mirror of
https://github.com/openhwgroup/cvw
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123 lines
6.4 KiB
Systemverilog
123 lines
6.4 KiB
Systemverilog
// constants defining different privilege modes
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// defined in Table 1.1 of the privileged spec
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localparam M_MODE = (2'b11);
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localparam S_MODE = (2'b01);
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localparam U_MODE = (2'b00);
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// Virtual Memory Constants
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localparam VPN_SEGMENT_BITS = (XLEN == 32 ? 32'd10 : 32'd9);
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localparam VPN_BITS = (XLEN==32 ? (2*VPN_SEGMENT_BITS) : (4*VPN_SEGMENT_BITS));
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localparam PPN_BITS = (XLEN==32 ? 32'd22 : 32'd44);
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localparam PA_BITS = (XLEN==32 ? 32'd34 : 32'd56);
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localparam SVMODE_BITS = (XLEN==32 ? 32'd1 : 32'd4);
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localparam ASID_BASE = (XLEN==32 ? 32'd22 : 32'd44);
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localparam ASID_BITS = (XLEN==32 ? 32'd9 : 32'd16);
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// constants to check SATP_MODE against
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// defined in Table 4.3 of the privileged spec
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localparam NO_TRANSLATE = 4'd0;
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localparam SV32 = 4'd1;
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localparam SV39 = 4'd8;
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localparam SV48 = 4'd9;
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// macros to define supported modes
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localparam A_SUPPORTED = ((MISA >> 0) % 2 == 1);
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localparam B_SUPPORTED = ((ZBA_SUPPORTED | ZBB_SUPPORTED | ZBC_SUPPORTED | ZBS_SUPPORTED));// not based on MISA
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localparam C_SUPPORTED = ((MISA >> 2) % 2 == 1);
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localparam COMPRESSED_SUPPORTED = C_SUPPORTED | ZCA_SUPPORTED;
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localparam D_SUPPORTED = ((MISA >> 3) % 2 == 1);
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localparam E_SUPPORTED = ((MISA >> 4) % 2 == 1);
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localparam F_SUPPORTED = ((MISA >> 5) % 2 == 1);
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localparam I_SUPPORTED = ((MISA >> 8) % 2 == 1);
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localparam K_SUPPORTED = ((ZBKB_SUPPORTED | ZBKC_SUPPORTED | ZBKX_SUPPORTED | ZKND_SUPPORTED | ZKNE_SUPPORTED | ZKNH_SUPPORTED));
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localparam M_SUPPORTED = ((MISA >> 12) % 2 == 1);
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localparam Q_SUPPORTED = ((MISA >> 16) % 2 == 1);
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localparam S_SUPPORTED = ((MISA >> 18) % 2 == 1);
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localparam U_SUPPORTED = ((MISA >> 20) % 2 == 1);
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// N-mode user-level interrupts are depricated per Andrew Waterman 1/13/21
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// logarithm of XLEN, used for number of index bits to select
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localparam LOG_XLEN = (XLEN == 32 ? 32'd5 : 32'd6);
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// Number of 64 bit PMP Configuration Register entries (or pairs of 32 bit entries)
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localparam PMPCFG_ENTRIES = (PMP_ENTRIES/32'd8);
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// Floating point constants for Quad, Double, Single, and Half precisions
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// Lim: I've made some of these 64 bit to avoid width warnings.
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// If errors crop up, try downsizing back to 32.
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localparam Q_LEN = 32'd128;
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localparam Q_NE = 32'd15;
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localparam Q_NF = 32'd112;
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localparam Q_BIAS = 32'd16383;
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localparam Q_FMT = 2'd3;
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localparam D_LEN = 32'd64;
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localparam D_NE = 32'd11;
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localparam D_NF = 32'd52;
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localparam D_BIAS = 32'd1023;
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localparam D_FMT = 2'd1;
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localparam S_LEN = 32'd32;
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localparam S_NE = 32'd8;
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localparam S_NF = 32'd23;
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localparam S_BIAS = 32'd127;
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localparam S_FMT = 2'd0;
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localparam H_LEN = 32'd16;
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localparam H_NE = 32'd5;
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localparam H_NF = 32'd10;
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localparam H_BIAS = 32'd15;
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localparam H_FMT = 2'd2;
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// Floating point length FLEN and number of exponent (NE) and fraction (NF) bits (for longest format supported)
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localparam FLEN = Q_SUPPORTED ? Q_LEN : D_SUPPORTED ? D_LEN : S_LEN;
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localparam NE = Q_SUPPORTED ? Q_NE : D_SUPPORTED ? D_NE : S_NE;
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localparam NF = Q_SUPPORTED ? Q_NF : D_SUPPORTED ? D_NF : S_NF;
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localparam FMT = Q_SUPPORTED ? 2'd3 : D_SUPPORTED ? 2'd1 : 2'd0;
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localparam BIAS = Q_SUPPORTED ? Q_BIAS : D_SUPPORTED ? D_BIAS : S_BIAS;
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// Floating point constants needed for FPU paramerterization
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// LEN1/NE1/NF1/FNT1 is the size of the second longest supported format
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localparam FPSIZES = (32)'(Q_SUPPORTED)+(32)'(D_SUPPORTED)+(32)'(F_SUPPORTED)+(32)'(ZFH_SUPPORTED);
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localparam FMTBITS = (32)'(FPSIZES>=3)+1;
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localparam LEN1 = (FLEN > D_LEN) ? D_LEN : (FLEN > S_LEN) ? S_LEN : H_LEN;
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localparam NE1 = (FLEN > D_LEN) ? D_NE : (FLEN > S_LEN) ? S_NE : H_NE;
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localparam NF1 = (FLEN > D_LEN) ? D_NF : (FLEN > S_LEN) ? S_NF : H_NF;
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localparam FMT1 = (FLEN > D_LEN) ? 2'd1 : (FLEN > S_LEN) ? 2'd0 : 2'd2;
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localparam BIAS1 = (FLEN > D_LEN) ? D_BIAS : (FLEN > S_LEN) ? S_BIAS : H_BIAS;
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// LEN2 etc is the size of the third longest supported format
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localparam LEN2 = (LEN1 > S_LEN) ? S_LEN : H_LEN;
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localparam NE2 = (LEN1 > S_LEN) ? S_NE : H_NE;
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localparam NF2 = (LEN1 > S_LEN) ? S_NF : H_NF;
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localparam FMT2 = (LEN1 > S_LEN) ? 2'd0 : 2'd2;
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localparam BIAS2 = (LEN1 > S_LEN) ? S_BIAS : H_BIAS;
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// divider r and rk (bits per digit, bits per cycle)
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localparam LOGR = $clog2(RADIX); // r = log(R) bits per digit
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localparam RK = LOGR*DIVCOPIES; // r*k bits per cycle generated
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// intermediate division parameters not directly used in fdivsqrt hardware
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localparam FPDIVMINb = NF + 2; // minimum length of fractional part: Nf result bits + guard and round bits + 1 extra bit to allow sqrt being shifted right
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//localparam FPDIVMINb = NF + 2 + (RADIX == 2); // minimum length of fractional part: Nf result bits + guard and round bits + 1 extra bit for preshifting radix2 square root right, if radix4 doesn't use a right shift. This version saves one cycle on double-precision with R=4,k=4. However, it doesn't work yet because C is too short, so k is incorrectly calculated as a 1 in the lsb after the last step.
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localparam DIVMINb = ((FPDIVMINb<XLEN) & IDIV_ON_FPU) ? XLEN : FPDIVMINb; // minimum fractional bits b = max(XLEN, FPDIVMINb)
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localparam RESBITS = DIVMINb + LOGR; // number of bits in a result: r integer + b fractional
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// division constants
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localparam FPDUR = (RESBITS-1)/RK + 1 ; // ceiling((r+b)/rk)
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localparam DIVb = FPDUR*RK - LOGR; // divsqrt fractional bits, so total number of bits is a multiple of rk after r integer bits
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localparam DURLEN = $clog2(FPDUR); // enough bits to count the duration
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localparam DIVBLEN = $clog2(DIVb+1); // enough bits to count number of fractional bits + 1 integer bit
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// largest length in IEU/FPU
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localparam CVTLEN = ((NF<XLEN) ? (XLEN) : (NF)); // max(XLEN, NF)
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localparam LLEN = (($unsigned(FLEN)<$unsigned(XLEN)) ? ($unsigned(XLEN)) : ($unsigned(FLEN)));
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localparam LOGCVTLEN = $unsigned($clog2(CVTLEN+1));
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localparam NORMSHIFTSZ = (((CVTLEN+NF+1)>(DIVb + 1 +NF+1) & (CVTLEN+NF+1)>(3*NF+6)) ? (CVTLEN+NF+1) : ((DIVb + 1 +NF+1) > (3*NF+6) ? (DIVb + 1 +NF+1) : (3*NF+6))); // max(CVTLEN+NF+1, DIVb + 1 + NF + 1, 3*NF+6)
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localparam LOGNORMSHIFTSZ = ($clog2(NORMSHIFTSZ));
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localparam CORRSHIFTSZ = (NORMSHIFTSZ-2 > (DIVMINb + 1 + NF)) ? NORMSHIFTSZ-2 : (DIVMINb+1+NF); // max(NORMSHIFTSZ-2, DIVMINb + 1 + NF)
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// Disable spurious Verilator warnings
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/* verilator lint_off STMTDLY */
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/* verilator lint_off ASSIGNDLY */
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/* verilator lint_off PINCONNECTEMPTY */
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