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| author | Anup Patel <apatel@ventanamicro.com> | 2023-12-12 15:19:11 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-12-19 15:56:37 +0530 |
| commit | 2b80b92f028aa3726c6488eaaefddbdec43c5b54 (patch) | |
| tree | a25d4ede29df67f05a8a95e9d2ef7592f67ad156 /lib/sbi/sbi_hart.c | |
| parent | 5a57e8cd41f3c8754a5f0e511a63072724c1f0b7 (diff) | |
| download | opensbi-2b80b92f028aa3726c6488eaaefddbdec43c5b54.zip opensbi-2b80b92f028aa3726c6488eaaefddbdec43c5b54.tar.gz opensbi-2b80b92f028aa3726c6488eaaefddbdec43c5b54.tar.bz2 | |
lib: sbi: Do not enter OpenSBI with mseccfg.MML == 1
On platforms with Smepmp, the previous booting stage must enter
OpenSBI with mseccfg.MML == 0. This allows OpenSBI to configure
it's own M-mode only regions without depending on the previous
booting stage.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Diffstat (limited to 'lib/sbi/sbi_hart.c')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index 46cd55d..e2b93e6 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -914,6 +914,16 @@ __pmp_skip: /* Mark hart feature detection done */ hfeatures->detected = true; + /* + * On platforms with Smepmp, the previous booting stage must + * enter OpenSBI with mseccfg.MML == 0. This allows OpenSBI + * to configure it's own M-mode only regions without depending + * on the previous booting stage. + */ + if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMEPMP) && + (csr_read(CSR_MSECCFG) & MSECCFG_MML)) + return SBI_EILL; + return 0; } |