diff options
Diffstat (limited to 'src/arch/x86/assembly_entry.S')
| -rw-r--r-- | src/arch/x86/assembly_entry.S | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/src/arch/x86/assembly_entry.S b/src/arch/x86/assembly_entry.S index ec3888fa43..86dbba4668 100644 --- a/src/arch/x86/assembly_entry.S +++ b/src/arch/x86/assembly_entry.S @@ -14,21 +14,35 @@ * GNU General Public License for more details. */ -#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK) +#include <rules.h> /* - * This path is for stages that post bootblock when employing - * CONFIG_C_ENVIRONMENT_BOOTBLOCK. There's no need to re-load the gdt, etc - * as all those settings are cached within the processor. In order to - * continue with C code execution one needs to set stack pointer and clear - * CAR_GLOBAL variables that are stage specific. + *Take the path where CAR_GLOBAL variables just need to be cleared when + * verstage runs directly after bootblock. + */ +#define ROMSTAGE_AFTER_VERSTAGE \ + (IS_ENABLED(CONFIG_SEPARATE_VERSTAGE) && \ + IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK) && ENV_ROMSTAGE) + +#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK) || ROMSTAGE_AFTER_VERSTAGE + +/* + * This path is for stages that are post bootblock when employing + * CONFIG_C_ENVIRONMENT_BOOTBLOCK or any intermediate stage succeeding + * the first stage to initialize protected mode. There's no need to re-load + * the gdt, etc as all those settings are cached within the processor. In + * order to continue with C code execution one needs to set stack pointer and + * clear CAR_GLOBAL variables that are stage specific. */ .section ".text._start", "ax", @progbits .global _start _start: +/* _car_stack_end symbol is only valid when bootblock does CAR setup. */ +#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK) /* reset stack pointer to CAR stack */ mov $_car_stack_end, %esp +#endif /* clear CAR_GLOBAL area as it is not shared */ cld |