diff options
Diffstat (limited to 'src/include/cpu')
| -rw-r--r-- | src/include/cpu/x86/mtrr.h | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/include/cpu/x86/mtrr.h b/src/include/cpu/x86/mtrr.h index f1e067a26b..dde9a2888b 100644 --- a/src/include/cpu/x86/mtrr.h +++ b/src/include/cpu/x86/mtrr.h @@ -1,6 +1,8 @@ #ifndef CPU_X86_MTRR_H #define CPU_X86_MTRR_H +#include <commonlib/helpers.h> + /* These are the region types */ #define MTRR_TYPE_UNCACHEABLE 0 #define MTRR_TYPE_WRCOMB 1 @@ -152,12 +154,20 @@ static inline unsigned int fls(unsigned int x) to get a power of 2 again, for a single MTRR. */ #define CAR_END (CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE) #if CAR_END > OPTIMAL_CACHE_ROM_BASE -# define CACHE_ROM_SIZE _ALIGN_DOWN_POW2(_FROM_4G_TOP(CAR_END)) +# define CAR_CACHE_ROM_SIZE _ALIGN_DOWN_POW2(_FROM_4G_TOP(CAR_END)) #else -# define CACHE_ROM_SIZE OPTIMAL_CACHE_ROM_SIZE +# define CAR_CACHE_ROM_SIZE OPTIMAL_CACHE_ROM_SIZE +#endif +#if ((CAR_CACHE_ROM_SIZE & (CAR_CACHE_ROM_SIZE - 1)) != 0) +# error "CAR CACHE_ROM_SIZE is not a power of 2, _POW2_MASK needs refinement." #endif -#if ((CACHE_ROM_SIZE & (CACHE_ROM_SIZE - 1)) != 0) -# error "CACHE_ROM_SIZE is not a power of 2, _POW2_MASK needs refinement." + +/* Last but not least, most (if not all) chipsets have MMIO + between 0xfe000000 and 0xff000000, so limit to 16MiB. */ +#if CAR_CACHE_ROM_SIZE >= 16 * MiB +# define CACHE_ROM_SIZE (16 * MiB) +#else +# define CACHE_ROM_SIZE CAR_CACHE_ROM_SIZE #endif #define CACHE_ROM_BASE _FROM_4G_TOP(CACHE_ROM_SIZE) |