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// ========== Copyright Header Begin ==========================================

// 

// OpenSPARC T1 Processor File: lsu_tlbdp.v

// Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.

// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.

// 

// The above named program is free software; you can redistribute it and/or

// modify it under the terms of the GNU General Public

// License version 2 as published by the Free Software Foundation.

// 

// The above named program is distributed in the hope that it will be 

// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// 

// You should have received a copy of the GNU General Public

// License along with this work; if not, write to the Free Software

// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

// 

// ========== Copyright Header End ============================================

`include        "lsu.h"

module lsu_tlbdp(/*AUTOARG*/

   // Outputs

   so, lsu_tlb_rd_data, tlb_pgnum_buf, tlb_pgnum_buf2,

   tlb_rd_tte_data_ie_buf, stb_cam_vld, tte_data_parity_error,

   tte_tag_parity_error, cache_way_hit_buf1, cache_way_hit_buf2,

   lsu_tlu_tte_pg_sz_g,

   // Inputs

   rclk, si, se, tlb_rd_tte_tag, tlb_rd_tte_data,

   lsu_tlb_data_rd_vld_g, tlb_pgnum, asi_internal_m, lsu_alt_space_m,

   tlb_cam_hit, ifu_lsu_ld_inst_e, lsu_dtlb_bypass_e,

   tlb_rd_tte_data_parity, tlb_rd_tte_tag_parity, cache_way_hit

   );

   input  rclk;

   input  si;

   input  se;

   output so;

input   [58:0]           tlb_rd_tte_tag ;         // tte tag from tlb

input   [42:0]          tlb_rd_tte_data ;        // tte data from tlb

input                   lsu_tlb_data_rd_vld_g ;  // select between tte tag/data rd.             

input [39:10]           tlb_pgnum;

input                   asi_internal_m;

   input                lsu_alt_space_m;

// **new**

output  [63:0]           lsu_tlb_rd_data ;       // tag or data rd from tlb

   output [39:10]        tlb_pgnum_buf;

   output [39:37]        tlb_pgnum_buf2;

//   output [42:0]         tlb_rd_tte_data_buf;

   output             tlb_rd_tte_data_ie_buf;

//======================================================

//stb cam vld mved from stb_rwctl    

input     tlb_cam_hit ;

input     ifu_lsu_ld_inst_e;

input     lsu_dtlb_bypass_e;

output    stb_cam_vld;

input    tlb_rd_tte_data_parity ; // data parity bit from tte data

input    tlb_rd_tte_tag_parity ;  // data parity bit from tte tag

output   tte_data_parity_error ;

output   tte_tag_parity_error ;

   input [3:0] cache_way_hit;

   output [3:0] cache_way_hit_buf1;

   output [3:0] cache_way_hit_buf2;

output  [2:0]           lsu_tlu_tte_pg_sz_g ;   // page-size of tte 

wire   tlb_rd_tte_data_27_22_sel_buf;

wire   tlb_rd_tte_data_21_16_sel_buf;

wire   tlb_rd_tte_data_15_13_sel_buf;

wire   lsu_tte_pg_sz_b2, lsu_tte_pg_sz_b1, lsu_tte_pg_sz_b0;

wire   pg_sz_b0, pg_sz_b1, pg_sz_b2;

//===============================================================

   wire   tlb_tte_data_mx_sel2, tlb_tte_data_mx_sel1, tlb_tte_data_mx_sel0;

//tlb_tte_data_mx_sel2 ;  // select for bits 21-19

//tlb_tte_data_mx_sel1 ;  // select for bits 18-16

//tlb_tte_data_mx_sel0 ;  // select for bits 15-13

   assign tlb_tte_data_mx_sel2 = tlb_rd_tte_data_27_22_sel_buf;

   assign tlb_tte_data_mx_sel1 = tlb_rd_tte_data_21_16_sel_buf;

   assign tlb_tte_data_mx_sel0 = tlb_rd_tte_data_15_13_sel_buf;

// assign  pg_sz_b0 = 

//  (~tlb_tte_data_mx_sel1 & tlb_tte_data_mx_sel0) | // 64K

//  ( tlb_tte_data_mx_sel1 & tlb_tte_data_mx_sel0) ; // 4M/256M

assign  pg_sz_b0 =  tlb_tte_data_mx_sel0;

assign  pg_sz_b1 =

  (~tlb_tte_data_mx_sel2 & tlb_tte_data_mx_sel1 &  tlb_tte_data_mx_sel0) ; // 4M

assign  pg_sz_b2 =

  ( tlb_tte_data_mx_sel2 & tlb_tte_data_mx_sel1 &  tlb_tte_data_mx_sel0) ; // 256M

assign  lsu_tte_pg_sz_b2 = pg_sz_b2 ;

assign  lsu_tte_pg_sz_b1 = pg_sz_b1 ;

assign  lsu_tte_pg_sz_b0 = pg_sz_b0 ;

assign lsu_tlu_tte_pg_sz_g[2:0] = {pg_sz_b2,pg_sz_b1,pg_sz_b0} ;

// CAM VLD GENERATION

// Unfortunately because of timing considerations, this cannot be qualified with

// flush and inst_vld. Must exclude other conditions though such as internal asi

// atomics etc !!! (NOTE : earlier version of inst_vld may be obtained.   

   wire   clk;

   assign   clk =rclk;

wire  dtlb_bypass_m ;

dff_s #(1) dtlb_bypass_stgm  (

  .din    (lsu_dtlb_bypass_e), .q (dtlb_bypass_m),

  .clk    (clk),

  .se     (se), .si (), .so ()

  );

dff_s #(1) ld_inst_vld_stgm  (

  .din    (ifu_lsu_ld_inst_e), .q (ld_inst_vld_m),

  .clk    (clk),

  .se     (se), .si (), .so ()

  );

assign  stb_cam_vld = ld_inst_vld_m & (tlb_cam_hit | dtlb_bypass_m) &

                      ~(asi_internal_m  & lsu_alt_space_m); //bug 4635, revisit

//======================================================================   

//buffer all inputs first

wire   [58:0]         tlb_rd_tte_tag_buf ;

wire   [42:0]         tlb_rd_tte_data_buf ;

wire                                lsu_tte_pg_sz_b1_buf;

wire                                lsu_tte_pg_sz_b0_buf;

wire                                lsu_tte_pg_sz_b2_buf;

wire   [39:10]        tlb_pgnum_l;

wire   [39:10]        tlb_pgnum_buf;

wire   [39:37]        tlb_pgnum_buf2;

//BUFFERS

   assign             tlb_rd_tte_tag_buf[58:0] = tlb_rd_tte_tag[58:0];

   assign             lsu_tte_pg_sz_b1_buf = lsu_tte_pg_sz_b1;

   assign             lsu_tte_pg_sz_b0_buf = lsu_tte_pg_sz_b0;

   assign             lsu_tte_pg_sz_b2_buf = lsu_tte_pg_sz_b2;

   //tlb_pgnum buffer

   assign             tlb_pgnum_l [39:10] = ~ tlb_pgnum[39:10];

   assign             tlb_pgnum_buf[39:10] = ~ tlb_pgnum_l[39:10];

   assign             tlb_pgnum_buf2[39:37] = ~ tlb_pgnum_l[39:37];

   assign             tlb_rd_tte_data_buf[42:0] = tlb_rd_tte_data[42:0];

   assign tlb_rd_tte_data_ie_buf =  tlb_rd_tte_data_buf [`STLB_DATA_IE];

   assign tlb_rd_tte_data_27_22_sel_buf = tlb_rd_tte_data_buf [`STLB_DATA_27_22_SEL];

   assign tlb_rd_tte_data_21_16_sel_buf = tlb_rd_tte_data_buf [`STLB_DATA_21_16_SEL];

   assign tlb_rd_tte_data_15_13_sel_buf = tlb_rd_tte_data_buf [`STLB_DATA_15_13_SEL];

wire    [63:0]   formatted_tte_tag, formatted_tte_data;

//=================================================================================================

//      Format TLB Tag 

//=================================================================================================

assign  formatted_tte_tag[63:0] =

        {

        tlb_rd_tte_tag_buf[58:56],

        tlb_rd_tte_tag_buf[55],

        // ECO 4265 begin

        tlb_rd_tte_tag_buf[`STLB_TAG_PARITY],     // Parity

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_27_22_V], // mxsel2 - b27:22 vld 

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_21_16_V], // mxsel1 - b21:16 vld

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_15_13_V], // mxsel0 - b15:13 vld

        {8{tlb_rd_tte_tag_buf[53]}},                                        // (8b)

        // ECO 4265 end

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_47_28_HI:`STLB_TAG_VA_47_28_LO],    // (20b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_27_22_HI:`STLB_TAG_VA_27_22_LO],    // (6b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_21_16_HI:`STLB_TAG_VA_21_16_LO],    // (6b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_15_13_HI:`STLB_TAG_VA_15_13_LO],    // (3b)

        tlb_rd_tte_tag_buf[`STLB_TAG_CTXT_12_0_HI:`STLB_TAG_CTXT_12_0_LO] // (13b)

        } ;

/*

assign  formatted_tte_tag[63:0] =

        {

        {16{tlb_rd_tte_tag_buf[54]}},                                       // (16b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_47_22_HI:`STLB_TAG_VA_47_22_LO],    // (26b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_21_20_HI:`STLB_TAG_VA_21_20_LO],    // (3b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_19],

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_18_17_HI:`STLB_TAG_VA_18_17_LO],    // (3b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_16],

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_15_14_HI:`STLB_TAG_VA_15_14_LO],    // (3b)

        tlb_rd_tte_tag_buf[`STLB_TAG_VA_13],

        tlb_rd_tte_tag_buf[`STLB_TAG_CTXT_12_7_HI:`STLB_TAG_CTXT_12_7_LO],  // (13b)

        tlb_rd_tte_tag_buf[`STLB_TAG_CTXT_6_0_HI:`STLB_TAG_CTXT_6_0_LO]

        } ;

*/

//=================================================================================================

//      Format TLB Data 

//=================================================================================================

assign  formatted_tte_data[63:0] =

        {

        tlb_rd_tte_tag_buf[`STLB_TAG_V],            // V    (1b)

        lsu_tte_pg_sz_b1_buf,                       // SZ   (2b)

        lsu_tte_pg_sz_b0_buf,

        tlb_rd_tte_data_buf[`STLB_DATA_NFO],        // NFO  (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_IE],         // IE   (1b)

        9'd0,                                       // Soft2

        1'b0,

        lsu_tte_pg_sz_b2_buf,                       // SZ   (1b)

        tlb_rd_tte_tag_buf[`STLB_TAG_U],            // U    (1b)

        // ECO 4265 - begin

        tlb_rd_tte_data_buf[`STLB_DATA_PARITY],      // Parity   (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_27_22_SEL],   // mxsel2_l (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_21_16_SEL],   // mxsel1_l (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_15_13_SEL],   // mxsel0_l (1b)

        2'd0,                                        // Unused Diag bits

        // ECO 4265 - end 

        1'b0,                                        // PA   (28b)

        tlb_rd_tte_data_buf[`STLB_DATA_PA_39_28_HI:`STLB_DATA_PA_39_28_LO],

        tlb_rd_tte_data_buf[`STLB_DATA_PA_27_22_HI:`STLB_DATA_PA_27_22_LO],

        tlb_rd_tte_data_buf[`STLB_DATA_PA_21_16_HI:`STLB_DATA_PA_21_16_LO],

        tlb_rd_tte_data_buf[`STLB_DATA_PA_15_13_HI:`STLB_DATA_PA_15_13_LO],

        6'd0,                                   // ?? 12-7 (6b)

        tlb_rd_tte_data_buf[`STLB_DATA_L],          // L    (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_CP],         // CP   (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_CV],         // CV   (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_E],          // E    (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_P],          // P    (1b)

        tlb_rd_tte_data_buf[`STLB_DATA_W],          // W    (1b)

        1'b0

        } ;

//=================================================================================================

//      Select TLB Read data / TLB Read tag

//=================================================================================================

assign lsu_tlb_rd_data[63:0] =

                lsu_tlb_data_rd_vld_g ? formatted_tte_data[63:0] : formatted_tte_tag[63:0];

//=================================================================================================

//      Calculate parity for TLB Tag and Data

//=================================================================================================

   wire lsu_rd_tte_data_parity, lsu_rd_tte_tag_parity;

assign  lsu_rd_tte_data_parity = ^tlb_rd_tte_data_buf[41:0] ;

assign  lsu_rd_tte_tag_parity =  ^{tlb_rd_tte_tag_buf[58:55],tlb_rd_tte_tag_buf[53:27],

                                tlb_rd_tte_tag_buf[25],tlb_rd_tte_tag_buf[23:0]} ;

assign  tte_data_parity_error =

  tlb_rd_tte_data_parity ^ lsu_rd_tte_data_parity ;

assign  tte_tag_parity_error  =

  tlb_rd_tte_tag_parity ^ lsu_rd_tte_tag_parity ;

   assign cache_way_hit_buf1[3:0] = cache_way_hit[3:0] ;

   assign cache_way_hit_buf2[3:0] = cache_way_hit[3:0];

endmodule