pmpcfg0

PMP Configuration Register 0

PMP entry configuration

Attributes

Defining Extension

Smpmp, version >= 0

CSR Address

0x3a0

Length

32-bit

64-bit

Privilege Mode

Format

This CSR format changes dynamically.

Field Summary

Name Location Type Reset Value

pmp0cfg

7:0

RW-R

UNDEFINED_LEGAL

pmp1cfg

15:8

RW-R

UNDEFINED_LEGAL

pmp2cfg

23:16

RW-R

UNDEFINED_LEGAL

pmp3cfg

31:24

RW-R

UNDEFINED_LEGAL

pmp4cfg

39:32

RW-R

UNDEFINED_LEGAL

pmp5cfg

47:40

RW-R

UNDEFINED_LEGAL

pmp6cfg

55:48

RW-R

UNDEFINED_LEGAL

pmp7cfg

63:56

RW-R

UNDEFINED_LEGAL

Fields

`pmp0cfg`

Location

7:0

Description

PMP configuration for entry 0

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 7 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 6:5 ! Reserved Writes shall be ignored.
h! A ! 4:3
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 2 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 1 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 0 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp1cfg`

Location

15:8

Description

PMP configuration for entry 1

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 15 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 14:13 ! Reserved Writes shall be ignored.
h! A ! 12:11
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 10 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 9 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 8 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp2cfg`

Location

23:16

Description

PMP configuration for entry 2

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 23 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 22:21 ! Reserved Writes shall be ignored.
h! A ! 20:19
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 18 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 17 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 16 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp3cfg`

Location

31:24

Description

PMP configuration for entry 3

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 31 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 30:29 ! Reserved Writes shall be ignored.
h! A ! 28:27
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 26 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 25 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 24 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp4cfg`

pmp4cfg is only defined in RV64 (CSR[misa].MXL == 1)

Location

39:32

Description

PMP configuration for entry 4

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 39 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 38:37 ! Reserved Writes shall be ignored.
h! A ! 36:35
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 34 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 33 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 32 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp5cfg`

pmp5cfg is only defined in RV64 (CSR[misa].MXL == 1)

Location

47:40

Description

PMP configuration for entry 5

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 47 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 46:45 ! Reserved Writes shall be ignored.
h! A ! 44:43
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 42 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 41 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 40 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp6cfg`

pmp6cfg is only defined in RV64 (CSR[misa].MXL == 1)

Location

55:48

Description

PMP configuration for entry 6

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 55 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 54:53 ! Reserved Writes shall be ignored.
h! A ! 52:51
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 50 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 49 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 48 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

`pmp7cfg`

pmp7cfg is only defined in RV64 (CSR[misa].MXL == 1)

Location

63:56

Description

PMP configuration for entry 7

The bits are as follows:

[separator="!",%autowidth]
!===
! Name ! Location ! Description

h! L ! 63 ! Locks the entry from further modification. Additionally, when set, PMP checks also apply to M-mode for the entry.
h! - ! 62:61 ! Reserved Writes shall be ignored.
h! A ! 60:59
a! Address matching mode. One of:

[when="PMP_GRANULARITY < 2"]

OFF (0) - Null region (disabled)
TOR (1) - Top of range
NA4 (2) - Naturally aligned four-byte region
NAPOT (3) - Natrually aligned power of two
+ [when="PMP_GRANULARITY >= 2"]
OFF (0) - Null region (disabled)
TOR (1) - Top of range
NAPOT (3) - Natrually aligned power of two

[when="PMP_GRANULARITY >= 2"]
Naturally aligned four-byte region, NA4 (2), is not valid (not needed when the PMP granularity is larger than 4 bytes).

h! X ! 58 ! When clear, instruction fetchs cause an Access Fault for the matching region and privilege mode.
h! W ! 57 ! When clear, stores and AMOs cause an Access Fault for the matching region and privilege mode.
h! R ! 56 ! When clear, loads cause an Access Fault for the matching region and privilege mode.
!===

The combination of R = 0, W = 1 is reserved.

Type

RW-R

Reset value

UNDEFINED_LEGAL

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:

pmp0cfg = if ((CSR[pmpcfg0].pmp0cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp0cfg & 0x1) == 0) && ((csr_value.pmp0cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp0cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp0cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp0cfg;

pmp1cfg = if ((CSR[pmpcfg0].pmp1cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp1cfg & 0x1) == 0) && ((csr_value.pmp1cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp1cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp1cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp1cfg;

pmp2cfg = if ((CSR[pmpcfg0].pmp2cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp2cfg & 0x1) == 0) && ((csr_value.pmp2cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp2cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp2cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp2cfg;

pmp3cfg = if ((CSR[pmpcfg0].pmp3cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp3cfg & 0x1) == 0) && ((csr_value.pmp3cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp3cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp3cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp3cfg;

pmp4cfg = if ((CSR[pmpcfg0].pmp4cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp4cfg & 0x1) == 0) && ((csr_value.pmp4cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp4cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp4cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp4cfg;

pmp5cfg = if ((CSR[pmpcfg0].pmp5cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp5cfg & 0x1) == 0) && ((csr_value.pmp5cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp5cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp5cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp5cfg;

pmp6cfg = if ((CSR[pmpcfg0].pmp6cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp6cfg & 0x1) == 0) && ((csr_value.pmp6cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp6cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp6cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp6cfg;

pmp7cfg = if ((CSR[pmpcfg0].pmp7cfg & 0x80) == 0) {
  # entry is not locked
  if (!(((csr_value.pmp7cfg & 0x1) == 0) && ((csr_value.pmp7cfg & 0x2) == 0x2))) {
    # not R = 0, W =1, which is reserved
    if ((PMP_GRANULARITY < 2) ||
        ((csr_value.pmp7cfg & 0x18) != 0x10)) {
      # NA4 is not allowed when PMP granularity is larger than 4 bytes
      return csr_value.pmp7cfg;
    }
  }
}
# fall through: keep old value
return CSR[pmpcfg0].pmp7cfg;