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* Large reorganization.Josh Rahm2020-11-22
| | | | | | | | | | | | | | | | | | | | | | What was in core/ is now moved to arch/stm34l4xxx/peripherals. This new directory is *supposed to* to contain raw header files defining just the pertinent register structures for the various peripherals. Peripheral management belongs somewhere in the new `kern/..` directories. This is not completely the case at the moment, so more refactoring needs to be done. What was sitting in the root has now been moved into the kern/ directory. The kern/ directory is to contain everything else other than raw device register definitions. The root of the kern/ tree is reserved for standard library-esque headers. The kern/<peripheral> directory contains management systems for that peripheral. (At the moment DMA is the only peripheral with a decent management system.) Preferably these peripheral systems should only include their correlating header in arch/stm34l4xxx/peripherals, and use other management systems for handling other peripherals rather than manipulating their raw registers directly. (Though this ideal will require much more critical mass of management systems.)
* Some comment-changes to mem.cJosh Rahm2020-11-21
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* Fix mem.c to use the address of DATA_SEGMENT_START instead of the valueJosh Rahm2020-11-21
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* Added halloc for allocating memory on the heap.Josh Rahm2020-11-21
| | | | | | | | | | | The new halloc() call allocates memory on the STM32l's SRAM2 starting right above the DATA section. The implementation uses a very-dense, albeit slower, linked-list allocation as opposed to fancy B-trees or something. However, the overhead is just 1 32-bit word per allocation and thus allows for reasonably dense memory-packing on the small 16K memory chip.
* Finally got a peripheral interrupt!Josh Rahm2020-11-20
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* Reorganize some file. Put thte core register libraries in a core/Josh Rahm2020-11-18
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* Got the DMA to send a simple message through UART2.Josh Rahm2020-11-16