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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_CORE_HEAP 0x00000100 // used for the core kernel heap
#define REGION_T_KPROC_HEAP 0x00000200 // used for a kernel process' heap
#define REGION_T_KPROC_STACK 0x00000400 // used for a kernel process' heap
#define REGION_T_PROC_KSTACK 0x00000800 // used for a process' kernel 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, void* addr);
typedef struct region_info {
void* addr;
size_t size;
uint32_t type;
page_fault_handler_t pf;
} region_info_t;
void region_allocator_init(void* kernel_data_end);
void* region_alloc(size_t size, uint32_t type, page_fault_handler_t pf); // returns 0 on error
region_info_t *find_region(void* addr);
void region_free(void* addr);
// some usefull PF handlers
// stack_pf_handler : allocates new frames and panics on access to first page of region (stack overflow)
void stack_pf_handler(pagedir_t *pd, struct region_info *r, void* addr);
// default_allocator_pf_handler : just allocates new frames on page faults
void default_allocator_pf_handler(pagedir_t *pd, struct region_info *r, void* addr);
// some functions for freeing regions and frames
// region_free_unmap_free : deletes a region and frees all frames that were mapped in it
void region_free_unmap_free(void* addr);
// region_free_unmap : deletes a region and unmaps all frames that were mapped in it, without freeing them
void region_free_unmap(void* addr);
void dbg_print_region_stats();
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