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cxor($c6, $c6);
cxor($c6, $c6);
cxor($c7, $c7);
cxor($c7, $c7);
+
+ return;
+</pre>
+
+==== gen_tsec_key ====
+This is the method responsible for generating the final TSEC key. It takes '''key_addr''' and '''key_type''' as arguments.
+<pre>
+ // This will use TSEC DMA to look for 0x34C2E1DA in host1x scratch space
+ u32 host1x_res = check_host1x_magic();
+
+ // Failed to find magic word
+ if (host1x_res != 0)
+ return;
+ u32 crypto_reg_flag = 0x00000000;
+
+ // The next 0x02 xfer instructions will be overridden
+ // and target changes from DMA to crypto register
+ cxset(0x02);
+
+ // Transfer data to crypto register c0
+ xdst(0, (key_addr | crypto_reg_flag));
+ // Wait for all data loads/stores to finish
+ xdwait();
+
+ crypto_reg_flag = 0x00020000;
+
+ if (key_type == 0x01) // HOVI_EKS_01
+ {
+ // Load selected secret into crypto register c1
+ csecret($c1, 0x3F);
+
+ // Encrypt the auth signature with c1 and store in c1
+ csigenc($c1, $c1);
+ // Load selected secret into crypto register c2
+ csecret($c2, 0x00);
+
+ // Bind c2 register as the key for enc/dec operations
+ ckeyreg($c2);
+
+ // Encrypt the seed from key_addr and store in c2
+ cenc($c2, $c0);
+
+ // Bind c2 register as the key for enc/dec operations
+ ckeyreg($c2);
+
+ // Encrypt the auth signature with c2 and store in c2
+ csigenc($c2, $c2);
+ // Encrypt c1 and store in c2
+ cenc($c2, $c1);
+ // The next 0x02 xfer instructions will be overridden
+ // and target changes from DMA to crypto register
+ cxset(0x02);
+ // Transfer data from crypto register c2
+ xdld(0, (key_addr | crypto_reg_flag));
+ // Wait for all data loads/stores to finish
+ xdwait();
+ }
+ else if (key == 0x02) // HOVI_COMMON_01
+ {
+ // Load selected secret into crypto register c2
+ csecret($c2, 0x00);
+
+ // Bind c2 register as the key for enc/dec operations
+ ckeyreg($c2);
+
+ // Encrypt the seed from key_addr and store in c2
+ cenc($c2, $c0);
+
+ // Bind c2 register as the key for enc/dec operations
+ ckeyreg($c2);
+
+ // Encrypt the auth signature with c2 and store in c2
+ csigenc($c2, $c2);
+ // Encrypt c1 and store in c2
+ cenc($c2, $c1);
+ // The next 0x02 xfer instructions will be overridden
+ // and target changes from DMA to crypto register
+ cxset(0x02);
+ // Transfer data from crypto register c2
+ xdld(0, (key_addr | crypto_reg_flag));
+ // Wait for all data loads/stores to finish
+ xdwait();
+ }
+ // Use TSEC DMA to write the key in SOR1 registers
+ sor1_set_key(key_addr);
return;
return;