| Message ID | 1471343113-10652-9-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Shannon, On 16/08/2016 06:25, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > Factor MPIDR computing codes out as a helper, so it could be shared > between DT and ACPI. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> Acked-by: Julien Grall <julien.grall@arm.com> Regards, > --- > tools/libxl/libxl_arm.c | 8 +------- > tools/libxl/libxl_arm.h | 11 +++++++++++ > 2 files changed, 12 insertions(+), 7 deletions(-) > > diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c > index 8c7fc09..fa0497c 100644 > --- a/tools/libxl/libxl_arm.c > +++ b/tools/libxl/libxl_arm.c > @@ -309,13 +309,7 @@ static int make_cpus_node(libxl__gc *gc, void *fdt, int nr_cpus, > for (i = 0; i < nr_cpus; i++) { > const char *name; > > - /* > - * According to ARM CPUs bindings, the reg field should match > - * the MPIDR's affinity bits. We will use AFF0 and AFF1 when > - * constructing the reg value of the guest at the moment, for it > - * is enough for the current max vcpu number. > - */ > - mpidr_aff = (i & 0x0f) | (((i >> 4) & 0xff) << 8); > + mpidr_aff = libxl__compute_mpdir(i); > name = GCSPRINTF("cpu@%"PRIx64, mpidr_aff); > > res = fdt_begin_node(fdt, name); > diff --git a/tools/libxl/libxl_arm.h b/tools/libxl/libxl_arm.h > index fe1c05f..5c8fbc6 100644 > --- a/tools/libxl/libxl_arm.h > +++ b/tools/libxl/libxl_arm.h > @@ -35,6 +35,17 @@ static inline int libxl__prepare_acpi(libxl__gc *gc, > } > #endif > > +static inline uint64_t libxl__compute_mpdir(unsigned int cpuid) > +{ > + /* > + * According to ARM CPUs bindings, the reg field should match > + * the MPIDR's affinity bits. We will use AFF0 and AFF1 when > + * constructing the reg value of the guest at the moment, for it > + * is enough for the current max vcpu number. > + */ > + return (cpuid & 0x0f) | (((cpuid >> 4) & 0xff) << 8); > +} > + > /* > * Local variables: > * mode: C >
diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c index 8c7fc09..fa0497c 100644 --- a/tools/libxl/libxl_arm.c +++ b/tools/libxl/libxl_arm.c @@ -309,13 +309,7 @@ static int make_cpus_node(libxl__gc *gc, void *fdt, int nr_cpus, for (i = 0; i < nr_cpus; i++) { const char *name; - /* - * According to ARM CPUs bindings, the reg field should match - * the MPIDR's affinity bits. We will use AFF0 and AFF1 when - * constructing the reg value of the guest at the moment, for it - * is enough for the current max vcpu number. - */ - mpidr_aff = (i & 0x0f) | (((i >> 4) & 0xff) << 8); + mpidr_aff = libxl__compute_mpdir(i); name = GCSPRINTF("cpu@%"PRIx64, mpidr_aff); res = fdt_begin_node(fdt, name); diff --git a/tools/libxl/libxl_arm.h b/tools/libxl/libxl_arm.h index fe1c05f..5c8fbc6 100644 --- a/tools/libxl/libxl_arm.h +++ b/tools/libxl/libxl_arm.h @@ -35,6 +35,17 @@ static inline int libxl__prepare_acpi(libxl__gc *gc, } #endif +static inline uint64_t libxl__compute_mpdir(unsigned int cpuid) +{ + /* + * According to ARM CPUs bindings, the reg field should match + * the MPIDR's affinity bits. We will use AFF0 and AFF1 when + * constructing the reg value of the guest at the moment, for it + * is enough for the current max vcpu number. + */ + return (cpuid & 0x0f) | (((cpuid >> 4) & 0xff) << 8); +} + /* * Local variables: * mode: C