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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 | /** @addtogroup ia32 |
29 | /** @addtogroup ia32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <userspace.h> |
35 | #include <userspace.h> |
36 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
37 | #include <arch/types.h> |
37 | #include <arch/types.h> |
38 | #include <arch.h> |
38 | #include <arch.h> |
39 | #include <proc/uarg.h> |
39 | #include <proc/uarg.h> |
40 | #include <mm/as.h> |
40 | #include <mm/as.h> |
41 | 41 | ||
42 | 42 | ||
43 | /** Enter userspace |
43 | /** Enter userspace |
44 | * |
44 | * |
45 | * Change CPU protection level to 3, enter userspace. |
45 | * Change CPU protection level to 3, enter userspace. |
46 | * |
46 | * |
47 | */ |
47 | */ |
48 | void userspace(uspace_arg_t *kernel_uarg) |
48 | void userspace(uspace_arg_t *kernel_uarg) |
49 | { |
49 | { |
50 | ipl_t ipl = interrupts_disable(); |
50 | ipl_t ipl = interrupts_disable(); |
51 | 51 | ||
52 | asm volatile ( |
52 | asm volatile ( |
53 | /* |
53 | /* |
54 | * Clear nested task flag. |
54 | * Clear nested task flag. |
55 | */ |
55 | */ |
56 | "pushfl\n" |
56 | "pushfl\n" |
57 | "pop %%eax\n" |
57 | "pop %%eax\n" |
58 | "and $0xffffbfff, %%eax\n" |
58 | "and $0xffffbfff, %%eax\n" |
59 | "push %%eax\n" |
59 | "push %%eax\n" |
60 | "popfl\n" |
60 | "popfl\n" |
61 | 61 | ||
62 | /* Set up GS register (TLS) */ |
62 | /* Set up GS register (TLS) */ |
63 | "movl %[tls_des], %%gs\n" |
63 | "movl %[tls_des], %%gs\n" |
64 | 64 | ||
65 | "pushl %[udata_des]\n" |
65 | "pushl %[udata_des]\n" |
66 | "pushl %[stack_size]\n" |
66 | "pushl %[stack_size]\n" |
67 | "pushl %[ipl]\n" |
67 | "pushl %[ipl]\n" |
68 | "pushl %[utext_des]\n" |
68 | "pushl %[utext_des]\n" |
69 | "pushl %[entry]\n" |
69 | "pushl %[entry]\n" |
70 | "movl %[uarg], %%eax\n" |
70 | "movl %[uarg], %%eax\n" |
71 | 71 | ||
72 | /* %ebx is defined to hold pcb_ptr - set it to 0 */ |
72 | /* %ebx is defined to hold pcb_ptr - set it to 0 */ |
73 | "xorl %%ebx, %%ebx\n" |
73 | "xorl %%ebx, %%ebx\n" |
74 | 74 | ||
75 | "iret\n" |
75 | "iret\n" |
76 | : |
76 | : |
77 | : [udata_des] "i" (selector(UDATA_DES) | PL_USER), |
77 | : [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER), |
78 | [stack_size] "r" ((uint8_t *) kernel_uarg->uspace_stack + THREAD_STACK_SIZE), |
78 | [stack_size] "r" ((uint8_t *) kernel_uarg->uspace_stack + THREAD_STACK_SIZE), |
79 | [ipl] "r" (ipl), |
79 | [ipl] "r" (ipl), |
80 | [utext_des] "i" (selector(UTEXT_DES) | PL_USER), |
80 | [utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER), |
81 | [entry] "r" (kernel_uarg->uspace_entry), |
81 | [entry] "r" (kernel_uarg->uspace_entry), |
82 | [uarg] "r" (kernel_uarg->uspace_uarg), |
82 | [uarg] "r" (kernel_uarg->uspace_uarg), |
83 | [tls_des] "r" (selector(TLS_DES)) |
83 | [tls_des] "r" (gdtselector(TLS_DES)) |
84 | : "eax"); |
84 | : "eax"); |
85 | 85 | ||
86 | /* Unreachable */ |
86 | /* Unreachable */ |
87 | while (1); |
87 | while (1); |
88 | } |
88 | } |
89 | 89 | ||
90 | /** @} |
90 | /** @} |
91 | */ |
91 | */ |
92 | 92 |