Changeset 5b23a82 in mainline for kernel/arch/xen32/src
- Timestamp:
- 2006-08-01T21:12:54Z (19 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 7c5a8dd
- Parents:
- 7d3d641
- File:
-
- 1 edited
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- Unmodified
- Added
- Removed
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kernel/arch/xen32/src/userspace.c
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Property mode
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r7d3d641 r5b23a82 1 ../../ia32/src/userspace.c 1 /* 2 * Copyright (C) 2005 Jakub Jermar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * - The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /** @addtogroup xen32 30 * @{ 31 */ 32 /** @file 33 */ 34 35 #include <userspace.h> 36 #include <arch/pm.h> 37 #include <arch/types.h> 38 #include <arch.h> 39 #include <proc/uarg.h> 40 #include <mm/as.h> 41 42 43 /** Enter userspace 44 * 45 * Change CPU protection level to 3, enter userspace. 46 * 47 */ 48 void userspace(uspace_arg_t *kernel_uarg) 49 { 50 uint32_t ipl = interrupts_disable(); 51 52 asm volatile ( 53 /* 54 * Clear nested task flag. 55 */ 56 "pushfl\n" 57 "pop %%eax\n" 58 "and $0xffffbfff, %%eax\n" 59 "push %%eax\n" 60 "popfl\n" 61 62 /* Set up GS register (TLS) */ 63 "movl %6, %%gs\n" 64 65 "pushl %0\n" 66 "pushl %1\n" 67 "pushl %2\n" 68 "pushl %3\n" 69 "pushl %4\n" 70 "movl %5, %%eax\n" 71 "iret\n" 72 : 73 : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), 74 "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry), 75 "r" (kernel_uarg->uspace_uarg), 76 "r" (selector(TLS_DES)) 77 : "eax"); 78 79 /* Unreachable */ 80 for(;;) 81 ; 82 } 83 84 /** @} 85 */ -
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