0,0 → 1,64 |
/* |
* Copyright (C) 2005 Ondrej Palkovsky |
* 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. |
*/ |
|
#include <userspace.h> |
#include <arch/pm.h> |
#include <arch/types.h> |
#include <arch.h> |
#include <proc/thread.h> |
#include <mm/vm.h> |
|
|
/** Enter userspace |
* |
* Change CPU protection level to 3, enter userspace. |
* |
*/ |
void userspace(void) |
{ |
ipl_t ipl; |
|
ipl = interrupts_disable(); |
|
__asm__ volatile ("" |
"movq %0, %%rax;" |
"movq %1, %%rbx;" |
"movq %2, %%rcx;" |
"movq %3, %%rdx;" |
"movq %4, %%rsi;" |
"pushq %%rax;" |
"pushq %%rbx;" |
"pushq %%rcx;" |
"pushq %%rdx;" |
"pushq %%rsi;" |
"iretq;" |
: : "i" (gdtselector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+THREAD_STACK_SIZE), "r" (ipl), "i" (gdtselector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS)); |
|
/* Unreachable */ |
for(;;); |
} |