/*
* 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.
*/
/** @addtogroup amd64
* @{
*/
/** @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 = interrupts_disable();
/* Clear CF, PF, AF, ZF, SF, DF, OF */
ipl &= ~(0xcd4);
asm volatile (
"pushq %[udata_des]\n"
"pushq %[stack_size]\n"
"pushq %[ipl]\n"
"pushq %[utext_des]\n"
"pushq %[entry]\n"
"movq %[uarg], %%rax\n"
/* %rdi is defined to hold pcb_ptr - set it to 0 */
"xorq %%rdi, %%rdi\n"
"iretq\n"
:: [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER),
[stack_size] "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
[ipl] "r" (ipl),
[utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER),
[entry] "r" (kernel_uarg->uspace_entry),
[uarg] "r" (kernel_uarg->uspace_uarg)
: "rax"
);
/* Unreachable */
while (1);
}
/** @}
*/