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| author | Anthony Gutierrez <atgutier@umich.edu> | 2012-07-27 16:08:04 -0400 |
|---|---|---|
| committer | Anthony Gutierrez <atgutier@umich.edu> | 2012-07-27 16:08:04 -0400 |
| commit | 2eb6b403c976c7909a065b70ef831f4a309455b3 (patch) | |
| tree | 5192c98afcfd97382862275edc452672b01d2308 /src/arch/arm | |
| parent | ae6ab7c03ca719b7ab000ee62538fc71dd0cf8df (diff) | |
| download | gem5-2eb6b403c976c7909a065b70ef831f4a309455b3.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.cc | 30 | ||||
| -rw-r--r-- | src/arch/arm/miscregs.hh | 10 |
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__ |