erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

BACKPORT: coreboot: add thread cooperative multitasking

Browse source 
The cooperative multitasking support allows the boot state machine
to be ran cooperatively with other threads of work. The main thread
still continues to run the boot state machine
(src/lib/hardwaremain.c).  All callbacks from the state machine are
still ran synchronously from within the main thread's context.
Without any other code added the only change to the boot sequence
when cooperative multitasking is enabled is the queueing of an idlle
thread. The idle thread is responsible for ensuring progress is made
by calling timer callbacks.

The main thread can yield to any other threads in the system. That
means that anyone that spins up a thread must ensure no shared
resources are used from 2 or more execution contexts. The support
is originally intentioned to allow for long work itesm with busy
loops to occur in parallel during a boot.

Note that the intention on when to yield a thread will be on
calls to udelay().

BUG=None
BRANCH=None
TEST=Built.

Change-Id: I980a6daf8ea3f0475124329253ace2695fc39aa7
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/51162
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
This commit is contained in:
Aaron Durbin 2013-05-06 12:20:52 -05:00 • committed by ChromeBot
commit c451834963
7 changed files with 489 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/arch/armv7/include/arch/cpu.h
View file

@ -30,9 +30,14 @@ struct cpu_driver {
struct cpu_device_id *id_table;
};
struct thread;
struct cpu_info {
device_t cpu;
unsigned long index;
#if CONFIG_COOP_MULTITASKING
struct thread *thread;
#endif
};
struct cpuinfo_arm {

5
src/arch/x86/include/arch/cpu.h
View file

@ -159,9 +159,14 @@ struct cpu_driver {
struct cpu_driver *find_cpu_driver(struct device *cpu);
struct thread;
struct cpu_info {
device_t cpu;
unsigned int index;
#if CONFIG_COOP_MULTITASKING
struct thread *thread;
#endif
};
static inline struct cpu_info *cpu_info(void)