source: trunk/hal/x86_64/core/hal_context.c @ 335

Last change on this file since 335 was 335, checked in by max@…, 4 years ago

Separate the CPU context from the trap frame.

File size: 3.3 KB
Line 
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_trapframe_t *tf;
40        hal_cpu_context_t *ctx;
41        kmem_req_t req;
42
43        /* allocate memory for cpu_context */
44        req.type  = KMEM_CPU_CTX;
45        req.size  = sizeof(hal_cpu_context_t);
46        req.flags = AF_KERNEL | AF_ZERO;
47
48        ctx = (hal_cpu_context_t *)kmem_alloc(&req);
49        if (ctx == NULL)
50                return ENOMEM;
51
52        /* set cpu context pointer in thread */
53        thread->cpu_context = (void *)ctx;
54
55        /*
56         * Build the context
57         */
58        ctx->ctx_rsp0 = ((uint64_t)thread->k_stack_base) + thread->k_stack_size;
59        ctx->ctx_rsp0 &= ~0xF;
60        /* XXX: ctx_rsp */
61
62        /*
63         * Build the trap frame
64         */
65        tf = (void *)(((uint64_t)thread->k_stack_base +
66            thread->k_stack_size) & ~0xF);
67        tf->tf_gs = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
68        tf->tf_fs = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
69        tf->tf_es = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
70        tf->tf_ds = GDT_FIXED_SEL(GDT_UDATA_SEL, SEL_UPL);
71        tf->tf_rip = (uint64_t)thread->entry_func;
72        tf->tf_rflags = PSL_USERSET;
73
74        if (thread->type == THREAD_USER) {
75                tf->tf_cs = GDT_FIXED_SEL(GDT_UCODE_SEL, SEL_UPL);
76                tf->tf_rsp = ((uint64_t)thread->u_stack_base) +
77                    thread->u_stack_size;
78        } else {
79                tf->tf_cs = GDT_FIXED_SEL(GDT_KCODE_SEL, SEL_KPL);
80                tf->tf_rsp = ((uint64_t)thread->k_stack_base) +
81                    thread->k_stack_size;
82        }
83
84        return 0;
85}
86
87error_t hal_cpu_context_copy(thread_t *dst, thread_t *src)
88{
89        x86_panic((char *)__func__);
90        return 0;
91}
92
93void hal_cpu_context_destroy(thread_t *thread)
94{
95        x86_panic((char *)__func__);
96}
97
98void hal_cpu_context_switch(thread_t *old, thread_t *new)
99{
100        x86_panic((char *)__func__);
101}
102
103void hal_cpu_context_load( thread_t * thread )
104{
105        x86_panic((char *)__func__);
106}
107
108error_t hal_fpu_context_create( thread_t * thread )
109{
110        x86_panic((char *)__func__);
111        return 0;
112}
113
114error_t hal_fpu_context_copy( thread_t * dst,
115                              thread_t * src )
116{
117        x86_panic((char *)__func__);
118        return 0;
119}
120
121void hal_fpu_context_destroy( thread_t * thread )
122{
123        x86_panic((char *)__func__);
124}
125
126void hal_fpu_context_save( thread_t * thread )
127{
128        x86_panic((char *)__func__);
129}
130
131void hal_fpu_context_restore( thread_t * thread )
132{
133        x86_panic((char *)__func__);
134}
135
136void hal_fpu_context_dup( xptr_t dst,
137                          xptr_t src )
138{
139        x86_panic((char *)__func__);
140}
141
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