/*
* 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/as.h>
/** Enter userspace
*
* Change CPU protection level to 3, enter userspace.
*
*/
void userspace(__address entry)
{
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),
"r" (entry));
/* Unreachable */
for(;;);
}