On 12 December 2013 02:28, Christoffer Dall <christoffer.d...@linaro.org> wrote: > diff --git a/Documentation/virtual/kvm/api.txt > b/Documentation/virtual/kvm/api.txt > index a30035d..9565e6a 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -1889,9 +1889,12 @@ value in the kvm_regs structure seen as a 32bit array. > arm64 CCSIDR registers are demultiplexed by CSSELR value: > 0x6020 0000 0011 00 <csselr:8> > > -arm64 system registers have the following id bit patterns: > +arm64 64-bit system registers have the following id bit patterns: > 0x6030 0000 0013 <op0:2> <op1:3> <crn:4> <crm:4> <op2:3> > > +arm64 32-bit system registers have the following id bit patterns: > + 0x6020 0000 0013 <op0:2> <op1:3> <crn:4> <crm:4> <op2:3>
What does it mean to say that a system register for AArch64 is "32 bits" given that MRS/MSR always operate on a 64 bit register? We have the distinction in AArch32 because the instructions (and whether the input/output is in one register or a register pair) are different, but I can't see the need for AArch64. (The code I've just written for QEMU to handle sysregs says "they're all 64 bit"...) thanks -- PMM -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
