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257 palkovsky 1
/*
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 * Copyright (c) 2005 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup amd64
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 * @{
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 */
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/** @file
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 */
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#include <userspace.h>
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#include <arch/pm.h>
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#include <arch/types.h>
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#include <arch.h>
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#include <proc/uarg.h>
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#include <mm/as.h>
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/** Enter userspace
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 *
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 * Change CPU protection level to 3, enter userspace.
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 *
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 */
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void userspace(uspace_arg_t *kernel_uarg)
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{
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    ipl_t ipl = interrupts_disable();
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    /* Clear CF, PF, AF, ZF, SF, DF, OF */
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    ipl &= ~(0xcd4);
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    asm volatile (
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            "pushq %[udata_des]\n"
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            "pushq %[stack_size]\n"
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            "pushq %[ipl]\n"
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            "pushq %[utext_des]\n"
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            "pushq %[entry]\n"
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            "movq %[uarg], %%rax\n"
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            /* %rdi is defined to hold pcb_ptr - set it to 0 */
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            "xorq %%rdi, %%rdi\n"
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            "iretq\n"
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            :: [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER),
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               [stack_size] "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
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               [ipl] "r" (ipl),
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               [utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER),
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               [entry] "r" (kernel_uarg->uspace_entry),
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               [uarg] "r" (kernel_uarg->uspace_uarg)
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            : "rax"
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        );
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    /* Unreachable */
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    while (1);
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}
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/** @}
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 */