1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
#include "vmm.h"
#include <stdlib.h>
typedef void (*constructor)();
extern "C" {
/* .text */
uint32_t begin_text;
uint32_t end_text;
/* .rodata */
uint32_t begin_rodata;
uint32_t end_rodata;
/* .data */
uint32_t begin_constinit;
uint32_t end_constinit;
constructor begin_ctors;
constructor end_ctors;
uint32_t begin_data;
uint32_t end_data;
/* .bss */
uint32_t begin_bss;
uint32_t end_bss;
void kernel_constructors() {
for (constructor* i = &begin_ctors; i != &end_ctors; ++i) (*i)();
}
void dump_address() {
printk("text begin: ", uhex{reinterpret_cast<uint32_t>(&begin_text)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_text)}, '\n');
printk("rodata begin: ", uhex{reinterpret_cast<uint32_t>(&begin_rodata)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_rodata)}, '\n');
printk("constinit begin: ", uhex{reinterpret_cast<uint32_t>(&begin_constinit)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_constinit)}, '\n');
printk("ctors begin: ", uhex{reinterpret_cast<uint32_t>(&begin_ctors)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_ctors)}, '\n');
printk("data begin: ", uhex{reinterpret_cast<uint32_t>(&begin_data)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_data)}, '\n');
printk("bss begin: ", uhex{reinterpret_cast<uint32_t>(&begin_bss)},
" end: ", uhex{reinterpret_cast<uint32_t>(&end_bss)}, '\n');
}
} // extern "C"
/* boot.S page directory and kernel page table */
extern uint32_t kernel_pagedir;
extern uint32_t kernel_ptable0;
constexpr uint32_t to_vma(uint32_t page_dir_address) {
page_dir_address &= 0xfffff000;
page_dir_address += 0xc0000000;
page_dir_address -= 0x00400000;
return page_dir_address;
}
vmm::vmm(uint32_t* addr) : directory{(addr == nullptr) ? &kernel_pagedir : addr} {
printk("page directory is at ", uhex{reinterpret_cast<uint32_t>(directory)}, '\n');
printk("page table 768 ", uhex{reinterpret_cast<uint32_t>(directory[768])}, '\n');
printk("page table 768 vma ", uhex{to_vma(reinterpret_cast<uint32_t>(directory[768]))}, '\n');
printk("kernel_ptable0 is at ", uhex{reinterpret_cast<uint32_t>(&kernel_ptable0)}, '\n');
uint32_t* page = reinterpret_cast<uint32_t*>(&kernel_ptable0);
for (size_t i = 0; i < 32; ++i) {
printk(uhex{page[i] & 0xfffff000}, ' ');
if (i % 4 == 3) printk('\n');
}
}
uint32_t vmm::map(uint32_t phys_addr, uint32_t dest) {
const auto phys_offset = phys_addr % 4096;
const auto phys_page = phys_addr - phys_offset;
const auto table = table_id(dest);
const auto page = page_id(dest - table * 4 * 1024 * 1024);
printk("phys_addr page: ", uhex{phys_page}, '\n');
printk(" offset: ", uhex{phys_offset}, '\n');
printk(" table: ", table, '\n');
printk(" page: ", page, '\n');
if (directory[table] == 0) return 0;
uint32_t* page_table = reinterpret_cast<uint32_t*>(to_vma(reinterpret_cast<uint32_t>(directory[table])));
if (page_table[page] != 0) return 0;
page_table[page] = phys_page | 0x003;
uint32_t cr0;
asm volatile("mov %%cr0, %0" : "=r"(cr0));
asm volatile("mov %0, %%cr0" : : "r"(cr0));
return table * 4 * 1024 * 1024 + page * 4 * 1024 + phys_offset;
}
|
