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authorAnthony Gutierrez <atgutier@umich.edu>2012-07-27 16:08:04 -0400
committerAnthony Gutierrez <atgutier@umich.edu>2012-07-27 16:08:04 -0400
commit2eb6b403c976c7909a065b70ef831f4a309455b3 (patch)
tree5192c98afcfd97382862275edc452672b01d2308 /src/arch/arm
parentae6ab7c03ca719b7ab000ee62538fc71dd0cf8df (diff)
downloadgem5-2eb6b403c976c7909a065b70ef831f4a309455b3.tar.xz
ARM: fix value of MISCREG_CTR returned by readMiscReg()
According to the A15 TRM the value of this register is as follows (assuming 16 word = 64 byte lines) [31:29] Format - b100 specifies v7 [28] RAZ - b0 [27:24] CWG log2(max writeback size #words) - 0x4 16 words [23:20] ERG log2(max reservation size #words) - 0x4 16 words [19:16] DminLine log2(smallest dcache line #words) - 0x4 16 words [15:14] L1Ip L1 index/tagging policy - b11 specifies PIPT [13:4] RAZ - b0000000000 [3:0] IminLine log2(smallest icache line #words) - 0x4 16 words
Diffstat (limited to 'src/arch/arm')
-rw-r--r--src/arch/arm/isa.cc30
-rw-r--r--src/arch/arm/miscregs.hh10
2 files changed, 38 insertions, 2 deletions
diff --git a/src/arch/arm/isa.cc b/src/arch/arm/isa.cc
index 2a5fbd2f0..b253574c7 100644
--- a/src/arch/arm/isa.cc
+++ b/src/arch/arm/isa.cc
@@ -222,7 +222,33 @@ ISA::readMiscReg(int misc_reg, ThreadContext *tc)
case MISCREG_ID_PFR1:
return 0x00001; // !Timer | !Virti | !M Profile | !TrustZone | ARMv4
case MISCREG_CTR:
- return 0x86468006; // V7, 64 byte cache line, load/exclusive is exact
+ {
+ //all caches have the same line size in gem5
+ //4 byte words in ARM
+ unsigned lineSizeWords =
+ tc->getCpuPtr()->getInstPort().peerBlockSize() / 4;
+ unsigned log2LineSizeWords = 0;
+
+ while (lineSizeWords >>= 1) {
+ ++log2LineSizeWords;
+ }
+
+ CTR ctr = 0;
+ //log2 of minimun i-cache line size (words)
+ ctr.iCacheLineSize = log2LineSizeWords;
+ //b11 - gem5 uses pipt
+ ctr.l1IndexPolicy = 0x3;
+ //log2 of minimum d-cache line size (words)
+ ctr.dCacheLineSize = log2LineSizeWords;
+ //log2 of max reservation size (words)
+ ctr.erg = log2LineSizeWords;
+ //log2 of max writeback size (words)
+ ctr.cwg = log2LineSizeWords;
+ //b100 - gem5 format is ARMv7
+ ctr.format = 0x4;
+
+ return ctr;
+ }
case MISCREG_ACTLR:
warn("Not doing anything for miscreg ACTLR\n");
break;
@@ -250,7 +276,7 @@ ISA::readMiscReg(int misc_reg, ThreadContext *tc)
/* For now just implement the version number.
* Return 0 as we don't support debug architecture yet.
*/
- return 0;
+ return 0;
case MISCREG_DBGDSCR_INT:
return 0;
}
diff --git a/src/arch/arm/miscregs.hh b/src/arch/arm/miscregs.hh
index 0969479ee..7af4ec605 100644
--- a/src/arch/arm/miscregs.hh
+++ b/src/arch/arm/miscregs.hh
@@ -529,6 +529,16 @@ namespace ArmISA
Bitfield<31> l2rstDISABLE_monitor;
EndBitUnion(L2CTLR)
+ BitUnion32(CTR)
+ Bitfield<3,0> iCacheLineSize;
+ Bitfield<13,4> raz_13_4;
+ Bitfield<15,14> l1IndexPolicy;
+ Bitfield<19,16> dCacheLineSize;
+ Bitfield<23,20> erg;
+ Bitfield<27,24> cwg;
+ Bitfield<28> raz_28;
+ Bitfield<31,29> format;
+ EndBitUnion(CTR)
}
#endif // __ARCH_ARM_MISCREGS_HH__