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257 | palkovsky | 1 | /* |
2 | * Copyright (C) 2005 Ondrej Palkovsky |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1888 | jermar | 29 | /** @addtogroup amd64 |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
257 | palkovsky | 35 | #include <userspace.h> |
36 | #include <arch/pm.h> |
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37 | #include <arch/types.h> |
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38 | #include <arch.h> |
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1078 | jermar | 39 | #include <proc/uarg.h> |
703 | jermar | 40 | #include <mm/as.h> |
257 | palkovsky | 41 | |
42 | |||
43 | /** Enter userspace |
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44 | * |
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45 | * Change CPU protection level to 3, enter userspace. |
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46 | * |
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47 | */ |
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1078 | jermar | 48 | void userspace(uspace_arg_t *kernel_uarg) |
257 | palkovsky | 49 | { |
413 | jermar | 50 | ipl_t ipl; |
257 | palkovsky | 51 | |
413 | jermar | 52 | ipl = interrupts_disable(); |
257 | palkovsky | 53 | |
1102 | palkovsky | 54 | /* Clear CF,PF,AF,ZF,SF,DF,OF */ |
1119 | palkovsky | 55 | ipl &= ~(0xcd4); |
1102 | palkovsky | 56 | |
257 | palkovsky | 57 | __asm__ volatile ("" |
1066 | jermar | 58 | "pushq %0\n" |
59 | "pushq %1\n" |
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60 | "pushq %2\n" |
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61 | "pushq %3\n" |
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62 | "pushq %4\n" |
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1078 | jermar | 63 | "movq %5, %%rax\n" |
1066 | jermar | 64 | "iretq\n" |
65 | : : |
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66 | "i" (gdtselector(UDATA_DES) | PL_USER), |
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1078 | jermar | 67 | "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), |
802 | palkovsky | 68 | "r" (ipl), |
69 | "i" (gdtselector(UTEXT_DES) | PL_USER), |
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1078 | jermar | 70 | "r" (kernel_uarg->uspace_entry), |
71 | "r" (kernel_uarg->uspace_uarg) |
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72 | : "rax" |
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73 | ); |
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257 | palkovsky | 74 | |
75 | /* Unreachable */ |
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1078 | jermar | 76 | for(;;) |
77 | ; |
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257 | palkovsky | 78 | } |
1702 | cejka | 79 | |
1888 | jermar | 80 | /** @} |
1702 | cejka | 81 | */ |