On 8/21/18 3:28 PM, Peter Maydell wrote: > The GICv2's QEMU interface (sysbus MMIO regions, IRQs, > etc) is now quite complicated with the addition of the > virtualization extensions. Add a comment in the header > file which documents it. > > Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> > --- > I needed to write this out to figure out what I was > connecting to what in the a15mpcore object :-) > --- > include/hw/intc/arm_gic.h | 35 +++++++++++++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > > diff --git a/include/hw/intc/arm_gic.h b/include/hw/intc/arm_gic.h > index 42bb535fd45..989bc837606 100644 > --- a/include/hw/intc/arm_gic.h > +++ b/include/hw/intc/arm_gic.h > @@ -18,6 +18,41 @@ > * with this program; if not, see <http://www.gnu.org/licenses/>. > */ > > +/* > + * QEMU interface: > + * + QOM property "num-cpu": number of CPUs to support > + * + QOM property "num-irq": number of IRQs (including both SPIs and PPIs) > + * + QOM property "revision": GIC version (1 or 2), or 0 for the 11MPCore > GIC > + * + QOM property "has-security-extensions": set true if the GIC should > + * implement the security extensions > + * + QOM property "has-virtualization-extensions": set true if the GIC > should > + * implement the virtualization extensions > + * + unnamed GPIO inputs: (where P is number of PPIs, i.e. num-irq - 32) "where P is the number of SPIs" > + * [0..P-1] SPIs > + * [P..P+31] PPIs for CPU 0 > + * [P+32..P+63] PPIs for CPU 1 > + * ... > + * + sysbus IRQ 0 : IRQ > + * + sysbus IRQ 1 : FIQ > + * + sysbus IRQ 2 : VIRQ (exists even if virt extensions not present) > + * + sysbus IRQ 3 : VFIQ (exists even if virt extensions not present) > + * + sysbus IRQ 4 : maintenance IRQ for CPU i/f 0 (only if virt extns > present) > + * + sysbus IRQ 5 : maintenance IRQ for CPU i/f 1 (only if virt extns > present) I think it's more like
For a GIC supporting N CPUs: + sysbus IRQ 0: IRQ for CPU 0 + ... + sysbus IRQ N-1: IRQ for CPU N-1 + sysbus IRQ N: FIQ for CPU 0 + ... + sysbus IRQ 2*N-1: FIQ for CPU N-1 + sysbus IRQ 2*N: VIRQ for CPU 0 + ... + sysbus IRQ 3*N-1: VIRQ for CPU N-1 + sysbus IRQ 3*N: VFIQ for CPU 0 + ... + sysbus IRQ 4*N-1: VFIQ for CPU N-1 + sysbus IRQ 4*N: maintenance IRQ for CPU i/f 0 (only if virt extns present) + ... + sysbus IRQ 5*N-1: maintenance IRQ for CPU i/f N-1 (only if virt extns present) > + * ... > + * + sysbus MMIO regions: (in order; numbers will vary depending on > + * whether virtualization extensions are present and on number of cores) > + * - distributor registers (GICD*) > + * - CPU interface for the accessing core (GICC*) > + * - virtual interface control registers (GICH*) (only if virt extns > present) > + * - virtual CPU interface for the accessing core (GICV*) (only if virt) > + * - CPU 0 CPU interface registers > + * - CPU 1 CPU interface registers > + * ... > + * - CPU 0 VCPU interface registers (only if virt extns present) CPU 0 virtual interface (GICH*) > + * - CPU 1 VCPU interface registers (only if virt extns present) CPU 1 virtual interface (GICH*) > + * ...> + */ > + > #ifndef HW_ARM_GIC_H > #define HW_ARM_GIC_H > >
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