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adding cover points to check if each of pmp access is set

This commit is contained in:
Srivatsa Yogendra 2019-01-31 13:13:27 -08:00
parent e1b4f5ad37
commit de26108e13
1 changed files with 19 additions and 0 deletions
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19
src/main/scala/rocket/PMP.scala
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@ -161,6 +161,25 @@ class PMPChecker(lgMaxSize: Int)(implicit p: Parameters) extends CoreModule()(p)
val hit = pmp.hit(io.addr, io.size, lgMaxSize, prevPMP)
val ignore = default && !pmp.cfg.l
val aligned = pmp.aligned(io.addr, io.size, lgMaxSize, prevPMP)
cover(!default && pmp.cfg.a === 0x0, "The cfg access is set to no access", "Cover PMP access mode setting")
cover(!default && pmp.cfg.a === 0x1, "The cfg access is set to TOR access", "Cover PMP access mode setting")
cover(!default && pmp.cfg.a === 0x2, "The cfg access is set to NA4 access", "Cover PMP access mode setting")
cover(!default && pmp.cfg.a === 0x3, "The cfg access is set to NAPOT access", "Cover PMP access mode setting")
cover(!default && pmp.cfg.l === 0x1, "The cfg lock is set to high", "Cover PMP lock mode setting")
// Not including Write and no Read permission as the combination is reserved
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x0), "The permission is set to no access", "Cover PMP access permission setting")
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x1), "The permission is set to Read only access", "Cover PMP access permission setting")
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x3), "The permission is set to Read and Write only access", "Cover PMP access permission setting")
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x4), "The permission is set to Execution only access", "Cover PMP access permission setting")
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x5), "The permission is set to Read and Execution only access", "Cover PMP access permission setting")
cover(!default && (Cat(pmp.cfg.x, pmp.cfg.w, pmp.cfg.r) === 0x7), "The permission is set to Read, Write and Execution access", "Cover PMP access permission setting")
cover(!ignore && hit && aligned && pmp.cfg.a === 0x1, "The access matches TOR mode", "Cover PMP access")
cover(!ignore && hit && aligned && pmp.cfg.a === 0x2, "The access matches NA4 mode", "Cover PMP access")
cover(!ignore && hit && aligned && pmp.cfg.a === 0x3, "The access matches NAPOT mode", "Cover PMP access")
val cur = Wire(init = pmp)
cur.cfg.r := (aligned && pmp.cfg.r) || ignore
cur.cfg.w := (aligned && pmp.cfg.w) || ignore