pmpcfg9
PMP Configuration Register 9
PMP entry configuration
Attributes
Defining Extension |
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CSR Address |
0x3a9 |
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Length |
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Privilege Mode |
M |
Software write
This CSR may store a value that is different from what software attempts to write.
When a software write occurs (e.g., through csrrw), the following determines the written value:
pmp36cfg = if ((CSR[pmpcfg9].pmp36cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp36cfg & 0x1) == 0) && ((csr_value.pmp36cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp36cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp36cfg; } } } # fall through: keep old value return CSR[pmpcfg9].pmp36cfg; pmp37cfg = if ((CSR[pmpcfg9].pmp37cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp37cfg & 0x1) == 0) && ((csr_value.pmp37cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp37cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp37cfg; } } } # fall through: keep old value return CSR[pmpcfg9].pmp37cfg; pmp38cfg = if ((CSR[pmpcfg9].pmp38cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp38cfg & 0x1) == 0) && ((csr_value.pmp38cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp38cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp38cfg; } } } # fall through: keep old value return CSR[pmpcfg9].pmp38cfg; pmp39cfg = if ((CSR[pmpcfg9].pmp39cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp39cfg & 0x1) == 0) && ((csr_value.pmp39cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp39cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp39cfg; } } } # fall through: keep old value return CSR[pmpcfg9].pmp39cfg;