diff options
Diffstat (limited to 'kernel/include')
| -rw-r--r-- | kernel/include/paging.h | 6 | ||||
| -rw-r--r-- | kernel/include/region.h | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/kernel/include/paging.h b/kernel/include/paging.h index 720d6b3..44014a2 100644 --- a/kernel/include/paging.h +++ b/kernel/include/paging.h @@ -19,6 +19,12 @@ uint32_t pd_get_frame(void* vaddr); // get physical frame for virtual address int pd_map_page(void* vaddr, uint32_t frame_id, bool rw); // returns nonzero on error void pd_unmap_page(void* vaddr); // does nothing if page not mapped +// Note on concurrency : we expect that multiple threads will not try to map/unmap +// pages in the same region at the same time. It can nevertheless happen that +// several threads try to map pages that belong to the same 4M-section, and in that +// case both might require the allocation of a new PT at the same location. These +// cases are well-handled (the pagedir_t type contains a mutex used for this) + pagedir_t *create_pagedir(); // returns zero on error void delete_pagedir(pagedir_t *pd); diff --git a/kernel/include/region.h b/kernel/include/region.h index 5f44626..ac68047 100644 --- a/kernel/include/region.h +++ b/kernel/include/region.h @@ -2,6 +2,8 @@ // Kernel virtual memory region allocator +// This is entirely thread-safe + #include <sys.h> #include <paging.h> |