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#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/softirq.h>
#include <xen/wait.h>
#include <xen/errno.h>
#include <asm/current.h>
#include <asm/regs.h>
#include <asm/p2m.h>
#include <asm/irq.h>
#include "gic.h"
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
static void continue_idle_domain(struct vcpu *v)
{
reset_stack_and_jump(idle_loop);
}
static void continue_nonidle_domain(struct vcpu *v)
{
/* check_wakeup_from_wait(); */
reset_stack_and_jump(return_from_trap);
}
void idle_loop(void)
{
for ( ; ; )
{
/* TODO
if ( cpu_is_offline(smp_processor_id()) )
play_dead();
(*pm_idle)();
BUG();
*/
do_tasklet();
do_softirq();
}
}
static void ctxt_switch_from(struct vcpu *p)
{
}
static void ctxt_switch_to(struct vcpu *n)
{
p2m_load_VTTBR(n->domain);
}
static void __context_switch(void)
{
struct cpu_user_regs *stack_regs = guest_cpu_user_regs();
unsigned int cpu = smp_processor_id();
struct vcpu *p = per_cpu(curr_vcpu, cpu);
struct vcpu *n = current;
ASSERT(p != n);
ASSERT(cpumask_empty(n->vcpu_dirty_cpumask));
if ( !is_idle_vcpu(p) )
{
memcpy(&p->arch.user_regs, stack_regs, CTXT_SWITCH_STACK_BYTES);
ctxt_switch_from(p);
}
if ( !is_idle_vcpu(n) )
{
memcpy(stack_regs, &n->arch.user_regs, CTXT_SWITCH_STACK_BYTES);
ctxt_switch_to(n);
}
per_cpu(curr_vcpu, cpu) = n;
}
static void schedule_tail(struct vcpu *v)
{
if ( is_idle_vcpu(v) )
continue_idle_domain(v);
else
continue_nonidle_domain(v);
}
void context_switch(struct vcpu *prev, struct vcpu *next)
{
unsigned int cpu = smp_processor_id();
ASSERT(local_irq_is_enabled());
printk("context switch %d:%d%s -> %d:%d%s\n",
prev->domain->domain_id, prev->vcpu_id, is_idle_vcpu(prev) ? " (idle)" : "",
next->domain->domain_id, next->vcpu_id, is_idle_vcpu(next) ? " (idle)" : "");
/* TODO
if (prev != next)
update_runstate_area(prev);
*/
local_irq_disable();
set_current(next);
if ( (per_cpu(curr_vcpu, cpu) == next) ||
(is_idle_vcpu(next) && cpu_online(cpu)) )
{
local_irq_enable();
}
else
{
__context_switch();
/* Re-enable interrupts before restoring state which may fault. */
local_irq_enable();
}
context_saved(prev);
/* TODO
if (prev != next)
update_runstate_area(next);
*/
schedule_tail(next);
BUG();
}
void continue_running(struct vcpu *same)
{
schedule_tail(same);
BUG();
}
int __sync_local_execstate(void)
{
unsigned long flags;
int switch_required;
local_irq_save(flags);
switch_required = (this_cpu(curr_vcpu) != current);
if ( switch_required )
{
ASSERT(current == idle_vcpu[smp_processor_id()]);
__context_switch();
}
local_irq_restore(flags);
return switch_required;
}
void sync_local_execstate(void)
{
(void)__sync_local_execstate();
}
void startup_cpu_idle_loop(void)
{
struct vcpu *v = current;
ASSERT(is_idle_vcpu(v));
/* TODO
cpumask_set_cpu(v->processor, v->domain->domain_dirty_cpumask);
cpumask_set_cpu(v->processor, v->vcpu_dirty_cpumask);
*/
reset_stack_and_jump(idle_loop);
}
struct domain *alloc_domain_struct(void)
{
struct domain *d;
BUILD_BUG_ON(sizeof(*d) > PAGE_SIZE);
d = alloc_xenheap_pages(0, 0);
if ( d != NULL )
clear_page(d);
return d;
}
void free_domain_struct(struct domain *d)
{
free_xenheap_page(d);
}
void dump_pageframe_info(struct domain *d)
{
}
struct vcpu *alloc_vcpu_struct(void)
{
struct vcpu *v;
BUILD_BUG_ON(sizeof(*v) > PAGE_SIZE);
v = alloc_xenheap_pages(0, 0);
if ( v != NULL )
clear_page(v);
return v;
}
void free_vcpu_struct(struct vcpu *v)
{
free_xenheap_page(v);
}
int vcpu_initialise(struct vcpu *v)
{
int rc = 0;
return rc;
}
void vcpu_destroy(struct vcpu *v)
{
}
int arch_domain_create(struct domain *d, unsigned int domcr_flags)
{
int rc;
d->max_vcpus = 8;
rc = 0;
fail:
return rc;
}
void arch_domain_destroy(struct domain *d)
{
/* p2m_destroy */
/* domain_vgic_destroy */
}
void arch_dump_domain_info(struct domain *d)
{
}
void arch_dump_vcpu_info(struct vcpu *v)
{
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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