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#pragma once
// Kernel virtual memory region allocator
#include <sys.h>
#include <paging.h>
// Region types
#define REGION_T_KERNEL_BASE 0x00000001 // base kernel code & data
#define REGION_T_DESCRIPTORS 0x00000002 // contains more region descriptors
#define REGION_T_PAGETABLE 0x00000010 // used to map a page table/page directory
#define REGION_T_CORE_HEAP 0x00000100 // used for the core kernel heap
#define REGION_T_PROC_HEAP 0x00000200 // used for a kernel process' heap
#define REGION_T_CACHE 0x00001000 // used for cache
#define REGION_T_HW 0x00002000 // used for hardware access
struct region_info;
typedef void (*page_fault_handler_t)(pagedir_t *pd, struct region_info *r, size_t addr);
typedef struct region_info {
size_t addr, size;
uint32_t type;
page_fault_handler_t pf;
} region_info_t;
void region_allocator_init(void* kernel_data_end);
size_t region_alloc(size_t size, uint32_t type, page_fault_handler_t pf); // returns 0 on error
region_info_t *find_region(size_t addr);
void region_free(size_t addr);
#define N_PAGES_IN_PT_REGION 4
// special call for use by paging code
// allocates a region of N_PAGES_IN_PT_REGION pages
size_t region_alloc_for_pt();
void dbg_print_region_stats();
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