L4Re – L4 Runtime Environment
segment.h
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1 
6 /*
7  * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>
8  * economic rights: Technische Universität Dresden (Germany)
9  *
10  * This file is part of TUD:OS and distributed under the terms of the
11  * GNU General Public License 2.
12  * Please see the COPYING-GPL-2 file for details.
13  *
14  * As a special exception, you may use this file as part of a free software
15  * library without restriction. Specifically, if other files instantiate
16  * templates or use macros or inline functions from this file, or you compile
17  * this file and link it with other files to produce an executable, this
18  * file does not by itself cause the resulting executable to be covered by
19  * the GNU General Public License. This exception does not however
20  * invalidate any other reasons why the executable file might be covered by
21  * the GNU General Public License.
22  */
23 /*****************************************************************************/
24 #ifndef __L4_SYS__ARCH_X86__SEGMENT_H__
25 #define __L4_SYS__ARCH_X86__SEGMENT_H__
26 
27 #ifndef L4API_l4f
28 #error This header file can only be used with a L4API version!
29 #endif
30 
31 #include <l4/sys/ipc.h>
32 
43 L4_INLINE long
44 fiasco_ldt_set(l4_cap_idx_t task, void *ldt, unsigned int num_desc,
45  unsigned int entry_number_start, l4_utcb_t *utcb);
46 
60 L4_INLINE long
61 fiasco_gdt_set(l4_cap_idx_t thread, void *desc, unsigned int size,
62  unsigned int entry_number_start, l4_utcb_t *utcb);
63 
70 L4_INLINE unsigned
72 
77 {
84 };
85 
101 L4_INLINE long
103 
108 {
113 };
114 
128 L4_INLINE long
130  l4_umword_t base, l4_utcb_t *utcb);
131 
141 L4_INLINE long
142 fiasco_amd64_segment_info(l4_cap_idx_t thread, unsigned *user_ds,
143  unsigned *user_cs, unsigned *user32_cs,
144  l4_utcb_t *utcb);
145 
146 /*****************************************************************************
147  *** Implementation
148  *****************************************************************************/
149 
150 #include <l4/sys/task.h>
151 #include <l4/sys/thread.h>
152 
153 L4_INLINE long
154 fiasco_ldt_set(l4_cap_idx_t task, void *ldt, unsigned int num_desc,
155  unsigned int entry_number_start, l4_utcb_t *utcb)
156 {
157  if (num_desc > L4_TASK_LDT_X86_MAX_ENTRIES)
158  return -L4_EINVAL;
159  l4_utcb_mr_u(utcb)->mr[0] = L4_TASK_LDT_SET_X86_OP;
160  l4_utcb_mr_u(utcb)->mr[1] = entry_number_start;
161  __builtin_memcpy(&l4_utcb_mr_u(utcb)->mr[2], ldt,
162  num_desc * L4_TASK_LDT_X86_ENTRY_SIZE);
163  return l4_error_u(l4_ipc_call(task, utcb, l4_msgtag(L4_PROTO_TASK, 2 + num_desc * 2, 0, 0), L4_IPC_NEVER), utcb);
164 }
165 
166 L4_INLINE unsigned
168 {
169  l4_utcb_mr_u(utcb)->mr[0] = L4_THREAD_X86_GDT_OP;
170  if (l4_error_u(l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 1, 0, 0), L4_IPC_NEVER), utcb))
171  return -1;
172  return l4_utcb_mr_u(utcb)->mr[0];
173 }
174 
175 L4_INLINE long
176 fiasco_amd64_segment_info(l4_cap_idx_t thread, unsigned *user_ds,
177  unsigned *user_cs, unsigned *user32_cs,
178  l4_utcb_t *utcb)
179 {
180  l4_msg_regs_t *m = l4_utcb_mr_u(utcb);
181  int r;
182 
184 
185  r = l4_error_u(l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 1, 0, 0),
186  L4_IPC_NEVER), utcb);
187  if (r < 0)
188  return r;
189 
190  *user_ds = m->mr[0];
191  *user_cs = m->mr[1];
192  *user32_cs = m->mr[2];
193 
194  return 0;
195 }
196 
197 #endif /* ! __L4_SYS__ARCH_X86__SEGMENT_H__ */
L4_sys_segment
Constants for identifying segments.
Definition: segment.h:108
@ L4_AMD64_SEGMENT_GS
Constant identifying the GS segment.
Definition: segment.h:112
@ L4_AMD64_SEGMENT_FS
Constant identifying the FS segment.
Definition: segment.h:110
L4_task_ldt_x86_consts
Contants for LDT handling.
Definition: segment.h:77
@ L4_TASK_LDT_X86_MAX_ENTRIES
Maximum number of LDT entries that can be written with one call.
Definition: segment.h:81
@ L4_TASK_LDT_X86_ENTRY_SIZE
Size of an LDT entry.
Definition: segment.h:79
long fiasco_amd64_segment_info(l4_cap_idx_t thread, unsigned *user_ds, unsigned *user_cs, unsigned *user32_cs, l4_utcb_t *utcb)
Get segment information.
Definition: segment.h:176
long fiasco_amd64_set_segment_base(l4_cap_idx_t thread, enum L4_sys_segment segr, l4_umword_t base, l4_utcb_t *utcb)
Set the base address for a segment.
Definition: segment.h:43
long fiasco_amd64_set_fs(l4_cap_idx_t thread, l4_umword_t base, l4_utcb_t *utcb)
Set the base address for the FS segment.
Definition: segment.h:35
#define L4_MWORD_BITS
Size of machine words in bits.
Definition: l4int.h:33
long fiasco_ldt_set(l4_cap_idx_t task, void *ldt, unsigned int num_desc, unsigned int entry_number_start, l4_utcb_t *utcb)
Set LDT segments descriptors.
Definition: segment.h:154
unsigned fiasco_gdt_get_entry_offset(l4_cap_idx_t thread, l4_utcb_t *utcb)
Return the offset of the entry in the GDT.
Definition: segment.h:167
long fiasco_gdt_set(l4_cap_idx_t thread, void *desc, unsigned int size, unsigned int entry_number_start, l4_utcb_t *utcb)
Set GDT segment descriptors.
Definition: segment.h:52
unsigned long l4_umword_t
Unsigned machine word.
Definition: l4int.h:51
unsigned long l4_cap_idx_t
L4 Capability selector Type.
Definition: types.h:342
@ L4_EINVAL
Invalid argument.
Definition: err.h:56
l4_msgtag_t l4_ipc_call(l4_cap_idx_t object, l4_utcb_t *utcb, l4_msgtag_t tag, l4_timeout_t timeout) L4_NOTHROW
Object call (usual invocation).
Definition: ipc.h:463
l4_msgtag_t l4_msgtag(long label, unsigned words, unsigned items, unsigned flags) L4_NOTHROW
Create a message tag from the specified values.
Definition: types.h:408
@ L4_PROTO_TASK
Protocol for messages to a task object.
Definition: types.h:63
@ L4_PROTO_THREAD
Protocol for messages to a thread object.
Definition: types.h:64
@ L4_TASK_LDT_SET_X86_OP
x86: LDT set
Definition: task.h:260
@ L4_THREAD_AMD64_GET_SEGMENT_INFO_OP
Get segment information.
Definition: thread.h:635
@ L4_THREAD_X86_GDT_OP
Gdt.
Definition: thread.h:632
@ L4_UTCB_GENERIC_DATA_SIZE
Total number of message register (MRs) available.
Definition: utcb.h:47
struct l4_utcb_t l4_utcb_t
Opaque type for the UTCB.
Definition: utcb.h:67
Encapsulation of the message-register block in the UTCB.
Definition: utcb.h:79
l4_umword_t mr[L4_UTCB_GENERIC_DATA_SIZE]
Message registers.
Definition: utcb.h:80