mirror of https://github.com/tailix/libkernaux.git
105 lines
2.5 KiB
Markdown
105 lines
2.5 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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* [Discussion](#discussion)
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API
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---
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* [Architecture-specific helpers](/include/kernaux/arch/)
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* [stdlib replacement](/include/kernaux/stdlib.h) (with prefix):
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* `NULL`
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* `bool`, `FALSE`, `TRUE`
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* `memset`
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* `strlen`
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* `strncpy`
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* `itoa` *(incomplete)*
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* [Multiboot 2 (GRUB 2) information parser](/include/kernaux/multiboot2.h)
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* [Page Frame Allocator](/include/kernaux/pfa.h) *(work in progress)*
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Tips
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----
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Create configuration script with `./autogen.sh`.
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Configure with cross-compiler in `$PATH` to make without it in `$PATH`:
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```
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./configure \
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--host=i686-elf \
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AR="$(which i686-elf-ar)" \
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CC="$(which i686-elf-gcc)" \
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RANLIB="$(which i686-elf-ranlib)" \
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CFLAGS='-ffreestanding -nostdinc -nostdlib -fno-builtin -fno-stack-protector'
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```
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To install into specific directory use full path:
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`DESTDIR="$(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-libLIBRARIES`
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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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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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