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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* System hooks for Chrome EC */
#include "hooks.h"
#include "link_defs.h"
#include "timer.h"
#include "util.h"
struct hook_ptrs {
const struct hook_data *start;
const struct hook_data *end;
};
/*
* Hook data start and end pointers for each type of hook. Must be in same
* order as enum hook_type.
*/
static const struct hook_ptrs hook_list[] = {
{__hooks_init, __hooks_init_end},
{__hooks_freq_change, __hooks_freq_change_end},
{__hooks_sysjump, __hooks_sysjump_end},
{__hooks_chipset_pre_init, __hooks_chipset_pre_init_end},
{__hooks_chipset_startup, __hooks_chipset_startup_end},
{__hooks_chipset_resume, __hooks_chipset_resume_end},
{__hooks_chipset_suspend, __hooks_chipset_suspend_end},
{__hooks_chipset_shutdown, __hooks_chipset_shutdown_end},
{__hooks_ac_change, __hooks_ac_change_end},
{__hooks_lid_change, __hooks_lid_change_end},
{__hooks_tick, __hooks_tick_end},
};
void hook_notify(enum hook_type type)
{
const struct hook_data *start, *end, *p;
int count, called = 0;
int last_prio = HOOK_PRIO_FIRST - 1, prio;
start = hook_list[type].start;
end = hook_list[type].end;
count = ((uint32_t)end - (uint32_t)start) / sizeof(struct hook_data);
/* Call all the hooks in priority order */
while (called < count) {
/* Find the lowest remaining priority */
for (p = start, prio = HOOK_PRIO_LAST + 1; p < end; p++) {
if (p->priority < prio && p->priority > last_prio)
prio = p->priority;
}
last_prio = prio;
/* Call all the hooks with that priority */
for (p = start; p < end; p++) {
if (p->priority == prio) {
called++;
p->routine();
}
}
}
}
void hook_task(void)
{
while (1) {
uint64_t t = get_time().val;
hook_notify(HOOK_TICK);
/* Use up the rest of our hook tick interval */
t = get_time().val - t;
if (t < HOOK_TICK_INTERVAL)
usleep(HOOK_TICK_INTERVAL - t);
}
}
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