fixmap.h (4fe2d8b11a370af286287a2661de9d4e6c9a145a) fixmap.h (ed1bbc40a0d10e0c5c74fe7bdc6298295cf40255)
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

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20#include <asm/apicdef.h>
21#include <asm/page.h>
22#ifdef CONFIG_X86_32
23#include <linux/threads.h>
24#include <asm/kmap_types.h>
25#else
26#include <uapi/asm/vsyscall.h>
27#endif
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

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20#include <asm/apicdef.h>
21#include <asm/page.h>
22#ifdef CONFIG_X86_32
23#include <linux/threads.h>
24#include <asm/kmap_types.h>
25#else
26#include <uapi/asm/vsyscall.h>
27#endif
28#include <asm/cpu_entry_area.h>
28
29/*
30 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
31 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
32 * Because of this, FIXADDR_TOP x86 integration was left as later work.
33 */
34#ifdef CONFIG_X86_32
35/* used by vmalloc.c, vsyscall.lds.S.

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40extern unsigned long __FIXADDR_TOP;
41#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
42#else
43#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
44 PAGE_SIZE)
45#endif
46
47/*
29
30/*
31 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
32 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
33 * Because of this, FIXADDR_TOP x86 integration was left as later work.
34 */
35#ifdef CONFIG_X86_32
36/* used by vmalloc.c, vsyscall.lds.S.

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41extern unsigned long __FIXADDR_TOP;
42#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
43#else
44#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
45 PAGE_SIZE)
46#endif
47
48/*
48 * cpu_entry_area is a percpu region in the fixmap that contains things
49 * needed by the CPU and early entry/exit code. Real types aren't used
50 * for all fields here to avoid circular header dependencies.
51 *
52 * Every field is a virtual alias of some other allocated backing store.
53 * There is no direct allocation of a struct cpu_entry_area.
54 */
55struct cpu_entry_area {
56 char gdt[PAGE_SIZE];
57
58 /*
59 * The GDT is just below entry_stack and thus serves (on x86_64) as
60 * a a read-only guard page.
61 */
62 struct entry_stack_page entry_stack_page;
63
64 /*
65 * On x86_64, the TSS is mapped RO. On x86_32, it's mapped RW because
66 * we need task switches to work, and task switches write to the TSS.
67 */
68 struct tss_struct tss;
69
70 char entry_trampoline[PAGE_SIZE];
71
72#ifdef CONFIG_X86_64
73 /*
74 * Exception stacks used for IST entries.
75 *
76 * In the future, this should have a separate slot for each stack
77 * with guard pages between them.
78 */
79 char exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ];
80#endif
81};
82
83#define CPU_ENTRY_AREA_PAGES (sizeof(struct cpu_entry_area) / PAGE_SIZE)
84
85extern void setup_cpu_entry_areas(void);
86
87/*
88 * Here we define all the compile-time 'special' virtual
89 * addresses. The point is to have a constant address at
90 * compile time, but to set the physical address only
91 * in the boot process.
92 * for x86_32: We allocate these special addresses
93 * from the end of virtual memory (0xfffff000) backwards.
94 * Also this lets us do fail-safe vmalloc(), we
95 * can guarantee that these special addresses and

--- 164 unchanged lines hidden --- 		49 * Here we define all the compile-time 'special' virtual
50 * addresses. The point is to have a constant address at
51 * compile time, but to set the physical address only
52 * in the boot process.
53 * for x86_32: We allocate these special addresses
54 * from the end of virtual memory (0xfffff000) backwards.
55 * Also this lets us do fail-safe vmalloc(), we
56 * can guarantee that these special addresses and

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