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/******************************************************************************
* keyhandler.c
*/
#include <asm/regs.h>
#include <xen/keyhandler.h>
#include <xen/reboot.h>
#include <xen/event.h>
#include <xen/console.h>
#include <xen/serial.h>
#include <xen/sched.h>
#include <xen/softirq.h>
#include <xen/domain.h>
#include <asm/debugger.h>
#define KEY_MAX 256
#define STR_MAX 64
static struct {
union {
keyhandler_t *handler;
irq_keyhandler_t *irq_handler;
} u;
unsigned int flags;
char desc[STR_MAX];
} key_table[KEY_MAX];
#define KEYHANDLER_IRQ_CALLBACK 0x1
static unsigned char keypress_key;
static void keypress_softirq(void)
{
keyhandler_t *h;
unsigned char key = keypress_key;
if ( (h = key_table[key].u.handler) != NULL )
(*h)(key);
}
void handle_keypress(unsigned char key, struct cpu_user_regs *regs)
{
irq_keyhandler_t *h;
if ( key_table[key].flags & KEYHANDLER_IRQ_CALLBACK )
{
if ( (h = key_table[key].u.irq_handler) != NULL )
(*h)(key, regs);
}
else
{
keypress_key = key;
raise_softirq(KEYPRESS_SOFTIRQ);
}
}
void register_keyhandler(
unsigned char key, keyhandler_t *handler, char *desc)
{
ASSERT(key_table[key].u.handler == NULL);
key_table[key].u.handler = handler;
key_table[key].flags = 0;
strncpy(key_table[key].desc, desc, STR_MAX);
key_table[key].desc[STR_MAX-1] = '\0';
}
void register_irq_keyhandler(
unsigned char key, irq_keyhandler_t *handler, char *desc)
{
ASSERT(key_table[key].u.irq_handler == NULL);
key_table[key].u.irq_handler = handler;
key_table[key].flags = KEYHANDLER_IRQ_CALLBACK;
strncpy(key_table[key].desc, desc, STR_MAX);
key_table[key].desc[STR_MAX-1] = '\0';
}
static void show_handlers(unsigned char key)
{
int i;
printk("'%c' pressed -> showing installed handlers\n", key);
for ( i = 0; i < KEY_MAX; i++ )
if ( key_table[i].u.handler != NULL )
printk(" key '%c' (ascii '%02x') => %s\n",
(i<33 || i>126)?(' '):(i),i,
key_table[i].desc);
}
static void dump_registers(unsigned char key, struct cpu_user_regs *regs)
{
printk("'%c' pressed -> dumping registers\n", key);
show_registers(regs);
}
static void halt_machine(unsigned char key, struct cpu_user_regs *regs)
{
printk("'%c' pressed -> rebooting machine\n", key);
machine_restart(NULL);
}
static void do_task_queues(unsigned char key)
{
struct domain *d;
struct vcpu *v;
s_time_t now = NOW();
printk("'%c' pressed -> dumping task queues (now=0x%X:%08X)\n", key,
(u32)(now>>32), (u32)now);
read_lock(&domlist_lock);
for_each_domain ( d )
{
printk("Xen: DOM %u, flags=%lx refcnt=%d nr_pages=%d "
"xenheap_pages=%d\n", d->domain_id, d->domain_flags,
atomic_read(&d->refcnt), d->tot_pages, d->xenheap_pages);
dump_pageframe_info(d);
for_each_vcpu ( d, v ) {
printk("Guest: %p CPU %d [has=%c] flags=%lx "
"upcall_pend = %02x, upcall_mask = %02x\n", v,
v->processor,
test_bit(_VCPUF_running, &v->vcpu_flags) ? 'T':'F',
v->vcpu_flags,
v->vcpu_info->evtchn_upcall_pending,
v->vcpu_info->evtchn_upcall_mask);
printk("Notifying guest... %d/%d\n", d->domain_id, v->vcpu_id);
printk("port %d/%d stat %d %d %d\n",
VIRQ_DEBUG, v->virq_to_evtchn[VIRQ_DEBUG],
test_bit(v->virq_to_evtchn[VIRQ_DEBUG],
&d->shared_info->evtchn_pending[0]),
test_bit(v->virq_to_evtchn[VIRQ_DEBUG],
&d->shared_info->evtchn_mask[0]),
test_bit(v->virq_to_evtchn[VIRQ_DEBUG]>>5,
&v->vcpu_info->evtchn_pending_sel));
send_guest_virq(v, VIRQ_DEBUG);
}
}
read_unlock(&domlist_lock);
}
extern void dump_runq(unsigned char key);
extern void print_sched_histo(unsigned char key);
extern void reset_sched_histo(unsigned char key);
#ifndef NDEBUG
extern void audit_domains_key(unsigned char key);
#endif
#ifdef PERF_COUNTERS
extern void perfc_printall(unsigned char key);
extern void perfc_reset(unsigned char key);
#endif
void do_debug_key(unsigned char key, struct cpu_user_regs *regs)
{
(void)debugger_trap_fatal(0xf001, regs);
nop(); /* Prevent the compiler doing tail call
optimisation, as that confuses xendbg a
bit. */
}
#ifndef NDEBUG
void debugtrace_key(unsigned char key)
{
debugtrace_send_to_console = !debugtrace_send_to_console;
debugtrace_dump();
printk("debugtrace_printk now writing to %s.\n",
debugtrace_send_to_console ? "console" : "buffer");
}
#endif
void initialize_keytable(void)
{
open_softirq(KEYPRESS_SOFTIRQ, keypress_softirq);
register_irq_keyhandler(
'd', dump_registers, "dump registers");
register_keyhandler(
'h', show_handlers, "show this message");
register_keyhandler(
'l', print_sched_histo, "print sched latency histogram");
register_keyhandler(
'L', reset_sched_histo, "reset sched latency histogram");
register_keyhandler(
'q', do_task_queues, "dump task queues + guest state");
register_keyhandler(
'r', dump_runq, "dump run queues");
register_irq_keyhandler(
'R', halt_machine, "reboot machine");
#ifndef NDEBUG
register_keyhandler(
'o', audit_domains_key, "audit domains >0 EXPERIMENTAL");
register_keyhandler(
'T', debugtrace_key, "toggle debugtrace to console/buffer");
#endif
#ifdef PERF_COUNTERS
register_keyhandler(
'p', perfc_printall, "print performance counters");
register_keyhandler(
'P', perfc_reset, "reset performance counters");
#endif
register_irq_keyhandler('%', do_debug_key, "Trap to xendbg");
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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