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_ptr(ram_addr_t addr); 33 void qemu_ram_free(ram_addr_t addr); 34 void qemu_ram_free_from_ptr(ram_addr_t addr); 35 36 static inline bool cpu_physical_memory_get_dirty(ram_addr_t start, 37 ram_addr_t length, 38 unsigned client) 39 { 40 unsigned long end, page, next; 41 42 assert(client < DIRTY_MEMORY_NUM); 43 44 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 45 page = start >> TARGET_PAGE_BITS; 46 next = find_next_bit(ram_list.dirty_memory[client], end, page); 47 48 return next < end; 49 } 50 51 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr, 52 unsigned client) 53 { 54 return cpu_physical_memory_get_dirty(addr, 1, client); 55 } 56 57 static inline bool cpu_physical_memory_is_clean(ram_addr_t addr) 58 { 59 bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA); 60 bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE); 61 bool migration = 62 cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION); 63 return !(vga && code && migration); 64 } 65 66 static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr, 67 unsigned client) 68 { 69 assert(client < DIRTY_MEMORY_NUM); 70 set_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]); 71 } 72 73 static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start, 74 ram_addr_t length) 75 { 76 unsigned long end, page; 77 78 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 79 page = start >> TARGET_PAGE_BITS; 80 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION], page, end - page); 81 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_VGA], page, end - page); 82 bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_CODE], page, end - page); 83 xen_modified_memory(start, length); 84 } 85 86 #if !defined(_WIN32) 87 static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap, 88 ram_addr_t start, 89 ram_addr_t pages) 90 { 91 unsigned long i, j; 92 unsigned long page_number, c; 93 hwaddr addr; 94 ram_addr_t ram_addr; 95 unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS; 96 unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE; 97 unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS); 98 99 /* start address is aligned at the start of a word? */ 100 if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) && 101 (hpratio == 1)) { 102 long k; 103 long nr = BITS_TO_LONGS(pages); 104 105 for (k = 0; k < nr; k++) { 106 if (bitmap[k]) { 107 unsigned long temp = leul_to_cpu(bitmap[k]); 108 109 ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION][page + k] |= temp; 110 ram_list.dirty_memory[DIRTY_MEMORY_VGA][page + k] |= temp; 111 ram_list.dirty_memory[DIRTY_MEMORY_CODE][page + k] |= temp; 112 } 113 } 114 xen_modified_memory(start, pages); 115 } else { 116 /* 117 * bitmap-traveling is faster than memory-traveling (for addr...) 118 * especially when most of the memory is not dirty. 119 */ 120 for (i = 0; i < len; i++) { 121 if (bitmap[i] != 0) { 122 c = leul_to_cpu(bitmap[i]); 123 do { 124 j = ctzl(c); 125 c &= ~(1ul << j); 126 page_number = (i * HOST_LONG_BITS + j) * hpratio; 127 addr = page_number * TARGET_PAGE_SIZE; 128 ram_addr = start + addr; 129 cpu_physical_memory_set_dirty_range(ram_addr, 130 TARGET_PAGE_SIZE * hpratio); 131 } while (c != 0); 132 } 133 } 134 } 135 } 136 #endif /* not _WIN32 */ 137 138 static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start, 139 ram_addr_t length, 140 unsigned client) 141 { 142 unsigned long end, page; 143 144 assert(client < DIRTY_MEMORY_NUM); 145 end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; 146 page = start >> TARGET_PAGE_BITS; 147 bitmap_clear(ram_list.dirty_memory[client], page, end - page); 148 } 149 150 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t length, 151 unsigned client); 152 153 #endif 154 #endif 155