Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/swap.h> /* for totalram_pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	int idx, type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	type = kmap_atomic_idx_push();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	idx = type + KM_TYPE_NR*smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	BUG_ON(!pte_none(*(kmap_pte-idx)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	set_pte(kmap_pte-idx, mk_pte(page, prot));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	arch_flush_lazy_mmu_mode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	return (void *)vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) EXPORT_SYMBOL(kmap_atomic_high_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * This is the same as kmap_atomic() but can map memory that doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * have a struct page associated with it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void *kmap_atomic_pfn(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return kmap_atomic_prot_pfn(pfn, kmap_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) EXPORT_SYMBOL_GPL(kmap_atomic_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void kunmap_atomic_high(void *kvaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (vaddr >= __fix_to_virt(FIX_KMAP_END) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	    vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		int idx, type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		type = kmap_atomic_idx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		idx = type + KM_TYPE_NR * smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #ifdef CONFIG_DEBUG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		 * Force other mappings to Oops if they'll try to access this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		 * pte without first remap it.  Keeping stale mappings around
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		 * is a bad idea also, in case the page changes cacheability
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		 * attributes or becomes a protected page in a hypervisor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		kpte_clear_flush(kmap_pte-idx, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		kmap_atomic_idx_pop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		arch_flush_lazy_mmu_mode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #ifdef CONFIG_DEBUG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		BUG_ON(vaddr < PAGE_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		BUG_ON(vaddr >= (unsigned long)high_memory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) EXPORT_SYMBOL(kunmap_atomic_high);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void __init set_highmem_pages_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	struct zone *zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	int nid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	 * Explicitly reset zone->managed_pages because set_highmem_pages_init()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	 * is invoked before memblock_free_all()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	reset_all_zones_managed_pages();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	for_each_zone(zone) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		unsigned long zone_start_pfn, zone_end_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		if (!is_highmem(zone))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 		zone_start_pfn = zone->zone_start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 		zone_end_pfn = zone_start_pfn + zone->spanned_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 		nid = zone_to_nid(zone);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 		printk(KERN_INFO "Initializing %s for node %d (%08lx:%08lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 				zone->name, nid, zone_start_pfn, zone_end_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 		add_highpages_with_active_regions(nid, zone_start_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 				 zone_end_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }