Subversion Repositories HelenOS

Rev

Rev 4055 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2128 jermar 1
/*
2465 jermar 2
 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
2128 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/** @addtogroup arm32mm
30
 * @{
31
 */
32
/** @file
2465 jermar 33
 *  @brief Paging related functions.
2128 jermar 34
 */
35
 
36
#include <arch/mm/page.h>
37
#include <genarch/mm/page_pt.h>
38
#include <mm/page.h>
2465 jermar 39
#include <align.h>
40
#include <config.h>
41
#include <arch/exception.h>
42
#include <typedefs.h>
43
#include <arch/types.h>
44
#include <interrupt.h>
45
#include <arch/mm/frame.h>
2128 jermar 46
 
2465 jermar 47
/** Initializes page tables.
48
 *
49
 * 1:1 virtual-physical mapping is created in kernel address space. Mapping
50
 * for table with exception vectors is also created.
51
 */
2128 jermar 52
void page_arch_init(void)
53
{
4156 trochtova 54
    int flags = PAGE_CACHEABLE;
55
    page_mapping_operations = &pt_mapping_operations;
56
 
2465 jermar 57
    uintptr_t cur;
4156 trochtova 58
    /* Kernel identity mapping */
59
    for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
2465 jermar 60
        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
61
 
4156 trochtova 62
    /* Create mapping for exception table at high offset */
2465 jermar 63
#ifdef HIGH_EXCEPTION_VECTORS
64
    void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
65
    page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
66
#else
67
#error "Only high exception vector supported now"
68
#endif
4156 trochtova 69
 
2465 jermar 70
    as_switch(NULL, AS_KERNEL);
4156 trochtova 71
 
2465 jermar 72
    boot_page_table_free();
2128 jermar 73
}
74
 
2465 jermar 75
/** Maps device into the kernel space.
76
 *
77
 * Maps physical address of device into kernel virtual address space (so it can
78
 * be accessed only by kernel through virtual address).
79
 *
80
 * @param physaddr Physical address where device is connected.
81
 * @param size Length of area where device is present.
82
 *
83
 * @return Virtual address where device will be accessible.
84
 */
2128 jermar 85
uintptr_t hw_map(uintptr_t physaddr, size_t size)
86
{
2465 jermar 87
    if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
88
        KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
4055 trochtova 89
        panic("Unable to map physical memory %p (%d bytes).",
2465 jermar 90
            physaddr, size)
91
    }
4156 trochtova 92
 
2465 jermar 93
    uintptr_t virtaddr = PA2KA(last_frame);
94
    pfn_t i;
95
    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
96
        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
97
            physaddr + PFN2ADDR(i),
98
            PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
99
    }
4156 trochtova 100
 
2465 jermar 101
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
102
    return virtaddr;
2128 jermar 103
}
104
 
105
/** @}
106
 */