| 0,0 → 1,91 |
|---|
| /* |
| * Copyright (c) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup ia32 |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <userspace.h> |
| #include <arch/pm.h> |
| #include <arch/types.h> |
| #include <arch.h> |
| #include <proc/uarg.h> |
| #include <mm/as.h> |
| |
| |
| /** Enter userspace |
| * |
| * Change CPU protection level to 3, enter userspace. |
| * |
| */ |
| void userspace(uspace_arg_t *kernel_uarg) |
| { |
| ipl_t ipl; |
| |
| ipl = interrupts_disable(); |
| |
| asm volatile ( |
| /* |
| * Clear nested task flag. |
| */ |
| "pushfl\n" |
| "pop %%eax\n" |
| "and $0xffffbfff, %%eax\n" |
| "push %%eax\n" |
| "popfl\n" |
| |
| /* Set up GS register (TLS) */ |
| "movl %6, %%gs\n" |
| |
| "pushl %0\n" |
| "pushl %1\n" |
| "pushl %2\n" |
| "pushl %3\n" |
| "pushl %4\n" |
| "movl %5, %%eax\n" |
| "iret\n" |
| : |
| : "i" (selector(UDATA_DES) | PL_USER), |
| "r" ((uint8_t *) kernel_uarg->uspace_stack + |
| THREAD_STACK_SIZE), |
| "r" (ipl), |
| "i" (selector(UTEXT_DES) | PL_USER), |
| "r" (kernel_uarg->uspace_entry), |
| "r" (kernel_uarg->uspace_uarg), |
| "r" (selector(TLS_DES)) |
| : "eax"); |
| |
| /* Unreachable */ |
| for(;;) |
| ; |
| } |
| |
| /** @} |
| */ |