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Possible thread stack implementation. 

Architecture provides a function for thread stack base, thread code uses it.
Build and boot tested on Falco with multitasking on and off.

Change-Id: I5016fab47f9954379acf7702ac7965b0a70c88ed
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66578
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
(cherry picked from commit 3c6afef30c1a0ad6fba0fb76acc792184d924247)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6513
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
This commit is contained in:
Ronald G. Minnich 2013-08-21 16:03:32 -07:00 committed by Isaac Christensen
parent 0ffa11bdbb
commit 34352d16a9
3 changed files with 16 additions and 2 deletions
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7
src/arch/x86/lib/thread.c
View File

@ -56,3 +56,10 @@ void arch_prepare_thread(struct thread *t,
t->stack_current = stack; t->stack_current = stack;
} }
void *arch_get_thread_stackbase(void)
{
/* defined in c_start.S */
extern u8 thread_stacks[];
return &thread_stacks[0];
}

5
src/include/thread.h
View File

@ -38,6 +38,11 @@ struct thread {
}; };
void threads_initialize(void); void threads_initialize(void);
/* Get the base of the thread stacks.
* Returns pointer to CONFIG_NUM_THREADS*CONFIG_STACK_SIZE contiguous bytes
* aligned to CONFIG_STACK_SIZE, or NULL.
*/
void *arch_get_thread_stackbase(void);
/* Run func(arrg) on a new thread. Return 0 on successful start of thread, < 0 /* Run func(arrg) on a new thread. Return 0 on successful start of thread, < 0
* when thread could not be started. Note that the thread will block the * when thread could not be started. Note that the thread will block the
* current state in the boot state machine until it is complete. */ * current state in the boot state machine until it is complete. */

6
src/lib/thread.c
View File

@ -28,7 +28,6 @@ static void idle_thread_init(void);
/* There needs to be at least one thread to run the ramstate state machine. */ /* There needs to be at least one thread to run the ramstate state machine. */
#define TOTAL_NUM_THREADS (CONFIG_NUM_THREADS + 1) #define TOTAL_NUM_THREADS (CONFIG_NUM_THREADS + 1)
extern char thread_stacks[CONFIG_NUM_THREADS*CONFIG_STACK_SIZE];
/* Storage space for the thread structs .*/ /* Storage space for the thread structs .*/
static struct thread all_threads[TOTAL_NUM_THREADS]; static struct thread all_threads[TOTAL_NUM_THREADS];
@ -259,8 +258,11 @@ void threads_initialize(void)
{ {
int i; int i;
struct thread *t; struct thread *t;
char *stack_top; u8 *stack_top;
struct cpu_info *ci; struct cpu_info *ci;
u8 *thread_stacks;
thread_stacks = arch_get_thread_stackbase();
/* Initialize the BSP thread first. The cpu_info structure is assumed /* Initialize the BSP thread first. The cpu_info structure is assumed
* to be just under the top of the stack. */ * to be just under the top of the stack. */