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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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#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;
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    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 %0\n"
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              "pushq %1\n"
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              "pushq %2\n"
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              "pushq %3\n"
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              "pushq %4\n"
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              "movq %5, %%rax\n"
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              "iretq\n"
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              : :
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              "i" (gdtselector(UDATA_DES) | PL_USER),
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              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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              "r" (ipl),
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              "i" (gdtselector(UTEXT_DES) | PL_USER),
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              "r" (kernel_uarg->uspace_entry),
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              "r" (kernel_uarg->uspace_uarg)
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              : "rax"
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              );
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    /* Unreachable */
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    for(;;)
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        ;
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}