Giacomo Travaglini has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/50667 )
Change subject: arch-arm: SCTLR.WXN not used in S2AP
......................................................................
arch-arm: SCTLR.WXN not used in S2AP
Change-Id: I141f7088fce0e7eed01491920f84774394143b4a
Signed-off-by: Giacomo Travaglini <[email protected]>
---
M src/arch/arm/mmu.cc
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/src/arch/arm/mmu.cc b/src/arch/arm/mmu.cc
index 4cd1a67..96d0bc4 100644
--- a/src/arch/arm/mmu.cc
+++ b/src/arch/arm/mmu.cc
@@ -547,11 +547,10 @@
// In stage 2 we use the hypervisor access permission bits.
// The following permissions are described in ARM DDI 0487A.f
// D4-1802
- uint8_t hap = te->hap & 0b11;
bool grant = false;
- bool grant_read = hap & 0b1;
+ bool grant_read = te->hap & 0b01;
+ bool grant_write = te->hap & 0b10;
- bool wxn = state.sctlr.wxn;
uint8_t xn = te->xn;
uint8_t pxn = te->pxn;
@@ -560,19 +559,20 @@
xn = true;
}
- DPRINTF(TLBVerbose, "Checking S2 permissions: hap:%d, xn:%d, pxn:%d,
r:%d, "
- "w:%d, x:%d, wxn: %d\n", hap, xn,
- pxn, r, w, x, wxn);
+ DPRINTF(TLBVerbose,
+ "Checking S2 permissions: hap:%d, xn:%d, pxn:%d, r:%d, "
+ "w:%d, x:%d\n", te->hap, xn, pxn, r, w, x);
if (x) {
- // sctlr.wxn overrides the xn bit
- grant = !wxn && !xn;
+ grant = grant_read && !xn;
} else if (req->isAtomic()) {
- grant = hap;
+ grant = grant_read || grant_write;
} else if (w) {
- grant = hap & 0b10;
- } else { // is_read
+ grant = grant_write;
+ } else if (r) {
grant = grant_read;
+ } else {
+ panic("Invalid Operation\n");
}
return std::make_pair(grant, grant_read);
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I141f7088fce0e7eed01491920f84774394143b4a
Gerrit-Change-Number: 50667
Gerrit-PatchSet: 1
Gerrit-Owner: Giacomo Travaglini <[email protected]>
Gerrit-MessageType: newchange
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