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fpga: Add syscall interrupt

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Add syscall interrupt to be used for syscalls. The interrupt is
triggered by writing to an address in the 0xe1000000-0xe1ffffff

The PicoRV32 core is configured to use its minimal, non RISCV-standard,
interrupt implementation.
This commit is contained in:
Mikael Ågren 2024-12-03 17:33:59 +01:00
parent dd48b77047
commit 19ae709c81
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GPG key ID: E02DA3D397792C46
4 changed files with 118 additions and 17 deletions
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14
hw/application_fpga/core/tk1/rtl/tk1.v
View file

@ -45,6 +45,8 @@ module tk1 #(
output wire gpio3,
output wire gpio4,
input wire syscall,
input wire cs,
input wire we,
input wire [ 7 : 0] address,
@ -448,7 +450,17 @@ module tk1 #(
end
// In unused space
if ((cpu_addr[29 : 24] > 6'h10) && (cpu_addr[29 : 24] < 6'h3f)) begin
if ((cpu_addr[29 : 24] > 6'h10) && (cpu_addr[29 : 24] < 6'h21)) begin
force_trap_set = 1'h1;
end
// Outside SYSCALL
if (cpu_addr[29 : 24] == 6'h21 & |cpu_addr[23 : 2]) begin
force_trap_set = 1'h1;
end
// In unused space
if ((cpu_addr[29 : 24] > 6'h21) && (cpu_addr[29 : 24] < 6'h3f)) begin
force_trap_set = 1'h1;
end

11
hw/application_fpga/core/tk1/tb/tb_tk1.v
View file

@ -878,6 +878,17 @@ module tb_tk1 ();
// Unused trap range: 0xd1000000-0xfeffffff
$display("--- test11: Unused");
cpu_read_check_range_should_trap(32'hd1000000, 32'hd100000f);
cpu_read_check_range_should_trap(32'he0fffff0, 32'he0ffffff);
// SYSCALL trap range. 0xe1000004-0xe1ffffff
$display("--- test11: SYSCALL");
cpu_read_check_range_should_not_trap(32'he1000000, 32'he1000003);
cpu_read_check_range_should_trap(32'he1000004, 32'he100000f);
cpu_read_check_range_should_trap(32'he1fffff0, 32'he1ffffff);
// Unused trap range: 0xe2000000-0xfeffffff
$display("--- test11: Unused");
cpu_read_check_range_should_trap(32'he2000000, 32'he200000f);
cpu_read_check_range_should_trap(32'hfefffff0, 32'hfeffffff);
// TK1 trap range: 0xff000400-0xffffffff