diff options
Diffstat (limited to 'include/lib/aarch64/xlat_tables.h')
| -rw-r--r-- | include/lib/aarch64/xlat_tables.h | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/include/lib/aarch64/xlat_tables.h b/include/lib/aarch64/xlat_tables.h index 0b5dbdf2..d21100e3 100644 --- a/include/lib/aarch64/xlat_tables.h +++ b/include/lib/aarch64/xlat_tables.h @@ -52,21 +52,41 @@ #define MAP_REGION(pa, va, sz, attr) {(pa), (va), (sz), (attr)} /* - * Flags for building up memory mapping attributes. - * These are organised so that a clear bit gives a more restrictive mapping - * that a set bit, that way a bitwise-and two sets of attributes will never give - * an attribute which has greater access rights that any of the original - * attributes. + * Shifts and masks to access fields of an mmap_attr_t + */ +#define MT_TYPE_MASK 0x7 +#define MT_TYPE(_attr) ((_attr) & MT_TYPE_MASK) +/* Access permissions (RO/RW) */ +#define MT_PERM_SHIFT 3 +/* Security state (SECURE/NS) */ +#define MT_SEC_SHIFT 4 + +/* + * Memory mapping attributes */ typedef enum { - MT_DEVICE = 0 << 0, - MT_MEMORY = 1 << 0, + /* + * Memory types supported. + * These are organised so that, going down the list, the memory types + * are getting weaker; conversely going up the list the memory types are + * getting stronger. + */ + MT_DEVICE, + MT_NON_CACHEABLE, + MT_MEMORY, + /* Values up to 7 are reserved to add new memory types in the future */ - MT_RO = 0 << 1, - MT_RW = 1 << 1, + /* + * The following values are organised so that a clear bit gives a more + * restrictive mapping than a set bit, that way a bitwise-and of two + * sets of attributes will never give an attribute which has greater + * access rights than any of the original attributes. + */ + MT_RO = 0 << MT_PERM_SHIFT, + MT_RW = 1 << MT_PERM_SHIFT, - MT_SECURE = 0 << 2, - MT_NS = 1 << 2 + MT_SECURE = 0 << MT_SEC_SHIFT, + MT_NS = 1 << MT_SEC_SHIFT, } mmap_attr_t; /* |