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arch/x86: allow global .bss objects without CAR_GLOBAL 

For platforms utilizing CONFIG_NO_CAR_GLOBAL_MIGRATION there's
no need to automatically migrate globals. Because of this it's
possible to automatically allow for uninitialized global variables
which reside in the .bss section without needing to decorate those
objects with CAR_GLOBAL.

Change-Id: Icae806fecd936ed2ebf0c13d30ffa07c77a95150
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/29359
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Aaron Durbin 2018-10-30 12:15:10 -06:00
parent 946d3f9309
commit 76ab2b7a8a
2 changed files with 17 additions and 2 deletions
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15
src/arch/x86/car.ld
View File

@ -71,7 +71,17 @@
* cbmem console. This is useful for clearing this area on a per-stage
* basis when more than one stage uses cache-as-ram for CAR_GLOBALs. */
_car_global_start = .;
#if IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
/* Allow global unitialized variables when CAR_GLOBALs are not used. */
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
#else
/* .car.global_data objects only around when
* !CONFIG_NO_CAR_GLOBAL_MIGRATION is employed. */
*(.car.global_data);
#endif
. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
_car_global_end = .;
_car_relocatable_data_end = .;
@ -88,10 +98,15 @@
.illegal_globals . : {
*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data)
*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data.*)
#if !IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
#else
/* In case something sneaks through when it shouldn't. */
*(.car.global_data);
#endif
}
_bogus = ASSERT((CONFIG_DCACHE_RAM_SIZE == 0) || (SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");

4
src/arch/x86/include/arch/early_variables.h
View File

@ -20,7 +20,7 @@
#include <stdlib.h>
#include <rules.h>
#if ENV_CACHE_AS_RAM
#if ENV_CACHE_AS_RAM && !IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
asm(".section .car.global_data,\"w\",@nobits");
asm(".previous");
#ifdef __clang__
@ -34,7 +34,7 @@ asm(".previous");
* accessed unconditionally because cbmem is never initialized until romstage
* when dram comes up.
*/
#if ENV_VERSTAGE || ENV_BOOTBLOCK || IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
#if ENV_VERSTAGE || ENV_BOOTBLOCK
static inline void *car_get_var_ptr(void *var)
{
return var;