77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gnu/syscall.h>
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struct mach_msg_int_address
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{
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mach_msg_header_t header;
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mach_msg_type_t type_one; int one;
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mach_msg_type_t type_two; vm_address_t two;
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};
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struct mach_msg_address_int_int
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{
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mach_msg_header_t header;
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mach_msg_type_t type_one; vm_address_t one;
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mach_msg_type_t type_two; vm_size_t two;
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mach_msg_type_t type_three; boolean_t three;
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};
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const mach_msg_type_t mach_msg_type_boolean =
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{
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(unsigned char) MACH_MSG_TYPE_BOOLEAN, // msgt_name
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32, // msgt_size
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1, // msgt_number
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1, // msgt_inline
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0, // msgt_longform
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0, // msgt_deallocate
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0 // msgt_unused
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};
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kern_return_t
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__vm_allocate (mach_port_t task, vm_address_t *address, vm_size_t size, boolean_t anywhere)
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{
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union message
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{
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struct mach_msg_address_int_int request;
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struct mach_msg_int_address reply;
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};
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union message message = {0};
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message.request.header.msgh_size = sizeof (message.request);
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message.request.type_one = mach_msg_type_int32;
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message.request.one = *address;
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message.request.type_two = mach_msg_type_int32;
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message.request.two = size;
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message.request.type_three = mach_msg_type_boolean;
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message.request.three = anywhere;
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kern_return_t result = __syscall_get (task, SYS__vm_allocate,
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&message.request.header,
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sizeof (message.reply));
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if (message.reply.one != KERN_SUCCESS)
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return message.reply.one;
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if (result == KERN_SUCCESS)
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*address = message.reply.two;
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return result;
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}
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