On 8 January 2013 17:38, Peter Maydell <peter.mayd...@linaro.org> wrote:
> On 8 January 2013 11:05, Anup Patel <anup.pa...@linaro.org> wrote: > > diff --git a/configure b/configure > > index fe18ed2..0bfb8bb 100755 > > --- a/configure > > +++ b/configure > > @@ -366,6 +366,8 @@ elif check_define __s390__ ; then > > fi > > elif check_define __arm__ ; then > > cpu="arm" > > +elif check_define __aarch64__ ; then > > + cpu="arm64" > > This should be "aarch64"... > > > elif check_define __hppa__ ; then > > cpu="hppa" > > else > > @@ -388,6 +390,9 @@ case "$cpu" in > > armv*b|armv*l|arm) > > cpu="arm" > > ;; > > + arm64|aarch64) > > + cpu="arm64" > > + ;; > > ...and this should just be > aarch64) > cpu="aarch64" > ;; > > Here's the rationale for that naming... > > So, to start off with, the official ARM terminology goes: > * ARMv8 is the new version of the architecture, covering both > 32 and 64 bit systems. (v7 is the most recent public arch > version and is 32 bit only.) There may well be a v9 in future. > * AArch64 is the 64 bit operating mode of a 64-bit aware v8 > core. (AArch32 is the corresponding 32 bit operating mode.) > The core can transition between these at exception boundaries. > * A64 is the instruction set visible in AArch64. A32 and T32 > are the 'classic' ARM and Thumb(2) instruction sets visible in > AArch32. NB that v8 includes some new stuff even in A32/T32 > (eg crypto extensions, some extensions to Neon, etc). > * arm64 is what the kernel port is called, since Linus doesn't > much like any of the above :-) Note that 'uname -m' still > says "aarch64", and the gcc triplet uses "aarch64". Only > kernel devs looking at source filenames see 'arm64'. > > So, QEMU names: > For the target architecture name (ie what comes out in the > qemu-foo and qemu-system-foo binary names) we generally use > the same name that 'uname -m' produces on those machines. In > this case that would be "aarch64", hence my suggested changes. > Agree with your suggestion. I will update the patch accordingly. > > The translator sources (as and when we implement a > TCG QEMU target for this) should live under the existing target-arm. > We will probably want to put the A64 decoder in its own file, > ie target-arm/translate-a64.c. > > [Big-endian would be aarch64_be, but let's not go there.] > > > Also, I suspect this isn't the only thing that will be required. > Presumably for an aarch64 build of QEMU we want to use > the 64 bit kernel KVM headers, which means we need to import > them. Since neither ARM 32 or 64 bit KVM has landed upstream > yet those parts are definitely not going to be ready for upstream > qemu just yet. Similarly the configure check for whether we can > set CONFIG_KVM needs to accept "target cpu is arm and > host cpu is aarch64", otherwise we won't enable KVM at all. > Yes. This patch only tries to make sure that the configure step falls through and at-least QEMU cross-compilation starts. (assuming we have provided the QEMU dependencies such as zlib, glib-2.0, etc.) > > -- PMM > --Anup
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