/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __UM_FIXMAP_H #define __UM_FIXMAP_H #include <asm/processor.h> #include <asm/kmap_types.h> #include <asm/archparam.h> #include <asm/page.h> #include <linux/threads.h> /* * Here we define all the compile-time 'special' virtual * addresses. The point is to have a constant address at * compile time, but to set the physical address only * in the boot process. We allocate these special addresses * from the end of virtual memory (0xfffff000) backwards. * Also this lets us do fail-safe vmalloc(), we * can guarantee that these special addresses and * vmalloc()-ed addresses never overlap. * * these 'compile-time allocated' memory buffers are * fixed-size 4k pages. (or larger if used with an increment * highger than 1) use fixmap_set(idx,phys) to associate * physical memory with fixmap indices. * * TLB entries of such buffers will not be flushed across * task switches. */ /* * on UP currently we will have no trace of the fixmap mechanizm, * no page table allocations, etc. This might change in the * future, say framebuffers for the console driver(s) could be * fix-mapped? */ enum fixed_addresses { __end_of_fixed_addresses }; extern void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags); /* * used by vmalloc.c. * * Leave one empty page between vmalloc'ed areas and * the start of the fixmap, and leave one page empty * at the top of mem.. */ #define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE) #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) #include <asm-generic/fixmap.h> #endif
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Kbuild | File | 702 B | 0644 |
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a.out-core.h | File | 695 B | 0644 |
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bugs.h | File | 111 B | 0644 |
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cache.h | File | 483 B | 0644 |
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common.lds.S | File | 1.76 KB | 0644 |
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dma.h | File | 180 B | 0644 |
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fixmap.h | File | 1.63 KB | 0644 |
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hardirq.h | File | 558 B | 0644 |
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io.h | File | 339 B | 0644 |
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irq.h | File | 493 B | 0644 |
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irqflags.h | File | 865 B | 0644 |
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kmap_types.h | File | 219 B | 0644 |
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kvm_para.h | File | 34 B | 0644 |
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mmu.h | File | 558 B | 0644 |
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mmu_context.h | File | 1.87 KB | 0644 |
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page.h | File | 3.15 KB | 0644 |
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pgalloc.h | File | 1.46 KB | 0644 |
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pgtable-2level.h | File | 1.32 KB | 0644 |
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pgtable-3level.h | File | 2.88 KB | 0644 |
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pgtable.h | File | 9.88 KB | 0644 |
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processor-generic.h | File | 1.87 KB | 0644 |
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ptrace-generic.h | File | 1.13 KB | 0644 |
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sections.h | File | 219 B | 0644 |
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setup.h | File | 273 B | 0644 |
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smp.h | File | 121 B | 0644 |
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stacktrace.h | File | 1.06 KB | 0644 |
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syscall-generic.h | File | 2.67 KB | 0644 |
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sysrq.h | File | 182 B | 0644 |
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thread_info.h | File | 2.15 KB | 0644 |
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timex.h | File | 151 B | 0644 |
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tlb.h | File | 4.23 KB | 0644 |
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tlbflush.h | File | 978 B | 0644 |
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uaccess.h | File | 1.65 KB | 0644 |
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unwind.h | File | 213 B | 0644 |
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