Subversion Repositories neorv32

  -- check access type and regions's permissions --

  -- check access type and regions's permissions --

  pmp_check_permission: process(pmp, pmp_ctrl_i, ctrl_i)

  pmp_check_permission: process(pmp, pmp_ctrl_i, ctrl_i)

  begin

  begin

    for r in 0 to PMP_NUM_REGIONS-1 loop -- iterate over all regions

    for r in 0 to PMP_NUM_REGIONS-1 loop -- iterate over all regions

      if ((ctrl_i(ctrl_priv_lvl_msb_c downto ctrl_priv_lvl_lsb_c) = priv_mode_u_c) or (pmp_ctrl_i(r)(pmp_cfg_l_c) = '1')) and -- user privilege level or locked pmp entry -> enforce permissions also for machine mode

      if ((ctrl_i(ctrl_priv_lvl_msb_c downto ctrl_priv_lvl_lsb_c) = priv_mode_u_c) or (pmp_ctrl_i(r)(pmp_cfg_l_c) = '1')) and -- user privilege level or locked pmp entry -> enforce permissions also for machine mode

        pmp.if_fault(r) <= pmp.i_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_x_c)); -- fetch access match no execute permission

        pmp.if_fault(r) <= pmp.i_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_x_c)); -- fetch access match no execute permission

        pmp.ld_fault(r) <= pmp.d_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_r_c)); -- load access match no read permission

        pmp.ld_fault(r) <= pmp.d_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_r_c)); -- load access match no read permission

        pmp.st_fault(r) <= pmp.d_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_w_c)); -- store access match no write permission

        pmp.st_fault(r) <= pmp.d_match(r) and (not pmp_ctrl_i(r)(pmp_cfg_w_c)); -- store access match no write permission

      else

      else

        pmp.if_fault(r) <= '0';

        pmp.if_fault(r) <= '0';