mconfigptr

Machine Configuration Pointer

Holds a physical address pointer to the unified discovery data structure in Memory.

The mconfigptr holds the physical address of a configuration data structure. Software can traverse this data structure to discover information about the harts, the platform, and their configuration.

The pointer alignment in bits must be no smaller than MXLEN: i.e., if MXLEN is \(8\times n\), then mconfigptr[\(\log_2n\)-1:0] must be zero.

The mconfigptr register must be implemented, but it may be zero to indicate the configuration data structure does not exist or that an alternative mechanism must be used to locate it.

The format and schema of the configuration data structure have yet to be standardized.

While the mconfigptr register will simply be hardwired in some implementations, other implementations may provide a means to configure the value returned on CSR reads. For example, mconfigptr might present the value of a memory-mapped register that is programmed by the platform or by M-mode software towards the beginning of the boot process.

Attributes

CSR Address	0xf15
Defining extension	Sm, version >=1.12
Length	64-bit
Privilege Mode	M

CSR Address

0xf15

Defining extension

Sm, version >=1.12

Length

64-bit

Privilege Mode

Format

Figure 1. mconfigptr format

Field Summary

Name Location Type Reset Value

Name	Location	Type	Reset Value
`ADDRESS`	63:0	RO	4096

ADDRESS

63:0

4096

Fields

`ADDRESS`

Location: mconfigptr[63:0]
Description: Pointer to physical address of the Unified Discovery configuration data structure.
Type

RO	Read-Only Field has a hardwired value that does not change. Writes to an RO field are ignored.

Reset value: 4096