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Finalize buddy system for physical allocator

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This commit is contained in:
Baptiste Wicht 2014-02-07 22:55:46 +01:00
parent c207fc8892
commit da9f0470ee
1 changed files with 17 additions and 4 deletions
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21
kernel/src/physical_allocator.cpp
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@ -36,12 +36,13 @@ size_t array_size(size_t managed_space, size_t block){
uint64_t* create_array(size_t managed_space, size_t block){
auto size = array_size(managed_space, block) * sizeof(uint64_t);
auto pages = size % paging::PAGE_SIZE == 0 ? size / paging::PAGE_SIZE : size / paging::PAGE_SIZE + 1;
auto physical_address = current_mmap_entry_position;
allocated_memory += size;
current_mmap_entry_position += size;
allocated_memory += pages * paging::PAGE_SIZE;
current_mmap_entry_position += pages * paging::PAGE_SIZE;
auto pages = size / paging::PAGE_SIZE + 1;
auto virtual_address = virtual_allocator::allocate(pages);
thor_assert(paging::map_pages(virtual_address, physical_address, pages), "Impossible to map pages for the physical allocator");
@ -93,6 +94,12 @@ void physical_allocator::init(){
auto size = current_mmap_entry->size;
auto managed_space = size - (current_mmap_entry_position - current_mmap_entry->base);
//Make sure to start with an aligned address
if((current_mmap_entry_position % paging::PAGE_SIZE) != 0){
allocated_memory += current_mmap_entry_position % paging::PAGE_SIZE;
current_mmap_entry_position = current_mmap_entry_position + current_mmap_entry_position % paging::PAGE_SIZE;
}
auto data_bitmap_1 = create_array(managed_space, 1);
auto data_bitmap_2 = create_array(managed_space, 2);
auto data_bitmap_4 = create_array(managed_space, 4);
@ -116,6 +123,8 @@ void physical_allocator::init(){
allocator.init<6>(array_size(managed_space, 64), data_bitmap_64);
allocator.init<7>(array_size(managed_space, 128), data_bitmap_128);
allocator.init();
//TODO The current system uses more memory than necessary,
//because it also tries to index memory that is used for the
//buddy system.
@ -128,7 +137,11 @@ size_t physical_allocator::allocate(size_t blocks){
allocated_memory += buddy_type::level_size(blocks) * unit;
return allocator.allocate(blocks);
auto block = allocator.allocate(blocks);
k_print_line(block);
return block;
}
size_t physical_allocator::available(){