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lib: sbi: simplify pmp_set(), pmp_get()

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pmpcfg_csr and pmpcfg_shift are only negative for an unexpected value of
__riscv_xlen. We can immediately return in this case.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Dong Du <Dd_nirvana@sjtu.edu.cn>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Heinrich Schuchardt
2021-12-17 18:02:58 +01:00
committed by Anup Patel
parent f270359810
commit 2082153fc9
1 changed files with 2 additions and 8 deletions
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10
lib/sbi/riscv_asm.c
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@@ -261,12 +261,9 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
pmpcfg_csr = (CSR_PMPCFG0 + (n >> 2)) & ~1;
pmpcfg_shift = (n & 7) << 3;
#else
pmpcfg_csr = -1;
pmpcfg_shift = -1;
return SBI_ENOTSUPP;
#endif
pmpaddr_csr = CSR_PMPADDR0 + n;
if (pmpcfg_csr < 0 || pmpcfg_shift < 0)
return SBI_ENOTSUPP;
/* encode PMP config */
prot &= ~PMP_A;
@@ -315,12 +312,9 @@ int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out,
pmpcfg_csr = (CSR_PMPCFG0 + (n >> 2)) & ~1;
pmpcfg_shift = (n & 7) << 3;
#else
pmpcfg_csr = -1;
pmpcfg_shift = -1;
return SBI_ENOTSUPP;
#endif
pmpaddr_csr = CSR_PMPADDR0 + n;
if (pmpcfg_csr < 0 || pmpcfg_shift < 0)
return SBI_ENOTSUPP;
/* decode PMP config */
cfgmask = (0xffUL << pmpcfg_shift);