Subversion Repositories HelenOS

Rev

Rev 2128 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2128 jermar 1 
/*
2465 jermar 2 
 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
2128 jermar 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
2465 jermar 29 
/** @addtogroup libcarm32
2128 jermar 30 
 * @{
31 
 */
32 
/** @file
2465 jermar 33 
 *  @brief Uspace threads and TLS.
2128 jermar 34 
 */
35 
 
36 
#ifndef LIBC_arm32_THREAD_H_
37 
#define LIBC_arm32_THREAD_H_
38 
 
39 
#include <unistd.h>
40 
 
2465 jermar 41 
/** Stack initial size. */
2128 jermar 42 
#define THREAD_INITIAL_STACK_PAGES_NO 1
43 
 
2465 jermar 44 
/** Offsets for accessing __thread variables are shifted 8 bytes higher. */
45 
#define ARM_TP_OFFSET   (-8)
46 
 
47 
/** TCB (Thread Control Block) struct.
48 
 *
49 
 *  TLS starts just after this struct.
50 
 */
2128 jermar 51 
typedef struct {
2465 jermar 52 
    /** psthread data. */
2128 jermar 53 
    void *pst_data;
54 
} tcb_t;
55 
 
2465 jermar 56 
 
57 
/** Sets TLS address to the r9 register.
58 
 *
59 
 *  @param tcb TCB (TLS starts behind)
60 
 */
2128 jermar 61 
static inline void __tcb_set(tcb_t *tcb)
62 
{
2465 jermar 63 
    void *tls = (void *)tcb;
64 
    tls += sizeof(tcb_t) + ARM_TP_OFFSET;
65 
    asm volatile (
66 
        "mov r9, %0"
67 
        :
68 
        : "r"(tls)
69 
    );
2128 jermar 70 
}
71 
 
2465 jermar 72 
 
73 
/** Returns TCB address.
74 
 *
75 
 * @return TCB address (starts before TLS which address is stored in r9 register).
76 
 */
2128 jermar 77 
static inline tcb_t *__tcb_get(void)
78 
{
2465 jermar 79 
    void *ret;
80 
    asm volatile (
81 
        "mov %0, r9"
82 
        : "=r"(ret)
83 
    );
84 
    return (tcb_t *)(ret - ARM_TP_OFFSET - sizeof(tcb_t));
2128 jermar 85 
}
86 
 
2465 jermar 87 
 
88 
/** Returns TLS address stored.
89 
 *
90 
 *  Implemented in assembly.
91 
 *
92 
 *  @return TLS address stored in r9 register
93 
 */
94 
extern uintptr_t __aeabi_read_tp(void);
95 
 
2128 jermar 96 
#endif
97 
 
98 
/** @}
99 
 */