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osd-contiki/platform/galileo/loader.S

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galileo: Initial support for Intel Galileo Platform This patch adds the initial support for Intel Galileo Platform. It contains the minimum set of code required to boot a dummy Contiki image. For Galileo initial support, we implemented a linker script, a minimal bootstrap code, a set of stubbed functions required by newlib, and a very simple main() function. Moreover, we also define some header files and macros required by Contiki. To build applications for this platform you should first build newlib (in case it wasn't already built). To build newlib you can run the following command: $ platform/galileo/bsp/libc/build_newlib.sh Once newlib is built, you can build applications. To build applications for Galileo platform you should set TARGET variable to 'galileo'. For instance, building the hello-world application should look like this: $ cd examples/hello-world/ && make TARGET=galileo This will generate the 'hello-world.galileo' file which is a multiboot- compliant [1] ELF image. This image can be booted by any multiboot- complaint bootloader such as Grub. Finally, this patch should be used as a guideline to add the initial support for others platforms based on x86 SoCs. [1] https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
2015-07-01 21:43:42 +02:00
/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
galileo: Add a bootstrap stack for C runtime All we need to provide to C at this point is a region in memory dedicated to its stack. This is done by allocating a region in .bss and pushing its start address to esp. Since the multiboot spec says it is not safe to rely on the initial stack provided by the bootloader, this patch provides our own stack. Galileo boards have 512Kb of SRAM and 256Mb of DDR3 RAM, so providing 8kb as a start seems safe. Moreover, stack sizes are very application-oriented so it may be too early to provide a bigger (or smaller) stack.
2015-03-16 14:39:13 +01:00
# Kernel
.set STACK_SIZE, 8192
# Multiboot
galileo: Initial support for Intel Galileo Platform This patch adds the initial support for Intel Galileo Platform. It contains the minimum set of code required to boot a dummy Contiki image. For Galileo initial support, we implemented a linker script, a minimal bootstrap code, a set of stubbed functions required by newlib, and a very simple main() function. Moreover, we also define some header files and macros required by Contiki. To build applications for this platform you should first build newlib (in case it wasn't already built). To build newlib you can run the following command: $ platform/galileo/bsp/libc/build_newlib.sh Once newlib is built, you can build applications. To build applications for Galileo platform you should set TARGET variable to 'galileo'. For instance, building the hello-world application should look like this: $ cd examples/hello-world/ && make TARGET=galileo This will generate the 'hello-world.galileo' file which is a multiboot- compliant [1] ELF image. This image can be booted by any multiboot- complaint bootloader such as Grub. Finally, this patch should be used as a guideline to add the initial support for others platforms based on x86 SoCs. [1] https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
2015-07-01 21:43:42 +02:00
.set MAGIC_NUMBER, 0x1BADB002
.set FLAGS, 0x0
.set CHECKSUM, -MAGIC_NUMBER
.section .multiboot
.align 4
.long MAGIC_NUMBER
.long FLAGS
.long CHECKSUM
galileo: Add a bootstrap stack for C runtime All we need to provide to C at this point is a region in memory dedicated to its stack. This is done by allocating a region in .bss and pushing its start address to esp. Since the multiboot spec says it is not safe to rely on the initial stack provided by the bootloader, this patch provides our own stack. Galileo boards have 512Kb of SRAM and 256Mb of DDR3 RAM, so providing 8kb as a start seems safe. Moreover, stack sizes are very application-oriented so it may be too early to provide a bigger (or smaller) stack.
2015-03-16 14:39:13 +01:00
# Reserve space for the C stack.
.lcomm c_stack, STACK_SIZE
galileo: Initial support for Intel Galileo Platform This patch adds the initial support for Intel Galileo Platform. It contains the minimum set of code required to boot a dummy Contiki image. For Galileo initial support, we implemented a linker script, a minimal bootstrap code, a set of stubbed functions required by newlib, and a very simple main() function. Moreover, we also define some header files and macros required by Contiki. To build applications for this platform you should first build newlib (in case it wasn't already built). To build newlib you can run the following command: $ platform/galileo/bsp/libc/build_newlib.sh Once newlib is built, you can build applications. To build applications for Galileo platform you should set TARGET variable to 'galileo'. For instance, building the hello-world application should look like this: $ cd examples/hello-world/ && make TARGET=galileo This will generate the 'hello-world.galileo' file which is a multiboot- compliant [1] ELF image. This image can be booted by any multiboot- complaint bootloader such as Grub. Finally, this patch should be used as a guideline to add the initial support for others platforms based on x86 SoCs. [1] https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
2015-07-01 21:43:42 +02:00
.section .text
.global start
start:
cli
galileo: Add a bootstrap stack for C runtime All we need to provide to C at this point is a region in memory dedicated to its stack. This is done by allocating a region in .bss and pushing its start address to esp. Since the multiboot spec says it is not safe to rely on the initial stack provided by the bootloader, this patch provides our own stack. Galileo boards have 512Kb of SRAM and 256Mb of DDR3 RAM, so providing 8kb as a start seems safe. Moreover, stack sizes are very application-oriented so it may be too early to provide a bigger (or smaller) stack.
2015-03-16 14:39:13 +01:00
movl $(c_stack + STACK_SIZE), %esp
galileo: Initial support for Intel Galileo Platform This patch adds the initial support for Intel Galileo Platform. It contains the minimum set of code required to boot a dummy Contiki image. For Galileo initial support, we implemented a linker script, a minimal bootstrap code, a set of stubbed functions required by newlib, and a very simple main() function. Moreover, we also define some header files and macros required by Contiki. To build applications for this platform you should first build newlib (in case it wasn't already built). To build newlib you can run the following command: $ platform/galileo/bsp/libc/build_newlib.sh Once newlib is built, you can build applications. To build applications for Galileo platform you should set TARGET variable to 'galileo'. For instance, building the hello-world application should look like this: $ cd examples/hello-world/ && make TARGET=galileo This will generate the 'hello-world.galileo' file which is a multiboot- compliant [1] ELF image. This image can be booted by any multiboot- complaint bootloader such as Grub. Finally, this patch should be used as a guideline to add the initial support for others platforms based on x86 SoCs. [1] https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
2015-07-01 21:43:42 +02:00
call main
galileo: Halt if main() returns This patch adds extra intrunctions to loader.S so we halt if main() returns.
2015-03-11 20:44:00 +01:00
/* We're not expected to return from main(). But if we do we halt */
x86: Add helpers.h This patch adds the helpers.h. This file should contain only x86-related helper functions and macros. For now, we define the BIT macro and halt() helpers which will be used in upcoming patches. Additionally, this patch also changes loader.S to call the halt().
2015-04-13 19:07:59 +02:00
call halt
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