1 // SPDX-License-Identifier: GPL-2.0-only
65  * in non-PAE compilation mode, since the middle layer is folded.
187 	BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)  in page_table_kmap_check()
245  * of max_low_pfn pages, by creating page tables starting from address
270 	 * First iteration will setup identity mapping using large/small pages  in kernel_physical_mapping_init()
279 	 *     "Software should not write to a paging-structure entry in a way  in kernel_physical_mapping_init()
309 			 * Map with big pages if possible, otherwise  in kernel_physical_mapping_init()
324 				addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +  in kernel_physical_mapping_init()
325 					PAGE_OFFSET + PAGE_SIZE-1;  in kernel_physical_mapping_init()
428 	 * in the 32-bit EFI stub.  in sync_initial_page_table()
446 	 * memory from the boot time page table.  in native_pagetable_init()
447 	 * In virtual address space, we should have at least two pages  in native_pagetable_init()
453 	for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) {  in native_pagetable_init()
486  * the boot process.
502 	 * created - mappings will be set by set_fixmap():  in early_ioremap_page_table_range_init()
504 	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;  in early_ioremap_page_table_range_init()
505 	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;  in early_ioremap_page_table_range_init()
523 /* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
526 /* user-defined highmem size */
527 static unsigned int highmem_pages = -1;
537 		return -EINVAL;  in parse_highmem()
545 	"highmem size (%luMB) is bigger than pages available (%luMB)!\n"
550  * All of RAM fits into lowmem - but if user wants highmem
551  * artificially via the highmem=x boot parameter then create
559 	if (highmem_pages == -1)  in lowmem_pfn_init()
568 		if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {  in lowmem_pfn_init()
573 		max_low_pfn -= highmem_pages;  in lowmem_pfn_init()
577 		printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");  in lowmem_pfn_init()
582 	"only %luMB highmem pages available, ignoring highmem size of %luMB!\n"
587  * We have more RAM than fits into lowmem - we try to put it into
588  * highmem, also taking the highmem=x boot parameter into account:
594 	if (highmem_pages == -1)  in highmem_pfn_init()
595 		highmem_pages = max_pfn - MAXMEM_PFN;  in highmem_pfn_init()
602 			pages_to_mb(max_pfn - MAXMEM_PFN),  in highmem_pfn_init()
645 		pages_to_mb(highend_pfn - highstart_pfn));  in initmem_init()
646 	high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;  in initmem_init()
648 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;  in initmem_init()
667 	printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",  in setup_bootmem_allocator()
669 	printk(KERN_INFO "  low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);  in setup_bootmem_allocator()
673  * paging_init() sets up the page tables - note that the first 8MB are
677  * that we can trap those pesky NULL-reference errors in the kernel.
725 	 * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to  in mem_init()
728 	 * pages that was already passed to the buddy allocator, hence marked as  in mem_init()
745 #define __FIXADDR_TOP (-PAGE_SIZE)  in mem_init()
750 #define high_memory (-128UL << 20)  in mem_init()
777 	unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;  in mark_nxdata_nx()
780 		printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);  in mark_nxdata_nx()
787 	unsigned long size = (unsigned long)__end_rodata - start;  in mark_rodata_ro()
790 	pr_info("Write protecting kernel text and read-only data: %luk\n",  in mark_rodata_ro()
796 	pr_info("Testing CPA: Reverting %lx-%lx\n", start, start + size);  in mark_rodata_ro()