fox32os: Initial commit
Ry
commit
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MIT License
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Copyright (c) 2022 ryfox/ry755
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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demo fxf
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#!/bin/bash
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set -e
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mkdir -p base_image
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# if fox32os.img doesn't exist, then create it
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if [ ! -f fox32os.img ]; then
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echo "fox32os.img not found, creating it"
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build/ryfs/ryfs.py -s 16777216 -l fox32os create fox32os.img
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fi
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echo "assembling kernel"
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../fox32asm/target/release/fox32asm kernel/main.asm base_image/system.bin
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echo "adding files to fox32os.img"
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cd base_image
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for file in "./*"; do
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../build/ryfs/ryfs.py add ../fox32os.img $file
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done
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Subproject commit a1f18bbc3c8891f98f98fb915fb2551af1ef6477
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; memory allocator routines
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; this is a very basic memory allocator, it doesn't even allow freeing
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; TODO: make this better
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const MEMORY_TOP: 0x02000000
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; allocate a block of memory
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; inputs:
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; r0: size in bytes
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; outputs:
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; r0: pointer to allocated block (or zero if no blocks free)
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allocate_memory:
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push r1
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push r2
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mov r1, MEMORY_TOP
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mov r2, [free_base]
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sub r1, r2
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cmp r1, r0
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iflteq jmp allocate_memory_full
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mov r1, [free_base]
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add [free_base], r0
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mov r0, r1
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pop r2
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pop r1
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ret
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allocate_memory_full:
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mov r0, 0
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pop r2
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pop r1
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ret
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free_base: data.32 kernel_bottom
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| Byte Range | Description |
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| :-------------------: | -------------------------- |
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| 0x00000000-0x00000002 | "FXF" magic bytes |
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| 0x00000003 | header version (must be 0) |
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| 0x00000004-0x00000007 | code size |
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| 0x00000008-0x0000000B | pointer to code |
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| 0x0000000C-0x0000000F | `extern` table size |
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| 0x00000010-0x00000013 | pointer to `extern` table |
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| 0x00000014-0x00000017 | `global` table size |
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| 0x00000018-0x0000001B | pointer to `global` table |
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| 0x0000001C-0x0000001F | reloc table size |
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| 0x00000020-0x00000023 | pointer to reloc table |
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; FXF routines
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; parse and relocate an FXF binary loaded in memory
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; inputs:
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; r0: pointer to memory buffer containing an FXF binary
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; outputs:
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; none
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execute_fxf_binary:
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; TODO: check the magic bytes and header version
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call fxf_reloc
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jmp r0
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#include "fxf/reloc.asm"
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const FXF_CODE_SIZE: 0x00000004
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const FXF_CODE_PTR: 0x00000008
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const FXF_EXTERN_SIZE: 0x0000000C
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const FXF_EXTERN_PTR: 0x00000010
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const FXF_GLOABL_SIZE: 0x00000014
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const FXF_GLOBAL_PTR: 0x00000018
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const FXF_RELOC_SIZE: 0x0000001C
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const FXF_RELOC_PTR: 0x00000020
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; FXF relocation routines
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; relocate a FXF binary
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; inputs:
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; r0: pointer to memory buffer containing a FXF binary
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; outputs:
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; r0: relocation address
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fxf_reloc:
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push r1
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push r2
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push r3
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push r4
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push r5
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; calculate relocation address
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mov r5, r0
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add r5, FXF_CODE_PTR
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mov r5, [r5]
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add r5, r0
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; get the number of entries in the reloc table
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mov r1, r0
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add r1, FXF_RELOC_SIZE
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mov r1, [r1]
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div r1, 4
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mov r31, r1
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; get the pointer to the table
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mov r1, r0
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add r1, FXF_RELOC_PTR
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mov r1, [r1]
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add r1, r0
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; get the pointer to the code
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mov r2, r0
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add r2, FXF_CODE_PTR
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mov r2, [r2]
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add r2, r0
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; loop over the reloc table entries and relocate the code
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fxf_reloc_loop:
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; get the reloc table entry
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mov r3, [r1]
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; point to the location in the code
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mov r4, r2
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add r4, r3
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; relocate
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add [r4], r5
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; increment the reloc table pointer
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add r1, 4
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loop fxf_reloc_loop
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; return relocation address
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mov r0, r5
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pop r5
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pop r4
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pop r3
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pop r2
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pop r1
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ret
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; fox32os kernel
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org 0x00000800
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const FOX32OS_VERSION_MAJOR: 0
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const FOX32OS_VERSION_MINOR: 1
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const FOX32OS_VERSION_PATCH: 0
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const BACKGROUND_COLOR: 0xFF674764
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const TEXT_COLOR: 0xFFFFFFFF
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; initialization code
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entry:
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; clear the background
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mov r0, BACKGROUND_COLOR
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call fill_background
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draw_startup_text:
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mov r0, startup_str
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mov r1, 16
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mov r2, 464
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mov r3, TEXT_COLOR
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mov r4, 0x00000000
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mov r10, FOX32OS_VERSION_MAJOR
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mov r11, FOX32OS_VERSION_MINOR
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mov r12, FOX32OS_VERSION_PATCH
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call draw_format_str_to_background
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; open startup.cfg
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mov r0, startup_file
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mov r1, 0
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mov r2, startup_file_struct
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call ryfs_open
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cmp r0, 0
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ifz jmp startup_error
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; load the first 11 bytes of startup.cfg, overwriting the "startup cfg" string
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mov r0, 11
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mov r1, startup_file_struct
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mov r2, startup_file
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call ryfs_read
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; open the actual startup file
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mov r0, startup_file
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mov r1, 0
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mov r2, startup_file_struct
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call ryfs_open
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cmp r0, 0
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ifz jmp startup_error
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; read the startup file into memory starting at the bottom of the kernel
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mov r0, startup_file_struct
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mov r1, kernel_bottom
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call ryfs_read_whole_file
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; relocate and execute it!!!
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mov r0, kernel_bottom
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call execute_fxf_binary
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rjmp 0
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startup_error:
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mov r0, startup_error_str
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mov r1, 16
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mov r2, 16
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mov r3, TEXT_COLOR
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mov r4, 0x00000000
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call draw_str_to_background
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rjmp 0
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#include "allocator.asm"
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#include "fxf/fxf.asm"
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startup_str: data.str "fox32 - OS version %u.%u.%u" data.8 0
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startup_file: data.str "startup cfg"
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startup_error_str: data.str "startup.cfg is invalid" data.8 0
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startup_file_struct: data.32 0 data.32 0
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#include "../../fox32rom/fox32rom.def"
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kernel_bottom:
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