source: trunk/hal/x86_64/core/hal_context.c @ 234

Last change on this file since 234 was 234, checked in by max@…, 5 years ago

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1/*
2 * hal_context.c - Implementation of Thread Context API for x86_64
3 *
4 * Copyright (c) 2017 Maxime Villard
5 *
6 * This file is part of ALMOS-MKH.
7 *
8 * ALMOS-MKH is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2.0 of the License.
11 *
12 * ALMOS-MKH is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <hal_types.h>
23#include <memcpy.h>
24#include <thread.h>
25#include <string.h>
26#include <process.h>
27#include <printk.h>
28#include <vmm.h>
29#include <core.h>
30#include <cluster.h>
31
32#include <hal_context.h>
33#include <hal_kentry.h>
34#include <hal_internal.h>
35#include <hal_segmentation.h>
36
37error_t hal_cpu_context_create(struct thread_s *thread)
38{
39        hal_cpu_context_t *context;
40        kmem_req_t req;
41
42        /* allocate memory for cpu_context */
43        req.type  = KMEM_CPU_CTX;
44        req.size  = sizeof(hal_cpu_context_t);
45        req.flags = AF_KERNEL | AF_ZERO;
46
47        context = (hal_cpu_context_t *)kmem_alloc(&req);
48        if (context == NULL)
49                return ENOMEM;
50
51        /* set cpu context pointer in thread */
52        thread->cpu_context = (void *)context;
53
54        /* build the context */
55        /* tf_gs */
56        /* tf_fs */
57        context->tf_es = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
58        context->tf_ds = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
59        context->tf_rip = (uint64_t)thread->entry_func;
60        context->tf_rflags = PSL_USERSET;
61
62        if (thread->type == THREAD_USER) {
63                context->tf_cs = GDT_FIXED_SEL(GDT_UCODE_SEL, SEL_UPL);
64                context->tf_rsp = ((uint64_t)thread->u_stack_base) +
65                    thread->u_stack_size;
66        } else {
67                context->tf_cs = GDT_FIXED_SEL(GDT_KCODE_SEL, SEL_KPL);
68                context->tf_rsp = ((uint64_t)thread->k_stack_base) +
69                    thread->k_stack_size;
70        }
71
72        return 0;
73}
74
75error_t hal_cpu_context_copy( thread_t * dst,
76                              thread_t * src )
77{
78        x86_panic((char *)__func__);
79        return 0;
80}
81
82void hal_cpu_context_destroy( thread_t * thread )
83{
84        x86_panic((char *)__func__);
85}
86
87error_t hal_fpu_context_create( thread_t * thread )
88{
89        x86_panic((char *)__func__);
90        return 0;
91}
92
93error_t hal_fpu_context_copy( thread_t * dst,
94                              thread_t * src )
95{
96        x86_panic((char *)__func__);
97        return 0;
98}
99
100void hal_fpu_context_destroy( thread_t * thread )
101{
102        x86_panic((char *)__func__);
103}
104
105void hal_cpu_context_save( thread_t * thread )
106{
107        x86_panic((char *)__func__);
108}
109
110void hal_cpu_context_restore( thread_t * thread )
111{
112        x86_panic((char *)__func__);
113}
114
115void hal_cpu_context_load( thread_t * thread )
116{
117        x86_panic((char *)__func__);
118}
119
120void hal_fpu_context_save( thread_t * thread )
121{
122        x86_panic((char *)__func__);
123}
124
125void hal_fpu_context_restore( thread_t * thread )
126{
127        x86_panic((char *)__func__);
128}
129
130void hal_fpu_context_dup( xptr_t dst,
131                          xptr_t src )
132{
133        x86_panic((char *)__func__);
134}
135
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