pmp.h File Reference

RISC-V PMP configuration options. More...

Detailed Description

RISC-V PMP configuration options.

RISCV implementations using this peripheral must define the NUM_PMP_ENTRIES NUM_PMP_ENTRIES must be 16 or 64.

Author

Bennet Blischke

Definition in file pmp.h.

#include <assert.h>
#include <stdint.h>

Include dependency graph for pmp.h:

Go to the source code of this file.

Functions
static uint32_t	make_napot (uint32_t addr, uint32_t size)
	Create a NAPOT formatted address. More...
void	write_pmpcfg (uint8_t reg_num, uint32_t value)
	Writes a complete pmpcfg register. More...
uint32_t	read_pmpcfg (uint8_t reg_num)
	Read a complete pmpcfg register. More...
void	write_pmpaddr (uint8_t reg_num, uint32_t value)
	Writes a complete pmpaddr register. More...
uint32_t	read_pmpaddr (uint8_t reg_num)
	Read a complete pmpaddr register. More...
uint8_t	get_pmpcfg (uint8_t entry)
	Read a single pmpcfg sub-register. More...
void	set_pmpcfg (uint8_t entry, uint8_t value)
	Set's a single pmpcfg sub-register. More...
void	print_pmpcfg (uint8_t entry)
	Prints a single pmpcfg sub-register human readable. More...

Bit masks for the PMP configuration register
#define	PMP_NONE   0x00
	No access allowed at all.
#define	PMP_R   0x01
	Allow read access.
#define	PMP_W   0x02
	Allow write access.
#define	PMP_X   0x04
	Allow execution.
#define	PMP_A   0x18
	Addressing mode mask.
#define	PMP_OFF   0x00
	Disable this pmp entry.
#define	PMP_TOR   0x08
	Top-of-range addressing mode.
#define	PMP_NA4   0x10
	Naturally aligned four-byte region.
#define	PMP_NAPOT   0x18
	Naturally aligned power-of-two region, ≥8 bytes.
#define	PMP_L   0x80
	Lock; read-only config & applies to machine-mode.

Function Documentation

get_pmpcfg()

uint8_t get_pmpcfg

(

uint8_t

entry

)

Read a single pmpcfg sub-register.

Parameters

[in]

entry

Sub-register number

Returns

Contents of the specified sub-register

make_napot()

static uint32_t make_napot ( uint32_t  addr, uint32_t  size  )

inlinestatic

Create a NAPOT formatted address.

Parameters

addr	Base address, must be aligned to the size of the region
size	Size of the region in bytes

Definition at line 52 of file pmp.h.

print_pmpcfg()

void print_pmpcfg

(

uint8_t

entry

)

Prints a single pmpcfg sub-register human readable.

Parameters

entry

Register number to print

read_pmpaddr()

uint32_t read_pmpaddr

(

uint8_t

reg_num

)

Read a complete pmpaddr register.

Parameters

[in]

reg_num

Register number

Returns

Contents of the specified register

read_pmpcfg()

uint32_t read_pmpcfg

(

uint8_t

reg_num

)

Read a complete pmpcfg register.

Parameters

[in]

reg_num

Register number

Returns

Contents of the specified register

set_pmpcfg()

void set_pmpcfg	(	uint8_t	entry,
		uint8_t	value
	)

Set's a single pmpcfg sub-register.

Parameters

entry	Sub-register number
value	Value to write

write_pmpaddr()

void write_pmpaddr	(	uint8_t	reg_num,
		uint32_t	value
	)

Writes a complete pmpaddr register.

Parameters

reg_num	Register number
value	Value to write

write_pmpcfg()

void write_pmpcfg	(	uint8_t	reg_num,
		uint32_t	value
	)

Writes a complete pmpcfg register.

Parameters

reg_num	Register number
value	Value to write