[1] | 1 | /* |
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| 2 | * vmm.h - virtual memory management related operations |
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| 3 | * |
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| 4 | * Authors Ghassan Almaless (2008,2009,2010,2011, 2012) |
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| 5 | * Mohamed Lamine Karaoui (2015) |
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[23] | 6 | * Alain Greiner (2016,2017) |
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[18] | 7 | * |
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[1] | 8 | * Copyright (c) UPMC Sorbonne Universites |
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| 9 | * |
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| 10 | * This file is part of ALMOS-MKH. |
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| 11 | * |
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| 12 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 13 | * under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; version 2.0 of the License. |
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| 15 | * |
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| 16 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 19 | * General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 24 | */ |
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| 25 | |
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| 26 | #ifndef _VMM_H_ |
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| 27 | #define _VMM_H_ |
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| 28 | |
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| 29 | #include <hal_types.h> |
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| 30 | #include <bits.h> |
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| 31 | #include <list.h> |
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| 32 | #include <spinlock.h> |
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| 33 | #include <hal_gpt.h> |
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| 34 | #include <vseg.h> |
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| 35 | #include <page.h> |
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| 36 | |
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| 37 | /**** Forward declarations ****/ |
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| 38 | |
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| 39 | struct process_s; |
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| 40 | |
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| 41 | /********************************************************************************************* |
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[407] | 42 | * This structure defines the STACK allocator used by the VMM to dynamically handle |
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| 43 | * a STACK vseg requested or released by an user process. |
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| 44 | * This allocator handles a fixed size array of fixed size slots in the STACK zone. |
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[1] | 45 | * The stack size and the number of slots are defined by the CONFIG_VMM_STACK_SIZE, and |
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[407] | 46 | * CONFIG_VMM_STACK_BASE parameters. |
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[1] | 47 | * Each slot can contain one user stack vseg. The first page in the slot is not allocated |
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| 48 | * to detect stack overflow. |
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| 49 | * The slot index can be computed form the slot base address, and reversely. |
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| 50 | * All allocation / release operations are registered in the stack_bitmap, that completely |
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[18] | 51 | * define the STACK zone state. |
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[1] | 52 | ********************************************************************************************/ |
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| 53 | |
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| 54 | typedef struct stack_mgr_s |
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| 55 | { |
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| 56 | spinlock_t lock; /*! lock protecting STACK allocator */ |
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| 57 | vpn_t vpn_base; /*! first page of STACK zone */ |
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| 58 | bitmap_t bitmap; /*! bit bector of allocated stacks */ |
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| 59 | } |
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| 60 | stack_mgr_t; |
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| 61 | |
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| 62 | /********************************************************************************************* |
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[407] | 63 | * This structure defines the MMAP allocator used by the VMM to dynamically handle |
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[1] | 64 | * MMAP vsegs requested or released by an user process. |
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[18] | 65 | * This allocator should be only used in the reference cluster. |
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| 66 | * - allocation policy : all allocated vsegs occupy an integer number of pages that is |
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[1] | 67 | * power of 2, and are aligned on a page boundary. The requested number of pages is |
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[18] | 68 | * rounded if required. The first_free_vpn variable defines completely the MMAP zone state. |
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[1] | 69 | * It is never decremented, as the released vsegs are simply registered in a zombi_list. |
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[18] | 70 | * The relevant zombi_list is checked first for each allocation request. |
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[1] | 71 | * - release policy : a released MMAP vseg is registered in an array of zombi_lists. |
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| 72 | * This array is indexed by ln(number of pages), and each entry contains the root of |
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| 73 | * a local list of zombi vsegs that have the same size. The physical memory allocated |
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| 74 | * for a zombi vseg descriptor is not released, to use the "list" field. |
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| 75 | * This physical memory allocated for MMAP vseg descriptors is actually released |
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| 76 | * when the VMM is destroyed. |
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| 77 | ********************************************************************************************/ |
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| 78 | |
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| 79 | typedef struct mmap_mgr_s |
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| 80 | { |
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| 81 | spinlock_t lock; /*! lock protecting MMAP allocator */ |
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| 82 | vpn_t vpn_base; /*! first page of MMAP zone */ |
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| 83 | vpn_t vpn_size; /*! number of pages in MMAP zone */ |
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| 84 | vpn_t first_free_vpn; /*! first free page in MMAP zone */ |
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| 85 | list_entry_t zombi_list[32]; /*! array of roots of released vsegs lists */ |
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| 86 | } |
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| 87 | mmap_mgr_t; |
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| 88 | |
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| 89 | /********************************************************************************************* |
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| 90 | * This structure defines the Virtual Memory Manager for a given process in a given cluster. |
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| 91 | * This local VMM provides three main services: |
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[406] | 92 | * 1) It registers all vsegs statically or dynamically defined in the vseg list. |
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[407] | 93 | * 2) It allocates virtual memory space for the STACKS and MMAP vsegs (FILE/ANON/REMOTE). |
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[1] | 94 | * 3) It contains the local copy of the generic page table descriptor. |
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| 95 | ********************************************************************************************/ |
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| 96 | |
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| 97 | typedef struct vmm_s |
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| 98 | { |
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[407] | 99 | rwlock_t vsegs_lock; /*! lock protecting the vsegs list */ |
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[1] | 100 | list_entry_t vsegs_root; /*! all vsegs in same process and same cluster */ |
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[23] | 101 | uint32_t vsegs_nr; /*! total number of local vsegs */ |
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[1] | 102 | |
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| 103 | gpt_t gpt; /*! embedded generic page table descriptor */ |
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| 104 | |
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| 105 | stack_mgr_t stack_mgr; /*! embedded STACK vsegs allocator */ |
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| 106 | mmap_mgr_t mmap_mgr; /*! embedded MMAP vsegs allocator */ |
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| 107 | |
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[407] | 108 | uint32_t pgfault_nr; /*! page fault counter (instrumentation) */ |
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[1] | 109 | uint32_t u_err_nr; /*! TODO ??? [AG] */ |
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| 110 | uint32_t m_err_nr; /*! TODO ??? [AG] */ |
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| 111 | |
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| 112 | vpn_t kent_vpn_base; /*! kentry vseg first page */ |
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| 113 | vpn_t args_vpn_base; /*! args vseg first page */ |
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| 114 | vpn_t envs_vpn_base; /*! envs zone first page */ |
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| 115 | vpn_t heap_vpn_base; /*! envs zone first page */ |
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| 116 | vpn_t code_vpn_base; /*! code zone first page */ |
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| 117 | vpn_t data_vpn_base; /*! data zone first page */ |
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| 118 | |
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| 119 | intptr_t entry_point; /*! main thread entry point */ |
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| 120 | } |
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| 121 | vmm_t; |
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| 122 | |
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| 123 | /********************************************************************************************* |
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[406] | 124 | * This function initialises the virtual memory manager attached to an user process. |
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[407] | 125 | * - It initializes the STACK and MMAP allocators. |
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| 126 | * - It registers the "kentry", "args", "envs" vsegs in the VSL. |
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| 127 | * - The "code" and "data" vsegs are registered by the elf_load_process() function. |
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| 128 | * - The "stack" vsegs are dynamically created by the thread_user_create() function. |
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| 129 | * - The "file", "anon", "remote" vsegs are dynamically created by the mmap() syscalls. |
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[406] | 130 | * - It initializes the generic page table, calling the HAL specific hal_gpt_init() function. |
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[407] | 131 | * - For TSAR it map all pages for the "kentry" vseg, that must be identity mapping. |
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[406] | 132 | * TODO : Any error in this function gives a kernel panic => improve error handling. |
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[1] | 133 | ********************************************************************************************* |
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| 134 | * @ process : pointer on process descriptor |
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| 135 | ********************************************************************************************/ |
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| 136 | void vmm_init( struct process_s * process ); |
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| 137 | |
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| 138 | /********************************************************************************************* |
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[407] | 139 | * This function displays on TXY0 the list or registered vsegs for a given <process>. |
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| 140 | * If the <mapping> argument is true, it displays for each vesg all mapped PTEs in GPT. |
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[23] | 141 | ********************************************************************************************* |
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[407] | 142 | * @ process : pointer on process descriptor. |
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| 143 | * @ mapping : detailed mapping if true. |
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| 144 | ********************************************************************************************/ |
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| 145 | void vmm_display( struct process_s * process, |
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| 146 | bool_t mapping ); |
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| 147 | |
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| 148 | /********************************************************************************************* |
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| 149 | * This function is called by the sys_fork() system call. |
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| 150 | * It copies the content of a parent process descriptor VMM to a child process VMM. |
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| 151 | * - All vsegs registered in the source VSL are copied in the destination VSL. |
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| 152 | * - All PTEs registered in the source GPT are copied in destination GPT. For all writable |
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| 153 | * PTEs - but the FILE vsegs - the WRITABLE flag is reset and the COW flag is set in |
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| 154 | * the destination GPT. |
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| 155 | ********************************************************************************************* |
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[23] | 156 | * @ dst_process : pointer on destination process descriptor. |
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| 157 | * @ src_process : pointer on source process descriptor. |
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| 158 | * @ return 0 if success / return ENOMEM if failure. |
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| 159 | ********************************************************************************************/ |
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| 160 | error_t vmm_copy( struct process_s * dst_process, |
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| 161 | struct process_s * src_process ); |
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| 162 | |
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| 163 | /********************************************************************************************* |
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[1] | 164 | * This function removes all vsegs registered in in a virtual memory manager, |
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[18] | 165 | * and releases the memory allocated to the local generic page table. |
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[1] | 166 | ********************************************************************************************* |
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[23] | 167 | * @ process : pointer on process descriptor. |
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[1] | 168 | ********************************************************************************************/ |
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| 169 | void vmm_destroy( struct process_s * process ); |
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| 170 | |
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| 171 | /********************************************************************************************* |
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[18] | 172 | * This function scans the list of vsegs registered in the VMM of a given process descriptor |
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[1] | 173 | * to check if a given virtual region (defined by a base and size) overlap an existing vseg. |
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| 174 | ********************************************************************************************* |
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| 175 | * @ process : pointer on process descriptor. |
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| 176 | * @ base : region virtual base address. |
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| 177 | * @ size : region size (bytes). |
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| 178 | * @ returns NULL if no conflict / return conflicting vseg pointer if conflict. |
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| 179 | ********************************************************************************************/ |
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| 180 | vseg_t * vmm_check_conflict( struct process_s * process, |
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| 181 | vpn_t base, |
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| 182 | vpn_t size ); |
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| 183 | |
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| 184 | /********************************************************************************************* |
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[18] | 185 | * This function allocates memory for a vseg descriptor, initialises it, and register it |
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[407] | 186 | * in the VMM of the local process descriptor, that should be the reference process. |
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| 187 | * For the 'stack", "file", "anon", & "remote" types, it does not use the <base> argument, |
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| 188 | * but uses the STACK and MMAP virtual memory allocators. |
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| 189 | * It checks collision with all pre-existing vsegs. |
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| 190 | * To comply with the "on-demand" paging policy, this function does NOT modify the page table, |
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| 191 | * and does not allocate physical memory for vseg data. |
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| 192 | * It should be called by a local thread (could be a RPC thread if the client thread is not |
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| 193 | * running in the regerence cluster). |
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[1] | 194 | ********************************************************************************************* |
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[407] | 195 | * @ process : pointer on local processor descriptor. |
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| 196 | * @ type : vseg type. |
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| 197 | * @ base : vseg base address (not used for dynamically allocated vsegs). |
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| 198 | * @ size : vseg size (bytes). |
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| 199 | * @ file_offset : offset in file for CODE, DATA, FILE types. |
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| 200 | * @ file_size : can be smaller than "size" for DATA type. |
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| 201 | * @ mapper_xp : extended pointer on mapper for CODE, DATA, FILE types. |
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| 202 | * @ cxy : physical mapping cluster (for non distributed vsegs). |
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| 203 | * @ returns pointer on vseg if success / returns NULL if no memory, or conflict. |
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[1] | 204 | ********************************************************************************************/ |
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| 205 | vseg_t * vmm_create_vseg( struct process_s * process, |
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[407] | 206 | vseg_type_t type, |
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[18] | 207 | intptr_t base, |
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[407] | 208 | uint32_t size, |
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| 209 | uint32_t file_offset, |
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| 210 | uint32_t file_size, |
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| 211 | xptr_t mapper_xp, |
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| 212 | cxy_t cxy ); |
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[1] | 213 | |
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| 214 | /********************************************************************************************* |
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[18] | 215 | * This function removes a vseg identified by it's pointer from the VMM of the calling process. |
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[1] | 216 | * - If the vseg has not the STACK or MMAP type, it is removed from the vsegs list, |
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| 217 | * and the physical memory allocated to vseg descriptor is released to KMEM. |
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| 218 | * - If the vseg has the STACK type, it is removed from the vsegs list, the physical memory |
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| 219 | * allocated to vseg descriptor is released to KMEM, and the stack slot is returned to the |
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| 220 | * VMM STACK allocator. |
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| 221 | * - If the vseg has the MMAP type, it is removed from the vsegs list and is registered |
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| 222 | * in the zombi_list of the VMM MMAP allocator for future reuse. The physical memory |
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| 223 | * allocated to vseg descriptor is NOT released to KMEM. |
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| 224 | ********************************************************************************************* |
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| 225 | * @ vseg : pointer on vseg to be removed. |
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| 226 | ********************************************************************************************/ |
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| 227 | void vmm_remove_vseg( vseg_t * vseg ); |
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| 228 | |
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| 229 | /********************************************************************************************* |
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[18] | 230 | * This function allocates physical memory from the local cluster to map all PTEs |
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[1] | 231 | * of a "kernel" vseg (type KCODE , KDATA, or KDEV) in the page table of process_zero. |
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[68] | 232 | * WARNING : It should not be used for "user" vsegs, that must be mapped using the |
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[1] | 233 | * "on-demand-paging" policy. |
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| 234 | ********************************************************************************************* |
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| 235 | * @ vseg : pointer on the vseg to be mapped. |
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| 236 | * @ attr : GPT attributes to be set for all vseg pages. |
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| 237 | * @ returns 0 if success / returns ENOMEM if no memory |
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| 238 | ********************************************************************************************/ |
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[68] | 239 | error_t vmm_map_kernel_vseg( vseg_t * vseg, |
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| 240 | uint32_t attr ); |
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[1] | 241 | |
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| 242 | /********************************************************************************************* |
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[18] | 243 | * This function unmaps all PTEs of a given vseg, in the generic page table associated |
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[1] | 244 | * to a given process descriptor, and releases the corresponding physical memory. |
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| 245 | * It can be used for any type of vseg. |
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| 246 | ********************************************************************************************* |
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| 247 | * @ process : pointer on process descriptor. |
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| 248 | * @ vseg : pointer on the vseg to be unmapped. |
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| 249 | ********************************************************************************************/ |
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| 250 | void vmm_unmap_vseg( struct process_s * process, |
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| 251 | vseg_t * vseg ); |
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| 252 | |
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| 253 | /********************************************************************************************* |
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[18] | 254 | * This function removes a given region (defined by a base address and a size) from |
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[407] | 255 | * the VMM of a given process descriptor. This can modify the number of vsegs: |
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[1] | 256 | * (a) if the region is not entirely mapped in an existing vseg, it's an error. |
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| 257 | * (b) if the region has same base and size as an existing vseg, the vseg is removed. |
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[406] | 258 | * (c) if the removed region cut the vseg in two parts, it is modified. |
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| 259 | * (d) if the removed region cut the vseg in three parts, it is modified, and a new |
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| 260 | * vseg is created with same type. |
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[407] | 261 | * FIXME [AG] this function must be called by a thread running in the reference cluster, |
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| 262 | * and the VMM must be updated in all process descriptors copies. |
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[1] | 263 | ********************************************************************************************* |
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| 264 | * @ process : pointer on process descriptor |
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| 265 | * @ base : vseg base address |
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| 266 | * @ size : vseg size (bytes) |
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| 267 | ********************************************************************************************/ |
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| 268 | error_t vmm_resize_vseg( struct process_s * process, |
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| 269 | intptr_t base, |
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| 270 | intptr_t size ); |
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| 271 | |
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| 272 | /********************************************************************************************* |
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[388] | 273 | * This function checks that a given virtual address is contained in a registered vseg. |
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[399] | 274 | * It can be called by any thread running in any cluster: |
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| 275 | * - if the vseg is registered in the local process VMM, it returns the local vseg pointer. |
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[388] | 276 | * - if the vseg is missing in local VMM, it uses a RPC to get it from the reference cluster, |
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| 277 | * register it in local VMM and returns the local vseg pointer, if success. |
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[406] | 278 | * - it returns an user error if the vseg is missing in the reference VMM, or if there is |
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| 279 | * not enough memory for a new vseg descriptor in cluster containing the calling thread. |
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[1] | 280 | ********************************************************************************************* |
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[388] | 281 | * @ process : [in] pointer on process descriptor |
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| 282 | * @ vaddr : [in] virtual address |
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| 283 | * @ vseg : [out] pointer on found vseg |
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| 284 | * @ returns 0 if success / returns -1 if user error. |
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[1] | 285 | *********************************************************************************************/ |
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[388] | 286 | error_t vmm_get_vseg( struct process_s * process, |
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| 287 | intptr_t vaddr, |
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[394] | 288 | vseg_t ** vseg ); |
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[1] | 289 | |
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| 290 | /********************************************************************************************* |
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[407] | 291 | * This function is called by the generic exception handler when a page-fault event |
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[23] | 292 | * has been detected in a given cluster. |
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[407] | 293 | * - If the local cluster is the reference, it call directly the vmm_get_pte() function. |
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[401] | 294 | * - If the local cluster is not the reference cluster, it send a RPC_VMM_GET_PTE |
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[407] | 295 | * to the reference cluster to get the missing PTE attributes and PPN, |
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| 296 | * and update the local page table. |
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[1] | 297 | ********************************************************************************************* |
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| 298 | * @ process : pointer on process descriptor. |
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| 299 | * @ vpn : VPN of the missing PTE. |
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| 300 | * @ returns 0 if success / returns ENOMEM if no memory. |
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| 301 | ********************************************************************************************/ |
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| 302 | error_t vmm_handle_page_fault( struct process_s * process, |
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[18] | 303 | vpn_t vpn ); |
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[1] | 304 | |
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| 305 | /********************************************************************************************* |
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[407] | 306 | * This function is called by the generic exception handler when a copy-on-write event |
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| 307 | * has been detected in a given cluster. |
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| 308 | * - If the local cluster is the reference, it call directly the vmm_get_pte() function. |
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| 309 | * - If the local cluster is not the reference cluster, it send a RPC_VMM_GET_PTE |
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| 310 | * to the reference cluster to get the missing PTE attributes and PPN, |
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| 311 | * and update the local page table. |
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[1] | 312 | ********************************************************************************************* |
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[407] | 313 | * @ process : pointer on process descriptor. |
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| 314 | * @ vpn : VPN of the missing PTE. |
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| 315 | * @ returns 0 if success / returns ENOMEM if no memory. |
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| 316 | ********************************************************************************************/ |
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| 317 | error_t vmm_copy_on_write( struct process_s * process, |
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| 318 | vpn_t vpn ); |
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| 319 | |
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| 320 | /********************************************************************************************* |
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| 321 | * This function is called when a new PTE (GPT entry) is required because a "page-fault", |
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| 322 | * or "copy-on_write" event has been detected for a given <vpn> in a given <process>. |
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| 323 | * The <cow> argument defines the type of event to be handled. |
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| 324 | * This function must be called by a thread running in reference cluster, and the vseg |
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| 325 | * containing the searched VPN should be registered in the reference VMM. |
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| 326 | * - for an actual page-fault, it allocates the missing physical page from the target cluster |
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| 327 | * defined by the vseg type, initialize it, and update the reference page table. |
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| 328 | * - for a copy-on-write, it allocates a new physical page from the target cluster, |
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| 329 | * initialise it from the old physical page, and update the reference page table. |
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| 330 | * In both cases, it calls the RPC_PMEM_GET_PAGES to get the new physical page if the |
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| 331 | * target cluster is not the reference cluster. |
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| 332 | * It returns in the <attr> and <ppn> arguments the accessed or modified PTE. |
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| 333 | ********************************************************************************************* |
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[1] | 334 | * @ process : [in] pointer on process descriptor. |
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| 335 | * @ vpn : [in] VPN defining the missing PTE. |
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[407] | 336 | * @ cow : [in] "copy_on_write" if true / "page_fault" if false. |
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[1] | 337 | * @ attr : [out] PTE attributes. |
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| 338 | * @ ppn : [out] PTE ppn. |
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| 339 | * @ returns 0 if success / returns ENOMEM if error. |
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| 340 | ********************************************************************************************/ |
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| 341 | error_t vmm_get_pte( struct process_s * process, |
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| 342 | vpn_t vpn, |
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[407] | 343 | bool_t cow, |
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[1] | 344 | uint32_t * attr, |
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| 345 | ppn_t * ppn ); |
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| 346 | |
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| 347 | /********************************************************************************************* |
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[401] | 348 | * This function is called by the vmm_get_pte() function when a page is unmapped. |
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[313] | 349 | * Depending on the vseg type, defined by the <vseg> argument, it returns the PPN |
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| 350 | * (Physical Page Number) associated to a missing page defined by the <vpn> argument. |
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[406] | 351 | * - For the FILE type, it returns directly the physical page from the file mapper. |
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| 352 | * - For the CODE and DATA types, it allocates a new phsical page from the cluster defined |
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| 353 | * by the <vseg->cxy> field, or by the <vpn> MSB bits for a distributed vseg, |
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| 354 | * and initialize this page from the .elf file mapper. |
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| 355 | * - For all other types, it allocates a new physical page from the cluster defined |
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| 356 | * by the <vseg->cxy> field, or by the <vpn> MSB bits for a distributed vseg, |
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| 357 | * but the new page is not initialized. |
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[313] | 358 | ********************************************************************************************* |
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| 359 | * @ vseg : local pointer on vseg containing the mising page. |
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| 360 | * @ vpn : Virtual Page Number identifying the missing page. |
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| 361 | * @ ppn : [out] returned Physical Page Number. |
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[401] | 362 | * return 0 if success / return EINVAL or ENOMEM if error. |
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[313] | 363 | ********************************************************************************************/ |
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| 364 | error_t vmm_get_one_ppn( vseg_t * vseg, |
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| 365 | vpn_t vpn, |
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| 366 | ppn_t * ppn ); |
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| 367 | |
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| 368 | /********************************************************************************************* |
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[18] | 369 | * This function makes the virtual to physical address translation, using the calling |
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[68] | 370 | * process page table. It uses identity mapping if required by the <ident> argument. |
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[23] | 371 | * This address translation is required to configure the peripherals having a DMA |
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| 372 | * capability, or to implement the software L2/L3 cache cohérence, using the MMC device |
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| 373 | * synchronisation primitives. |
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| 374 | * WARNING : the <ident> value must be defined by the CONFIG_KERNEL_IDENTITY_MAP parameter. |
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[1] | 375 | ********************************************************************************************* |
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| 376 | * @ ident : [in] uses identity mapping if true. |
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| 377 | * @ ptr : [in] virtual address. |
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| 378 | * @ paddr : [out] pointer on buffer for physical address. |
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| 379 | * @ returns 0 if success / returns ENOMEM if error. |
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| 380 | ********************************************************************************************/ |
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| 381 | error_t vmm_v2p_translate( bool_t ident, |
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| 382 | void * ptr, |
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| 383 | paddr_t * paddr ); |
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| 384 | |
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| 385 | |
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| 386 | |
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| 387 | #endif /* _VMM_H_ */ |
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