| 0,0 → 1,81 |
|---|
| /* |
| * Copyright (c) 2003-2004 Jakub Jermar |
| * 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 arm32mm |
| * @{ |
| */ |
| /** @file |
| */ |
| #include "mm.h" |
| |
| void init_pte_level0_section_entry( pte_level0_section* pte, unsigned frame){ |
| pte->descriptor_type = pte_descriptor_section; |
| pte->bufferable = 0; // disable |
| pte->cacheable = 0; |
| pte->machine_depend = 0; |
| pte->domain = 0; |
| pte->should_be_zero_1 = 0; |
| pte->access_permission = pte_ap_user_no_kernel_rw; |
| pte->should_be_zero_2 = 0; |
| pte->section_base_addr = (frame << FRAME_WIDTH) >> 20; |
| }; |
| |
| |
| // set memory mapping for kernel |
| void mm_kernel_mapping(void) { |
| int i; |
| // Create 1:1 mapping |
| for( i=0; i < 4096; i++) |
| init_pte_level0_section_entry(&page_table[i+0000], i * FRAMES_PER_SECTION); |
| |
| // Create Kernel mapping |
| const unsigned int offset = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION; |
| for( i = offset; i < 4096; i++) |
| init_pte_level0_section_entry(&page_table[i], (i - offset) * FRAMES_PER_SECTION); |
| |
| SET_PTL0_ADDRESS_ARCH( page_table); |
| |
| // enable paging |
| asm volatile ( |
| "ldr r0, =0x55555555 \n" |
| "mcr p15, 0, r0, c3, c0, 0 \n" //set domain acces rights to client <==> take rights from page tables |
| "mrc p15, 0, r0, c1, c0, 0 \n" // get current setting of system ... register 1 isn't only for memmory management |
| "ldr r1, =0xFFFFFE8D \n" // mask to disable aligment checks, System, Rom bit disable |
| "and r0, r0, r1 \n" |
| "ldr r1, =0x00000001 \n" // mask to enable paging |
| "orr r0, r0, r1 \n" |
| "mcr p15, 0, r0, c1, c0, 0 \n" // store setting |
| : |
| : |
| : "r0", "r1" |
| ); |
| }; |
| |
| /** @} |
| */ |
| |