ia64/linux-2.6.18-xen.hg

view include/asm-i386/thread_info.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /* thread_info.h: i386 low-level thread information
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 */
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
10 #ifdef __KERNEL__
12 #include <linux/compiler.h>
13 #include <asm/page.h>
15 #ifndef __ASSEMBLY__
16 #include <asm/processor.h>
17 #endif
19 /*
20 * low level task data that entry.S needs immediate access to
21 * - this struct should fit entirely inside of one cache line
22 * - this struct shares the supervisor stack pages
23 * - if the contents of this structure are changed, the assembly constants must also be changed
24 */
25 #ifndef __ASSEMBLY__
27 struct thread_info {
28 struct task_struct *task; /* main task structure */
29 struct exec_domain *exec_domain; /* execution domain */
30 unsigned long flags; /* low level flags */
31 unsigned long status; /* thread-synchronous flags */
32 __u32 cpu; /* current CPU */
33 int preempt_count; /* 0 => preemptable, <0 => BUG */
36 mm_segment_t addr_limit; /* thread address space:
37 0-0xBFFFFFFF for user-thead
38 0-0xFFFFFFFF for kernel-thread
39 */
40 void *sysenter_return;
41 struct restart_block restart_block;
43 unsigned long previous_esp; /* ESP of the previous stack in case
44 of nested (IRQ) stacks
45 */
46 __u8 supervisor_stack[0];
47 };
49 #else /* !__ASSEMBLY__ */
51 #include <asm/asm-offsets.h>
53 #endif
55 #define PREEMPT_ACTIVE 0x10000000
56 #ifdef CONFIG_4KSTACKS
57 #define THREAD_SIZE (4096)
58 #else
59 #define THREAD_SIZE (8192)
60 #endif
62 #define STACK_WARN (THREAD_SIZE/8)
63 /*
64 * macros/functions for gaining access to the thread information structure
65 *
66 * preempt_count needs to be 1 initially, until the scheduler is functional.
67 */
68 #ifndef __ASSEMBLY__
70 #define INIT_THREAD_INFO(tsk) \
71 { \
72 .task = &tsk, \
73 .exec_domain = &default_exec_domain, \
74 .flags = 0, \
75 .cpu = 0, \
76 .preempt_count = 1, \
77 .addr_limit = KERNEL_DS, \
78 .restart_block = { \
79 .fn = do_no_restart_syscall, \
80 }, \
81 }
83 #define init_thread_info (init_thread_union.thread_info)
84 #define init_stack (init_thread_union.stack)
87 /* how to get the current stack pointer from C */
88 register unsigned long current_stack_pointer asm("esp") __attribute_used__;
90 /* how to get the thread information struct from C */
91 static inline struct thread_info *current_thread_info(void)
92 {
93 return (struct thread_info *)(current_stack_pointer & ~(THREAD_SIZE - 1));
94 }
96 /* thread information allocation */
97 #ifdef CONFIG_DEBUG_STACK_USAGE
98 #define alloc_thread_info(tsk) \
99 ({ \
100 struct thread_info *ret; \
101 \
102 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
103 if (ret) \
104 memset(ret, 0, THREAD_SIZE); \
105 ret; \
106 })
107 #else
108 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
109 #endif
111 #define free_thread_info(info) kfree(info)
113 #else /* !__ASSEMBLY__ */
115 /* how to get the thread information struct from ASM */
116 #define GET_THREAD_INFO(reg) \
117 movl $-THREAD_SIZE, reg; \
118 andl %esp, reg
120 /* use this one if reg already contains %esp */
121 #define GET_THREAD_INFO_WITH_ESP(reg) \
122 andl $-THREAD_SIZE, reg
124 #endif
126 /*
127 * thread information flags
128 * - these are process state flags that various assembly files may need to access
129 * - pending work-to-be-done flags are in LSW
130 * - other flags in MSW
131 */
132 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
133 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
134 #define TIF_SIGPENDING 2 /* signal pending */
135 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
136 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
137 #define TIF_IRET 5 /* return with iret */
138 #define TIF_SYSCALL_EMU 6 /* syscall emulation active */
139 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
140 #define TIF_SECCOMP 8 /* secure computing */
141 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
142 #define TIF_MEMDIE 16
143 #define TIF_DEBUG 17 /* uses debug registers */
144 #define TIF_IO_BITMAP 18 /* uses I/O bitmap */
146 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
147 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
148 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
149 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
150 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
151 #define _TIF_IRET (1<<TIF_IRET)
152 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
153 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
154 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
155 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
156 #define _TIF_DEBUG (1<<TIF_DEBUG)
157 #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
159 /* work to do on interrupt/exception return */
160 #define _TIF_WORK_MASK \
161 (0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
162 _TIF_SECCOMP | _TIF_SYSCALL_EMU))
163 /* work to do on any return to u-space */
164 #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
166 /* flags to check in __switch_to() */
167 #define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
169 /*
170 * Thread-synchronous status.
171 *
172 * This is different from the flags in that nobody else
173 * ever touches our thread-synchronous status, so we don't
174 * have to worry about atomic accesses.
175 */
176 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
177 #define TS_POLLING 0x0002 /* True if in idle loop and not sleeping */
179 #define tsk_is_polling(t) ((t)->thread_info->status & TS_POLLING)
181 #endif /* __KERNEL__ */
183 #endif /* _ASM_THREAD_INFO_H */