mirror of https://github.com/tailix/libkernaux.git
174 lines
5.1 KiB
Markdown
174 lines
5.1 KiB
Markdown
libkernaux
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==========
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Auxiliary library for kernel development.
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Table of contents
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-----------------
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* [Overview](#libkernaux)
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* [Table of contents](#table-of-contents)
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* [API](#api)
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* [Tips](#tips)
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* [Compilation](#compilation)
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* [Cross-compilation](#cross-compilation)
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* [Portability](#portability)
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* [Discussion](#discussion)
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API
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---
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* [Measurement units utils](/include/kernaux/units.h) *(work in progress)*
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* [Simple command line parser](/include/kernaux/cmdline.h)
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* [Multiboot 2 (GRUB 2) information parser](/include/kernaux/multiboot2.h)
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* [Serial console](/include/kernaux/console.h)
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* [Page Frame Allocator](/include/kernaux/pfa.h) *(work in progress)*
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* [ELF utils](/include/kernaux/elf.h) *(work in progress)*
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* [Architecture-specific helpers](/include/kernaux/arch/)
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* [printf replacement](/include/kernaux/printf.h) *(work in progress)*
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* [stdlib replacement](/include/kernaux/stdlib.h):
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* `memset`
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* `strlen`
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* `strncpy`
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* `itoa` *(work in progress)*
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Tips
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----
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### Compilation
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```
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./autogen.sh
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./configure
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make
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sudo make install
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```
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You can test with `make check`.
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This is just a usual library. You can use most of it's APIs in hosted
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environment.
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### Cross-compilation
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Create configuration script with `./autogen.sh`.
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Configure with [cross-compiler](https://wiki.osdev.org/GCC_Cross-Compiler) in
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`$PATH` to make without it in `$PATH`:
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```
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./configure \
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--host='i386-elftailix' \
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AR="$(which i386-elftailix-ar)" \
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CC="$(which i386-elftailix-gcc)" \
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RANLIB="$(which i386-elftailix-ranlib)" \
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CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
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```
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You can see the following messages. It's
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[a bug](https://savannah.gnu.org/support/index.php?110393) in **autoconf**, just
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ignore it.
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```
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checking for _Bool... no
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checking stdarg.h usability... no
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checking stdarg.h presence... yes
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configure: WARNING: stdarg.h: present but cannot be compiled
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configure: WARNING: stdarg.h: check for missing prerequisite headers?
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configure: WARNING: stdarg.h: see the Autoconf documentation
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configure: WARNING: stdarg.h: section "Present But Cannot Be Compiled"
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configure: WARNING: stdarg.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
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configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
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configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stdarg.h... no
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checking stddef.h usability... no
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checking stddef.h presence... yes
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configure: WARNING: stddef.h: present but cannot be compiled
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configure: WARNING: stddef.h: check for missing prerequisite headers?
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configure: WARNING: stddef.h: see the Autoconf documentation
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configure: WARNING: stddef.h: section "Present But Cannot Be Compiled"
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configure: WARNING: stddef.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
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configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
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configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stddef.h... no
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```
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To install into specific directory use full path:
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`DESTDIR="$(pwd)/dest" make install` instead of `DESTDIR=dest make install`.
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When configured with cross-compiler, library can't be build and installed with
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just `make && sudo make install`. Instead use the following commands:
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* `make libkernaux.a`
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* `sudo make install-exec`
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* `sudo make install-data`
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Check if compilation targets i386: `objdump -d src/arch/i386.o`. It should
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output something like this:
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```
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src/arch/i386.o: file format elf32-i386
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Disassembly of section .text:
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00000000 <kernaux_arch_i386_hang>:
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0: fa cli
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1: f4 hlt
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2: eb fc jmp 0 <kernaux_arch_i386_hang>
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00000004 <kernaux_arch_i386_read_cr0>:
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4: 0f 20 c0 mov %cr0,%eax
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7: c3 ret
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00000008 <kernaux_arch_i386_read_cr4>:
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8: 0f 20 e0 mov %cr4,%eax
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b: c3 ret
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0000000c <kernaux_arch_i386_write_cr0>:
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c: 8b 44 24 04 mov 0x4(%esp),%eax
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10: 0f 22 c0 mov %eax,%cr0
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13: c3 ret
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00000014 <kernaux_arch_i386_write_cr3>:
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14: 8b 44 24 04 mov 0x4(%esp),%eax
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18: 0f 22 d8 mov %eax,%cr3
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1b: c3 ret
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0000001c <kernaux_arch_i386_write_cr4>:
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1c: 8b 44 24 04 mov 0x4(%esp),%eax
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20: 0f 22 e0 mov %eax,%cr4
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23: c3 ret
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```
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Portability
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-----------
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Except GNU/Linux, the library is periodically successfully built (starting with
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`./autogen.sh`) and tested with **autoconf**, **automake**, **binutils** and
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**gcc**/**clang** (depending on what is present) on the following operating
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systems:
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* FreeBSD 13.0
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* Minix 3.3.0
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* NetBSD 9.2
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* OpenBSD 7.0
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Discussion
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----------
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* [Topic on OSDev.org forum](https://forum.osdev.org/viewtopic.php?f=1&t=37958)
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* [Thread on r/osdev](https://www.reddit.com/r/osdev/comments/k3ueeu/libkernaux_auxiliary_library_for_kernel/)
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