1 // SPDX-License-Identifier: GPL-2.0-or-later
4  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
9  *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
18 #include <linux/dma-direct.h>
29 #include <asm/code-patching.h>
35 unsigned long long memory_limit __initdata;
37 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
40 pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,  in __phys_mem_access_prot()
64 int __weak create_section_mapping(unsigned long start, unsigned long end,  in create_section_mapping()
67 	return -ENODEV;  in create_section_mapping()
70 int __weak remove_section_mapping(unsigned long start, unsigned long end)  in remove_section_mapping()
72 	return -ENODEV;  in remove_section_mapping()
80 	start = (unsigned long)__va(start);  in arch_create_linear_mapping()
83 				    params->pgprot);  in arch_create_linear_mapping()
88 		return -EFAULT;  in arch_create_linear_mapping()
98 	start = (unsigned long)__va(start);  in arch_remove_linear_mapping()
119 	unsigned long end_pfn = PFN_UP(start + size);  in update_end_of_memory_vars()
124 		high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;  in update_end_of_memory_vars()
128 int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,  in add_pages()
147 	unsigned long start_pfn = start >> PAGE_SHIFT;  in arch_add_memory()
148 	unsigned long nr_pages = size >> PAGE_SHIFT;  in arch_add_memory()
162 	unsigned long start_pfn = start >> PAGE_SHIFT;  in arch_remove_memory()
163 	unsigned long nr_pages = size >> PAGE_SHIFT;  in arch_remove_memory()
193 	unsigned long spfn, epfn, prev = 0;  in mark_nonram_nosave()
215  * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
219  * By using 31-bit unconditionally, we can exploit zone_dma_limit to inform the
220  * generic DMA mapping code.  32-bit only devices (if not handled by an IOMMU
224 static unsigned long max_zone_pfns[MAX_NR_ZONES];
227  * paging_init() sets up the page tables - in fact we've already done this.
231 	unsigned long long total_ram = memblock_phys_mem_size();  in paging_init()
236 	unsigned long v = __fix_to_virt(FIX_KMAP_END);  in paging_init()
237 	unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);  in paging_init()
246 	printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",  in paging_init()
247 	       (unsigned long long)top_of_ram, total_ram);  in paging_init()
249 	       (long int)((top_of_ram - total_ram) >> 20));  in paging_init()
252 	 * Allow 30-bit DMA for very limited Broadcom wifi chips on many  in paging_init()
264 				      1UL << (zone_dma_bits - PAGE_SHIFT));  in paging_init()
280 	 * a 4-bit field for slices.  in mem_init()
286 	 * Some platforms (e.g. 85xx) limit DMA-able memory way below  in mem_init()
287 	 * 4G. We force memblock to bottom-up mode to ensure that the  in mem_init()
288 	 * memory allocated in swiotlb_init() is DMA-able.  in mem_init()
290 	 * back to to-down.  in mem_init()
302 		unsigned long pfn, highmem_mapnr;  in mem_init()
317 	 * functions.... do it here for the non-smp case.  in mem_init()
320 		(mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;  in mem_init()
370 			res->name = "System RAM";  in add_system_ram_resources()
371 			res->start = start;  in add_system_ram_resources()
377 			res->end = end - 1;  in add_system_ram_resources()
378 			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;  in add_system_ram_resources()
392  * Access has to be given to non-kernel-ram areas as well, these contain the
395 int devmem_is_allowed(unsigned long pfn)  in devmem_is_allowed()
419 	unsigned long va;  in prealloc_execmem_pgtable()
432 	unsigned long fallback_start = 0, fallback_end = 0;  in execmem_arch_setup()
433 	unsigned long start, end;  in execmem_arch_setup()
440 	unsigned long limit = (unsigned long)_etext - SZ_32M;  in execmem_arch_setup()