved_medeleg);
csr_write(CSR_MIE, hdata->saved_mie);
csr_set(CSR_MIP, (hdata->saved_mip & (MIP_SSIP | MIP_STIP)));
}