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docs: update changelog for 0.13.0

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Michael Scire 2020-06-14 22:42:36 -07:00
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# Changelog
## 0.13.0
+ `exosphère`, atmosphère's secure monitor re-implementation, was completely re-written.
+ `exosphère` was the first component authored for the project in early 2018. It is written in C, and in a style very different from the rest of atmosphère's code.
+ This has made the codebase difficult to maintain as time has gone on.
+ `exosphère` was also written to conform to constraints and assumptions that simply no longer apply when cfw is not launched from the web browser, and when warmboothax is possible.
+ Even beyond these issues, `exosphère` used all but 1KB of the 64KB of space available to it. This was a problem for a few reasons:
+ Each new system update added requires additional space to support (to add new keys and reflect various changes); 10.0.0 support used up 3 of the 4KB we had left.
+ atmosphère will want to have software support for mariko hardware, and this is not possible to fit in 1 KB.
+ The `exosphère` rewrite (which was codenamed `exosphère2` during development) solves these problems.
+ The new codebase is C++20 written in atmosphère's style.
+ This solves the maintainability problem, and should make understanding how the secure monitor works *much* easier for those interested in using the code as a reference implementation.
+ In addition, the new implementation currently uses ~59.5 of the 64KB available.
+ Several potential code changes are planned that can save/grant access to an additional ~2-3 KB if needed.
+ Unlike the first codebase, the new `exosphère` actually already has space allocated for future keys/etc. It is currently expected that the reserved space will never be required.
+ The previous implementation chose not to implement a number of "unimportant" secure monitor functions due to space concerns. The new code has enough breathing room that it can implement them without worries. :)
+ Finally, the groundwork for mariko support has been laid -- there are only a few minor changes needed for the new secure monitor implementation to work on both erista and mariko hardware.
+ **Please note**: `exosphère` is only one of many components, and many more need changes to support running on mariko hardware.
+ Software-side support for executing on mariko hardware is expected some time during Summer 2020, though it should also be noted that this is not a hard deadline.
+ **Please note**: The new `exosphère` binary is not abi-compatible with the old one. Users who boot using hekate should wait for it to update before running 0.13.0 (or boot fusee-primary via hekate).
+ atmosphère's api for target firmware was changed. All minor/micro system versions are now recognized, instead of only major versions.
+ This was required in order to support firmware version 5.1.0, which made breaking changes to certain IPC APIs that caused atmosphère 0.12.0 to abort.
+ **Please note**: this is (unavoidably) a breaking change. System modules using atmosphere-libs will need to update to understand what firmware version they are running.
+ For those interested in atmosphère's future development plans, the project's [roadmap](https://github.com/Atmosphere-NX/Atmosphere/blob/f68d33b70aed8954cc2c539e5934bcaf37ba51da/docs/roadmap.md) was updated.
+ General system stability improvements to enhance the user's experience.
## 0.12.0
+ Configuration for exosphere was moved to sd:/exosphere.ini.