pmpcfg3
PMP Configuration Register 3
PMP entry configuration
Attributes
Defining Extension |
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CSR Address |
0x3a3 |
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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:
pmp12cfg = if ((CSR[pmpcfg3].pmp12cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp12cfg & 0x1) == 0) && ((csr_value.pmp12cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp12cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp12cfg; } } } # fall through: keep old value return CSR[pmpcfg3].pmp12cfg; pmp13cfg = if ((CSR[pmpcfg3].pmp13cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp13cfg & 0x1) == 0) && ((csr_value.pmp13cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp13cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp13cfg; } } } # fall through: keep old value return CSR[pmpcfg3].pmp13cfg; pmp14cfg = if ((CSR[pmpcfg3].pmp14cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp14cfg & 0x1) == 0) && ((csr_value.pmp14cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp14cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp14cfg; } } } # fall through: keep old value return CSR[pmpcfg3].pmp14cfg; pmp15cfg = if ((CSR[pmpcfg3].pmp15cfg & 0x80) == 0) { # entry is not locked if (!(((csr_value.pmp15cfg & 0x1) == 0) && ((csr_value.pmp15cfg & 0x2) == 0x2))) { # not R = 0, W =1, which is reserved if ((PMP_GRANULARITY < 2) || ((csr_value.pmp15cfg & 0x18) != 0x10)) { # NA4 is not allowed when PMP granularity is larger than 4 bytes return csr_value.pmp15cfg; } } } # fall through: keep old value return CSR[pmpcfg3].pmp15cfg;