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ia64/pv_ops/xen: implement xen pv_iosapic_ops. 

implement xen pv_iosapic_ops for xen paravirtualized
iosapic.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2008-10-17 11:18:05 +09:00 committed by Tony Luck
parent 16583bc0b4
commit bcdd48739d
1 changed files with 52 additions and 0 deletions
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52
arch/ia64/xen/xen_pv_ops.c
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@ -291,6 +291,57 @@ const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
.leave_kernel = (unsigned long)&xen_leave_kernel,
};
/***************************************************************************
* pv_iosapic_ops
* iosapic read/write hooks.
*/
static void
xen_pcat_compat_init(void)
{
/* nothing */
}
static struct irq_chip*
xen_iosapic_get_irq_chip(unsigned long trigger)
{
return NULL;
}
static unsigned int
xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
{
struct physdev_apic apic_op;
int ret;
apic_op.apic_physbase = (unsigned long)iosapic -
__IA64_UNCACHED_OFFSET;
apic_op.reg = reg;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
if (ret)
return ret;
return apic_op.value;
}
static void
xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
{
struct physdev_apic apic_op;
apic_op.apic_physbase = (unsigned long)iosapic -
__IA64_UNCACHED_OFFSET;
apic_op.reg = reg;
apic_op.value = val;
HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
}
static const struct pv_iosapic_ops xen_iosapic_ops __initdata = {
.pcat_compat_init = xen_pcat_compat_init,
.__get_irq_chip = xen_iosapic_get_irq_chip,
.__read = xen_iosapic_read,
.__write = xen_iosapic_write,
};
/***************************************************************************
* pv_ops initialization
*/
@ -302,6 +353,7 @@ xen_setup_pv_ops(void)
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_cpu_ops = xen_cpu_ops;
pv_iosapic_ops = xen_iosapic_ops;
paravirt_cpu_asm_init(&xen_cpu_asm_switch);
}