1 /* 2 * Copyright (c) 2014 Travis Geiselbrecht 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files 6 * (the "Software"), to deal in the Software without restriction, 7 * including without limitation the rights to use, copy, modify, merge, 8 * publish, distribute, sublicense, and/or sell copies of the Software, 9 * and to permit persons to whom the Software is furnished to do so, 10 * subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 #pragma once 24 25 #include <stdint.h> 26 #include <sys/types.h> 27 #include <kernel/vm.h> 28 29 /* simple boot time allocator state */ 30 extern uintptr_t boot_alloc_start; 31 extern uintptr_t boot_alloc_end; 32 33 /** 34 * struct vmm_res_obj - Object reserving address space with no physical backing. 35 * @vmm_obj: The underlying vmm object. 36 * @regions: The regions mapped inside this object. 37 */ 38 struct vmm_res_obj { 39 struct vmm_obj vmm_obj; 40 struct bst_root regions; 41 }; 42 43 void vmm_init_preheap(void); 44 void vmm_init(void); 45 46 /* Reserve a number of pages, ensuring that backing physical memory exists. Reserved pages 47 * can only be mapped using PMM_ALLOC_FLAG_FROM_RESERVED. 48 */ 49 status_t pmm_reserve_pages(uint count); 50 51 /* Unreserve a number of pages. */ 52 void pmm_unreserve_pages(uint count); 53 54 55 /* private interface between pmm and vm */ 56 void *pmm_paddr_to_kvaddr(paddr_t pa); 57 58 /* Check whether the given vmm_obj is a pmm whose memory 59 * needs to be cleared before mapping. 60 */ 61 bool pmm_vmm_is_pmm_that_needs_clear(struct vmm_obj* vmm); 62 63 /* Check whether the given vmm_obj is a pmm whose memory 64 * is allowed to be mapped tagged. 65 */ 66 bool pmm_vmm_is_pmm_that_allows_tagged(struct vmm_obj* vmm); 67 68 /* Declare that the memory associated with this vmm_obj 69 * (which must be a pmm_obj) was cleared 70 */ 71 void pmm_set_cleared(struct vmm_obj* vmm, size_t offset, size_t size); 72 73 /* Declare that the memory associated with this vmm_obj 74 * (which must be a pmm_obj) has been mapped as tagged 75 */ 76 void pmm_set_tagged(struct vmm_obj* vmm); 77