Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

First attempt at iPod threading.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7852 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2005-11-13 23:47:38 +00:00
parent e3095ee3b8
commit 52e91de5d3
2 changed files with 29 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
firmware/kernel.c
View file

@ -67,10 +67,6 @@ void sleep(int ticks)
void yield(void)
{
#if CONFIG_CPU == PP5020
/* TODO: Threading not yet implemented */
return;
#endif
switch_thread();
wake_up_thread();
}

42
firmware/thread.c
View file

@ -42,12 +42,12 @@ struct regs
void *start; /* Thread start address, or NULL when started */
};
#elif CONFIG_CPU == PP5020
/* TODO: define struct regs */
struct regs
{
void *sp; /* Stack pointer (a15) */
void *start; /* Thread start address */
int started; /* 0 when not started */
unsigned int r[9]; /* Registers r4-r12 */
void *sp; /* Stack pointer (r13) */
unsigned int lr; /* r14 (lr) */
void *start; /* Thread start address, or NULL when started */
};
#elif CONFIG_CPU == TCC730
struct regs
@ -79,17 +79,35 @@ static inline void store_context(void* addr) __attribute__ ((always_inline));
static inline void load_context(const void* addr) __attribute__ ((always_inline));
#if CONFIG_CPU == PP5020
/* TODO: Implement store_context and load_context */
/*---------------------------------------------------------------------------
* Store non-volatile context.
*---------------------------------------------------------------------------
*/
static inline void store_context(void* addr)
{
(void)addr;
asm volatile(
"stmia %0, { r4-r14 }\n"
: : "r" (addr)
);
}
/*---------------------------------------------------------------------------
* Load non-volatile context.
*---------------------------------------------------------------------------
*/
static inline void load_context(const void* addr)
{
(void)addr;
asm volatile(
"ldmia %0, { r4-r14 } \n" /* load regs r4 to r14 from context */
"ldr r0, [%0, #44] \n" /* load start pointer */
"mov r1, #0 \n"
"cmp r0, r1 \n" /* check for NULL */
"beq .running \n" /* if it's NULL, we're already running */
"str r1, [%0, #44] \n"
"mov pc, r0 \n" /* not already running, so jump to start */
".running: \n"
: : "r" (addr) : "r0", "r1"
);
}
@ -312,7 +330,7 @@ int create_thread(void (*function)(void), void* stack, int stack_size,
thread_stack[num_threads] = stack;
thread_stack_size[num_threads] = stack_size;
regs = &thread_contexts[num_threads];
#if defined(CPU_COLDFIRE) || (CONFIG_CPU == SH7034)
#if defined(CPU_COLDFIRE) || (CONFIG_CPU == SH7034) || (CONFIG_CPU == PP5020)
/* Align stack to an even 32 bit boundary */
regs->sp = (void*)(((unsigned int)stack + stack_size) & ~3);
#elif CONFIG_CPU == TCC730
@ -360,12 +378,10 @@ void init_threads(void)
thread_name[0] = main_thread_name;
thread_stack[0] = stackbegin;
thread_stack_size[0] = (int)stackend - (int)stackbegin;
#if defined(CPU_COLDFIRE) || (CONFIG_CPU == SH7034)
#if defined(CPU_COLDFIRE) || (CONFIG_CPU == SH7034) || (CONFIG_CPU == PP5020)
thread_contexts[0].start = 0; /* thread 0 already running */
#elif CONFIG_CPU == TCC730
thread_contexts[0].started = 1;
#elif CONFIG_CPU == PP5020
thread_contexts[0].start = 0; /* thread 0 already running */
#endif
num_sleepers = 0;
}