pmm.inc

Our PMM is just a linked list of page-aligned size blocks.

┌─────┐      ┌─────┐
│size │  ┌──►│size │
│next ├──┘   │next ├────► 0
└─────┘      └─────┘

Summary

pmm.inc	Our PMM is just a linked list of page-aligned size blocks.
Constants
PMM_VIRT_TEMP
Macros
PAGE_ALIGN_UP reg
PAGE_ALIGN_DOWN reg
Structs
PMMFreeRange
Functions
_pmm_map_temp_page	Map physical address at PMM_VIRT_TEMP
_pmm_unmap_temp_page	Unmap PMM_VIRT_TEMP
_pmm_init_region	Add new memory region to the linked list.
_pmm_init_low_memory	Initialize bitmap for lower memory (below 1Mb)
_pmm_merge_block
pmm_alloc
pmm_alloc_page
pmm_free
pmm_free_page
pmm_init
Variables
pPMMFreeListHead	Hold first free list entry physical address

Map physical address at PMM_VIRT_TEMP

EAX	Physical address

Add new memory region to the linked list.

EAX	Start
EDX	End

Initialize bitmap for lower memory (below 1Mb)

EAX	size in page

EAX	first page physical address, 0 on error
EDX	error code

EAX	page physical address, 0 on error
EDX	error code

EAX	Start
EDX	Page count

EAX	Physical address

EAX	return -1 on error

Hold first free list entry physical address