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#ifndef APOS_MEM_REGIONS_H
#define APOS_MEM_REGIONS_H
/**
* @file mem_regions.h
* Memory region subsytem. Mainly used by the virtual memory subsytems, i.e. device and
* user memory.
*/
#include <apos/mem.h>
#include <apos/types.h>
#include <apos/sp_tree.h>
#include <arch/vmem.h>
#define mem_container(ptr) container_of(ptr, struct mem_region, sp_n)
#define is_region_used(r) is_set(r->flags, MR_USED)
#define is_region_owned(r) is_set(r->flags, MR_OWNED)
#define is_region_shared(r) is_set(r->flags, MR_SHARED)
#define is_region_kept(r) is_set(r->flags, MR_KEEP)
struct mem_region_root {
struct sp_root free_regions;
struct sp_root used_regions;
};
struct mem_region {
struct sp_node sp_n;
struct mem_region *next;
struct mem_region *prev;
vmflags_t flags;
vm_t end;
vm_t start;
};
stat_t init_region(struct mem_region_root *r, vm_t start, size_t arena_size);
stat_t destroy_region(struct mem_region_root *r);
vm_t alloc_region(struct mem_region_root *r, size_t size, size_t *actual_size,
vmflags_t flags);
vm_t alloc_fixed_region(struct mem_region_root *r, vm_t start, size_t size,
size_t *actual_size, vmflags_t flags);
stat_t free_region(struct mem_region_root *r, vm_t start);
stat_t free_known_region(struct mem_region_root *r, struct mem_region *m);
struct mem_region *find_first_region(struct mem_region_root *r);
struct mem_region *find_used_region(struct mem_region_root *r, vm_t start);
struct mem_region *find_closest_used_region(struct mem_region_root *r,
vm_t start);
struct mem_region *find_free_region(struct mem_region_root *r, size_t size,
size_t *align);
/**
* Helper functions for converting between memory regions and page
* mappings. Called by \ref map_fill_region().
* \see map_fill_region() for further explanation.
*
* @param vmem Virtual memory space in which the operation is to be done.
* @param offset Offset from where to start looking for next physical page. \see
* alloc_page().
* @param vaddr Current virtual address.
* @param flags Virtual memory allocation flags.
* @param order Order of physical page.
* @param data Custom data.
* @return \ref OK if succesful, \c INFO_TRGN if page order should be decreased,
* anything else means error.
*/
typedef stat_t region_callback_t(struct vmem *vmem, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order,
void *data);
stat_t stat_region(struct mem_region_root *r, vm_t va, vmflags_t *flags);
stat_t mod_region(struct mem_region_root *r, vm_t va, vmflags_t flags);
vm_t map_fill_region(struct vmem *b, region_callback_t *mem_handler,
pm_t offset, vm_t start, size_t bytes, vmflags_t flags,
void *data);
#endif /* APOS_MEM_REGIONS_H */
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