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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 | |||
| 1888 | jermar | 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 | { |
| 413 | jermar | 50 | ipl_t ipl; |
| 257 | palkovsky | 51 | |
| 413 | jermar | 52 | ipl = interrupts_disable(); |
| 257 | palkovsky | 53 | |
| 1102 | palkovsky | 54 | /* Clear CF,PF,AF,ZF,SF,DF,OF */ |
| 1119 | palkovsky | 55 | ipl &= ~(0xcd4); |
| 1102 | palkovsky | 56 | |
| 2082 | decky | 57 | asm volatile ("" |
| 1066 | jermar | 58 | "pushq %0\n" |
| 59 | "pushq %1\n" |
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| 60 | "pushq %2\n" |
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| 61 | "pushq %3\n" |
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| 62 | "pushq %4\n" |
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| 1078 | jermar | 63 | "movq %5, %%rax\n" |
| 3222 | svoboda | 64 | /* %rdi is defined to hold pcb_ptr - set it to 0 */ |
| 65 | "xorq %%rdi, %%rdi\n" |
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| 1066 | jermar | 66 | "iretq\n" |
| 67 | : : |
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| 68 | "i" (gdtselector(UDATA_DES) | PL_USER), |
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| 1078 | jermar | 69 | "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), |
| 802 | palkovsky | 70 | "r" (ipl), |
| 71 | "i" (gdtselector(UTEXT_DES) | PL_USER), |
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| 1078 | jermar | 72 | "r" (kernel_uarg->uspace_entry), |
| 73 | "r" (kernel_uarg->uspace_uarg) |
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| 74 | : "rax" |
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| 75 | ); |
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| 257 | palkovsky | 76 | |
| 77 | /* Unreachable */ |
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| 1078 | jermar | 78 | for(;;) |
| 79 | ; |
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| 257 | palkovsky | 80 | } |
| 1702 | cejka | 81 | |
| 1888 | jermar | 82 | /** @} |
| 1702 | cejka | 83 | */ |