ia64/linux-2.6.18-xen.hg

view include/asm-m32r/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 #ifndef _ASM_M32R_THREAD_INFO_H
2 #define _ASM_M32R_THREAD_INFO_H
4 /* thread_info.h: m32r low-level thread information
5 *
6 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
9 */
11 #ifdef __KERNEL__
13 #ifndef __ASSEMBLY__
14 #include <asm/processor.h>
15 #endif
17 /*
18 * low level task data that entry.S needs immediate access to
19 * - this struct should fit entirely inside of one cache line
20 * - this struct shares the supervisor stack pages
21 * - if the contents of this structure are changed, the assembly constants must also be changed
22 */
23 #ifndef __ASSEMBLY__
25 struct thread_info {
26 struct task_struct *task; /* main task structure */
27 struct exec_domain *exec_domain; /* execution domain */
28 unsigned long flags; /* low level flags */
29 unsigned long status; /* thread-synchronous flags */
30 __u32 cpu; /* current CPU */
31 int preempt_count; /* 0 => preemptable, <0 => BUG */
33 mm_segment_t addr_limit; /* thread address space:
34 0-0xBFFFFFFF for user-thread
35 0-0xFFFFFFFF for kernel-thread
36 */
37 struct restart_block restart_block;
39 __u8 supervisor_stack[0];
40 };
42 #else /* !__ASSEMBLY__ */
44 /* offsets into the thread_info struct for assembly code access */
45 #define TI_TASK 0x00000000
46 #define TI_EXEC_DOMAIN 0x00000004
47 #define TI_FLAGS 0x00000008
48 #define TI_STATUS 0x0000000C
49 #define TI_CPU 0x00000010
50 #define TI_PRE_COUNT 0x00000014
51 #define TI_ADDR_LIMIT 0x00000018
52 #define TI_RESTART_BLOCK 0x000001C
54 #endif
56 #define PREEMPT_ACTIVE 0x10000000
58 /*
59 * macros/functions for gaining access to the thread information structure
60 *
61 * preempt_count needs to be 1 initially, until the scheduler is functional.
62 */
63 #ifndef __ASSEMBLY__
65 #define INIT_THREAD_INFO(tsk) \
66 { \
67 .task = &tsk, \
68 .exec_domain = &default_exec_domain, \
69 .flags = 0, \
70 .cpu = 0, \
71 .preempt_count = 1, \
72 .addr_limit = KERNEL_DS, \
73 .restart_block = { \
74 .fn = do_no_restart_syscall, \
75 }, \
76 }
78 #define init_thread_info (init_thread_union.thread_info)
79 #define init_stack (init_thread_union.stack)
81 #define THREAD_SIZE (2*PAGE_SIZE)
83 /* how to get the thread information struct from C */
84 static inline struct thread_info *current_thread_info(void)
85 {
86 struct thread_info *ti;
88 __asm__ __volatile__ (
89 "ldi %0, #%1 \n\t"
90 "and %0, sp \n\t"
91 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
92 );
94 return ti;
95 }
97 /* thread information allocation */
98 #ifdef CONFIG_DEBUG_STACK_USAGE
99 #define alloc_thread_info(tsk) \
100 ({ \
101 struct thread_info *ret; \
102 \
103 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
104 if (ret) \
105 memset(ret, 0, THREAD_SIZE); \
106 ret; \
107 })
108 #else
109 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
110 #endif
112 #define free_thread_info(info) kfree(info)
114 #define TI_FLAG_FAULT_CODE_SHIFT 28
116 static inline void set_thread_fault_code(unsigned int val)
117 {
118 struct thread_info *ti = current_thread_info();
119 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
120 | (val << TI_FLAG_FAULT_CODE_SHIFT);
121 }
123 static inline unsigned int get_thread_fault_code(void)
124 {
125 struct thread_info *ti = current_thread_info();
126 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
127 }
129 #else /* !__ASSEMBLY__ */
131 #define THREAD_SIZE 8192
133 /* how to get the thread information struct from ASM */
134 #define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
135 .macro GET_THREAD_INFO reg
136 ldi \reg, #-THREAD_SIZE
137 and \reg, sp
138 .endm
140 #endif
142 /*
143 * thread information flags
144 * - these are process state flags that various assembly files may need to access
145 * - pending work-to-be-done flags are in LSW
146 * - other flags in MSW
147 */
148 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
149 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
150 #define TIF_SIGPENDING 2 /* signal pending */
151 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
152 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
153 #define TIF_IRET 5 /* return with iret */
154 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
155 /* 31..28 fault code */
156 #define TIF_MEMDIE 17
158 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
159 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
160 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
161 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
162 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
163 #define _TIF_IRET (1<<TIF_IRET)
164 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
166 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
167 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
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) */
178 #endif /* __KERNEL__ */
180 #endif /* _ASM_M32R_THREAD_INFO_H */