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https://github.com/tillitis/tillitis-key1.git
synced 2025-03-12 01:56:43 -04:00
PoC: tb: Check security monitor read access protection
This commit is contained in:
Mikael Ågren
parent
0cc991fea2
commit
1968b3614c
@ -236,7 +236,6 @@ module tb_tk1 ();
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//----------------------------------------------------------------
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task reset_dut;
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begin
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$display("--- Toggle reset.");
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tb_reset_n = 0;
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#(2 * CLK_PERIOD);
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tb_reset_n = 1;
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@ -350,12 +349,16 @@ module tb_tk1 ();
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reg [31 : 0] read_data;
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tb_address = address;
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tb_cpu_instr = 1'h0;
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tb_cpu_valid = 1'h1;
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tb_we = 1'h0;
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tb_cs = 1'h1;
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#(CLK_PERIOD);
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read_data = tb_read_data;
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#(CLK_PERIOD);
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tb_cpu_valid = 1'h0;
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tb_cs = 1'h0;
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end
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endtask // read_word
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@ -430,6 +433,91 @@ module tb_tk1 ();
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end
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endtask // fetch_instruction
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// cpu_read_word()
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//
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// Read a data word from the given CPU address in the DUT.
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// the word read will be available in the global variable
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// tb_read_data.
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//----------------------------------------------------------------
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task cpu_read_word(input [31 : 0] address);
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begin : cpu_read_word
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reg [31 : 0] read_data;
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tb_cpu_addr = address;
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tb_address = tb_cpu_addr[13:2];
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tb_cpu_instr = 1'h0;
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tb_cpu_valid = 1'h1;
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tb_we = 1'h0;
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tb_cs = 1'h1;
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#(CLK_PERIOD);
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read_data = tb_read_data;
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#(CLK_PERIOD);
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tb_cpu_addr = 32'h0;
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tb_cpu_valid = 1'h0;
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tb_address = 12'h0;
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tb_cs = 1'h0;
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end
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endtask // read_word
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//----------------------------------------------------------------
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// cpu_read_check_range_should_trap()
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//
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// Read data in a range of CPU addresses (32-bit addresses). Fail
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// if trap signal is not asserted.
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// Range is inclusive.
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//----------------------------------------------------------------
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task cpu_read_check_range_should_trap(input [31 : 0] start_address, input [31 : 0] end_address);
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begin : read_check_range_should_not_trap
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reg [32 : 0] address;
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reg error_detected;
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address = start_address;
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error_detected = 0;
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while (!error_detected && (address <= end_address)) begin
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reset_dut();
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cpu_read_word(address);
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if (tb_force_trap == 0) begin
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$display("--- Error: Expected trap when reading from address 0x%08x", address);
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error_ctr += 1;
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error_detected = 1;
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end
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address += 1;
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end
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end
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endtask
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//----------------------------------------------------------------
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// cpu_read_check_range_should_not_trap()
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//
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// Read data in a range of CPU addresses (32-bit addresses). Fail
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// if trap signal is asserted.
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// Range is inclusive.
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//----------------------------------------------------------------
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task cpu_read_check_range_should_not_trap(input [31 : 0] start_address, input [31 : 0] end_address);
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begin : read_check_should_not_trap
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reg [31 : 0] address;
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reg error_detected;
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address = start_address;
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error_detected = 0;
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while (!error_detected && (address <= end_address)) begin
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reset_dut();
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cpu_read_word(address);
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if (tb_force_trap == 1) begin
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$display("--- Error: Did not expected trap when reading from address 0x%08x", address);
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error_ctr += 1;
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error_detected = 1;
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end
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address += 1;
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end
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end
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endtask
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//----------------------------------------------------------------
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// test1()
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@ -882,6 +970,96 @@ module tb_tk1 ();
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end
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endtask // test10
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//----------------------------------------------------------------
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// test11()
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// Test security monitor trap ranges.
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// - Check that reading accessible areas does not trap
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// - Check that reading the start and end of inaccessible areas
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// trap
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//----------------------------------------------------------------
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task test11;
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begin
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tc_ctr = tc_ctr + 1;
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$display("");
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$display("--- test11: Test trap ranges.");
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// ROM trap range: 0x00004000-0x3fffffff
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$display("--- test11: ROM");
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cpu_read_check_range_should_not_trap(32'h0, 32'h3fff);
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cpu_read_check_range_should_trap(32'h4000, 32'h400f);
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cpu_read_check_range_should_trap(32'h3ffffff0, 32'h3fffffff);
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// RAM trap range: 0x40020000-0x7fffffff
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$display("--- test11: RAM");
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cpu_read_check_range_should_not_trap(32'h40000000, 32'h4000000f);
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cpu_read_check_range_should_trap(32'h40020000, 32'h4002000f);
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cpu_read_check_range_should_trap(32'h7ffffff0, 32'h7fffffff);
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// Reserved trap range: 0x80000000-0xbfffffff
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$display("--- test11: Reserved");
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cpu_read_check_range_should_trap(32'h80000000, 32'h8000000f);
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cpu_read_check_range_should_trap(32'hbffffff0, 32'hbfffffff);
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// TRNG trap range: 0xc0000400-0xc0ffffff
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$display("--- test11: TRNG");
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cpu_read_check_range_should_not_trap(32'hc0000000, 32'hc00003ff);
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cpu_read_check_range_should_trap(32'hc0000400, 32'hc000040f);
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cpu_read_check_range_should_trap(32'hc0fffff0, 32'hc0ffffff);
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// TIMER trap range: 0xc1000400-0xc1ffffff
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$display("--- test11: TIMER");
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cpu_read_check_range_should_not_trap(32'hc1000000, 32'hc10003ff);
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cpu_read_check_range_should_trap(32'hc1000400, 32'hc100040f);
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cpu_read_check_range_should_trap(32'hc1fffff0, 32'hc1ffffff);
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// UDS trap range: 0xc2000020-0xc2ffffff
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$display("--- test11: UDS");
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cpu_read_check_range_should_not_trap(32'hc2000000, 32'hc200001f);
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cpu_read_check_range_should_trap(32'hc2000020, 32'hc200002f);
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cpu_read_check_range_should_trap(32'hc2fffff0, 32'hc2ffffff);
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// UART trap range: 0xc3000400-0xc3ffffff
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$display("--- test11: UART");
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cpu_read_check_range_should_not_trap(32'hc3000000, 32'hc30003ff);
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cpu_read_check_range_should_trap(32'hc3000400, 32'hc300040f);
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cpu_read_check_range_should_trap(32'hc3fffff0, 32'hc3ffffff);
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// TOUCH_SENSE trap range: 0xc4000400-0xc4ffffff
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$display("--- test11: TOUCH_SENSE");
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cpu_read_check_range_should_not_trap(32'hc4000000, 32'hc40003ff);
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cpu_read_check_range_should_trap(32'hc4000400, 32'hc400040f);
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cpu_read_check_range_should_trap(32'hc4fffff0, 32'hc4ffffff);
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// Unused trap range: 0xc5000000-0xcfffffff
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$display("--- test11: Unused");
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cpu_read_check_range_should_trap(32'hc5000000, 32'hc500000f);
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cpu_read_check_range_should_trap(32'hc5fffff0, 32'hc5ffffff);
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// FW_RAM trap range: 0xd0000800-0xd0ffffff
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$display("--- test11: FW_RAM");
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cpu_read_check_range_should_not_trap(32'hd0000000, 32'hd00007ff);
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cpu_read_check_range_should_trap(32'hd0000800, 32'hd000080f);
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cpu_read_check_range_should_trap(32'hd0fffff0, 32'hd0ffffff);
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// Unused trap range: 0xd1000000-0xfeffffff
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$display("--- test11: Unused");
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cpu_read_check_range_should_trap(32'hd1000000, 32'hd100000f);
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cpu_read_check_range_should_trap(32'hfefffff0, 32'hfeffffff);
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// TK1 trap range: 0xff000400-0xffffffff
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$display("--- test11: TK1");
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cpu_read_check_range_should_not_trap(32'hff000000, 32'hff0003ff);
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cpu_read_check_range_should_trap(32'hff000400, 32'hff00040f);
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cpu_read_check_range_should_trap(32'hfffffff0, 32'hffffffff);
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$display("--- test11: completed.");
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$display("");
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end
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endtask // test11
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//----------------------------------------------------------------
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// exit_with_error_code()
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//
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@ -921,6 +1099,7 @@ module tb_tk1 ();
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test9();
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test9();
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test10();
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test11();
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display_test_result();
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$display("");
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