1 /* 2 * Declarations for cpu physical memory functions 3 * 4 * Copyright 2011 Red Hat, Inc. and/or its affiliates 5 * 6 * Authors: 7 * Avi Kivity <avi@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or 10 * later. See the COPYING file in the top-level directory. 11 * 12 */ 13 14 /* 15 * This header is for use by exec.c and memory.c ONLY. Do not include it. 16 * The functions declared here will be removed soon. 17 */ 18 19 #ifndef RAM_ADDR_H 20 #define RAM_ADDR_H 21 22 #ifndef CONFIG_USER_ONLY 23 #include "hw/xen/xen.h" 24 25 ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, 26 bool share, const char *mem_path, 27 Error **errp); 28 ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, 29 MemoryRegion *mr); 30 ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr); 31 int qemu_get_ram_fd(ram_addr_t addr); 32 void *qemu_get_ram_block_host_ptr(ram_addr_t addr); 33 void *qemu_get_ram_ptr(ram_addr_t addr); 34 void qemu_ram_free(ram_addr_t addr); 35 void qemu_ram_free_from_ptr(ram_addr_t addr); 36 37 static inline bool cpu_physical_memory_get_dirty(ram_addr_t start, 38 ram_addr_t length, 39 unsigned client) 40 { 41 unsigned long end, page, next; 42 43 assert(client < DIRTY_MEMORY_NUM); 44 45 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 46 page = start >> TARGET_PAGE_BITS; 47 next = find_next_bit(ram_list.dirty_memory[client], end, page); 48 49 return next < end; 50 } 51 52 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr, 53 unsigned client) 54 { 55 return cpu_physical_memory_get_dirty(addr, 1, client); 56 } 57 58 static inline bool cpu_physical_memory_is_clean(ram_addr_t addr) 59 { 60 bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA); 61 bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE); 62 bool migration = 63 cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION); 64 return !(vga && code && migration); 65 } 66 67 static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr, 68 unsigned client) 69 { 70 assert(client < DIRTY_MEMORY_NUM); 71 set_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]); 72 } 73 74 static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start, 75 ram_addr_t length) 76 { 77 unsigned long end, page; 78 79 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 80 page = start >> TARGET_PAGE_BITS; 81 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION], page, end - page); 82 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_VGA], page, end - page); 83 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_CODE], page, end - page); 84 xen_modified_memory(start, length); 85 } 86 87 #if !defined(_WIN32) 88 static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap, 89 ram_addr_t start, 90 ram_addr_t pages) 91 { 92 unsigned long i, j; 93 unsigned long page_number, c; 94 hwaddr addr; 95 ram_addr_t ram_addr; 96 unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS; 97 unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE; 98 unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS); 99 100 /* start address is aligned at the start of a word? */ 101 if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) && 102 (hpratio == 1)) { 103 long k; 104 long nr = BITS_TO_LONGS(pages); 105 106 for (k = 0; k < nr; k++) { 107 if (bitmap[k]) { 108 unsigned long temp = leul_to_cpu(bitmap[k]); 109 110 ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION][page + k] |= temp; 111 ram_list.dirty_memory[DIRTY_MEMORY_VGA][page + k] |= temp; 112 ram_list.dirty_memory[DIRTY_MEMORY_CODE][page + k] |= temp; 113 } 114 } 115 xen_modified_memory(start, pages); 116 } else { 117 /* 118 * bitmap-traveling is faster than memory-traveling (for addr...) 119 * especially when most of the memory is not dirty. 120 */ 121 for (i = 0; i < len; i++) { 122 if (bitmap[i] != 0) { 123 c = leul_to_cpu(bitmap[i]); 124 do { 125 j = ctzl(c); 126 c &= ~(1ul << j); 127 page_number = (i * HOST_LONG_BITS + j) * hpratio; 128 addr = page_number * TARGET_PAGE_SIZE; 129 ram_addr = start + addr; 130 cpu_physical_memory_set_dirty_range(ram_addr, 131 TARGET_PAGE_SIZE * hpratio); 132 } while (c != 0); 133 } 134 } 135 } 136 } 137 #endif /* not _WIN32 */ 138 139 static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start, 140 ram_addr_t length, 141 unsigned client) 142 { 143 unsigned long end, page; 144 145 assert(client < DIRTY_MEMORY_NUM); 146 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 147 page = start >> TARGET_PAGE_BITS; 148 bitmap_clear(ram_list.dirty_memory[client], page, end - page); 149 } 150 151 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t length, 152 unsigned client); 153 154 #endif 155 #endif 156