1 /* 2 * Copyright 2014, Henry Harrington, henry.harrington@gmail.com. 3 * Copyright 2019-2022, Haiku, Inc. All rights reserved. 4 * Distributed under the terms of the MIT License. 5 */ 6 #ifndef MMU_H 7 #define MMU_H 8 9 10 #ifndef _ASSEMBLER 11 12 13 #include "efi_platform.h" 14 15 #include <util/FixedWidthPointer.h> 16 17 18 #ifdef __cplusplus 19 extern "C" { 20 #endif 21 22 static const uint32 kDefaultPageFlags = 0x3; 23 // present, R/W 24 static const uint64 kTableMappingFlags = 0x7; 25 // present, R/W, user 26 static const uint64 kLargePageMappingFlags = 0x183; 27 // present, R/W, user, global, large 28 static const uint64 kPageMappingFlags = 0x103; 29 // present, R/W, user, global 30 31 32 extern addr_t get_next_virtual_address(size_t size); 33 extern addr_t get_current_virtual_address(); 34 35 extern void mmu_init(); 36 37 extern phys_addr_t mmu_allocate_page(); 38 39 bool mmu_next_region(void** cookie, addr_t* vaddr, phys_addr_t* paddr, size_t* size); 40 41 extern addr_t mmu_map_physical_memory(addr_t physicalAddress, size_t size, 42 uint32 flags); 43 44 extern status_t platform_kernel_address_to_bootloader_address(addr_t address, 45 void **_result); 46 47 extern status_t platform_bootloader_address_to_kernel_address(void *address, 48 addr_t *_result); 49 50 extern status_t platform_allocate_lomem(void **_address, size_t size); 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 57 /*! Convert a 32-bit address to a 64-bit address. */ 58 inline addr_t 59 fix_address(addr_t address) 60 { 61 addr_t result; 62 if (platform_bootloader_address_to_kernel_address((void *)address, &result) 63 != B_OK) { 64 return address; 65 } else 66 return result; 67 } 68 69 70 template<typename Type> 71 inline void 72 fix_address(FixedWidthPointer<Type>& p) 73 { 74 if (p != NULL) 75 p.SetTo(fix_address(p.Get())); 76 } 77 78 79 #endif // !_ASSEMBLER 80 81 #endif /* MMU_H */ 82