-
Notifications
You must be signed in to change notification settings - Fork 4
/
main_demo_VirtualFileSystem.cpp
124 lines (110 loc) · 4.09 KB
/
main_demo_VirtualFileSystem.cpp
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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
#include <def.h>
#include <io/IntegerFormatter.h>
#include <interrupt/InterruptManager.h>
#include <interrupt/GenericTimer.h>
#include <interrupt/InterruptHandler.h>
#include <io/Output.h>
#include <memory/MemoryManager.h>
#include <memory/VirtualManager.h>
#include <new>
#include <io/uart/PL011.h>
#include <cstring>
#include <schedule/Process.h>
#include <schedule/ProcessManager.h>
#include <schedule/PidManager.h>
#include <io/VirtioSectorReader.h>
#include <io/virtio/VirtioBlockDriver.h>
#include <io/SectorReaderToByteReader.h>
#include <filesystem/VirutalFileSystem.h>
#include <filesystem/FAT32VirtualFile.h>
#include <filesystem/fat/FAT32ExtBPB.h>
#include <filesystem/fat/FAT32EntryTable.h>
// 此文件示例了如何使用VirtualFileSystem
// 首先，需要一个块设备驱动器，这是通过VirtioBlockDriver实现的
// 提供一个ByteReader
// 然后使用FAT32VirtualFile来读取BPB结构和FAT表
// 初始化一个vfs,并加入一个fat32类型的文件系统节点
// 显示文件系统的根目录的文件内容。
#define GIC_DIST_BASE 0x08000000
#define GIC_REDIST_BASE 0x080A0000
#define GIC_REDIST_RD_BASE (GIC_REDIST_BASE)
#define GIC_REDIST_SGI_BASE (GIC_REDIST_RD_BASE + 1024*64)
extern char ExceptionVectorEL1[];
int main()
{
// determinte current EL
auto curEl = RegCurrentEL::read();
if(curEl.EL != 1)
{
kout << FATAL << "This program is designed to run at EL1\n";
return 1;
}
// 在启用mmu之前，进行必要的组件初始化
new (&pl011) PL011(UART_BASE);
pl011.init();
new (&intHandler) InterruptHandler();
new (&intm) InterruptManager(
reinterpret_cast<char*>(GIC_DIST_BASE),
reinterpret_cast<char*>(GIC_REDIST_BASE));
extern char ramStart[];
extern char ramEnd[];
size_t ramSize = static_cast<size_t>(ramEnd - ramStart);
new (&mman) MemoryManager(ramStart, ramSize,true);
new (&virtman) VirtualManager();
new (&vfs) VirtualFileSystem();
// 初始化中断，但是目前屏蔽了所有的中断
int status=intm.init(
ExceptionVectorEL1,
true,
EOIMode::ack_priority_drop_and_deactivation,
0xFE,
0xF0);
if(status!=0)
return status;
// 至少包含2个对齐的PAGE
void * queueBuffer = mman.allocate(2*VirtioDriver::PAGE_SIZE_4KB,VirtioDriver::PAGE_SIZE_4KB);
if(!queueBuffer)
return 1;
// 对齐处的地址
uint64_t pageAddr = reinterpret_cast<uint64_t>(queueBuffer)/VirtioBlockDriver::PAGE_SIZE_4KB;
VirtioBlockDriver vio(VIRTIO_0_BASE);
size_t descrNum=10;
vio.init(
pageAddr, // 队列的页地址
descrNum, // 队列的大小，legacy需要3个，[0]=8byte,3fields, [1]=data,[2]=1byte status
// 后面这四个参数用于初始化VirtioQueueLayout
reinterpret_cast<void*>(pageAddr*VirtioBlockDriver::PAGE_SIZE_4KB), // virtqueue的基地址
descrNum, // virtqueue的大小
VirtioDriver::USED_RING_ALIGNMENT, // RING的对齐要求
true // 是否初始化区域的值为0
);
VirtioSectorReader vioSecReader(vio);
SectorReaderToByteReader byteReader(vioSecReader);
FAT32ExtBPB bpb;
FAT32EntryTable fat;
FAT32VirtualFile::readBPB(byteReader, bpb);
FAT32VirtualFile::readFAT(byteReader, bpb, fat);
auto fatNode = FAT32VirtualFile::makeRootFile(byteReader, bpb, fat);
vfs.addRootFile(fatNode);
kout << "name : " << fatNode->name() << "\n";
/*
* 注： 根分区的文件名有：(26个，该分区是从树莓派的启动分区获取的)
bcm2708-rpi-0-w.dtb bootcode.bin fixup_x.dat start_cd.elf
bcm2708-rpi-b.dtb cmdline.txt issue.txt start_db.elf
bcm2708-rpi-b-plus.dtb config.txt kernel7.img start.elf
bcm2708-rpi-cm.dtb COPYING.linux kernel.img start_x.elf
bcm2709-rpi-2-b.dtb fixup_cd.dat LICENCE.broadcom xxxhhhddd
bcm2710-rpi-3-b.dtb fixup.dat LICENSE.oracle
bcm2710-rpi-cm3.dtb fixup_db.dat overlays
*/
// 使用普通的方法显示所有的文件名
fatNode->fatDirTable().showAllFileNames();
// 使用lambda 显示
fatNode->foreachFile([](VirtualFile *f){
FAT32VirtualFile* f32 = f->castAsSubType<FAT32VirtualFile>();
kout << f32->name() << "\n";
});
// TODO 使sreader等置于堆中
asm_wfe_loop();
return 0;
}