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`include "core/mmu/format.sv"
`include "core/uarch.sv"
module core_mmu_fault
(
input logic valid_entry,
skip_perms,
input word mmu_dac,
input mmu_domain domain,
input logic[1:0] ap,
output logic fault,
output mmu_fault_type fault_type
);
mmu_domain_ctrl domain_ctrl;
always_comb begin
unique case(domain)
4'h0: domain_ctrl = mmu_dac[1:0];
4'h1: domain_ctrl = mmu_dac[3:2];
4'h2: domain_ctrl = mmu_dac[5:4];
4'h3: domain_ctrl = mmu_dac[7:6];
4'h4: domain_ctrl = mmu_dac[9:8];
4'h5: domain_ctrl = mmu_dac[11:10];
4'h6: domain_ctrl = mmu_dac[13:12];
4'h7: domain_ctrl = mmu_dac[15:14];
4'h8: domain_ctrl = mmu_dac[17:16];
4'h9: domain_ctrl = mmu_dac[19:18];
4'ha: domain_ctrl = mmu_dac[21:20];
4'hb: domain_ctrl = mmu_dac[23:22];
4'hc: domain_ctrl = mmu_dac[25:24];
4'hd: domain_ctrl = mmu_dac[27:26];
4'he: domain_ctrl = mmu_dac[29:28];
4'hf: domain_ctrl = mmu_dac[31:30];
endcase
fault = 0;
fault_type = `MMU_FAULT_ACCESS;
if(!valid_entry) begin
fault = 1;
fault_type = `MMU_FAULT_WALK;
end else if(!skip_perms) begin
if(!domain_ctrl.allowed) begin
fault = 1;
fault_type = `MMU_FAULT_DOMAIN;
end else if(!domain_ctrl.manager)
unique case(ap)
2'b00:
fault = 1;
//TODO: los demás solo se tienen efecto para unprivileged
default: ;
endcase
end
end
endmodule
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