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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 257 | palkovsky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Ondrej Palkovsky |
| 257 | palkovsky | 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 | |||
| 4345 | svoboda | 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 | { |
| 4345 | svoboda | 50 | ipl_t ipl = interrupts_disable(); |
| 257 | palkovsky | 51 | |
| 4345 | svoboda | 52 | /* Clear CF, PF, AF, ZF, SF, DF, OF */ |
| 1119 | palkovsky | 53 | ipl &= ~(0xcd4); |
| 257 | palkovsky | 54 | |
| 4345 | svoboda | 55 | asm volatile ( |
| 56 | "pushq %[udata_des]\n" |
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| 57 | "pushq %[stack_size]\n" |
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| 58 | "pushq %[ipl]\n" |
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| 59 | "pushq %[utext_des]\n" |
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| 60 | "pushq %[entry]\n" |
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| 61 | "movq %[uarg], %%rax\n" |
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| 62 | |||
| 63 | /* %rdi is defined to hold pcb_ptr - set it to 0 */ |
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| 64 | "xorq %%rdi, %%rdi\n" |
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| 65 | "iretq\n" |
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| 66 | :: [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER), |
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| 67 | [stack_size] "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE), |
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| 68 | [ipl] "r" (ipl), |
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| 69 | [utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER), |
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| 70 | [entry] "r" (kernel_uarg->uspace_entry), |
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| 71 | [uarg] "r" (kernel_uarg->uspace_uarg) |
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| 72 | : "rax" |
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| 73 | ); |
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| 74 | |||
| 257 | palkovsky | 75 | /* Unreachable */ |
| 4345 | svoboda | 76 | while (1); |
| 257 | palkovsky | 77 | } |
| 1702 | cejka | 78 | |
| 1888 | jermar | 79 | /** @} |
| 1702 | cejka | 80 | */ |