x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
[pandora-kernel.git] / arch / x86 / include / asm / setup.h
1 #ifndef _ASM_X86_SETUP_H
2 #define _ASM_X86_SETUP_H
3
4 #ifdef __KERNEL__
5
6 #define COMMAND_LINE_SIZE 2048
7
8 #ifdef __i386__
9
10 #include <linux/pfn.h>
11 /*
12  * Reserved space for vmalloc and iomap - defined in asm/page.h
13  */
14 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
15 #define MAX_NONPAE_PFN  (1 << 20)
16
17 #endif /* __i386__ */
18
19 #define PARAM_SIZE 4096         /* sizeof(struct boot_params) */
20
21 #define OLD_CL_MAGIC            0xA33F
22 #define OLD_CL_ADDRESS          0x020   /* Relative to real mode data */
23 #define NEW_CL_POINTER          0x228   /* Relative to real mode data */
24
25 #ifndef __ASSEMBLY__
26 #include <asm/bootparam.h>
27 #include <asm/x86_init.h>
28
29 /* Interrupt control for vSMPowered x86_64 systems */
30 #ifdef CONFIG_X86_64
31 void vsmp_init(void);
32 #else
33 static inline void vsmp_init(void) { }
34 #endif
35
36 void setup_bios_corruption_check(void);
37
38 #ifdef CONFIG_X86_VISWS
39 extern void visws_early_detect(void);
40 #else
41 static inline void visws_early_detect(void) { }
42 #endif
43
44 extern unsigned long saved_video_mode;
45
46 extern void reserve_standard_io_resources(void);
47 extern void i386_reserve_resources(void);
48 extern void setup_default_timer_irq(void);
49
50 #ifdef CONFIG_X86_MRST
51 extern void x86_mrst_early_setup(void);
52 #else
53 static inline void x86_mrst_early_setup(void) { }
54 #endif
55
56 #ifdef CONFIG_X86_INTEL_CE
57 extern void x86_ce4100_early_setup(void);
58 #else
59 static inline void x86_ce4100_early_setup(void) { }
60 #endif
61
62 extern void init_espfix_bsp(void);
63 extern void init_espfix_ap(void);
64
65 #ifndef _SETUP
66
67 /*
68  * This is set up by the setup-routine at boot-time
69  */
70 extern struct boot_params boot_params;
71
72 /*
73  * Do NOT EVER look at the BIOS memory size location.
74  * It does not work on many machines.
75  */
76 #define LOWMEMSIZE()    (0x9f000)
77
78 /* exceedingly early brk-like allocator */
79 extern unsigned long _brk_end;
80 void *extend_brk(size_t size, size_t align);
81
82 /*
83  * Reserve space in the brk section.  The name must be unique within
84  * the file, and somewhat descriptive.  The size is in bytes.  Must be
85  * used at file scope.
86  *
87  * (This uses a temp function to wrap the asm so we can pass it the
88  * size parameter; otherwise we wouldn't be able to.  We can't use a
89  * "section" attribute on a normal variable because it always ends up
90  * being @progbits, which ends up allocating space in the vmlinux
91  * executable.)
92  */
93 #define RESERVE_BRK(name,sz)                                            \
94         static void __section(.discard.text) __used notrace             \
95         __brk_reservation_fn_##name##__(void) {                         \
96                 asm volatile (                                          \
97                         ".pushsection .brk_reservation,\"aw\",@nobits;" \
98                         ".brk." #name ":"                               \
99                         " 1:.skip %c0;"                                 \
100                         " .size .brk." #name ", . - 1b;"                \
101                         " .popsection"                                  \
102                         : : "i" (sz));                                  \
103         }
104
105 /* Helper for reserving space for arrays of things */
106 #define RESERVE_BRK_ARRAY(type, name, entries)          \
107         type *name;                                     \
108         RESERVE_BRK(name, sizeof(type) * entries)
109
110 extern void probe_roms(void);
111 #ifdef __i386__
112
113 void __init i386_start_kernel(void);
114
115 #else
116 void __init x86_64_start_kernel(char *real_mode);
117 void __init x86_64_start_reservations(char *real_mode_data);
118
119 #endif /* __i386__ */
120 #endif /* _SETUP */
121 #else
122 #define RESERVE_BRK(name,sz)                            \
123         .pushsection .brk_reservation,"aw",@nobits;     \
124 .brk.name:                                              \
125 1:      .skip sz;                                       \
126         .size .brk.name,.-1b;                           \
127         .popsection
128 #endif /* __ASSEMBLY__ */
129 #endif  /*  __KERNEL__  */
130
131 #endif /* _ASM_X86_SETUP_H */