1// SPDX-License-Identifier: GPL-2.0-only
 2#include <linux/highmem.h>
 3#include <linux/export.h>
 4#include <linux/swap.h> /* for totalram_pages */
 5#include <linux/memblock.h>
 6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 7void __init set_highmem_pages_init(void)
 8{
 9	struct zone *zone;
10	int nid;
11
12	/*
13	 * Explicitly reset zone->managed_pages because set_highmem_pages_init()
14	 * is invoked before memblock_free_all()
15	 */
16	reset_all_zones_managed_pages();
17	for_each_zone(zone) {
18		unsigned long zone_start_pfn, zone_end_pfn;
19
20		if (!is_highmem(zone))
21			continue;
22
23		zone_start_pfn = zone->zone_start_pfn;
24		zone_end_pfn = zone_start_pfn + zone->spanned_pages;
25
26		nid = zone_to_nid(zone);
27		printk(KERN_INFO "Initializing %s for node %d (%08lx:%08lx)\n",
28				zone->name, nid, zone_start_pfn, zone_end_pfn);
29
30		add_highpages_with_active_regions(nid, zone_start_pfn,
31				 zone_end_pfn);
32	}
33}

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