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Fix broken link to ARMv8-A Programmer's Guide #240

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Fix broken link to ARMv8-A Programmer's Guide #240

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2 changes: 1 addition & 1 deletion docs/lesson01/rpi-os.md
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Expand Up @@ -223,7 +223,7 @@ For those of you who are not familiar with ARM assembler syntax, let me quickly
* [**bl**](http://www.keil.com/support/man/docs/armasm/armasm_dom1361289865686.htm) "Branch with a link": perform an unconditional branch and store the return address in x30 (the link register). When the subroutine is finished, use the `ret` instruction to jump back to the return address.
* [**mov**](http://www.keil.com/support/man/docs/armasm/armasm_dom1361289878994.htm) Move a value between registers or from a constant to a register.

[Here](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/index.html) is the ARMv8-A developer's guide. It's a good resource if the ARM ISA is unfamiliar to you. [This page](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/ch09s01s01.html) specifically outlines the register usage convention in the ABI.
[Here](https://developer.arm.com/documentation/den0024/a) is the ARMv8-A developer's guide. It's a good resource if the ARM ISA is unfamiliar to you. [This page](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/ch09s01s01.html) specifically outlines the register usage convention in the ABI.

### The `kernel_main` function

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