Module ibex_pmp

ibex_pmp #( .DmBaseAddr(DmBaseAddr), .DmAddrMask(DmAddrMask), .PMPGranularity(PMPGranularity), .PMPNumChan(PMPNumChan), .PMPNumRegions(PMPNumRegions) ) u_ibex_pmp ( .csr_pmp_cfg_i(csr_pmp_cfg_i), .csr_pmp_addr_i(csr_pmp_addr_i), .csr_pmp_mseccfg_i(csr_pmp_mseccfg_i), .debug_mode_i(debug_mode_i), .priv_mode_i(priv_mode_i), .pmp_req_addr_i(pmp_req_addr_i), .pmp_req_type_i(pmp_req_type_i), .pmp_req_err_o(pmp_req_err_o) );

Block Diagram of ibex_pmp

Parameters

Name	Default	Description
DmBaseAddr	32'h1A110000
DmAddrMask	32'h00000FFF
PMPGranularity	0	Granularity of NAPOT access, 0 = No restriction, 1 = 8 byte, 2 = 16 byte, 3 = 32 byte, etc.
PMPNumChan	2	Number of access channels (e.g. i-side + d-side)
PMPNumRegions	4	Number of implemented regions

Ports

Name	Type	Direction	Description
csr_pmp_cfg_i	wire pmp_cfg_t	input	Interface to CSRs
csr_pmp_addr_i	wire logic [33 : 0]	input
csr_pmp_mseccfg_i	wire ibex_pkg::pmp_mseccfg_t	input
debug_mode_i	wire logic	input
priv_mode_i	wire priv_lvl_e	input
pmp_req_addr_i	wire logic [33 : 0]	input	Access checking channels
pmp_req_type_i	wire pmp_req_e	input
pmp_req_err_o	var logic	output

Functions

function logic

mml_perm_check(ibex_pkg::pmp_cfg_t region_csr_pmp_cfg, ibex_pkg::pmp_req_e pmp_req_type, ibex_pkg::priv_lvl_e priv_mode, logic permission_check)

Compute permissions checks that apply when MSECCFG.MML is set. Added for Smepmp support.

Parameters:

• region_csr_pmp_cfg (ibex_pkg::pmp_cfg_t)

• pmp_req_type (ibex_pkg::pmp_req_e)

• priv_mode (ibex_pkg::priv_lvl_e)

• permission_check (logic)

function logic

orig_perm_check(logic pmp_cfg_lock, ibex_pkg::priv_lvl_e priv_mode, logic permission_check)

Compute permissions checks that apply when MSECCFG.MML is unset. This is the original PMP behaviour before Smepmp was added.

Parameters:

• pmp_cfg_lock (logic)

• priv_mode (ibex_pkg::priv_lvl_e)

• permission_check (logic)

function logic

perm_check_wrapper(logic csr_pmp_mseccfg_mml, ibex_pkg::pmp_cfg_t region_csr_pmp_cfg, ibex_pkg::pmp_req_e pmp_req_type, ibex_pkg::priv_lvl_e priv_mode, logic permission_check)

A wrapper function in which it is decided which form of permission check function gets called

Parameters:

• csr_pmp_mseccfg_mml (logic)

• region_csr_pmp_cfg (ibex_pkg::pmp_cfg_t)

• pmp_req_type (ibex_pkg::pmp_req_e)

• priv_mode (ibex_pkg::priv_lvl_e)

• permission_check (logic)

function logic

access_fault_check(logic csr_pmp_mseccfg_mmwp, logic csr_pmp_mseccfg_mml, ibex_pkg::pmp_req_e pmp_req_type, logic[PMPNumRegions-1:0] match_all, ibex_pkg::priv_lvl_e priv_mode, logic[PMPNumRegions-1:0] final_perm_check)

Access fault determination / prioritization

Parameters:

• csr_pmp_mseccfg_mmwp (logic)

• csr_pmp_mseccfg_mml (logic)

• pmp_req_type (ibex_pkg::pmp_req_e)

• match_all (logic[PMPNumRegions-1:0])

• priv_mode (ibex_pkg::priv_lvl_e)

• final_perm_check (logic[PMPNumRegions-1:0])

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