| 1 | /*
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| 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 |
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| 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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| 33 | #include <proc/uarg.h>
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| 34 | #include <mm/as.h>
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| 35 |
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| 36 |
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| 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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| 42 | void userspace(uspace_arg_t *kernel_uarg)
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| 43 | {
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| 44 | ipl_t ipl;
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| 45 |
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| 46 | ipl = interrupts_disable();
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| 47 |
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| 48 | __asm__ volatile (
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| 49 | /*
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| 50 | * Clear nested task flag.
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| 51 | */
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| 52 | "pushfl\n"
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| 53 | "pop %%eax\n"
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| 54 | "and $0xffffbfff, %%eax\n"
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| 55 | "push %%eax\n"
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| 56 | "popfl\n"
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| 57 |
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| 58 | /* Set up GS register (TLS) */
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| 59 | "movl %6, %%gs\n"
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| 60 |
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| 61 | "pushl %0\n"
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| 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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| 66 | "movl %5, %%eax\n"
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| 67 | "iret\n"
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| 68 | :
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| 69 | : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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| 70 | "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry),
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| 71 | "r" (kernel_uarg->uspace_uarg),
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| 72 | "r" (selector(TLS_DES))
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| 73 | : "eax");
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| 74 |
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| 75 | /* Unreachable */
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| 76 | for(;;)
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| 77 | ;
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| 78 | }
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