1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 1995-2005 Russell King
23 #include <linux/dma-direct.h>
24 #include <linux/dma-map-ops.h>
37 #include <asm/kernel-pgtable.h>
52 s64 memstart_addr __ro_after_init = -1;
57  * and ZONE_DMA32. By default ZONE_DMA covers the 32-bit addressable memory
58  * unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4).
59  * In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memory,
63  * depending on DMA memory zones configs (ZONE_DMA) --
69  * mappings (greater than page-granularity) for all the memory bank rangs.
78  * so page-granularity mappings are created for the entire memory range.
81  * Note: Page-granularity mapppings are necessary for crash kernel memory
92  * reserve_crashkernel() - reserves memory for crash kernel
116 			pr_warn("cannot allocate crashkernel (size:0x%llx)\n",  in reserve_crashkernel()
139 	pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",  in reserve_crashkernel()
143 	crashk_res.end = crash_base + crash_size - 1;  in reserve_crashkernel()
172  * reserve_elfcorehdr() - reserves memory for elf core header
193 	pr_info("Reserving %lldKB of memory at 0x%llx for elfcorehdr\n",  in reserve_elfcorehdr()
204  * limit. If DRAM starts above 32-bit, expand the zone to the maximum
205  * available memory, otherwise cap it at 32-bit.
217 	return min(zone_mask, memblock_end_of_DRAM() - 1) + 1;  in max_zone_phys()
301 	reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);  in early_init_dt_scan_usablemem()
305 	usablemem->base = dt_mem_next_cell(dt_root_addr_cells, &reg);  in early_init_dt_scan_usablemem()
306 	usablemem->size = dt_mem_next_cell(dt_root_size_cells, &reg);  in early_init_dt_scan_usablemem()
325 	const s64 linear_region_size = BIT(vabits_actual - 1);  in arm64_memblock_init()
327 	/* Handle linux,usable-memory-range property */  in arm64_memblock_init()
341 	 * linear mapping. Take care not to clip the kernel which may be  in arm64_memblock_init()
342 	 * high in memory.  in arm64_memblock_init()
348 		memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size,  in arm64_memblock_init()
354 	 * If we are running with a 52-bit kernel VA config on a system that  in arm64_memblock_init()
356 	 * memory in the 48-bit addressable part of the linear region, i.e.,  in arm64_memblock_init()
361 		memstart_addr -= _PAGE_OFFSET(48) - _PAGE_OFFSET(52);  in arm64_memblock_init()
365 	 * high up in memory, add back the kernel region that must be accessible  in arm64_memblock_init()
370 		memblock_add(__pa_symbol(_text), (u64)(_end - _text));  in arm64_memblock_init()
377 		 * Otherwise, this is a no-op  in arm64_memblock_init()
380 		u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - base;  in arm64_memblock_init()
393 			"initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {  in arm64_memblock_init()
404 		u64 range = linear_region_size -  in arm64_memblock_init()
405 			    (memblock_end_of_DRAM() - memblock_start_of_DRAM());  in arm64_memblock_init()
414 			memstart_addr -= ARM64_MEMSTART_ALIGN *  in arm64_memblock_init()
423 	memblock_reserve(__pa_symbol(_text), _end - _text);  in arm64_memblock_init()
437 	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;  in arm64_memblock_init()
496 	start_pg = pfn_to_page(start_pfn - 1) + 1;  in free_memmap()
497 	end_pg = pfn_to_page(end_pfn - 1) + 1;  in free_memmap()
511 		memblock_free(pg, pgend - pg);  in free_memmap()
565 	set_max_mapnr(max_pfn - PHYS_PFN_OFFSET);  in mem_init()
603 	unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));  in free_initmem()