2.4 KiB
2.4 KiB
| title | summary |
|---|---|
| region.h | virtual memory space layout |
The first 4 digits of an address can be ignored, they are also ignored by the MMU,
but for clarity / readability reasons they are FFFF in the kernel space.
See General Concepts / Memory Layout(todo: add reference) and General Concepts / Process Memory Isolation(todo: add reference) 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_BASE |
0x0000010100000000 | The start of the Thread Data regions |
MEM_REGION_KERNEL |
0xFFFF800000000000 | This is the start of the kernel space |
MEM_REGION_KERNEL_STACK_DUMMY |
0xFFFFF00000000000 | This area is used when preparing a threads' stack |
MEM_REGION_KERNEL_HEAP |
0xFFFFF80000000000 | The kernels' heap begins here |
MEM_REGION_KERNEL_THREAD_BASE |
0xFFFFFF0000000000 | The kernel processes' Thread Data regions |
MEM_REGION_KERNELEXEC |
0xFFFFFFFF80000000 | The kernel executable is mapped here |
MEM_REGION_THREAD_OFFSET - macro
This time the threads id specifies its offset in its processes' Thread Data region.
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 KERNEL_START_ADDRESS.
_kernel_end - global variable
This symbol is inserted by the linker at the end of the kernel. To access its value use KERNEL_END_ADDRESS.