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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1830 | decky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Jakub Jermar |
| 1830 | decky | 3 | * All rights reserved. |
| 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 | |||
| 1952 | jermar | 29 | /** @addtogroup ia32xen |
| 1830 | decky | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #include <userspace.h> |
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| 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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| 39 | #include <proc/uarg.h> |
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| 40 | #include <mm/as.h> |
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| 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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| 48 | void userspace(uspace_arg_t *kernel_uarg) |
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| 49 | { |
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| 50 | uint32_t ipl = interrupts_disable(); |
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| 51 | |||
| 52 | asm volatile ( |
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| 53 | /* |
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| 54 | * Clear nested task flag. |
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| 55 | */ |
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| 56 | "pushfl\n" |
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| 57 | "pop %%eax\n" |
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| 58 | "and $0xffffbfff, %%eax\n" |
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| 59 | "push %%eax\n" |
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| 60 | "popfl\n" |
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| 61 | |||
| 62 | /* Set up GS register (TLS) */ |
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| 63 | "movl %6, %%gs\n" |
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| 64 | |||
| 65 | "pushl %0\n" |
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| 66 | "pushl %1\n" |
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| 67 | "pushl %2\n" |
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| 68 | "pushl %3\n" |
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| 69 | "pushl %4\n" |
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| 70 | "movl %5, %%eax\n" |
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| 71 | "iret\n" |
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| 72 | : |
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| 1836 | decky | 73 | : "i" (selector(UDATA_DES) | PL_USER), |
| 74 | "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE), |
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| 75 | "r" (ipl), |
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| 76 | "i" (selector(UTEXT_DES) | PL_USER), |
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| 77 | "r" (kernel_uarg->uspace_entry), |
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| 78 | "r" (kernel_uarg->uspace_uarg), |
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| 79 | "r" (selector(TLS_DES)) |
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| 80 | : "eax" |
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| 81 | ); |
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| 1830 | decky | 82 | |
| 83 | /* Unreachable */ |
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| 84 | for(;;) |
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| 85 | ; |
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| 86 | } |
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| 87 | |||
| 88 | /** @} |
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| 89 | */ |