diff options
Diffstat (limited to 'src/arch/x86/include')
| -rw-r--r-- | src/arch/x86/include/arch/cpu.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/arch/x86/include/arch/cpu.h b/src/arch/x86/include/arch/cpu.h index f50901fe73..5c26bcf74d 100644 --- a/src/arch/x86/include/arch/cpu.h +++ b/src/arch/x86/include/arch/cpu.h @@ -15,6 +15,7 @@ #define ARCH_CPU_H #include <stdint.h> +#include <stddef.h> #include <rules.h> /* @@ -246,6 +247,42 @@ static inline void get_fms(struct cpuinfo_x86 *c, uint32_t tfms) * cache-as-ram. */ void asmlinkage car_stage_entry(void); + +/* + * Support setting up a stack frame consisting of MTRR information + * for use in bootstrapping the caching attributes after cache-as-ram + * is torn down. + */ + +struct postcar_frame { + uintptr_t stack; + uint32_t upper_mask; + int max_var_mttrs; + int num_var_mttrs; +}; + +/* + * Initialize postcar_frame object allocating stack size in cbmem + * with the provided size. Returns 0 on success, < 0 on error. + */ +int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size); + +/* + * Add variable MTRR covering the provided range with MTRR type. + */ +void postcar_frame_add_mtrr(struct postcar_frame *pcf, + uintptr_t addr, size_t size, int type); + +/* + * Load and run a program that takes control of execution that + * tears down CAR and loads ramstage. The postcar_frame object + * indicates how to set up the frame. If caching is enabled at + * the time of the call it is up to the platform code to handle + * coherency with dirty lines in the cache using some mechansim + * such as platform_prog_run() because run_postcar_phase() + * utilizes prog_run() internally. + */ +void run_postcar_phase(struct postcar_frame *pcf); #endif #endif /* ARCH_CPU_H */ |