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Merge pull request #21 from syswonder/dev
more sub-chapters for crates part
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# 贡献者 | ||
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感谢以下同学、单位的支持和贡献: | ||
感谢以下同学对 RuxOS 的支持和贡献: | ||
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|姓名|github ID|单位| | ||
|----|---------|----| | ||
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# 架构相关 | ||
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不同的架构在中断异常处理等方面有着很大的不同,在 Arm 架构上,有专门用于处理一般中断异常的通用中断控制器(Generic Interrupt Controller)、串口设备PL011、设备树,RuxOS 底层组件提供了相关的驱动支持。 | ||
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### ARM GIC | ||
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Arm 架构上中断被分为了:SGI、PPI、SPI 三种类型: | ||
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- SGI:Software Generated Interrupt,软件中断,分配中断号0-15,用于处理器间通信。 | ||
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- PPI:Private Peripheral Interrupt,私有外设中断,来源于指定的外设,并且由指定的 CPU 进行处理,分配中断号16-31。 | ||
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- SPI:Shared Peripheral Interrupt,共享外设中断,来源于外设,可由任意的 CPU 进行处理,分配中断号32-1019。 | ||
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GIC 分为了 GICD(GIC Distributor)和 GICC(GIC Cpu Interface)两端的接口及相关寄存器: | ||
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- GICD:用于中断仲裁和转发,具体功能包括使能中断、设置中断优先级、设置中断转发到 CPU 端的转发表、设置中断触发方式(边沿触发/水平触发)、转发 SGI 中断到一个或多个目标处理器、维护中断状态。 | ||
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- GICC:用于管理到达指定 CPU 的相关中断,包括识别中断、发送中断完成信号、设置当前 CPU 的中断优先级掩码、定义抢占策略。 | ||
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### ARM PL011 | ||
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PL011 串口设备遵循[官方文档](https://developer.arm.com/documentation/ddi0183/latest)来进行实现,提供如下编程接口: | ||
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- 创建、初始化一个 PL011 串口实例。 | ||
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- 从该 UART 设备读或向其写入一个字符。 | ||
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- 处理 UART 中断。 | ||
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### DTB | ||
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设备树借助了 Rust 第三方库 [`fdt-rs`](https://crates.io/crates/fdt-rs) 来进行解析,目前支持读取相关外设信息和获取设备树上指定类型的节点信息,该库目前仍在完善中。 | ||
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在后期的工作中,将对 DTB 进行更深的解析和使用,通过规范的设备树文件来获取当前运行环境中的内存大小、内存起始地址、外设地址等信息。 | ||
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### Linux 错误类型 axerrno | ||
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RuxOS 移植了 ArceOS 的 axerrno 模块,用于匹配标准的 Linux 错误类型,方便上层的相关模块实现和进行错误处理。 | ||
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目前支持的错误类型如下: | ||
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```C | ||
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | ||
/* Copy from /usr/include/asm-generic/errno-base.h and /usr/include/asm-generic/errno.h */ | ||
#ifndef _ASM_GENERIC_ERRNO_BASE_H | ||
#define _ASM_GENERIC_ERRNO_BASE_H | ||
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#define EPERM 1 /* Operation not permitted */ | ||
#define ENOENT 2 /* No such file or directory */ | ||
#define ESRCH 3 /* No such process */ | ||
#define EINTR 4 /* Interrupted system call */ | ||
#define EIO 5 /* I/O error */ | ||
#define ENXIO 6 /* No such device or address */ | ||
#define E2BIG 7 /* Argument list too long */ | ||
#define ENOEXEC 8 /* Exec format error */ | ||
#define EBADF 9 /* Bad file number */ | ||
#define ECHILD 10 /* No child processes */ | ||
#define EAGAIN 11 /* Try again */ | ||
#define ENOMEM 12 /* Out of memory */ | ||
#define EACCES 13 /* Permission denied */ | ||
#define EFAULT 14 /* Bad address */ | ||
#define ENOTBLK 15 /* Block device required */ | ||
#define EBUSY 16 /* Device or resource busy */ | ||
#define EEXIST 17 /* File exists */ | ||
#define EXDEV 18 /* Cross-device link */ | ||
#define ENODEV 19 /* No such device */ | ||
#define ENOTDIR 20 /* Not a directory */ | ||
#define EISDIR 21 /* Is a directory */ | ||
#define EINVAL 22 /* Invalid argument */ | ||
#define ENFILE 23 /* File table overflow */ | ||
#define EMFILE 24 /* Too many open files */ | ||
#define ENOTTY 25 /* Not a typewriter */ | ||
#define ETXTBSY 26 /* Text file busy */ | ||
#define EFBIG 27 /* File too large */ | ||
#define ENOSPC 28 /* No space left on device */ | ||
#define ESPIPE 29 /* Illegal seek */ | ||
#define EROFS 30 /* Read-only file system */ | ||
#define EMLINK 31 /* Too many links */ | ||
#define EPIPE 32 /* Broken pipe */ | ||
#define EDOM 33 /* Math argument out of domain of func */ | ||
#define ERANGE 34 /* Math result not representable */ | ||
#define EDEADLK 35 /* Resource deadlock would occur */ | ||
#define ENAMETOOLONG 36 /* File name too long */ | ||
#define ENOLCK 37 /* No record locks available */ | ||
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/* | ||
* This error code is special: arch syscall entry code will return | ||
* -ENOSYS if users try to call a syscall that doesn't exist. To keep | ||
* failures of syscalls that really do exist distinguishable from | ||
* failures due to attempts to use a nonexistent syscall, syscall | ||
* implementations should refrain from returning -ENOSYS. | ||
*/ | ||
#define ENOSYS 38 /* Invalid system call number */ | ||
#define ENOTEMPTY 39 /* Directory not empty */ | ||
#define ELOOP 40 /* Too many symbolic links encountered */ | ||
// #define EWOULDBLOCK EAGAIN /* Operation would block */ | ||
#define ENOMSG 42 /* No message of desired type */ | ||
#define EIDRM 43 /* Identifier removed */ | ||
#define ECHRNG 44 /* Channel number out of range */ | ||
#define EL2NSYNC 45 /* Level 2 not synchronized */ | ||
#define EL3HLT 46 /* Level 3 halted */ | ||
#define EL3RST 47 /* Level 3 reset */ | ||
#define ELNRNG 48 /* Link number out of range */ | ||
#define EUNATCH 49 /* Protocol driver not attached */ | ||
#define ENOCSI 50 /* No CSI structure available */ | ||
#define EL2HLT 51 /* Level 2 halted */ | ||
#define EBADE 52 /* Invalid exchange */ | ||
#define EBADR 53 /* Invalid request descriptor */ | ||
#define EXFULL 54 /* Exchange full */ | ||
#define ENOANO 55 /* No anode */ | ||
#define EBADRQC 56 /* Invalid request code */ | ||
#define EBADSLT 57 /* Invalid slot */ | ||
// #define EDEADLOCK EDEADLK | ||
#define EBFONT 59 /* Bad font file format */ | ||
#define ENOSTR 60 /* Device not a stream */ | ||
#define ENODATA 61 /* No data available */ | ||
#define ETIME 62 /* Timer expired */ | ||
#define ENOSR 63 /* Out of streams resources */ | ||
#define ENONET 64 /* Machine is not on the network */ | ||
#define ENOPKG 65 /* Package not installed */ | ||
#define EREMOTE 66 /* Object is remote */ | ||
#define ENOLINK 67 /* Link has been severed */ | ||
#define EADV 68 /* Advertise error */ | ||
#define ESRMNT 69 /* Srmount error */ | ||
#define ECOMM 70 /* Communication error on send */ | ||
#define EPROTO 71 /* Protocol error */ | ||
#define EMULTIHOP 72 /* Multihop attempted */ | ||
#define EDOTDOT 73 /* RFS specific error */ | ||
#define EBADMSG 74 /* Not a data message */ | ||
#define EOVERFLOW 75 /* Value too large for defined data type */ | ||
#define ENOTUNIQ 76 /* Name not unique on network */ | ||
#define EBADFD 77 /* File descriptor in bad state */ | ||
#define EREMCHG 78 /* Remote address changed */ | ||
#define ELIBACC 79 /* Can not access a needed shared library */ | ||
#define ELIBBAD 80 /* Accessing a corrupted shared library */ | ||
#define ELIBSCN 81 /* .lib section in a.out corrupted */ | ||
#define ELIBMAX 82 /* Attempting to link in too many shared libraries */ | ||
#define ELIBEXEC 83 /* Cannot exec a shared library directly */ | ||
#define EILSEQ 84 /* Illegal byte sequence */ | ||
#define ERESTART 85 /* Interrupted system call should be restarted */ | ||
#define ESTRPIPE 86 /* Streams pipe error */ | ||
#define EUSERS 87 /* Too many users */ | ||
#define ENOTSOCK 88 /* Socket operation on non-socket */ | ||
#define EDESTADDRREQ 89 /* Destination address required */ | ||
#define EMSGSIZE 90 /* Message too long */ | ||
#define EPROTOTYPE 91 /* Protocol wrong type for socket */ | ||
#define ENOPROTOOPT 92 /* Protocol not available */ | ||
#define EPROTONOSUPPORT 93 /* Protocol not supported */ | ||
#define ESOCKTNOSUPPORT 94 /* Socket type not supported */ | ||
#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */ | ||
#define EPFNOSUPPORT 96 /* Protocol family not supported */ | ||
#define EAFNOSUPPORT 97 /* Address family not supported by protocol */ | ||
#define EADDRINUSE 98 /* Address already in use */ | ||
#define EADDRNOTAVAIL 99 /* Cannot assign requested address */ | ||
#define ENETDOWN 100 /* Network is down */ | ||
#define ENETUNREACH 101 /* Network is unreachable */ | ||
#define ENETRESET 102 /* Network dropped connection because of reset */ | ||
#define ECONNABORTED 103 /* Software caused connection abort */ | ||
#define ECONNRESET 104 /* Connection reset by peer */ | ||
#define ENOBUFS 105 /* No buffer space available */ | ||
#define EISCONN 106 /* Transport endpoint is already connected */ | ||
#define ENOTCONN 107 /* Transport endpoint is not connected */ | ||
#define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */ | ||
#define ETOOMANYREFS 109 /* Too many references: cannot splice */ | ||
#define ETIMEDOUT 110 /* Connection timed out */ | ||
#define ECONNREFUSED 111 /* Connection refused */ | ||
#define EHOSTDOWN 112 /* Host is down */ | ||
#define EHOSTUNREACH 113 /* No route to host */ | ||
#define EALREADY 114 /* Operation already in progress */ | ||
#define EINPROGRESS 115 /* Operation now in progress */ | ||
#define ESTALE 116 /* Stale file handle */ | ||
#define EUCLEAN 117 /* Structure needs cleaning */ | ||
#define ENOTNAM 118 /* Not a XENIX named type file */ | ||
#define ENAVAIL 119 /* No XENIX semaphores available */ | ||
#define EISNAM 120 /* Is a named type file */ | ||
#define EREMOTEIO 121 /* Remote I/O error */ | ||
#define EDQUOT 122 /* Quota exceeded */ | ||
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#define ENOMEDIUM 123 /* No medium found */ | ||
#define EMEDIUMTYPE 124 /* Wrong medium type */ | ||
#define ECANCELED 125 /* Operation Canceled */ | ||
#define ENOKEY 126 /* Required key not available */ | ||
#define EKEYEXPIRED 127 /* Key has expired */ | ||
#define EKEYREVOKED 128 /* Key has been revoked */ | ||
#define EKEYREJECTED 129 /* Key was rejected by service */ | ||
#define EOWNERDEAD 130 /* Owner died */ | ||
#define ENOTRECOVERABLE 131 /* State not recoverable */ | ||
#define ERFKILL 132 /* Operation not possible due to RF-kill */ | ||
#define EHWPOISON 133 /* Memory page has hardware error */ | ||
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#endif | ||
``` | ||
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