#ifndef _MPX_HW_H #define _MPX_HW_H #include /* Describe the MPX Hardware Layout in here */ #define NR_MPX_BOUNDS_REGISTERS 4 #ifdef __i386__ #define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 16 /* 4 * 32-bits */ #define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 14) /* 16k */ #define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 4 #define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 22) /* 4MB */ #define MPX_BOUNDS_TABLE_BOTTOM_BIT 2 #define MPX_BOUNDS_TABLE_TOP_BIT 11 #define MPX_BOUNDS_DIR_BOTTOM_BIT 12 #define MPX_BOUNDS_DIR_TOP_BIT 31 #else /* * Linear Address of "pointer" (LAp) * 0 -> 2: ignored * 3 -> 19: index in to bounds table * 20 -> 47: index in to bounds directory * 48 -> 63: ignored */ #define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 32 #define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 22) /* 4MB */ #define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 8 #define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 31) /* 2GB */ #define MPX_BOUNDS_TABLE_BOTTOM_BIT 3 #define MPX_BOUNDS_TABLE_TOP_BIT 19 #define MPX_BOUNDS_DIR_BOTTOM_BIT 20 #define MPX_BOUNDS_DIR_TOP_BIT 47 #endif #define MPX_BOUNDS_DIR_NR_ENTRIES \ (MPX_BOUNDS_DIR_SIZE_BYTES/MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES) #define MPX_BOUNDS_TABLE_NR_ENTRIES \ (MPX_BOUNDS_TABLE_SIZE_BYTES/MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES) #define MPX_BOUNDS_TABLE_ENTRY_VALID_BIT 0x1 struct mpx_bd_entry { union { char x[MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES]; void *contents[1]; }; } __attribute__((packed)); struct mpx_bt_entry { union { char x[MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES]; unsigned long contents[1]; }; } __attribute__((packed)); struct mpx_bounds_dir { struct mpx_bd_entry entries[MPX_BOUNDS_DIR_NR_ENTRIES]; } __attribute__((packed)); struct mpx_bounds_table { struct mpx_bt_entry entries[MPX_BOUNDS_TABLE_NR_ENTRIES]; } __attribute__((packed)); static inline unsigned long GET_BITS(unsigned long val, int bottombit, int topbit) { int total_nr_bits = topbit - bottombit; unsigned long mask = (1UL << total_nr_bits)-1; return (val >> bottombit) & mask; } static inline unsigned long __vaddr_bounds_table_index(void *vaddr) { return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_TABLE_BOTTOM_BIT, MPX_BOUNDS_TABLE_TOP_BIT); } static inline unsigned long __vaddr_bounds_directory_index(void *vaddr) { return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_DIR_BOTTOM_BIT, MPX_BOUNDS_DIR_TOP_BIT); } static inline struct mpx_bd_entry *mpx_vaddr_to_bd_entry(void *vaddr, struct mpx_bounds_dir *bounds_dir) { unsigned long index = __vaddr_bounds_directory_index(vaddr); return &bounds_dir->entries[index]; } static inline int bd_entry_valid(struct mpx_bd_entry *bounds_dir_entry) { unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents; return (__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT); } static inline struct mpx_bounds_table * __bd_entry_to_bounds_table(struct mpx_bd_entry *bounds_dir_entry) { unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents; assert(__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT); __bd_entry &= ~MPX_BOUNDS_TABLE_ENTRY_VALID_BIT; return (struct mpx_bounds_table *)__bd_entry; } static inline struct mpx_bt_entry * mpx_vaddr_to_bt_entry(void *vaddr, struct mpx_bounds_dir *bounds_dir) { struct mpx_bd_entry *bde = mpx_vaddr_to_bd_entry(vaddr, bounds_dir); struct mpx_bounds_table *bt = __bd_entry_to_bounds_table(bde); unsigned long index = __vaddr_bounds_table_index(vaddr); return &bt->entries[index]; } #endif /* _MPX_HW_H */ git-panel'>diff options

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