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lib: sbi_hsm: Save/restore menvcfg only when it exists 

Attempting to access the menvcfg CSR raises an illegal instruction
exception on hardware which implements Sm1p11 or older.

Fixes: e9ee9678ba ("lib: sbi: fwft: add support for SBI_FWFT_PTE_AD_HW_UPDATING")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland 2024-07-10 07:26:06 -07:00 committed by Anup Patel
parent f7a92f6b67
commit 4afb57c9eb
1 changed files with 8 additions and 4 deletions
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12
lib/sbi/sbi_hsm.c
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@ -423,10 +423,12 @@ 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);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_12) {
#if __riscv_xlen == 32
hdata->saved_menvcfgh = csr_read(CSR_MENVCFGH);
hdata->saved_menvcfgh = csr_read(CSR_MENVCFGH);
#endif
hdata->saved_menvcfg = csr_read(CSR_MENVCFG);
hdata->saved_menvcfg = csr_read(CSR_MENVCFG);
}
}
static void __sbi_hsm_suspend_non_ret_restore(struct sbi_scratch *scratch)
@ -434,10 +436,12 @@ 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_MENVCFG, hdata->saved_menvcfg);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_12) {
csr_write(CSR_MENVCFG, hdata->saved_menvcfg);
#if __riscv_xlen == 32
csr_write(CSR_MENVCFGH, hdata->saved_menvcfgh);
csr_write(CSR_MENVCFGH, hdata->saved_menvcfgh);
#endif
}
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)));