2
* Copyright (c) 2007 Pavel Jancik, Michal Kebrt
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
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.
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.
29
/** @addtogroup arm32mm
33
* @brief Paging related functions.
36
#include <arch/mm/page.h>
37
#include <genarch/mm/page_pt.h>
41
#include <arch/exception.h>
43
#include <arch/types.h>
44
#include <interrupt.h>
45
#include <arch/mm/frame.h>
47
/** Initializes page tables.
49
* 1:1 virtual-physical mapping is created in kernel address space. Mapping
50
* for table with exception vectors is also created.
52
void page_arch_init(void)
54
int flags = PAGE_CACHEABLE;
55
page_mapping_operations = &pt_mapping_operations;
58
/* Kernel identity mapping */
59
for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
60
page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
62
/* Create mapping for exception table at high offset */
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);
67
#error "Only high exception vector supported now"
70
as_switch(NULL, AS_KERNEL);
72
boot_page_table_free();
75
/** Maps device into the kernel space.
77
* Maps physical address of device into kernel virtual address space (so it can
78
* be accessed only by kernel through virtual address).
80
* @param physaddr Physical address where device is connected.
81
* @param size Length of area where device is present.
83
* @return Virtual address where device will be accessible.
85
uintptr_t hw_map(uintptr_t physaddr, size_t size)
87
if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
88
KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
89
panic("Unable to map physical memory %p (%d bytes).",
93
uintptr_t virtaddr = PA2KA(last_frame);
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);
101
last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);