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| author | Alejandro Soto <alejandro@34project.org> | 2024-01-21 06:23:46 -0600 |
|---|---|---|
| committer | Alejandro Soto <alejandro@34project.org> | 2024-02-20 11:11:17 -0600 |
| commit | f3b18ead59ae02f95dabbf0a1dea40873a816975 (patch) | |
| tree | 8979e50f2a37f66a4cd27e937b480efe60d72cf7 /rtl/core/core_reg_map.sv | |
| parent | a8bc5a353ea997f73209b39377ee15a73e471237 (diff) | |
rtl: refactor filenames and directory hierarchy
Diffstat (limited to 'rtl/core/core_reg_map.sv')
| -rw-r--r-- | rtl/core/core_reg_map.sv | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/rtl/core/core_reg_map.sv b/rtl/core/core_reg_map.sv new file mode 100644 index 0000000..11085d4 --- /dev/null +++ b/rtl/core/core_reg_map.sv @@ -0,0 +1,30 @@ +`include "core/uarch.sv" + +module core_reg_map +( + input reg_num r, + input psr_mode mode, + output logic is_pc, + output reg_index index +); + + reg_index usr; + assign usr = {1'b0, r}; + + always_comb begin + index = 5'bxxxxx; + is_pc = r == `R15; + + if(~is_pc) + unique case(mode) + `MODE_USR, `MODE_SYS: index = usr; + `MODE_FIQ: index = r >= 8 ? usr + 7 : usr; + `MODE_IRQ: index = r >= 13 ? usr + 9 : usr; + `MODE_UND: index = r >= 13 ? usr + 11 : usr; + `MODE_ABT: index = r >= 13 ? usr + 13 : usr; + `MODE_SVC: index = r >= 13 ? usr + 15 : usr; + default: ; + endcase + end + +endmodule |