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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <userspace.h> |
29 | #include <userspace.h> |
30 | #include <arch/pm.h> |
30 | #include <arch/pm.h> |
31 | #include <arch/types.h> |
31 | #include <arch/types.h> |
32 | #include <arch.h> |
32 | #include <arch.h> |
33 | #include <proc/thread.h> |
33 | #include <proc/thread.h> |
34 | #include <mm/vm.h> |
34 | #include <mm/vm.h> |
35 | 35 | ||
36 | void userspace(void) |
36 | void userspace(void) |
37 | { |
37 | { |
38 | pri_t pri; |
38 | pri_t pri; |
39 | 39 | ||
40 | pri = cpu_priority_high(); |
40 | pri = cpu_priority_high(); |
41 | 41 | ||
42 | /* |
- | |
43 | * Prepare TSS stack selector and pointers for next syscall. |
- | |
44 | */ |
- | |
45 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-8]; |
- | |
46 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
- | |
47 | - | ||
48 | __asm__ volatile ("" |
42 | __asm__ volatile ("" |
49 | "pushl %0\n" |
43 | "pushl %0\n" |
50 | "pushl %1\n" |
44 | "pushl %1\n" |
51 | "pushl %2\n" |
45 | "pushl %2\n" |
52 | "pushl %3\n" |
46 | "pushl %3\n" |
53 | "pushl %4\n" |
47 | "pushl %4\n" |
54 | "iret" |
48 | "iret" |
55 | : : "i" (selector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+THREAD_STACK_SIZE-1000), "r" (pri), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS)); |
49 | : : "i" (selector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+THREAD_STACK_SIZE-1000), "r" (pri), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS)); |
56 | /* NOT REACHED */ |
50 | /* NOT REACHED */ |
57 | 51 | ||
58 | for(;;); |
52 | for(;;); |
59 | } |
53 | } |
60 | 54 |