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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
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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 | |||
| 29 | #include <userspace.h> |
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| 30 | #include <arch/pm.h> |
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| 31 | #include <arch/types.h> |
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| 32 | #include <arch.h> |
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| 1078 | jermar | 33 | #include <proc/uarg.h> |
| 703 | jermar | 34 | #include <mm/as.h> |
| 1 | jermar | 35 | |
| 65 | decky | 36 | |
| 37 | /** Enter userspace |
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| 38 | * |
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| 39 | * Change CPU protection level to 3, enter userspace. |
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| 40 | * |
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| 41 | */ |
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| 1078 | jermar | 42 | void userspace(uspace_arg_t *kernel_uarg) |
| 1 | jermar | 43 | { |
| 413 | jermar | 44 | ipl_t ipl; |
| 1 | jermar | 45 | |
| 413 | jermar | 46 | ipl = interrupts_disable(); |
| 22 | jermar | 47 | |
| 315 | jermar | 48 | __asm__ volatile ( |
| 1078 | jermar | 49 | /* |
| 50 | * Clear nested task flag. |
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| 51 | */ |
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| 703 | jermar | 52 | "pushfl\n" |
| 53 | "pop %%eax\n" |
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| 1078 | jermar | 54 | "and $0xffffbfff, %%eax\n" |
| 703 | jermar | 55 | "push %%eax\n" |
| 56 | "popfl\n" |
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| 141 | vana | 57 | |
| 1112 | palkovsky | 58 | /* Set up GS register (TLS) */ |
| 59 | "movl %6, %%gs\n" |
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| 60 | |||
| 125 | jermar | 61 | "pushl %0\n" |
| 62 | "pushl %1\n" |
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| 63 | "pushl %2\n" |
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| 64 | "pushl %3\n" |
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| 65 | "pushl %4\n" |
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| 1078 | jermar | 66 | "movl %5, %%eax\n" |
| 1104 | jermar | 67 | "iret\n" |
| 315 | jermar | 68 | : |
| 1078 | jermar | 69 | : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), |
| 70 | "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry), |
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| 1112 | palkovsky | 71 | "r" (kernel_uarg->uspace_uarg), |
| 72 | "r" (selector(TLS_DES)) |
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| 315 | jermar | 73 | : "eax"); |
| 65 | decky | 74 | |
| 75 | /* Unreachable */ |
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| 703 | jermar | 76 | for(;;) |
| 77 | ; |
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| 1 | jermar | 78 | } |