Rename PmpPlugin -> PmpPluginNapot, PmpPluginOld -> PmpPlugin
This commit is contained in:
Leon Schuermann
parent
9baba6d11f
commit
cdd8454349
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@ -44,6 +44,7 @@
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- [StaticMemoryTranslatorPlugin](#staticmemorytranslatorplugin)
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- [MmuPlugin](#mmuplugin)
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- [PmpPlugin](#pmpplugin)
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- [PmpPluginNapot](#pmppluginnapot)
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- [DebugPlugin](#debugplugin)
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- [EmbeddedRiscvJtag](#embeddedRiscvJtag)
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- [YamlPlugin](#yamlplugin)
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@ -1234,7 +1235,11 @@ fully associative TLB cache which is refilled automaticaly via a dbus access sha
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#### PmpPlugin
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This is a physical memory protection (PMP) plugin which conforms to the latest RISC-V privilege specification. PMP is configured by writing two special CSRs: `pmpcfg#` and `pmpaddr#`. The former contains the permissions and addressing modes for four protection regions, and the latter contains the encoded start address for a single region. Since the actual region bounds must be computed from the values written to these registers, writing them takes a few CPU cylces. This delay is necessary in order to centralize all of the decoding logic into a single component. Otherwise, it would have to be duplicated for each region, even though the decoding operation happens only when PMP is reprogrammed (e.g., on some context switches).
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This is a physical memory protection (PMP) plugin which conforms to the v1.12 RISC-V privilege specification, without ePMP (`Smepmp`) extension support. PMP is configured by writing two special CSRs: `pmpcfg#` and `pmpaddr#`. The former contains the permissions and addressing modes for four protection regions, and the latter contains the encoded start address for a single region. Since the actual region bounds must be computed from the values written to these registers, writing them takes a few CPU cylces. This delay is necessary in order to centralize all of the decoding logic into a single component. Otherwise, it would have to be duplicated for each region, even though the decoding operation happens only when PMP is reprogrammed (e.g., on some context switches).
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##### PmpPluginNapot
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The `PmpPluginNapot` is a specialized PMP implementation, providing only the `NAPOT` (naturally-aligned poser-of-2 regions) addressing mode. It requires fewer resources and has a less significant timing impact compared to the full `PmpPlugin`.
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#### DebugPlugin
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@ -41,7 +41,6 @@ object GenSecure extends App {
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),
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new PmpPlugin(
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regions = 16,
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granularity = 32,
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ioRange = _(31 downto 28) === 0xf
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),
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new DecoderSimplePlugin(
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2021 Samuel Lindemer <samuel.lindemer@ri.se>
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* Copyright (c) 2020 Samuel Lindemer <samuel.lindemer@ri.se>
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*
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* SPDX-License-Identifier: MIT
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*/
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@ -7,10 +7,9 @@
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package vexriscv.plugin
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import vexriscv.{VexRiscv, _}
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import vexriscv.plugin.MemoryTranslatorPort.{_}
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import spinal.core._
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import spinal.lib._
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import spinal.lib.fsm._
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import scala.collection.mutable.ArrayBuffer
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/* Each 32-bit pmpcfg# register contains four 8-bit configuration sections.
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* These section numbers contain flags which apply to regions defined by the
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@ -62,60 +61,130 @@ import spinal.lib.fsm._
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*
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* NA4: This is essentially an edge case of NAPOT where the entire pmpaddr#
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* register defines a 4-byte wide region.
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*
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* N.B. THIS IMPLEMENTATION ONLY SUPPORTS NAPOT ADDRESSING. REGIONS ARE NOT
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* ORDERED BY PRIORITY. A PERMISSION IS GRANTED TO AN ACCESS IF ANY MATCHING
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* PMP REGION HAS THAT PERMISSION ENABLED.
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*/
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trait Pmp {
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case class PmpRegister(previous : PmpRegister) extends Area {
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def OFF = 0
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def TOR = 1
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def NA4 = 2
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def NAPOT = 3
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def xlen = 32
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def rBit = 0
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def wBit = 1
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def xBit = 2
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def aBits = 4 downto 3
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def lBit = 7
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}
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class PmpSetter(cutoff : Int) extends Component with Pmp {
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val io = new Bundle {
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val addr = in UInt(xlen bits)
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val base, mask = out UInt(xlen - cutoff bits)
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val state = new Area {
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val r, w, x = Reg(Bool)
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val l = RegInit(False)
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val a = Reg(UInt(2 bits)) init(0)
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val addr = Reg(UInt(32 bits))
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}
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val ones = io.addr & ~(io.addr + 1)
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io.base := io.addr(xlen - 3 downto cutoff - 2) ^ ones(xlen - 3 downto cutoff - 2)
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io.mask := ~(ones(xlen - 4 downto cutoff - 2) @@ U"1")
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// CSR writes connect to these signals rather than the internal state
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// registers. This makes locking and WARL possible.
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val csr = new Area {
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val r, w, x = Bool
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val l = Bool
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val a = UInt(2 bits)
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val addr = UInt(32 bits)
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}
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// Last valid assignment wins; nothing happens if a user-initiated write did
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// not occur on this clock cycle.
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csr.r := state.r
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csr.w := state.w
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csr.x := state.x
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csr.l := state.l
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csr.a := state.a
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csr.addr := state.addr
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// Computed PMP region bounds
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val region = new Area {
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val valid, locked = Bool
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// The calculated start & end addresses can overflow xlen by 4 bit:
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//
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// - 2 bit, as the pmpaddrX registers are defined as to encode
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// [XLEN + 2 downto 2] addresses.
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//
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// - 2 bit, as for NAPOT the most significant 0 bit encodes the region
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// length, with this bit included in the range!
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//
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// This means that (for xlen == 32 bit)
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//
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// pmpcfg(X / 4)(X % 4) = NAPOT
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// pmpaddrX = 0xFFFFFFFF
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//
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// will expand to
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//
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// start (inclusive): 0x000000000 << 2
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// end (exclusive): 0x200000000 << 2
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//
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// hence requiring xlen + 2 + 2 bit to represent the exclusive end
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// address. This could be optimized by using a saturating add, or making the
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// end address exclusive.
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val start, end = UInt(36 bits)
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}
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when(~state.l) {
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state.r := csr.r
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state.w := csr.w
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state.x := csr.x
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state.l := csr.l
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state.a := csr.a
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state.addr := csr.addr
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if (csr.l == True & csr.a == TOR) {
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previous.state.l := True
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}
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}
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// Extend state.addr to 36 bits, to avoid these computations overflowing (as
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// explained above):
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val extended_addr = (B"00" ## state.addr.asBits).asUInt
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val shifted = extended_addr << 2
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val mask = extended_addr ^ (extended_addr + 1)
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val masked = (extended_addr & ~mask) << 2
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// PMP changes take effect two clock cycles after the initial CSR write (i.e.,
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// settings propagate from csr -> state -> region).
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region.locked := state.l
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region.valid := True
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switch(csr.a) {
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is(TOR) {
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if (previous == null) region.start := 0
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else region.start := previous.region.end
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region.end := shifted
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}
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is(NA4) {
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region.start := shifted
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region.end := shifted + 4
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}
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is(NAPOT) {
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region.start := masked
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region.end := masked + ((mask + 1) << 2)
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}
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default {
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region.start := 0
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region.end := shifted
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region.valid := False
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}
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}
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}
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case class ProtectedMemoryTranslatorPort(bus : MemoryTranslatorBus)
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class PmpPlugin(regions : Int, granularity : Int, ioRange : UInt => Bool) extends Plugin[VexRiscv] with MemoryTranslator with Pmp {
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assert(regions % 4 == 0 & regions <= 16)
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assert(granularity >= 8)
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class PmpPlugin(regions : Int, ioRange : UInt => Bool) extends Plugin[VexRiscv] with MemoryTranslator {
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var setter : PmpSetter = null
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var dPort, iPort : ProtectedMemoryTranslatorPort = null
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val cutoff = log2Up(granularity) - 1
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// Each pmpcfg# CSR configures four regions.
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assert((regions % 4) == 0)
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val pmps = ArrayBuffer[PmpRegister]()
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val portsInfo = ArrayBuffer[ProtectedMemoryTranslatorPort]()
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override def newTranslationPort(priority : Int, args : Any): MemoryTranslatorBus = {
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val port = ProtectedMemoryTranslatorPort(MemoryTranslatorBus(new MemoryTranslatorBusParameter(0, 0)))
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priority match {
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case PRIORITY_INSTRUCTION => iPort = port
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case PRIORITY_DATA => dPort = port
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}
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portsInfo += port
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port.bus
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}
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override def setup(pipeline: VexRiscv): Unit = {
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setter = new PmpSetter(cutoff)
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}
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override def build(pipeline: VexRiscv): Unit = {
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import pipeline.config._
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import pipeline._
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@ -124,183 +193,76 @@ class PmpPlugin(regions : Int, granularity : Int, ioRange : UInt => Bool) extend
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val csrService = pipeline.service(classOf[CsrInterface])
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val privilegeService = pipeline.service(classOf[PrivilegeService])
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val state = pipeline plug new Area {
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val pmpaddr = Mem(UInt(xlen bits), regions)
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val pmpcfg = Vector.fill(regions)(Reg(Bits(8 bits)) init (0))
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val base, mask = Vector.fill(regions)(Reg(UInt(xlen - cutoff bits)))
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val core = pipeline plug new Area {
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// Instantiate pmpaddr0 ... pmpaddr# CSRs.
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for (i <- 0 until regions) {
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if (i == 0) {
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pmps += PmpRegister(null)
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} else {
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pmps += PmpRegister(pmps.last)
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}
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csrService.r(0x3b0 + i, pmps(i).state.addr)
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csrService.w(0x3b0 + i, pmps(i).csr.addr)
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}
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def machineMode : Bool = privilegeService.isMachine()
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execute plug new Area {
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import execute._
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val fsmPending = RegInit(False) clearWhen(!arbitration.isStuck)
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val fsmComplete = False
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val hazardFree = csrService.isHazardFree()
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val csrAddress = input(INSTRUCTION)(csrRange)
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val pmpNcfg = csrAddress(log2Up(regions) - 1 downto 0).asUInt
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val pmpcfgN = pmpNcfg(log2Up(regions) - 3 downto 0)
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val pmpcfgCsr = input(INSTRUCTION)(31 downto 24) === 0x3a
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val pmpaddrCsr = input(INSTRUCTION)(31 downto 24) === 0x3b
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val pmpNcfg_ = Reg(UInt(log2Up(regions) bits))
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val pmpcfgN_ = Reg(UInt(log2Up(regions) - 2 bits))
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val pmpcfgCsr_ = RegInit(False)
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val pmpaddrCsr_ = RegInit(False)
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val writeData_ = Reg(Bits(xlen bits))
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csrService.duringAnyRead {
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when (machineMode) {
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when (pmpcfgCsr) {
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csrService.allowCsr()
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csrService.readData() :=
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state.pmpcfg(pmpcfgN @@ U(3, 2 bits)) ##
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state.pmpcfg(pmpcfgN @@ U(2, 2 bits)) ##
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state.pmpcfg(pmpcfgN @@ U(1, 2 bits)) ##
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state.pmpcfg(pmpcfgN @@ U(0, 2 bits))
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}
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when (pmpaddrCsr) {
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csrService.allowCsr()
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csrService.readData() := state.pmpaddr(pmpNcfg).asBits
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}
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}
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}
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csrService.duringAnyWrite {
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when ((pmpcfgCsr | pmpaddrCsr) & machineMode) {
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csrService.allowCsr()
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arbitration.haltItself := !fsmComplete
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when (!fsmPending && hazardFree) {
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fsmPending := True
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writeData_ := csrService.writeData()
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pmpNcfg_ := pmpNcfg
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pmpcfgN_ := pmpcfgN
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pmpcfgCsr_ := pmpcfgCsr
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pmpaddrCsr_ := pmpaddrCsr
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}
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}
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}
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val fsm = new StateMachine {
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val fsmEnable = RegInit(False)
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val fsmCounter = Reg(UInt(log2Up(regions) bits)) init(0)
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val stateIdle : State = new State with EntryPoint {
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onEntry {
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fsmPending := False
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fsmEnable := False
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fsmComplete := True
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fsmCounter := 0
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}
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whenIsActive {
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when (fsmPending) {
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goto(stateWrite)
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}
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}
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}
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val stateWrite : State = new State {
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whenIsActive {
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when (pmpcfgCsr_) {
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val overwrite = writeData_.subdivideIn(8 bits)
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for (i <- 0 until 4) {
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when (~state.pmpcfg(pmpcfgN_ @@ U(i, 2 bits))(lBit)) {
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state.pmpcfg(pmpcfgN_ @@ U(i, 2 bits)).assignFromBits(overwrite(i))
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}
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}
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goto(stateCfg)
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}
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when (pmpaddrCsr_) {
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when (~state.pmpcfg(pmpNcfg_)(lBit)) {
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state.pmpaddr(pmpNcfg_) := writeData_.asUInt
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}
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goto(stateAddr)
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}
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}
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onExit (fsmEnable := True)
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}
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val stateCfg : State = new State {
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onEntry (fsmCounter := pmpcfgN_ @@ U(0, 2 bits))
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whenIsActive {
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fsmCounter := fsmCounter + 1
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when (fsmCounter(1 downto 0) === 3) {
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goto(stateIdle)
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}
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}
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}
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val stateAddr : State = new State {
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onEntry (fsmCounter := pmpNcfg_)
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whenIsActive (goto(stateIdle))
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}
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when (pmpaddrCsr_) {
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setter.io.addr := writeData_.asUInt
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} otherwise {
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setter.io.addr := state.pmpaddr(fsmCounter)
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}
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when (fsmEnable & ~state.pmpcfg(fsmCounter)(lBit)) {
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state.base(fsmCounter) := setter.io.base
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state.mask(fsmCounter) := setter.io.mask
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}
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}
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}
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pipeline plug new Area {
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def getHits(address : UInt) = {
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(0 until regions).map(i =>
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((address & state.mask(U(i, log2Up(regions) bits))) === state.base(U(i, log2Up(regions) bits))) &
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(state.pmpcfg(i)(lBit) | ~machineMode) & (state.pmpcfg(i)(aBits) === NAPOT)
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// Instantiate pmpcfg0 ... pmpcfg# CSRs.
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for (i <- 0 until (regions / 4)) {
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csrService.r(0x3a0 + i,
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31 -> pmps((i * 4) + 3).state.l, 23 -> pmps((i * 4) + 2).state.l,
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15 -> pmps((i * 4) + 1).state.l, 7 -> pmps((i * 4) ).state.l,
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27 -> pmps((i * 4) + 3).state.a, 26 -> pmps((i * 4) + 3).state.x,
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25 -> pmps((i * 4) + 3).state.w, 24 -> pmps((i * 4) + 3).state.r,
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19 -> pmps((i * 4) + 2).state.a, 18 -> pmps((i * 4) + 2).state.x,
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17 -> pmps((i * 4) + 2).state.w, 16 -> pmps((i * 4) + 2).state.r,
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11 -> pmps((i * 4) + 1).state.a, 10 -> pmps((i * 4) + 1).state.x,
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9 -> pmps((i * 4) + 1).state.w, 8 -> pmps((i * 4) + 1).state.r,
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3 -> pmps((i * 4) ).state.a, 2 -> pmps((i * 4) ).state.x,
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1 -> pmps((i * 4) ).state.w, 0 -> pmps((i * 4) ).state.r
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)
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csrService.w(0x3a0 + i,
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31 -> pmps((i * 4) + 3).csr.l, 23 -> pmps((i * 4) + 2).csr.l,
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15 -> pmps((i * 4) + 1).csr.l, 7 -> pmps((i * 4) ).csr.l,
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27 -> pmps((i * 4) + 3).csr.a, 26 -> pmps((i * 4) + 3).csr.x,
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25 -> pmps((i * 4) + 3).csr.w, 24 -> pmps((i * 4) + 3).csr.r,
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19 -> pmps((i * 4) + 2).csr.a, 18 -> pmps((i * 4) + 2).csr.x,
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17 -> pmps((i * 4) + 2).csr.w, 16 -> pmps((i * 4) + 2).csr.r,
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11 -> pmps((i * 4) + 1).csr.a, 10 -> pmps((i * 4) + 1).csr.x,
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9 -> pmps((i * 4) + 1).csr.w, 8 -> pmps((i * 4) + 1).csr.r,
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3 -> pmps((i * 4) ).csr.a, 2 -> pmps((i * 4) ).csr.x,
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1 -> pmps((i * 4) ).csr.w, 0 -> pmps((i * 4) ).csr.r
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)
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}
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def getPermission(hits : IndexedSeq[Bool], bit : Int) = {
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MuxOH(OHMasking.first(hits), state.pmpcfg.map(_(bit)))
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}
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// Connect memory ports to PMP logic.
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val ports = for ((port, portId) <- portsInfo.zipWithIndex) yield new Area {
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val dGuard = new Area {
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val address = dPort.bus.cmd(0).virtualAddress
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dPort.bus.rsp.physicalAddress := address
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dPort.bus.rsp.isIoAccess := ioRange(address)
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dPort.bus.rsp.isPaging := False
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dPort.bus.rsp.exception := False
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dPort.bus.rsp.refilling := False
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dPort.bus.rsp.allowExecute := False
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dPort.bus.busy := False
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val address = port.bus.cmd(0).virtualAddress
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port.bus.rsp.physicalAddress := address
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val hits = getHits(address(31 downto cutoff))
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// Only the first matching PMP region applies.
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val hits = pmps.map(pmp => pmp.region.valid &
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pmp.region.start <= address &
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pmp.region.end > address &
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(pmp.region.locked | ~privilegeService.isMachine()))
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when(~hits.orR) {
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||||
dPort.bus.rsp.allowRead := machineMode
|
||||
dPort.bus.rsp.allowWrite := machineMode
|
||||
// M-mode has full access by default, others have none.
|
||||
when(CountOne(hits) === 0) {
|
||||
port.bus.rsp.allowRead := privilegeService.isMachine()
|
||||
port.bus.rsp.allowWrite := privilegeService.isMachine()
|
||||
port.bus.rsp.allowExecute := privilegeService.isMachine()
|
||||
} otherwise {
|
||||
dPort.bus.rsp.allowRead := getPermission(hits, rBit)
|
||||
dPort.bus.rsp.allowWrite := getPermission(hits, wBit)
|
||||
}
|
||||
port.bus.rsp.allowRead := MuxOH(OHMasking.first(hits), pmps.map(_.state.r))
|
||||
port.bus.rsp.allowWrite := MuxOH(OHMasking.first(hits), pmps.map(_.state.w))
|
||||
port.bus.rsp.allowExecute := MuxOH(OHMasking.first(hits), pmps.map(_.state.x))
|
||||
}
|
||||
|
||||
val iGuard = new Area {
|
||||
val address = iPort.bus.cmd(0).virtualAddress
|
||||
iPort.bus.rsp.physicalAddress := address
|
||||
iPort.bus.rsp.isIoAccess := ioRange(address)
|
||||
iPort.bus.rsp.isPaging := False
|
||||
iPort.bus.rsp.exception := False
|
||||
iPort.bus.rsp.refilling := False
|
||||
iPort.bus.rsp.allowRead := False
|
||||
iPort.bus.rsp.allowWrite := False
|
||||
iPort.bus.busy := False
|
||||
port.bus.rsp.isIoAccess := ioRange(port.bus.rsp.physicalAddress)
|
||||
port.bus.rsp.isPaging := False
|
||||
port.bus.rsp.exception := False
|
||||
port.bus.rsp.refilling := False
|
||||
port.bus.busy := False
|
||||
|
||||
val hits = getHits(address(31 downto cutoff))
|
||||
|
||||
when(~hits.orR) {
|
||||
iPort.bus.rsp.allowExecute := machineMode
|
||||
} otherwise {
|
||||
iPort.bus.rsp.allowExecute := getPermission(hits, xBit)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,307 @@
|
|||
/*
|
||||
* Copyright (c) 2021 Samuel Lindemer <samuel.lindemer@ri.se>
|
||||
*
|
||||
* SPDX-License-Identifier: MIT
|
||||
*/
|
||||
|
||||
package vexriscv.plugin
|
||||
|
||||
import vexriscv.{VexRiscv, _}
|
||||
import vexriscv.plugin.MemoryTranslatorPort.{_}
|
||||
import spinal.core._
|
||||
import spinal.lib._
|
||||
import spinal.lib.fsm._
|
||||
|
||||
/* Each 32-bit pmpcfg# register contains four 8-bit configuration sections.
|
||||
* These section numbers contain flags which apply to regions defined by the
|
||||
* corresponding pmpaddr# register.
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | pmp3cfg | pmp2cfg | pmp1cfg | pmp0cfg | pmpcfg0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | pmp7cfg | pmp6cfg | pmp5cfg | pmp4cfg | pmpcfg2
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* 7 6 5 4 3 2 1 0
|
||||
* +-------+-------+-------+-------+-------+-------+-------+-------+
|
||||
* | L | 0 | A | X | W | R | pmp#cfg
|
||||
* +-------+-------+-------+-------+-------+-------+-------+-------+
|
||||
*
|
||||
* L: locks configuration until system reset (including M-mode)
|
||||
* 0: hardwired to zero
|
||||
* A: 0 = OFF (null region / disabled)
|
||||
* 1 = TOR (top of range)
|
||||
* 2 = NA4 (naturally aligned four-byte region)
|
||||
* 3 = NAPOT (naturally aligned power-of-two region, > 7 bytes)
|
||||
* X: execute
|
||||
* W: write
|
||||
* R: read
|
||||
*
|
||||
* TOR: Each 32-bit pmpaddr# register defines the upper bound of the pmp region
|
||||
* right-shifted by two bits. The lower bound of the region is the previous
|
||||
* pmpaddr# register. In the case of pmpaddr0, the lower bound is address 0x0.
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | address[33:2] | pmpaddr#
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* NAPOT: Each 32-bit pmpaddr# register defines the region address and the size
|
||||
* of the pmp region. The number of concurrent 1s begging at the LSB indicates
|
||||
* the size of the region as a power of two (e.g. 0x...0 = 8-byte, 0x...1 =
|
||||
* 16-byte, 0x...11 = 32-byte, etc.).
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | address[33:2] |0|1|1|1|1| pmpaddr#
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* NA4: This is essentially an edge case of NAPOT where the entire pmpaddr#
|
||||
* register defines a 4-byte wide region.
|
||||
*
|
||||
* N.B. THIS IMPLEMENTATION ONLY SUPPORTS NAPOT ADDRESSING. REGIONS ARE NOT
|
||||
* ORDERED BY PRIORITY. A PERMISSION IS GRANTED TO AN ACCESS IF ANY MATCHING
|
||||
* PMP REGION HAS THAT PERMISSION ENABLED.
|
||||
*/
|
||||
|
||||
trait Pmp {
|
||||
def OFF = 0
|
||||
def TOR = 1
|
||||
def NA4 = 2
|
||||
def NAPOT = 3
|
||||
|
||||
def xlen = 32
|
||||
def rBit = 0
|
||||
def wBit = 1
|
||||
def xBit = 2
|
||||
def aBits = 4 downto 3
|
||||
def lBit = 7
|
||||
}
|
||||
|
||||
class PmpSetter(cutoff : Int) extends Component with Pmp {
|
||||
val io = new Bundle {
|
||||
val addr = in UInt(xlen bits)
|
||||
val base, mask = out UInt(xlen - cutoff bits)
|
||||
}
|
||||
|
||||
val ones = io.addr & ~(io.addr + 1)
|
||||
io.base := io.addr(xlen - 3 downto cutoff - 2) ^ ones(xlen - 3 downto cutoff - 2)
|
||||
io.mask := ~(ones(xlen - 4 downto cutoff - 2) @@ U"1")
|
||||
}
|
||||
|
||||
case class ProtectedMemoryTranslatorPort(bus : MemoryTranslatorBus)
|
||||
|
||||
class PmpPluginNapot(regions : Int, granularity : Int, ioRange : UInt => Bool) extends Plugin[VexRiscv] with MemoryTranslator with Pmp {
|
||||
assert(regions % 4 == 0 & regions <= 16)
|
||||
assert(granularity >= 8)
|
||||
|
||||
var setter : PmpSetter = null
|
||||
var dPort, iPort : ProtectedMemoryTranslatorPort = null
|
||||
val cutoff = log2Up(granularity) - 1
|
||||
|
||||
override def newTranslationPort(priority : Int, args : Any): MemoryTranslatorBus = {
|
||||
val port = ProtectedMemoryTranslatorPort(MemoryTranslatorBus(new MemoryTranslatorBusParameter(0, 0)))
|
||||
priority match {
|
||||
case PRIORITY_INSTRUCTION => iPort = port
|
||||
case PRIORITY_DATA => dPort = port
|
||||
}
|
||||
port.bus
|
||||
}
|
||||
|
||||
override def setup(pipeline: VexRiscv): Unit = {
|
||||
setter = new PmpSetter(cutoff)
|
||||
}
|
||||
|
||||
override def build(pipeline: VexRiscv): Unit = {
|
||||
import pipeline.config._
|
||||
import pipeline._
|
||||
import Riscv._
|
||||
|
||||
val csrService = pipeline.service(classOf[CsrInterface])
|
||||
val privilegeService = pipeline.service(classOf[PrivilegeService])
|
||||
|
||||
val state = pipeline plug new Area {
|
||||
val pmpaddr = Mem(UInt(xlen bits), regions)
|
||||
val pmpcfg = Vector.fill(regions)(Reg(Bits(8 bits)) init (0))
|
||||
val base, mask = Vector.fill(regions)(Reg(UInt(xlen - cutoff bits)))
|
||||
}
|
||||
|
||||
def machineMode : Bool = privilegeService.isMachine()
|
||||
|
||||
execute plug new Area {
|
||||
import execute._
|
||||
|
||||
val fsmPending = RegInit(False) clearWhen(!arbitration.isStuck)
|
||||
val fsmComplete = False
|
||||
val hazardFree = csrService.isHazardFree()
|
||||
|
||||
val csrAddress = input(INSTRUCTION)(csrRange)
|
||||
val pmpNcfg = csrAddress(log2Up(regions) - 1 downto 0).asUInt
|
||||
val pmpcfgN = pmpNcfg(log2Up(regions) - 3 downto 0)
|
||||
val pmpcfgCsr = input(INSTRUCTION)(31 downto 24) === 0x3a
|
||||
val pmpaddrCsr = input(INSTRUCTION)(31 downto 24) === 0x3b
|
||||
|
||||
val pmpNcfg_ = Reg(UInt(log2Up(regions) bits))
|
||||
val pmpcfgN_ = Reg(UInt(log2Up(regions) - 2 bits))
|
||||
val pmpcfgCsr_ = RegInit(False)
|
||||
val pmpaddrCsr_ = RegInit(False)
|
||||
val writeData_ = Reg(Bits(xlen bits))
|
||||
|
||||
csrService.duringAnyRead {
|
||||
when (machineMode) {
|
||||
when (pmpcfgCsr) {
|
||||
csrService.allowCsr()
|
||||
csrService.readData() :=
|
||||
state.pmpcfg(pmpcfgN @@ U(3, 2 bits)) ##
|
||||
state.pmpcfg(pmpcfgN @@ U(2, 2 bits)) ##
|
||||
state.pmpcfg(pmpcfgN @@ U(1, 2 bits)) ##
|
||||
state.pmpcfg(pmpcfgN @@ U(0, 2 bits))
|
||||
}
|
||||
when (pmpaddrCsr) {
|
||||
csrService.allowCsr()
|
||||
csrService.readData() := state.pmpaddr(pmpNcfg).asBits
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
csrService.duringAnyWrite {
|
||||
when ((pmpcfgCsr | pmpaddrCsr) & machineMode) {
|
||||
csrService.allowCsr()
|
||||
arbitration.haltItself := !fsmComplete
|
||||
when (!fsmPending && hazardFree) {
|
||||
fsmPending := True
|
||||
writeData_ := csrService.writeData()
|
||||
pmpNcfg_ := pmpNcfg
|
||||
pmpcfgN_ := pmpcfgN
|
||||
pmpcfgCsr_ := pmpcfgCsr
|
||||
pmpaddrCsr_ := pmpaddrCsr
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
val fsm = new StateMachine {
|
||||
val fsmEnable = RegInit(False)
|
||||
val fsmCounter = Reg(UInt(log2Up(regions) bits)) init(0)
|
||||
|
||||
val stateIdle : State = new State with EntryPoint {
|
||||
onEntry {
|
||||
fsmPending := False
|
||||
fsmEnable := False
|
||||
fsmComplete := True
|
||||
fsmCounter := 0
|
||||
}
|
||||
whenIsActive {
|
||||
when (fsmPending) {
|
||||
goto(stateWrite)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
val stateWrite : State = new State {
|
||||
whenIsActive {
|
||||
when (pmpcfgCsr_) {
|
||||
val overwrite = writeData_.subdivideIn(8 bits)
|
||||
for (i <- 0 until 4) {
|
||||
when (~state.pmpcfg(pmpcfgN_ @@ U(i, 2 bits))(lBit)) {
|
||||
state.pmpcfg(pmpcfgN_ @@ U(i, 2 bits)).assignFromBits(overwrite(i))
|
||||
}
|
||||
}
|
||||
goto(stateCfg)
|
||||
}
|
||||
when (pmpaddrCsr_) {
|
||||
when (~state.pmpcfg(pmpNcfg_)(lBit)) {
|
||||
state.pmpaddr(pmpNcfg_) := writeData_.asUInt
|
||||
}
|
||||
goto(stateAddr)
|
||||
}
|
||||
}
|
||||
onExit (fsmEnable := True)
|
||||
}
|
||||
|
||||
val stateCfg : State = new State {
|
||||
onEntry (fsmCounter := pmpcfgN_ @@ U(0, 2 bits))
|
||||
whenIsActive {
|
||||
fsmCounter := fsmCounter + 1
|
||||
when (fsmCounter(1 downto 0) === 3) {
|
||||
goto(stateIdle)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
val stateAddr : State = new State {
|
||||
onEntry (fsmCounter := pmpNcfg_)
|
||||
whenIsActive (goto(stateIdle))
|
||||
}
|
||||
|
||||
when (pmpaddrCsr_) {
|
||||
setter.io.addr := writeData_.asUInt
|
||||
} otherwise {
|
||||
setter.io.addr := state.pmpaddr(fsmCounter)
|
||||
}
|
||||
|
||||
when (fsmEnable & ~state.pmpcfg(fsmCounter)(lBit)) {
|
||||
state.base(fsmCounter) := setter.io.base
|
||||
state.mask(fsmCounter) := setter.io.mask
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pipeline plug new Area {
|
||||
def getHits(address : UInt) = {
|
||||
(0 until regions).map(i =>
|
||||
((address & state.mask(U(i, log2Up(regions) bits))) === state.base(U(i, log2Up(regions) bits))) &
|
||||
(state.pmpcfg(i)(lBit) | ~machineMode) & (state.pmpcfg(i)(aBits) === NAPOT)
|
||||
)
|
||||
}
|
||||
|
||||
def getPermission(hits : IndexedSeq[Bool], bit : Int) = {
|
||||
MuxOH(OHMasking.first(hits), state.pmpcfg.map(_(bit)))
|
||||
}
|
||||
|
||||
val dGuard = new Area {
|
||||
val address = dPort.bus.cmd(0).virtualAddress
|
||||
dPort.bus.rsp.physicalAddress := address
|
||||
dPort.bus.rsp.isIoAccess := ioRange(address)
|
||||
dPort.bus.rsp.isPaging := False
|
||||
dPort.bus.rsp.exception := False
|
||||
dPort.bus.rsp.refilling := False
|
||||
dPort.bus.rsp.allowExecute := False
|
||||
dPort.bus.busy := False
|
||||
|
||||
val hits = getHits(address(31 downto cutoff))
|
||||
|
||||
when(~hits.orR) {
|
||||
dPort.bus.rsp.allowRead := machineMode
|
||||
dPort.bus.rsp.allowWrite := machineMode
|
||||
} otherwise {
|
||||
dPort.bus.rsp.allowRead := getPermission(hits, rBit)
|
||||
dPort.bus.rsp.allowWrite := getPermission(hits, wBit)
|
||||
}
|
||||
}
|
||||
|
||||
val iGuard = new Area {
|
||||
val address = iPort.bus.cmd(0).virtualAddress
|
||||
iPort.bus.rsp.physicalAddress := address
|
||||
iPort.bus.rsp.isIoAccess := ioRange(address)
|
||||
iPort.bus.rsp.isPaging := False
|
||||
iPort.bus.rsp.exception := False
|
||||
iPort.bus.rsp.refilling := False
|
||||
iPort.bus.rsp.allowRead := False
|
||||
iPort.bus.rsp.allowWrite := False
|
||||
iPort.bus.busy := False
|
||||
|
||||
val hits = getHits(address(31 downto cutoff))
|
||||
|
||||
when(~hits.orR) {
|
||||
iPort.bus.rsp.allowExecute := machineMode
|
||||
} otherwise {
|
||||
iPort.bus.rsp.allowExecute := getPermission(hits, xBit)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,269 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2020 Samuel Lindemer <samuel.lindemer@ri.se>
|
||||
*
|
||||
* SPDX-License-Identifier: MIT
|
||||
*/
|
||||
|
||||
package vexriscv.plugin
|
||||
|
||||
import vexriscv.{VexRiscv, _}
|
||||
import spinal.core._
|
||||
import spinal.lib._
|
||||
import scala.collection.mutable.ArrayBuffer
|
||||
|
||||
/* Each 32-bit pmpcfg# register contains four 8-bit configuration sections.
|
||||
* These section numbers contain flags which apply to regions defined by the
|
||||
* corresponding pmpaddr# register.
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | pmp3cfg | pmp2cfg | pmp1cfg | pmp0cfg | pmpcfg0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | pmp7cfg | pmp6cfg | pmp5cfg | pmp4cfg | pmpcfg2
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* 7 6 5 4 3 2 1 0
|
||||
* +-------+-------+-------+-------+-------+-------+-------+-------+
|
||||
* | L | 0 | A | X | W | R | pmp#cfg
|
||||
* +-------+-------+-------+-------+-------+-------+-------+-------+
|
||||
*
|
||||
* L: locks configuration until system reset (including M-mode)
|
||||
* 0: hardwired to zero
|
||||
* A: 0 = OFF (null region / disabled)
|
||||
* 1 = TOR (top of range)
|
||||
* 2 = NA4 (naturally aligned four-byte region)
|
||||
* 3 = NAPOT (naturally aligned power-of-two region, > 7 bytes)
|
||||
* X: execute
|
||||
* W: write
|
||||
* R: read
|
||||
*
|
||||
* TOR: Each 32-bit pmpaddr# register defines the upper bound of the pmp region
|
||||
* right-shifted by two bits. The lower bound of the region is the previous
|
||||
* pmpaddr# register. In the case of pmpaddr0, the lower bound is address 0x0.
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | address[33:2] | pmpaddr#
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* NAPOT: Each 32-bit pmpaddr# register defines the region address and the size
|
||||
* of the pmp region. The number of concurrent 1s begging at the LSB indicates
|
||||
* the size of the region as a power of two (e.g. 0x...0 = 8-byte, 0x...1 =
|
||||
* 16-byte, 0x...11 = 32-byte, etc.).
|
||||
*
|
||||
* 3 2 1
|
||||
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
* | address[33:2] |0|1|1|1|1| pmpaddr#
|
||||
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||||
*
|
||||
* NA4: This is essentially an edge case of NAPOT where the entire pmpaddr#
|
||||
* register defines a 4-byte wide region.
|
||||
*/
|
||||
|
||||
case class PmpRegister(previous : PmpRegister) extends Area {
|
||||
|
||||
def OFF = 0
|
||||
def TOR = 1
|
||||
def NA4 = 2
|
||||
def NAPOT = 3
|
||||
|
||||
val state = new Area {
|
||||
val r, w, x = Reg(Bool)
|
||||
val l = RegInit(False)
|
||||
val a = Reg(UInt(2 bits)) init(0)
|
||||
val addr = Reg(UInt(32 bits))
|
||||
}
|
||||
|
||||
// CSR writes connect to these signals rather than the internal state
|
||||
// registers. This makes locking and WARL possible.
|
||||
val csr = new Area {
|
||||
val r, w, x = Bool
|
||||
val l = Bool
|
||||
val a = UInt(2 bits)
|
||||
val addr = UInt(32 bits)
|
||||
}
|
||||
|
||||
// Last valid assignment wins; nothing happens if a user-initiated write did
|
||||
// not occur on this clock cycle.
|
||||
csr.r := state.r
|
||||
csr.w := state.w
|
||||
csr.x := state.x
|
||||
csr.l := state.l
|
||||
csr.a := state.a
|
||||
csr.addr := state.addr
|
||||
|
||||
// Computed PMP region bounds
|
||||
val region = new Area {
|
||||
val valid, locked = Bool
|
||||
|
||||
// The calculated start & end addresses can overflow xlen by 4 bit:
|
||||
//
|
||||
// - 2 bit, as the pmpaddrX registers are defined as to encode
|
||||
// [XLEN + 2 downto 2] addresses.
|
||||
//
|
||||
// - 2 bit, as for NAPOT the most significant 0 bit encodes the region
|
||||
// length, with this bit included in the range!
|
||||
//
|
||||
// This means that (for xlen == 32 bit)
|
||||
//
|
||||
// pmpcfg(X / 4)(X % 4) = NAPOT
|
||||
// pmpaddrX = 0xFFFFFFFF
|
||||
//
|
||||
// will expand to
|
||||
//
|
||||
// start (inclusive): 0x000000000 << 2
|
||||
// end (exclusive): 0x200000000 << 2
|
||||
//
|
||||
// hence requiring xlen + 2 + 2 bit to represent the exclusive end
|
||||
// address. This could be optimized by using a saturating add, or making the
|
||||
// end address exclusive.
|
||||
val start, end = UInt(36 bits)
|
||||
}
|
||||
|
||||
when(~state.l) {
|
||||
state.r := csr.r
|
||||
state.w := csr.w
|
||||
state.x := csr.x
|
||||
state.l := csr.l
|
||||
state.a := csr.a
|
||||
state.addr := csr.addr
|
||||
|
||||
if (csr.l == True & csr.a == TOR) {
|
||||
previous.state.l := True
|
||||
}
|
||||
}
|
||||
|
||||
// Extend state.addr to 36 bits, to avoid these computations overflowing (as
|
||||
// explained above):
|
||||
val extended_addr = (B"00" ## state.addr.asBits).asUInt
|
||||
val shifted = extended_addr << 2
|
||||
val mask = extended_addr ^ (extended_addr + 1)
|
||||
val masked = (extended_addr & ~mask) << 2
|
||||
|
||||
// PMP changes take effect two clock cycles after the initial CSR write (i.e.,
|
||||
// settings propagate from csr -> state -> region).
|
||||
region.locked := state.l
|
||||
region.valid := True
|
||||
|
||||
switch(csr.a) {
|
||||
is(TOR) {
|
||||
if (previous == null) region.start := 0
|
||||
else region.start := previous.region.end
|
||||
region.end := shifted
|
||||
}
|
||||
is(NA4) {
|
||||
region.start := shifted
|
||||
region.end := shifted + 4
|
||||
}
|
||||
is(NAPOT) {
|
||||
region.start := masked
|
||||
region.end := masked + ((mask + 1) << 2)
|
||||
}
|
||||
default {
|
||||
region.start := 0
|
||||
region.end := shifted
|
||||
region.valid := False
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
class PmpPluginOld(regions : Int, ioRange : UInt => Bool) extends Plugin[VexRiscv] with MemoryTranslator {
|
||||
|
||||
// Each pmpcfg# CSR configures four regions.
|
||||
assert((regions % 4) == 0)
|
||||
|
||||
val pmps = ArrayBuffer[PmpRegister]()
|
||||
val portsInfo = ArrayBuffer[ProtectedMemoryTranslatorPort]()
|
||||
|
||||
override def newTranslationPort(priority : Int, args : Any): MemoryTranslatorBus = {
|
||||
val port = ProtectedMemoryTranslatorPort(MemoryTranslatorBus(new MemoryTranslatorBusParameter(0, 0)))
|
||||
portsInfo += port
|
||||
port.bus
|
||||
}
|
||||
|
||||
override def build(pipeline: VexRiscv): Unit = {
|
||||
import pipeline.config._
|
||||
import pipeline._
|
||||
import Riscv._
|
||||
|
||||
val csrService = pipeline.service(classOf[CsrInterface])
|
||||
val privilegeService = pipeline.service(classOf[PrivilegeService])
|
||||
|
||||
val core = pipeline plug new Area {
|
||||
|
||||
// Instantiate pmpaddr0 ... pmpaddr# CSRs.
|
||||
for (i <- 0 until regions) {
|
||||
if (i == 0) {
|
||||
pmps += PmpRegister(null)
|
||||
} else {
|
||||
pmps += PmpRegister(pmps.last)
|
||||
}
|
||||
csrService.r(0x3b0 + i, pmps(i).state.addr)
|
||||
csrService.w(0x3b0 + i, pmps(i).csr.addr)
|
||||
}
|
||||
|
||||
// Instantiate pmpcfg0 ... pmpcfg# CSRs.
|
||||
for (i <- 0 until (regions / 4)) {
|
||||
csrService.r(0x3a0 + i,
|
||||
31 -> pmps((i * 4) + 3).state.l, 23 -> pmps((i * 4) + 2).state.l,
|
||||
15 -> pmps((i * 4) + 1).state.l, 7 -> pmps((i * 4) ).state.l,
|
||||
27 -> pmps((i * 4) + 3).state.a, 26 -> pmps((i * 4) + 3).state.x,
|
||||
25 -> pmps((i * 4) + 3).state.w, 24 -> pmps((i * 4) + 3).state.r,
|
||||
19 -> pmps((i * 4) + 2).state.a, 18 -> pmps((i * 4) + 2).state.x,
|
||||
17 -> pmps((i * 4) + 2).state.w, 16 -> pmps((i * 4) + 2).state.r,
|
||||
11 -> pmps((i * 4) + 1).state.a, 10 -> pmps((i * 4) + 1).state.x,
|
||||
9 -> pmps((i * 4) + 1).state.w, 8 -> pmps((i * 4) + 1).state.r,
|
||||
3 -> pmps((i * 4) ).state.a, 2 -> pmps((i * 4) ).state.x,
|
||||
1 -> pmps((i * 4) ).state.w, 0 -> pmps((i * 4) ).state.r
|
||||
)
|
||||
csrService.w(0x3a0 + i,
|
||||
31 -> pmps((i * 4) + 3).csr.l, 23 -> pmps((i * 4) + 2).csr.l,
|
||||
15 -> pmps((i * 4) + 1).csr.l, 7 -> pmps((i * 4) ).csr.l,
|
||||
27 -> pmps((i * 4) + 3).csr.a, 26 -> pmps((i * 4) + 3).csr.x,
|
||||
25 -> pmps((i * 4) + 3).csr.w, 24 -> pmps((i * 4) + 3).csr.r,
|
||||
19 -> pmps((i * 4) + 2).csr.a, 18 -> pmps((i * 4) + 2).csr.x,
|
||||
17 -> pmps((i * 4) + 2).csr.w, 16 -> pmps((i * 4) + 2).csr.r,
|
||||
11 -> pmps((i * 4) + 1).csr.a, 10 -> pmps((i * 4) + 1).csr.x,
|
||||
9 -> pmps((i * 4) + 1).csr.w, 8 -> pmps((i * 4) + 1).csr.r,
|
||||
3 -> pmps((i * 4) ).csr.a, 2 -> pmps((i * 4) ).csr.x,
|
||||
1 -> pmps((i * 4) ).csr.w, 0 -> pmps((i * 4) ).csr.r
|
||||
)
|
||||
}
|
||||
|
||||
// Connect memory ports to PMP logic.
|
||||
val ports = for ((port, portId) <- portsInfo.zipWithIndex) yield new Area {
|
||||
|
||||
val address = port.bus.cmd(0).virtualAddress
|
||||
port.bus.rsp.physicalAddress := address
|
||||
|
||||
// Only the first matching PMP region applies.
|
||||
val hits = pmps.map(pmp => pmp.region.valid &
|
||||
pmp.region.start <= address &
|
||||
pmp.region.end > address &
|
||||
(pmp.region.locked | ~privilegeService.isMachine()))
|
||||
|
||||
// M-mode has full access by default, others have none.
|
||||
when(CountOne(hits) === 0) {
|
||||
port.bus.rsp.allowRead := privilegeService.isMachine()
|
||||
port.bus.rsp.allowWrite := privilegeService.isMachine()
|
||||
port.bus.rsp.allowExecute := privilegeService.isMachine()
|
||||
} otherwise {
|
||||
port.bus.rsp.allowRead := MuxOH(OHMasking.first(hits), pmps.map(_.state.r))
|
||||
port.bus.rsp.allowWrite := MuxOH(OHMasking.first(hits), pmps.map(_.state.w))
|
||||
port.bus.rsp.allowExecute := MuxOH(OHMasking.first(hits), pmps.map(_.state.x))
|
||||
}
|
||||
|
||||
port.bus.rsp.isIoAccess := ioRange(port.bus.rsp.physicalAddress)
|
||||
port.bus.rsp.isPaging := False
|
||||
port.bus.rsp.exception := False
|
||||
port.bus.rsp.refilling := False
|
||||
port.bus.busy := False
|
||||
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -520,7 +520,7 @@ class MmuPmpDimension extends VexRiscvDimension("DBus") {
|
|||
override def testParam = "MMU=no PMP=yes"
|
||||
|
||||
override def applyOn(config: VexRiscvConfig): Unit = {
|
||||
config.plugins += new PmpPlugin(
|
||||
config.plugins += new PmpPluginNapot(
|
||||
regions = 16,
|
||||
granularity = 32,
|
||||
ioRange = _ (31 downto 28) === 0xF
|
||||
|
|
|
|||
Loading…
Reference in New Issue