WebSVN – HelenOS – Diff – /branches/dynload/kernel/arch/arm32/src/mm/page.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 arm32mm
 * @{
 */
/** @file
 *  @brief Paging related functions.
 */
 
#include <arch/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <mm/page.h>
#include <align.h>
#include <config.h>
#include <arch/exception.h>
#include <typedefs.h>
#include <arch/types.h>
#include <interrupt.h>
#include <arch/mm/frame.h>
 
/** Initializes page tables.
 *
 * 1:1 virtual-physical mapping is created in kernel address space. Mapping
 * for table with exception vectors is also created.
 */
void page_arch_init(void)
{
 
    int flags = PAGE_CACHEABLE;
 
    page_mapping_operations = &pt_mapping_operations;
   
    uintptr_t cur;
 
    /* Kernel identity mapping */
    for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
 
   
    /* Create mapping for exception table at high offset */
#ifdef HIGH_EXCEPTION_VECTORS
    void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
    page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
#else
#error "Only high exception vector supported now"
#endif
   
    as_switch(NULL, AS_KERNEL);
   
    boot_page_table_free();
}
 
/** Maps device into the kernel space.
 *
 * Maps physical address of device into kernel virtual address space (so it can
 * be accessed only by kernel through virtual address).
 *
 * @param physaddr Physical address where device is connected.
 * @param size Length of area where device is present.
 *
 * @return Virtual address where device will be accessible.
 */
uintptr_t hw_map(uintptr_t physaddr, size_t size)
{
    if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
        KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
        panic("Unable to map physical memory %p (%d bytes).",
            physaddr, size)
    }
   
    uintptr_t virtaddr = PA2KA(last_frame);
    pfn_t i;
    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
            physaddr + PFN2ADDR(i),
            PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
    }
   
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
    return virtaddr;
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/arch/arm32/src/mm/page.c – Rev 4344 → 4346

Rev 4344		Rev 4346
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 arm32mm	29	/** @addtogroup arm32mm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	* @brief Paging related functions.	33	* @brief Paging related functions.
34	*/	34	*/
35		35
36	#include <arch/mm/page.h>	36	#include <arch/mm/page.h>
37	#include <genarch/mm/page_pt.h>	37	#include <genarch/mm/page_pt.h>
38	#include <mm/page.h>	38	#include <mm/page.h>
39	#include <align.h>	39	#include <align.h>
40	#include <config.h>	40	#include <config.h>
41	#include <arch/exception.h>	41	#include <arch/exception.h>
42	#include <typedefs.h>	42	#include <typedefs.h>
43	#include <arch/types.h>	43	#include <arch/types.h>
44	#include <interrupt.h>	44	#include <interrupt.h>
45	#include <arch/mm/frame.h>	45	#include <arch/mm/frame.h>
46		46
47	/** Initializes page tables.	47	/** Initializes page tables.
48	*	48	*
49	* 1:1 virtual-physical mapping is created in kernel address space. Mapping	49	* 1:1 virtual-physical mapping is created in kernel address space. Mapping
50	* for table with exception vectors is also created.	50	* for table with exception vectors is also created.
51	*/	51	*/
52	void page_arch_init(void)	52	void page_arch_init(void)
53	{	53	{
54	uintptr_t cur;	-
55	int flags;	54	int flags = PAGE_CACHEABLE;
56		-
57	page_mapping_operations = &pt_mapping_operations;	55	page_mapping_operations = &pt_mapping_operations;
58		56
59	flags = PAGE_CACHEABLE;	57	uintptr_t cur;
60		-
61	/* PA2KA(identity) mapping for all frames until last_frame */	58	/* Kernel identity mapping */
62	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {	59	for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
63	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);	60	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
64	}	-
65		61
66	/* create mapping for exception table at high offset */	62	/* Create mapping for exception table at high offset */
67	#ifdef HIGH_EXCEPTION_VECTORS	63	#ifdef HIGH_EXCEPTION_VECTORS
68	void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);	64	void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
69	page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);	65	page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
70	#else	66	#else
71	#error "Only high exception vector supported now"	67	#error "Only high exception vector supported now"
72	#endif	68	#endif
73		69
74	as_switch(NULL, AS_KERNEL);	70	as_switch(NULL, AS_KERNEL);
75		71
76	boot_page_table_free();	72	boot_page_table_free();
77	}	73	}
78		74
79	/** Maps device into the kernel space.	75	/** Maps device into the kernel space.
80	*	76	*
81	* Maps physical address of device into kernel virtual address space (so it can	77	* Maps physical address of device into kernel virtual address space (so it can
82	* be accessed only by kernel through virtual address).	78	* be accessed only by kernel through virtual address).
83	*	79	*
84	* @param physaddr Physical address where device is connected.	80	* @param physaddr Physical address where device is connected.
85	* @param size Length of area where device is present.	81	* @param size Length of area where device is present.
86	*	82	*
87	* @return Virtual address where device will be accessible.	83	* @return Virtual address where device will be accessible.
88	*/	84	*/
89	uintptr_t hw_map(uintptr_t physaddr, size_t size)	85	uintptr_t hw_map(uintptr_t physaddr, size_t size)
90	{	86	{
91	if (last_frame + ALIGN_UP(size, PAGE_SIZE) >	87	if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
92	KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {	88	KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
93	panic("Unable to map physical memory %p (%d bytes).",	89	panic("Unable to map physical memory %p (%d bytes).",
94	physaddr, size)	90	physaddr, size)
95	}	91	}
96		92
97	uintptr_t virtaddr = PA2KA(last_frame);	93	uintptr_t virtaddr = PA2KA(last_frame);
98	pfn_t i;	94	pfn_t i;
99	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {	95	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
100	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),	96	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
101	physaddr + PFN2ADDR(i),	97	physaddr + PFN2ADDR(i),
102	PAGE_NOT_CACHEABLE \| PAGE_READ \| PAGE_WRITE \| PAGE_KERNEL);	98	PAGE_NOT_CACHEABLE \| PAGE_READ \| PAGE_WRITE \| PAGE_KERNEL);
103	}	99	}
104		100
105	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	101	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
106	return virtaddr;	102	return virtaddr;
107	}	103	}
108		104
109	/** @}	105	/** @}
110	*/	106	*/
111		107