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https://github.com/openhwgroup/cvw
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52 lines
2.5 KiB
Systemverilog
52 lines
2.5 KiB
Systemverilog
//////////////////////////////////////////
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// wally-constants.vh
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//
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// Written: tfleming@hmc.edu 4 March 2021
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// Modified: Kmacsaigoren@hmc.edu 31 May 2021
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// Added constants for checking sv mode and changed existing constants to accomodate
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// both sv48 and sv39
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//
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// Purpose: Specify constants nexessary for different memory virtualization modes.
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// These are specific to sv49, defined in section 4.5 of the privileged spec.
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// However, despite different constants for different modes, the hardware helps distinguish between
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// each mode.
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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// constants defining different privilege modes
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// defined in Table 1.1 of the privileged spec
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`define M_MODE (2'b11)
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`define S_MODE (2'b01)
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`define U_MODE (2'b00)
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// Virtual Memory Constants
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`define VPN_SEGMENT_BITS (`XLEN == 32 ? 10 : 9)
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`define VPN_BITS (`XLEN==32 ? (2*`VPN_SEGMENT_BITS) : (4*`VPN_SEGMENT_BITS))
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`define PPN_BITS (`XLEN==32 ? 22 : 44)
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`define PA_BITS (`XLEN==32 ? 34 : 56)
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`define SVMODE_BITS (`XLEN==32 ? 1 : 4)
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`define ASID_BASE (`XLEN==32 ? 22 : 44)
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`define ASID_BITS (`XLEN==32 ? 9 : 16)
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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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`define NO_TRANSLATE 0
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`define SV32 1
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`define SV39 8
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`define SV48 9
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