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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/as.h> |
34 | #include <mm/as.h> |
35 | 35 | ||
36 | 36 | ||
37 | /** Enter userspace |
37 | /** Enter userspace |
38 | * |
38 | * |
39 | * Change CPU protection level to 3, enter userspace. |
39 | * Change CPU protection level to 3, enter userspace. |
40 | * |
40 | * |
41 | */ |
41 | */ |
42 | void userspace(void) |
42 | void userspace(__address entry) |
43 | { |
43 | { |
44 | ipl_t ipl; |
44 | ipl_t ipl; |
45 | 45 | ||
46 | ipl = interrupts_disable(); |
46 | ipl = interrupts_disable(); |
47 | 47 | ||
48 | __asm__ volatile ( |
48 | __asm__ volatile ( |
49 | /* CLNT */ |
49 | /* CLNT */ |
50 | "pushfl\n" |
50 | "pushfl\n" |
51 | "pop %%eax\n" |
51 | "pop %%eax\n" |
52 | "and $0xffffbfff,%%eax\n" |
52 | "and $0xffffbfff,%%eax\n" |
53 | "push %%eax\n" |
53 | "push %%eax\n" |
54 | "popfl\n" |
54 | "popfl\n" |
55 | 55 | ||
56 | "pushl %0\n" |
56 | "pushl %0\n" |
57 | "pushl %1\n" |
57 | "pushl %1\n" |
58 | "pushl %2\n" |
58 | "pushl %2\n" |
59 | "pushl %3\n" |
59 | "pushl %3\n" |
60 | "pushl %4\n" |
60 | "pushl %4\n" |
61 | "iret" |
61 | "iret" |
62 | : |
62 | : |
63 | : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS) |
63 | : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (entry) |
64 | : "eax"); |
64 | : "eax"); |
65 | 65 | ||
66 | /* Unreachable */ |
66 | /* Unreachable */ |
67 | for(;;) |
67 | for(;;) |
68 | ; |
68 | ; |
69 | } |
69 | } |
70 | 70 |