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lib: sbi: Add functions to manipulate PMP entries
- Add a function to disable a given PMP entry. - Add a function to check if a given entry is disabled. Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
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2 changed files with 48 additions and 0 deletions
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@ -181,6 +181,12 @@ int misa_xlen(void);
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/* Get RISC-V ISA string representation */
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void misa_string(int xlen, char *out, unsigned int out_sz);
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/* Disable pmp entry at a given index */
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int pmp_disable(unsigned int n);
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/* Check if the matching field is set */
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int is_pmp_entry_mapped(unsigned long entry);
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int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
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unsigned long log2len);
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@ -246,6 +246,48 @@ static unsigned long ctz(unsigned long x)
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return ret;
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}
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int pmp_disable(unsigned int n)
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{
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int pmpcfg_csr, pmpcfg_shift;
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unsigned long cfgmask, pmpcfg;
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if (n >= PMP_COUNT)
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return SBI_EINVAL;
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#if __riscv_xlen == 32
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pmpcfg_csr = CSR_PMPCFG0 + (n >> 2);
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pmpcfg_shift = (n & 3) << 3;
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#elif __riscv_xlen == 64
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pmpcfg_csr = (CSR_PMPCFG0 + (n >> 2)) & ~1;
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pmpcfg_shift = (n & 7) << 3;
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#else
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# error "Unexpected __riscv_xlen"
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#endif
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/* Clear the address matching bits to disable the pmp entry */
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cfgmask = ~(0xffUL << pmpcfg_shift);
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pmpcfg = (csr_read_num(pmpcfg_csr) & cfgmask);
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csr_write_num(pmpcfg_csr, pmpcfg);
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return SBI_OK;
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}
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int is_pmp_entry_mapped(unsigned long entry)
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{
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unsigned long prot;
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unsigned long addr;
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unsigned long log2len;
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pmp_get(entry, &prot, &addr, &log2len);
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/* If address matching bits are non-zero, the entry is enable */
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if (prot & PMP_A)
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return true;
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return false;
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}
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int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
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unsigned long log2len)
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{
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