add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nds32/mm/highmem.c
..
..
@@ -6,49 +6,22 @@
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 #include <linux/sched.h>
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 #include <linux/smp.h>
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 #include <linux/interrupt.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <asm/fixmap.h>
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 #include <asm/tlbflush.h>
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-void *kmap(struct page *page)
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-{
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-	unsigned long vaddr;
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-	might_sleep();
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-	if (!PageHighMem(page))
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-		return page_address(page);
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-	vaddr = (unsigned long)kmap_high(page);
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-	return (void *)vaddr;
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-}
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-
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-EXPORT_SYMBOL(kmap);
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-
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-void kunmap(struct page *page)
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-{
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-	BUG_ON(in_interrupt());
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-	if (!PageHighMem(page))
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-		return;
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-	kunmap_high(page);
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-}
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-
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-EXPORT_SYMBOL(kunmap);
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-
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-void *kmap_atomic(struct page *page)
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+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
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 {
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 	unsigned int idx;
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 	unsigned long vaddr, pte;
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 	int type;
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 	pte_t *ptep;
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-	preempt_disable();
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-	pagefault_disable();
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-	if (!PageHighMem(page))
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-		return page_address(page);
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-
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 	type = kmap_atomic_idx_push();
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 	idx = type + KM_TYPE_NR * smp_processor_id();
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 	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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-	pte = (page_to_pfn(page) << PAGE_SHIFT) | (PAGE_KERNEL);
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+	pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
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 	ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
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 	set_pte(ptep, pte);
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..
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@@ -58,10 +31,9 @@
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 	__nds32__isb();
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 	return (void *)vaddr;
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 }
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+EXPORT_SYMBOL(kmap_atomic_high_prot);
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35
 
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-EXPORT_SYMBOL(kmap_atomic);
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-
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-void __kunmap_atomic(void *kvaddr)
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+void kunmap_atomic_high(void *kvaddr)
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 {
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 	if (kvaddr >= (void *)FIXADDR_START) {
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 		unsigned long vaddr = (unsigned long)kvaddr;
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@@ -72,8 +44,5 @@
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 		ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
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 		set_pte(ptep, 0);
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 	}
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-	pagefault_enable();
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-	preempt_enable();
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 }
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-
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-EXPORT_SYMBOL(__kunmap_atomic);
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+EXPORT_SYMBOL(kunmap_atomic_high);