/* | |
FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
This file is part of the FreeRTOS distribution. | |
FreeRTOS is free software; you can redistribute it and/or modify it under | |
the terms of the GNU General Public License (version 2) as published by the | |
Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception. | |
*************************************************************************** | |
>>! NOTE: The modification to the GPL is included to allow you to !<< | |
>>! distribute a combined work that includes FreeRTOS without being !<< | |
>>! obliged to provide the source code for proprietary components !<< | |
>>! outside of the FreeRTOS kernel. !<< | |
*************************************************************************** | |
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY | |
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
FOR A PARTICULAR PURPOSE. Full license text is available on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
1 tab == 4 spaces! | |
*/ | |
/* Set to 1 to enable functionality */ | |
#define __SHOW_KERNEL_PARAMS__ 0 | |
/* Local definitions boot loader */ | |
#define MULTIBOOT_SIGNATURE 0x2BADB002 | |
#define MULTIBOOT_BOOTINFO_MMAP 0x00000040 | |
/* Local definitions for GD table */ | |
#define GDT_ENTRIES 8 | |
#define GDT_ENTRY_SIZE 8 | |
#define GDT_BYTES (GDT_ENTRIES * GDT_ENTRY_SIZE) | |
/* Globals and externs */ | |
.global _mboot_hdr | |
.global _start | |
.global _restart | |
.extern bootsign | |
.extern bootinfo | |
.extern __text_start | |
.extern __text_end | |
.extern __data_vma | |
.extern __data_lma | |
.extern __data_start | |
.extern __data_end | |
.extern __bss_start | |
.extern __bss_end | |
.extern __stack_for_main | |
.global __text_start | |
.global __text_end | |
.global __data_vma | |
.global __data_lma | |
.global __data_start | |
.global __data_end | |
.global __bss_start | |
.global __bss_end | |
.extern setsegs | |
.extern CRT_Init | |
.extern kernel_load_check | |
.extern main | |
/* Local constants for multiboot section */ | |
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */ | |
.set MEMINFO, 1<<1 /* provide memory map */ | |
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */ | |
.set FLAGS, ALIGN|MEMINFO /* this is the multiboot 'flag' field */ | |
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above */ | |
/* Set-up GDT */ | |
.section .data | |
.align 16 | |
.globl gdt | |
gdt: .space GDT_BYTES | |
gdtr: .word (GDT_BYTES-1) /* sizeof _gdt -1 (in bytes) */ | |
.long gdt /* global pointer to the gdt */ | |
/* Start of application text */ | |
.section .text.entry | |
/* Skip mb header */ | |
jmp _start | |
.align 4 | |
/* Multiboot header */ | |
_mboot_hdr: | |
.long MAGIC /* offset = 0 */ | |
.long FLAGS /* offset = 4 */ | |
.long CHECKSUM /* offset = 8 */ | |
.long _mboot_hdr /* should be header address - offset = 12 */ | |
.long __text_start /* load address (start of text) - offset = 16 */ | |
.long __bss_start /* load end address (end of data) - offset = 20*/ | |
.long __bss_end /* bss end address - offset = 24*/ | |
.long _start /* entry_addr - offset = 28*/ | |
/* Start of executable code */ | |
_start: | |
/* Store boot arguments */ | |
movl %eax, bootsign | |
movl %ebx, bootinfo | |
/* Check to see if kernel is bootstrapped by grub */ | |
cmpl $MULTIBOOT_SIGNATURE, %eax | |
jne _local_loop | |
testb $MULTIBOOT_BOOTINFO_MMAP, (%ebx) | |
je _local_loop | |
_restart: | |
/* Initialise the stack pointer */ | |
movl $__stack_for_main, %esp | |
/* Reset EFLAGS. */ | |
pushl $0 | |
popf | |
/* Set up the global descriptor table */ | |
call setsegs | |
lgdt gdtr | |
ljmp $0x8, $gdt1 /* CS descriptor 1 */ | |
gdt1: | |
movl $0x10, %eax /* DS descriptor 2 */ | |
movw %ax, %ds | |
movw %ax, %es | |
movw %ax, %fs | |
movw %ax, %gs | |
movl $0x18, %eax /* SS descriptor 3 */ | |
movw %ax, %ss | |
/* Clear interrupt flag */ | |
cli | |
/* Initialise platform */ | |
call CRT_Init | |
/* Show kernel parameters and call main, or just call main */ | |
#if (__SHOW_KERNEL_PARAMS__ == 1) | |
/*--------------------------------------------------------------------- | |
On successful OS load EAX should contain 0x2BADB002 | |
EBX should contain the physical address of multiboot info structure | |
Push the pointers to the multiboot information structure | |
and the magic number on the stack and check values returned | |
----------------------------------------------------------------------*/ | |
movl bootsign, %eax | |
movl bootinfo, %ebx | |
pushl %ebx /* Multiboot information */ | |
pushl %eax /* Magic number */ | |
call show_kernel_parameters | |
#else | |
/*--------------------------------------------------------------------- | |
Call main() routine | |
----------------------------------------------------------------------*/ | |
call main | |
#endif | |
/* Should not get here, but just in case - loop forever */ | |
cli | |
_local_loop: | |
hlt | |
jmp _local_loop | |
/*------------------------------------------------------------------------- | |
GLOBAL ASSEMBLY LANGUAGE ROUTINES | |
--------------------------------------------------------------------------*/ | |
/* halt */ | |
.globl halt | |
halt: | |
jmp halt | |
ret | |
/* inb */ | |
.globl inb | |
inb: movl 4(%esp), %edx | |
xorl %eax, %eax # clr eax | |
inb %dx, %al | |
ret | |
/* inw */ | |
.globl inw | |
inw: movl 4(%esp), %edx | |
xorl %eax, %eax # clr eax | |
inw %dx, %ax | |
ret | |
/* inl */ | |
.globl inl | |
inl: movl 4(%esp), %edx | |
xorl %eax, %eax | |
inl %dx, %eax | |
ret | |
/* outb */ | |
.globl outb | |
outb: movl 4(%esp), %edx | |
movl 8(%esp), %eax | |
outb %al, %dx | |
ret | |
/* outw */ | |
.globl outw | |
outw: movl 4(%esp), %edx | |
movl 8(%esp), %eax | |
outw %ax, %dx | |
ret | |
/* outl */ | |
.globl outl | |
outl: movl 4(%esp), %edx | |
movl 8(%esp), %eax | |
outl %eax, %dx | |
ret | |
.end |