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2c419bde KG |
1 | /* |
2 | * fixmap.h: compile-time virtual memory allocation | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 1998 Ingo Molnar | |
9 | * | |
10 | * Copyright 2008 Freescale Semiconductor Inc. | |
11 | * Port to powerpc added by Kumar Gala | |
12 | */ | |
13 | ||
14 | #ifndef _ASM_FIXMAP_H | |
15 | #define _ASM_FIXMAP_H | |
16 | ||
2c419bde KG |
17 | #ifndef __ASSEMBLY__ |
18 | #include <linux/kernel.h> | |
19 | #include <asm/page.h> | |
20 | #ifdef CONFIG_HIGHMEM | |
21 | #include <linux/threads.h> | |
22 | #include <asm/kmap_types.h> | |
23 | #endif | |
24 | ||
f637a49e BH |
25 | #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) |
26 | ||
2c419bde KG |
27 | /* |
28 | * Here we define all the compile-time 'special' virtual | |
29 | * addresses. The point is to have a constant address at | |
30 | * compile time, but to set the physical address only | |
31 | * in the boot process. We allocate these special addresses | |
32 | * from the end of virtual memory (0xfffff000) backwards. | |
33 | * Also this lets us do fail-safe vmalloc(), we | |
34 | * can guarantee that these special addresses and | |
35 | * vmalloc()-ed addresses never overlap. | |
36 | * | |
37 | * these 'compile-time allocated' memory buffers are | |
38 | * fixed-size 4k pages. (or larger if used with an increment | |
39 | * highger than 1) use fixmap_set(idx,phys) to associate | |
40 | * physical memory with fixmap indices. | |
41 | * | |
42 | * TLB entries of such buffers will not be flushed across | |
43 | * task switches. | |
44 | */ | |
45 | enum fixed_addresses { | |
46 | FIX_HOLE, | |
b8e8efaa AH |
47 | /* reserve the top 128K for early debugging purposes */ |
48 | FIX_EARLY_DEBUG_TOP = FIX_HOLE, | |
49 | FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1, | |
2c419bde KG |
50 | #ifdef CONFIG_HIGHMEM |
51 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
52 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
f86ef74e CL |
53 | #endif |
54 | #ifdef CONFIG_PPC_8xx | |
55 | /* For IMMR we need an aligned 512K area */ | |
56 | #define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE) | |
57 | FIX_IMMR_START, | |
58 | FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + | |
59 | FIX_IMMR_SIZE, | |
2c419bde KG |
60 | #endif |
61 | /* FIX_PCIE_MCFG, */ | |
62 | __end_of_fixed_addresses | |
63 | }; | |
64 | ||
65 | extern void __set_fixmap (enum fixed_addresses idx, | |
66 | phys_addr_t phys, pgprot_t flags); | |
67 | ||
2c419bde KG |
68 | #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) |
69 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) | |
70 | ||
9494a1e8 | 71 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG |
2c419bde | 72 | |
9494a1e8 | 73 | #include <asm-generic/fixmap.h> |
2c419bde KG |
74 | |
75 | #endif /* !__ASSEMBLY__ */ | |
76 | #endif |