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  *   €l–Ь4э( ©і( 	ЕЂfаB¦-яБѓqЧ™_†I|ҐЏ+БА     /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_HIGHMEM_INTERNAL_H
#define _LINUX_HIGHMEM_INTERNAL_H

/*
 * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
 */
#ifdef CONFIG_KMAP_LOCAL
void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
void kunmap_local_indexed(const void *vaddr);
void kmap_local_fork(struct task_struct *tsk);
void __kmap_local_sched_out(void);
void __kmap_local_sched_in(void);
static inline void kmap_assert_nomap(void)
{
	DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);
}
#else
static inline void kmap_local_fork(struct task_struct *tsk) { }
static inline void kmap_assert_nomap(void) { }
#endif

#ifdef CONFIG_HIGHMEM
#include <asm/highmem.h>

#ifndef ARCH_HAS_KMAP_FLUSH_TLB
static inline void kmap_flush_tlb(unsigned long addr) { }
#endif

#ifndef kmap_prot
#define kmap_prot PAGE_KERNEL
#endif

void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
void __kmap_flush_unused(void);
struct page *__kmap_to_page(void *addr);

static inline void *kmap(struct page *page)
{
	void *addr;

	might_sleep();
	if (!PageHighMem(page))
		addr = page_address(page);
	else
		addr = kmap_high(page);
	kmap_flush_tlb((unsigned long)addr);
	return addr;
}

static inline void kunmap(struct page *page)
{
	might_sleep();
	if (!PageHighMem(page))
		return;
	kunmap_high(page);
}

static inline struct page *kmap_to_page(void *addr)
{
	return __kmap_to_page(addr);
}

static inline void kmap_flush_unused(void)
{
	__kmap_flush_unused();
}

static inline void *kmap_local_page(struct page *page)
{
	return __kmap_local_page_prot(page, kmap_prot);
}

static inline void *kmap_local_page_try_from_panic(struct page *page)
{
	if (!PageHighMem(page))
		return page_address(page);
	/* If the page is in HighMem, it's not safe to kmap it.*/
	return NULL;
}

static inline void *kmap_local_folio(struct folio *folio, size_t offset)
{
	struct page *page = folio_page(folio, offset / PAGE_SIZE);
	return __kmap_local_page_prot(page, kmap_prot) + offset % PAGE_SIZE;
}

static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
{
	return __kmap_local_page_prot(page, prot);
}

static inline void *kmap_local_pfn(unsigned long pfn)
{
	return __kmap_local_pfn_prot(pfn, kmap_prot);
}

static inline void __kunmap_local(const void *vaddr)
{
	kunmap_local_indexed(vaddr);
}

static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
{
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_disable();
	else
		preempt_disable();

	pagefault_disable();
	return __kmap_local_page_prot(page, prot);
}

static inline void *kmap_atomic(struct page *page)
{
	return kmap_atomic_prot(page, kmap_prot);
}

static inline void *kmap_atomic_pfn(unsigned long pfn)
{
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_disable();
	else
		preempt_disable();

	pagefault_disable();
	return __kmap_local_pfn_prot(pfn, kmap_prot);
}

static inline void __kunmap_atomic(const void *addr)
{
	kunmap_local_indexed(addr);
	pagefault_enable();
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_enable();
	else
		preempt_enable();
}

unsigned int __nr_free_highpages(void);
extern atomic_long_t _totalhigh_pages;

static inline unsigned int nr_free_highpages(void)
{
	return __nr_free_highpages();
}

static inline unsigned long totalhigh_pages(void)
{
	return (unsigned long)atomic_long_read(&_totalhigh_pages);
}

static inline void totalhigh_pages_add(long count)
{
	atomic_long_add(count, &_totalhigh_pages);
}

static inline bool is_kmap_addr(const void *x)
{
	unsigned long addr = (unsigned long)x;

	return (addr >= PKMAP_ADDR(0) && addr < PKMAP_ADDR(LAST_PKMAP)) ||
		(addr >= __fix_to_virt(FIX_KMAP_END) &&
		 addr < __fix_to_virt(FIX_KMAP_BEGIN));
}
#else /* CONFIG_HIGHMEM */

static inline struct page *kmap_to_page(void *addr)
{
	return virt_to_page(addr);
}

static inline void *kmap(struct page *page)
{
	might_sleep();
	return page_address(page);
}

static inline void kunmap_high(struct page *page) { }
static inl