riscv/rocket-chip
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Add partial Sv48/Sv57 support

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Right now, we don't support Sv39 and Sv48 at the same time, which needs
to change.
This commit is contained in:
Andrew Waterman 2016-03-30 11:01:53 -07:00
parent e652821962
commit 8ad8e8a691
1 changed files with 2 additions and 1 deletions
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rocket/src/main/scala/csr.scala
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@ -440,7 +440,8 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
} }
if (usingVM) { if (usingVM) {
val vm_on = if (xLen == 32) 8 else 9 require(if (xLen == 32) pgLevels == 2 else pgLevels > 2 && pgLevels < 6)
val vm_on = 6 + pgLevels // TODO Sv48 support should imply Sv39 support
when (new_mstatus.vm === 0) { reg_mstatus.vm := 0 } when (new_mstatus.vm === 0) { reg_mstatus.vm := 0 }
when (new_mstatus.vm === vm_on) { reg_mstatus.vm := vm_on } when (new_mstatus.vm === vm_on) { reg_mstatus.vm := vm_on }
} }