/* SPDX-License-Identifier: GPL-2.0 */ /* * highmem.h: virtual kernel memory mappings for high memory * * Used in CONFIG_HIGHMEM systems for memory pages which * are not addressable by direct kernel virtual addresses. * * Copyright (C) 1999 Gerhard Wichert, Siemens AG * Gerhard.Wichert@pdb.siemens.de * * * Redesigned the x86 32-bit VM architecture to deal with * up to 16 Terabyte physical memory. With current x86 CPUs * we now support up to 64 Gigabytes physical RAM. * * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> */ #ifndef _ASM_X86_HIGHMEM_H #define _ASM_X86_HIGHMEM_H #ifdef __KERNEL__ #include <linux/interrupt.h> #include <linux/threads.h> #include <asm/kmap_types.h> #include <asm/tlbflush.h> #include <asm/paravirt.h> #include <asm/fixmap.h> /* declarations for highmem.c */ extern unsigned long highstart_pfn, highend_pfn; /* * Right now we initialize only a single pte table. It can be extended * easily, subsequent pte tables have to be allocated in one physical * chunk of RAM. */ /* * Ordering is: * * high memory on: high_memory off: * FIXADDR_TOP FIXADDR_TOP * fixed addresses fixed addresses * FIXADDR_START FIXADDR_START * temp fixed addresses/persistent kmap area VMALLOC_END * PKMAP_BASE temp fixed addresses/vmalloc area * VMALLOC_END VMALLOC_START * vmalloc area high_memory * VMALLOC_START * high_memory * * The temp fixed area is only used during boot for early_ioremap(), and * it is unused when the ioremap() is functional. vmalloc/pkmap area become * available after early boot so the temp fixed area is available for re-use. */ #define LAST_PKMAP_MASK (LAST_PKMAP-1) #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); void *kmap(struct page *page); void kunmap(struct page *page); void *kmap_atomic_prot(struct page *page, pgprot_t prot); void *kmap_atomic(struct page *page); void __kunmap_atomic(void *kvaddr); void *kmap_atomic_pfn(unsigned long pfn); void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); #define flush_cache_kmaps() do { } while (0) extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn, unsigned long end_pfn); #endif /* __KERNEL__ */ #endif /* _ASM_X86_HIGHMEM_H */Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 89 | 50.57% | 5 | 23.81% |
| Yinghai Lu | 16 | 9.09% | 1 | 4.76% |
| Jeremy Fitzhardinge | 16 | 9.09% | 1 | 4.76% |
| Andrew Morton | 12 | 6.82% | 3 | 14.29% |
| Akinobu Mita | 12 | 6.82% | 1 | 4.76% |
| Harvey Harrison | 10 | 5.68% | 1 | 4.76% |
| Vivek Goyal | 9 | 5.11% | 1 | 4.76% |
| H. Peter Anvin | 3 | 1.70% | 1 | 4.76% |
| Keith Packard | 3 | 1.70% | 1 | 4.76% |
| Peter Zijlstra | 1 | 0.57% | 1 | 4.76% |
| Linus Torvalds | 1 | 0.57% | 1 | 4.76% |
| Américo Wang | 1 | 0.57% | 1 | 4.76% |
| Greg Kroah-Hartman | 1 | 0.57% | 1 | 4.76% |
| Minfei Huang | 1 | 0.57% | 1 | 4.76% |
| Joe Perches | 1 | 0.57% | 1 | 4.76% |
| Total | 176 | 100.00% | 21 | 100.00% |