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docs: documented process memory isolation implementation

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antifallobst 2023-03-07 20:43:39 +01:00
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.wiki/Kernel-documentation.md
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@ -876,6 +876,35 @@ If **_divisor_** is smaller than 100, it will be set to 100.
## mm
### region.h
The first 4 digits can be ignored, they are ignored by the MMU,
but for clarity / readability reasons they are `FFFF` in the kernel space.
See _General Concepts / Memory Layout_ and _General Concepts / Process Memory Isolation_ for more details.
| Name | Start | Description |
|----------------------------------|--------------------|-------------------------------------------------------------------------|
| `MEM_REGION_PROCESS` | 0x0000000000000000 | This is the start of the process space |
| `MEM_REGION_PROCESS_EXEC` | 0x0000010000000000 | Every processes' executable will be mapped here |
| `MEM_REGION_PROCESS_THREAD_DATA` | 0x0000010100000000 | The start of the thread specific data ( -> _Process Memory Isolation_ ) |
| `MEM_REGION_KERNEL` | 0xFFFF800000000000 | This is the start of the kernel space |
| `MEM_REGION_KERNEL_EXEC` | 0xFFFFFFFF80000000 | The kernel executable is mapped here |
| `MEM_REGION_KERNEL_HEAP` | 0xFFFFFFFFF0000000 | The kernels' heap begins here |
#### `KERNEL_START_ADDRESS` - macro
Returns the address of `_kernel_start`.
#### `KERNEL_END_ADDRESS` - macro
Returns the address of `_kernel_end`.
#### `_kernel_start` - global variable
This symbol is inserted by the linker at the beginning of the kernel.
To access its value use the `KERNEL_START_ADDRESS` macro.
#### `_kernel_end` - global variable
This symbol is inserted by the linker at the end of the kernel.
To access its value use the `KERNEL_END_ADDRESS` macro.
### heap.h
#### `heap_segment_T` - struct
@ -1219,8 +1248,8 @@ Thread schematics (schedulers view):
#### `thread_T` - struct
| Name | Type | Description |
|-------------|-------------|--------------------------------------------------------------------------------------------------|
| state | cpu_state_T | The last saved state of the thread. ( -> _context switching_) |
|-------------|--------------|--------------------------------------------------------------------------------------------------|
| state | cpu_state_T* | The last saved state of the thread ( -> _context switching_) |
| cpu_time | uint64_t | The amount of cpu time the thread had. (currently the amount of context switches the thread had) |
| stack | void* | The bottom of the threads stack |
| stack_size | uint32_t | The size of the threads stack (in bytes) |