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* Copyright (c) 2005 Ondrej Palkovsky
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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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* - 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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* 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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#include <userspace.h>
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#include <arch/types.h>
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#include <proc/uarg.h>
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* Change CPU protection level to 3, enter userspace.
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void userspace(uspace_arg_t *kernel_uarg)
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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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"pushq %[udata_des]\n"
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"pushq %[stack_size]\n"
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"pushq %[utext_des]\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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:: [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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[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)