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Strange little kernel optimization to ease targeting the timer tick and to limit the number of loops in the tick function to the number of tasks added rather than always looping the max number.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18893 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-10-27 16:30:24 +00:00
parent e5d72ac5f7
commit a9e69d935c
8 changed files with 37 additions and 126 deletions
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72
firmware/kernel.c
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@ -54,7 +54,9 @@
volatile long current_tick SHAREDDATA_ATTR = 0;
#endif
void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
/* List of tick tasks - final element always NULL for termination */
void (*tick_funcs[MAX_NUM_TICK_TASKS+1])(void);
static int num_tick_funcs = 0;
extern struct core_entry cores[NUM_CORES];
@ -128,18 +130,8 @@ void tick_start(unsigned int interval_in_ms)
void IMIA0(void) __attribute__ ((interrupt_handler));
void IMIA0(void)
{
int i;
/* Run through the list of tick tasks */
for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
{
if(tick_funcs[i])
{
tick_funcs[i]();
}
}
current_tick++;
call_tick_tasks();
TSR0 &= ~0x01;
}
@ -178,18 +170,8 @@ void tick_start(unsigned int interval_in_ms)
void TIMER0(void) __attribute__ ((interrupt_handler));
void TIMER0(void)
{
int i;
/* Run through the list of tick tasks */
for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
{
if(tick_funcs[i])
{
tick_funcs[i]();
}
}
current_tick++;
call_tick_tasks();
TER0 = 0xff; /* Clear all events */
}
@ -199,27 +181,17 @@ void TIMER0(void)
#ifndef BOOTLOADER
void TIMER1(void)
{
int i;
/* Run through the list of tick tasks (using main core) */
TIMER1_VAL; /* Read value to ack IRQ */
/* Run through the list of tick tasks using main CPU core -
wake up the COP through its control interface to provide pulse */
for (i = 0;i < MAX_NUM_TICK_TASKS;i++)
{
if (tick_funcs[i])
{
tick_funcs[i]();
}
}
call_tick_tasks();
#if NUM_CORES > 1
/* Pulse the COP */
core_wake(COP);
#endif /* NUM_CORES */
current_tick++;
}
#endif
@ -243,16 +215,8 @@ void tick_start(unsigned int interval_in_ms)
void timer_handler(void)
{
int i;
/* Run through the list of tick tasks */
for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
{
if(tick_funcs[i])
tick_funcs[i]();
}
current_tick++;
call_tick_tasks();
TIMER0.clr = 0;
}
@ -274,19 +238,16 @@ void tick_start(unsigned int interval_in_ms)
int tick_add_task(void (*f)(void))
{
int i;
int oldlevel = disable_irq_save();
/* Add a task if there is room */
for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
if(num_tick_funcs < MAX_NUM_TICK_TASKS)
{
if(tick_funcs[i] == NULL)
{
tick_funcs[i] = f;
restore_irq(oldlevel);
return 0;
}
tick_funcs[num_tick_funcs++] = f;
restore_irq(oldlevel);
return 0;
}
restore_irq(oldlevel);
panicf("Error! tick_add_task(): out of tasks");
return -1;
@ -298,11 +259,16 @@ int tick_remove_task(void (*f)(void))
int oldlevel = disable_irq_save();
/* Remove a task if it is there */
for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
for(i = 0;i < num_tick_funcs;i++)
{
if(tick_funcs[i] == f)
{
tick_funcs[i] = NULL;
/* Compact function list - propagates NULL-terminator as well */
for(; i < num_tick_funcs; i++)
tick_funcs[i] = tick_funcs[i+1];
num_tick_funcs--;
restore_irq(oldlevel);
return 0;
}