19 struct region {  struct
25 static struct region __initdata mem[MPU_MAX_REGIONS];  argument
27 static struct region __initdata xip[MPU_MAX_REGIONS];
46 /* Region number */
52 /* Data-side / unified region attributes */
54 /* Region access control register */
60 /* Region size register */
66 /* Region base address register */
76 /* Optional instruction-side region attributes */
78 /* I-side Region access control register */
84 /* I-side Region size register */
90 /* I-side Region base address register */
108 /* Data-side / unified region attributes */
110 /* Region access control register */
118 /* Region size register */
126 /* Region base address register */
137 /* ARMv7-M only supports a unified MPU, so I-side operations are nop */
146 static bool __init try_split_region(phys_addr_t base, phys_addr_t size, struct region *region)  in try_split_region()  argument
149 	phys_addr_t abase = base & ~(size - 1);  in try_split_region()
150 	phys_addr_t asize = base + size - abase;  in try_split_region()
157 	bdiff = base - abase;  in try_split_region()
158 	sdiff = p2size - asize;  in try_split_region()
177 			_set_bit(i, &region->subreg);  in try_split_region()
180 			_set_bit(PMSAv7_NR_SUBREGS - i, &region->subreg);  in try_split_region()
183 	region->base = abase;  in try_split_region()
184 	region->size = p2size;  in try_split_region()
190 				  unsigned int limit, struct region *regions)  in allocate_region()
197 		/* Try cover region as is (maybe with help of subregions) */  in allocate_region()
201 			diff -= size;  in allocate_region()
205 			 * Maximum aligned region might overflow phys_addr_t  in allocate_region()
207 			 * until we take the smaller of the aligned region  in allocate_region()
208 			 * size ("asize") and rounded region size ("p2size"),  in allocate_region()
212 			phys_addr_t asize = (base - 1) ^ base;  in allocate_region()
213 			phys_addr_t p2size = (1 <<  __fls(diff)) - 1;  in allocate_region()
224 		attempts--;  in allocate_region()
241 	/* Free-up PMSAv7_PROBE_REGION */  in pmsav7_adjust_lowmem_bounds()
249 	/* We need to keep one slot for background region */  in pmsav7_adjust_lowmem_bounds()
250 	mem_max_regions--;  in pmsav7_adjust_lowmem_bounds()
254 	mem_max_regions--;  in pmsav7_adjust_lowmem_bounds()
259 	num = allocate_region(CONFIG_XIP_PHYS_ADDR, __pa(_exiprom) - CONFIG_XIP_PHYS_ADDR,  in pmsav7_adjust_lowmem_bounds()
262 	mem_max_regions -= num;  in pmsav7_adjust_lowmem_bounds()
270 			 * Initially only use memory continuous from  in pmsav7_adjust_lowmem_bounds()
273 				panic("First memory bank must be contiguous from PHYS_OFFSET");  in pmsav7_adjust_lowmem_bounds()
277 			specified_mem_size = mem_end - mem_start;  in pmsav7_adjust_lowmem_bounds()
284 			pr_notice("Ignoring RAM after %pa, memory at %pa ignored\n",  in pmsav7_adjust_lowmem_bounds()
286 			memblock_remove(reg_start, 0 - reg_start);  in pmsav7_adjust_lowmem_bounds()
297 		total_mem_size += mem[i].size - subreg * hweight_long(mem[i].subreg);  in pmsav7_adjust_lowmem_bounds()
304 		pr_warn("Truncating memory from %pa to %pa (MPU region constraints)",  in pmsav7_adjust_lowmem_bounds()
307 				specified_mem_size - total_mem_size);  in pmsav7_adjust_lowmem_bounds()
315 	 * have separate instruction and data memory maps then return  in __mpu_max_regions()
324 	/* Check for separate d-side and i-side memory maps */  in __mpu_max_regions()
334 	/* MPUIR.nU specifies whether there is *not* a unified memory map */  in mpu_iside_independent()
342 	/* We've kept a region free for this probing */  in __mpu_min_region_order()
347 	 * region order  in __mpu_min_region_order()
352 	/* If the MPU is non-unified, we use the larger of the two minima*/  in __mpu_min_region_order()
358 	isb(); /* Ensure that MPU region operations have completed */  in __mpu_min_region_order()
370 	/* We kept a region free for probing resolution of MPU regions*/  in mpu_setup_region()
373 		return -ENOENT;  in mpu_setup_region()
376 		return -ENOMEM;  in mpu_setup_region()
379 		return -ENOMEM;  in mpu_setup_region()
381 	/* Writing N to bits 5:1 (RSR_SZ)  specifies region size 2^N+1 */  in mpu_setup_region()
382 	size_data = ((size_order - 1) << PMSAv7_RSR_SZ) | 1 << PMSAv7_RSR_EN;  in mpu_setup_region()
393 	isb(); /* Propagate properties before enabling region */  in mpu_setup_region()
396 	/* Check for independent I-side registers */  in mpu_setup_region()
405 	/* Store region info (we treat i/d side the same, so only store d) */  in mpu_setup_region()
420 	int i, region = 0, err = 0;  in pmsav7_setup()  local
425 	err |= mpu_setup_region(region++, 0, 32,  in pmsav7_setup()
433                  * In case we overwrite RAM region we set earlier in  in pmsav7_setup()
434                  * head-nommu.S (which is cachable) all subsequent  in pmsav7_setup()
436                  * with BG region (which is uncachable), thus we need  in pmsav7_setup()
439 		bool need_flush = region == PMSAv7_RAM_REGION;  in pmsav7_setup()
444 		err |= mpu_setup_region(region++, xip[i].base, ilog2(xip[i].size),  in pmsav7_setup()
455 		err |= mpu_setup_region(region++, mem[i].base, ilog2(mem[i].size),  in pmsav7_setup()
462 	err |= mpu_setup_region(region++, vectors_base, ilog2(2 * PAGE_SIZE),  in pmsav7_setup()
467 		panic("MPU region initialization failure! %d", err);  in pmsav7_setup()
470 			 "Region independence: %s, Used %d of %d regions\n",  in pmsav7_setup()