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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 * License: see LICENSE.spdx (in this directory or the directories above)
11 */
12/*****************************************************************************/
13#ifndef __L4_SYS__ARCH_X86__SEGMENT_H__
14#define __L4_SYS__ARCH_X86__SEGMENT_H__
15
16#ifndef L4API_l4f
17#error This header file can only be used with a L4API version!
18#endif
19
20#include <l4/sys/ipc.h>
21
39L4_INLINE long
40fiasco_ldt_set(l4_cap_idx_t task, void *ldt, unsigned int num_desc,
41 unsigned int entry_number_start, l4_utcb_t *utcb);
42
59L4_INLINE long
60fiasco_gdt_set(l4_cap_idx_t thread, void *desc, unsigned int size,
61 unsigned int entry_number_start, l4_utcb_t *utcb);
62
69L4_INLINE unsigned
71
84
85/*****************************************************************************
86 *** Implementation
87 *****************************************************************************/
88
89#include <l4/sys/task.h>
90#include <l4/sys/thread.h>
91
92L4_INLINE long
93fiasco_ldt_set(l4_cap_idx_t task, void *ldt, unsigned int num_desc,
94 unsigned int entry_number_start, l4_utcb_t *utcb)
95{
96 if (num_desc > L4_TASK_LDT_X86_MAX_ENTRIES)
97 return -L4_EINVAL;
98 l4_utcb_mr_u(utcb)->mr[0] = L4_TASK_LDT_SET_X86_OP;
99 l4_utcb_mr_u(utcb)->mr[1] = entry_number_start;
100 __builtin_memcpy(&l4_utcb_mr_u(utcb)->mr[2], ldt,
101 num_desc * L4_TASK_LDT_X86_ENTRY_SIZE);
102 return l4_error_u(l4_ipc_call(task, utcb, l4_msgtag(L4_PROTO_TASK, 2 + num_desc * 2, 0, 0), L4_IPC_NEVER), utcb);
103}
104
105L4_INLINE unsigned
107{
108 l4_utcb_mr_u(utcb)->mr[0] = L4_THREAD_X86_GDT_OP;
109 if (l4_error_u(l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 1, 0, 0), L4_IPC_NEVER), utcb))
110 return -1;
111 return l4_utcb_mr_u(utcb)->mr[0];
112}
113
114#endif /* ! __L4_SYS__ARCH_X86__SEGMENT_H__ */
L4_task_ldt_x86_consts
Contants for LDT handling.
Definition segment.h:76
@ L4_TASK_LDT_X86_MAX_ENTRIES
Maximum number of LDT entries that can be written with one call.
Definition segment.h:80
@ L4_TASK_LDT_X86_ENTRY_SIZE
Size of an LDT entry.
Definition segment.h:78
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:153
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:166
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:41
#define L4_MWORD_BITS
Size of machine words in bits.
Definition l4int.h:22
unsigned long l4_cap_idx_t
Capability selector type.
Definition types.h:335
@ L4_EINVAL
Invalid argument.
Definition err.h:46
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:565
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:404
@ L4_PROTO_TASK
Protocol for messages to a task object.
Definition types.h:52
@ L4_PROTO_THREAD
Protocol for messages to a thread object.
Definition types.h:53
@ L4_TASK_LDT_SET_X86_OP
x86: LDT set
Definition task.h:330
@ L4_THREAD_X86_GDT_OP
Gdt.
Definition thread.h:721
#define L4_IPC_NEVER
never timeout
Definition __timeout.h:76
struct l4_utcb_t l4_utcb_t
Opaque type for the UTCB.
Definition utcb.h:56
#define L4_INLINE
L4 Inline function attribute.
Definition compiler.h:51
l4_umword_t mr[L4_UTCB_GENERIC_DATA_SIZE]
Message registers.
Definition utcb.h:69