From 12db6151bf7a1c896a6f4bb37d46992a3621caaf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Stro=CC=88mbergson?= <joachim@secworks.se>
Date: Tue, 18 Sep 2018 12:35:29 +0200
Subject: Adding API control bits to read and write key.

---
 src/rtl/keywrap.v | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'src/rtl/keywrap.v')

diff --git a/src/rtl/keywrap.v b/src/rtl/keywrap.v
index 786ab54..870a85c 100644
--- a/src/rtl/keywrap.v
+++ b/src/rtl/keywrap.v
@@ -77,6 +77,8 @@ module keywrap #(parameter ADDR_BITS = 13)
   localparam ADDR_CTRL        = 8'h08;
   localparam CTRL_INIT_BIT    = 0;
   localparam CTRL_NEXT_BIT    = 1;
+  localparam CTRL_READ_BIT    = 2;
+  localparam CTRL_WRITE_BIT   = 3;
 
   localparam ADDR_STATUS      = 8'h09;
   localparam STATUS_READY_BIT = 0;
@@ -122,6 +124,12 @@ module keywrap #(parameter ADDR_BITS = 13)
   reg next_reg;
   reg next_new;
 
+  reg read_reg;
+  reg read_new;
+
+  reg write_reg;
+  reg write_new;
+
   reg encdec_reg;
   reg keylen_reg;
   reg config_we;
@@ -191,6 +199,8 @@ module keywrap #(parameter ADDR_BITS = 13)
 
                     .init(init_reg),
                     .next(next_reg),
+                    .read(read_reg),
+                    .write(write_reg),
                     .encdec(encdec_reg),
 
                     .ready(core_ready),
@@ -226,6 +236,8 @@ module keywrap #(parameter ADDR_BITS = 13)
 
           init_reg         <= 1'h0;
           next_reg         <= 1'h0;
+          read_reg         <= 1'h0;
+          write_reg        <= 1'h0;
           encdec_reg       <= 1'h0;
           keylen_reg       <= 1'h0;
           rlen_reg         <= {RLEN_BITS{1'h0}};
@@ -241,6 +253,8 @@ module keywrap #(parameter ADDR_BITS = 13)
           valid_reg        <= core_valid;
           init_reg         <= init_new;
           next_reg         <= next_new;
+          read_reg         <= read_new;
+          write_reg        <= write_new;
           api_rd_delay_reg <= api_rd_delay_new;
 
           if (config_we)
@@ -273,6 +287,8 @@ module keywrap #(parameter ADDR_BITS = 13)
     begin : api
       init_new         = 1'h0;
       next_new         = 1'h0;
+      read_new         = 1'h0;
+      write_new        = 1'h0;
       config_we        = 1'h0;
       rlen_we          = 1'h0;
       key_we           = 1'h0;
@@ -296,8 +312,10 @@ module keywrap #(parameter ADDR_BITS = 13)
               // Write access
               if (address == {{PAD{1'h0}}, ADDR_CTRL})
                 begin
-                  init_new = write_data[CTRL_INIT_BIT];
-                  next_new = write_data[CTRL_NEXT_BIT];
+                  init_new  = write_data[CTRL_INIT_BIT];
+                  next_new  = write_data[CTRL_NEXT_BIT];
+                  read_new  = write_data[CTRL_READ_BIT];
+                  write_new = write_data[CTRL_WRITE_BIT];
                 end
 
               if (address == {{PAD{1'h0}}, ADDR_CONFIG})
@@ -332,7 +350,7 @@ module keywrap #(parameter ADDR_BITS = 13)
                 api_rd_delay_new = CORE_VERSION;
 
               if (address == {{PAD{1'h0}}, ADDR_CTRL})
-                api_rd_delay_new = {28'h0, keylen_reg, encdec_reg, next_reg, init_reg};
+                api_rd_delay_new = {26'h0, keylen_reg, encdec_reg, write_reg, read_reg, next_reg, init_reg};
 
               if (address == {{PAD{1'h0}}, ADDR_STATUS})
                 api_rd_delay_new = {30'h0, valid_reg, ready_reg};
-- 
cgit v1.2.3