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BACKPORT: x86: add cache-as-ram migration option

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There are some boards that do a significant amount of
work after cache-as-ram is torn down but before ramstage
is loaded. For example, using vboot to verify the ramstage
is one such operation. However, there are pieces of code
that are executed that reference global variables that
are linked in the cache-as-ram region. If those variables
are referenced after cache-as-ram is torn down then the
values observed will most likely be incorrect.

Therefore provide a Kconfig option to select cache-as-ram
migration to memory using cbmem. This option is named
CAR_MIGRATION. When enabled, the address of cache-as-ram
variables may be obtained dynamically. Additionally,
when cache-as-ram migration occurs the cache-as-ram
data region for global variables is copied into cbmem.
There are also automatic callbacks for other modules
to perform their own migration, if necessary.

BUG=chrome-os-partner:19342
BRANCH=none
TEST=Built and booted. Noted that CAR values are not read incorrectly.

Change-Id: Ie0104a6e24cc6430a575ee3691671900c36db0d9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/51386
Reviewed-by: Stefan Reinauer <reinauer@google.com>
This commit is contained in:
Aaron Durbin 2013-05-10 00:33:32 -05:00 • committed by ChromeBot
commit 2e9e50142f
10 changed files with 168 additions and 0 deletions
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29
src/include/cpu/x86/car.h
View file

@ -28,4 +28,33 @@
#define CAR_CBMEM
#endif
#if CONFIG_CAR_MIGRATION && defined(__PRE_RAM__)
#define CAR_MIGRATE_ATTR __attribute__ ((used,section (".car.migrate")))
/* Call migrate_fn_() when CAR globals are migrated. */
#define CAR_MIGRATE(migrate_fn_) \
static void (* const migrate_fn_ ## _ptr)(void) CAR_MIGRATE_ATTR = \
migrate_fn_;
/* Get the correct pointer for the CAR global variable. */
void *car_get_var_ptr(void *var);
/* Get and set a primitive type global variable. */
#define car_get_var(var) \
*(typeof(var) *)car_get_var_ptr(&(var))
#define car_set_var(var, val) \
do { car_get_var(var) = (val); } while(0)
/* Migrate the CAR variables to memory. */
void car_migrate_variables(void);
#else
#define CAR_MIGRATE(migrate_fn_)
static inline void *car_get_var_ptr(void *var) { return var; }
#define car_get_var(var) (var)
#define car_set_var(var, val) do { (var) = (val); } while (0)
static inline void car_migrate_variables(void) { }
#endif
#endif