WebSVN – HelenOS – Diff – /branches/arm/boot/arch/arm32/loader/mm.c


/*
 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
 * 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 arm32boot
 * @{
 */
/** @file
 */
 
#include "mm.h"
 
 
/** Initializes section page table entry.
 *
 *  Will be readable/writable by kernel with no access from user mode.
 *  Will belong to domain 0. No cache or buffering is enabled.
 *  
 *  \param pte    page table entry to set
 *  \param frame  first frame in the section (frame number)
 *  \note  If frame is not 1MB aligned, first lower 1MB aligned frame will be used.
 */  
static void init_pte_level0_section(pte_level0_section_t* pte, unsigned frame)
{
    pte->descriptor_type   = PTE_DESCRIPTOR_SECTION;
    pte->bufferable        = 0;
    pte->cacheable         = 0;
    pte->impl_specific     = 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;
}
 
 
static void init_page_table(void)
{
    int i;
 
    const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION;
    // create 1:1 mapping virtual-physical (in lower 2GB)
    for(i = 0; i < first_kernel_section; i++) {
        init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION);
    }
 
    // create kernel mapping (in upper 2GB), physical addresses starting from 0
    for(i = first_kernel_section; i < PTL0_ENTRIES_ARCH; i++) {
        init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION);
    }
}
 
 
void mmu_start() {
    init_page_table();
    set_ptl0_address(page_table);
    enable_paging();
}
 
/** @}
 */
 
 

Subversion Repositories HelenOS

(root)/branches/arm/boot/arch/arm32/loader/mm.c – Rev 2254 → 2257

Rev 2254		Rev 2257
1	/*	1	/*
2	* Copyright (c) 2007 Pavel Jancik, Michal Kebrt	2	* Copyright (c) 2007 Pavel Jancik, Michal Kebrt
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup arm32boot	29	/** @addtogroup arm32boot
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include "mm.h"	35	#include "mm.h"
36		36
37		37
38	/** Initializes section page table entry.	38	/** Initializes section page table entry.
39	*	39	*
40	* Will be readable/writable by kernel with no access from user mode.	40	* Will be readable/writable by kernel with no access from user mode.
41	* Will belong to domain 0. No cache or buffering is enabled.	41	* Will belong to domain 0. No cache or buffering is enabled.
42	*	42	*
43	* \param pte page table entry to set	43	* \param pte page table entry to set
44	* \param frame first frame in the section (frame number)	44	* \param frame first frame in the section (frame number)
45	* \note If frame is not 1MB aligned, first lower 1MB aligned frame will be used.	45	* \note If frame is not 1MB aligned, first lower 1MB aligned frame will be used.
46	*/	46	*/
47	static void init_pte_level0_section(pte_level0_section* pte, unsigned frame)	47	static void init_pte_level0_section(pte_level0_section_t* pte, unsigned frame)
48	{	48	{
49	pte->descriptor_type = PTE_DESCRIPTOR_SECTION;	49	pte->descriptor_type = PTE_DESCRIPTOR_SECTION;
50	pte->bufferable = 0;	50	pte->bufferable = 0;
51	pte->cacheable = 0;	51	pte->cacheable = 0;
52	pte->impl_specific = 0;	52	pte->impl_specific = 0;
53	pte->domain = 0;	53	pte->domain = 0;
54	pte->should_be_zero_1 = 0;	54	pte->should_be_zero_1 = 0;
55	pte->access_permission = PTE_AP_USER_NO_KERNEL_RW;	55	pte->access_permission = PTE_AP_USER_NO_KERNEL_RW;
56	pte->should_be_zero_2 = 0;	56	pte->should_be_zero_2 = 0;
57	pte->section_base_addr = (frame << FRAME_WIDTH) >> 20;	57	pte->section_base_addr = (frame << FRAME_WIDTH) >> 20;
58	}	58	}
59		59
60		60
61	static void init_page_table(void)	61	static void init_page_table(void)
62	{	62	{
63	int i;	63	int i;
64		64
65	const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION;	65	const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION;
66	// create 1:1 mapping virtual-physical (in lower 2GB)	66	// create 1:1 mapping virtual-physical (in lower 2GB)
67	for(i = 0; i < first_kernel_section; i++) {	67	for(i = 0; i < first_kernel_section; i++) {
68	init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION);	68	init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION);
69	}	69	}
70		70
71	// create kernel mapping (in upper 2GB), physical addresses starting from 0	71	// create kernel mapping (in upper 2GB), physical addresses starting from 0
72	for(i = first_kernel_section; i < PTL0_ENTRIES_ARCH; i++) {	72	for(i = first_kernel_section; i < PTL0_ENTRIES_ARCH; i++) {
73	init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION);	73	init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION);
74	}	74	}
75	}	75	}
76		76
77		77
78	void mmu_start() {	78	void mmu_start() {
79	init_page_table();	79	init_page_table();
80	set_ptl0_address(page_table);	80	set_ptl0_address(page_table);
81	enable_paging();	81	enable_paging();
82	}	82	}
83		83
84	/** @}	84	/** @}
85	*/	85	*/
86		86
87		87