/* * fixmap.h: compile-time virtual memory allocation * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998 Ingo Molnar * * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 */ #ifndef _ASM_FIXMAP_H #define _ASM_FIXMAP_H #include <asm/pgtable.h> #ifdef CONFIG_HIGHMEM #include <linux/threads.h> #include <asm/kmap_types.h> #endif /* * 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 start of the consistent memory region upwards. * 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 * higher than 1) use fixmap_set(idx,phys) to associate * physical memory with fixmap indices. */ enum fixed_addresses { #ifdef CONFIG_HIGHMEM /* reserved pte's for temporary kernel mappings */ FIX_KMAP_BEGIN, FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS * DCACHE_N_COLORS) - 1, #endif __end_of_fixed_addresses }; #define FIXADDR_TOP (VMALLOC_START - PAGE_SIZE) #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START ((FIXADDR_TOP - FIXADDR_SIZE) & PMD_MASK) #define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) #define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT) #ifndef __ASSEMBLY__ /* * 'index to address' translation. If anyone tries to use the idx * directly without translation, we catch the bug with a NULL-deference * kernel oops. Illegal ranges of incoming indices are caught too. */ static __always_inline unsigned long fix_to_virt(const unsigned int idx) { /* Check if this memory layout is broken because fixmap overlaps page * table. */ BUILD_BUG_ON(FIXADDR_START < XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE); BUILD_BUG_ON(idx >= __end_of_fixed_addresses); return __fix_to_virt(idx); } static inline unsigned long virt_to_fix(const unsigned long vaddr) { BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); return __virt_to_fix(vaddr); } #endif #define kmap_get_fixmap_pte(vaddr) \ pte_offset_kernel( \ pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \ (vaddr) \ ) #endif
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
Kbuild | File | 685 B | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
asm-uaccess.h | File | 4.11 KB | 0644 |
|
asmmacro.h | File | 2.76 KB | 0644 |
|
atomic.h | File | 7.38 KB | 0644 |
|
barrier.h | File | 542 B | 0644 |
|
bitops.h | File | 5.08 KB | 0644 |
|
bootparam.h | File | 1.37 KB | 0644 |
|
bugs.h | File | 451 B | 0644 |
|
cache.h | File | 969 B | 0644 |
|
cacheasm.h | File | 3.77 KB | 0644 |
|
cacheflush.h | File | 5.76 KB | 0644 |
|
checksum.h | File | 6 KB | 0644 |
|
cmpxchg.h | File | 3.9 KB | 0644 |
|
coprocessor.h | File | 5.05 KB | 0644 |
|
current.h | File | 675 B | 0644 |
|
delay.h | File | 1.63 KB | 0644 |
|
dma-mapping.h | File | 855 B | 0644 |
|
dma.h | File | 1.79 KB | 0644 |
|
elf.h | File | 5.75 KB | 0644 |
|
fixmap.h | File | 2.5 KB | 0644 |
|
flat.h | File | 686 B | 0644 |
|
ftrace.h | File | 979 B | 0644 |
|
futex.h | File | 2.59 KB | 0644 |
|
highmem.h | File | 2.33 KB | 0644 |
|
hw_breakpoint.h | File | 1.45 KB | 0644 |
|
hw_irq.h | File | 320 B | 0644 |
|
initialize_mmu.h | File | 4.58 KB | 0644 |
|
io.h | File | 2.09 KB | 0644 |
|
irq.h | File | 1.46 KB | 0644 |
|
irqflags.h | File | 1.99 KB | 0644 |
|
kmem_layout.h | File | 2.07 KB | 0644 |
|
mmu.h | File | 462 B | 0644 |
|
mmu_context.h | File | 3.62 KB | 0644 |
|
module.h | File | 525 B | 0644 |
|
mxregs.h | File | 1.3 KB | 0644 |
|
nommu_context.h | File | 602 B | 0644 |
|
page.h | File | 5.69 KB | 0644 |
|
pci-bridge.h | File | 2.16 KB | 0644 |
|
pci.h | File | 1.37 KB | 0644 |
|
perf_event.h | File | 108 B | 0644 |
|
pgalloc.h | File | 1.84 KB | 0644 |
|
pgtable.h | File | 14.89 KB | 0644 |
|
platform.h | File | 1.75 KB | 0644 |
|
processor.h | File | 7.44 KB | 0644 |
|
ptrace.h | File | 3.74 KB | 0644 |
|
regs.h | File | 3.87 KB | 0644 |
|
segment.h | File | 376 B | 0644 |
|
serial.h | File | 443 B | 0644 |
|
shmparam.h | File | 561 B | 0644 |
|
signal.h | File | 502 B | 0644 |
|
smp.h | File | 967 B | 0644 |
|
spinlock.h | File | 4.6 KB | 0644 |
|
spinlock_types.h | File | 412 B | 0644 |
|
stacktrace.h | File | 1.13 KB | 0644 |
|
string.h | File | 2.65 KB | 0644 |
|
switch_to.h | File | 601 B | 0644 |
|
syscall.h | File | 982 B | 0644 |
|
sysmem.h | File | 426 B | 0644 |
|
thread_info.h | File | 3.62 KB | 0644 |
|
timex.h | File | 1.79 KB | 0644 |
|
tlb.h | File | 1.1 KB | 0644 |
|
tlbflush.h | File | 5.53 KB | 0644 |
|
traps.h | File | 1.87 KB | 0644 |
|
types.h | File | 501 B | 0644 |
|
uaccess.h | File | 8.67 KB | 0644 |
|
ucontext.h | File | 540 B | 0644 |
|
unaligned.h | File | 864 B | 0644 |
|
unistd.h | File | 639 B | 0644 |
|
user.h | File | 507 B | 0644 |
|
vectors.h | File | 4.05 KB | 0644 |
|
vga.h | File | 434 B | 0644 |
|