| 0,0 → 1,80 |
|---|
| /* |
| * 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); |
| } |
| |
| /** @} |
| */ |