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| Rev | Author | Line No. | Line |
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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 | |||
| 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/thread.h> |
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| 703 | jermar | 34 | #include <mm/as.h> |
| 257 | palkovsky | 35 | |
| 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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| 938 | jermar | 42 | void userspace(__address entry) |
| 257 | palkovsky | 43 | { |
| 413 | jermar | 44 | ipl_t ipl; |
| 257 | palkovsky | 45 | |
| 413 | jermar | 46 | ipl = interrupts_disable(); |
| 257 | palkovsky | 47 | |
| 48 | __asm__ volatile ("" |
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| 49 | "movq %0, %%rax;" |
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| 50 | "movq %1, %%rbx;" |
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| 51 | "movq %2, %%rcx;" |
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| 52 | "movq %3, %%rdx;" |
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| 53 | "movq %4, %%rsi;" |
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| 54 | "pushq %%rax;" |
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| 55 | "pushq %%rbx;" |
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| 56 | "pushq %%rcx;" |
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| 57 | "pushq %%rdx;" |
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| 58 | "pushq %%rsi;" |
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| 59 | "iretq;" |
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| 802 | palkovsky | 60 | : : "i" (gdtselector(UDATA_DES) | PL_USER), |
| 61 | "i" (USTACK_ADDRESS+THREAD_STACK_SIZE), |
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| 62 | "r" (ipl), |
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| 63 | "i" (gdtselector(UTEXT_DES) | PL_USER), |
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| 938 | jermar | 64 | "r" (entry)); |
| 257 | palkovsky | 65 | |
| 66 | /* Unreachable */ |
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| 67 | for(;;); |
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| 68 | } |