include/exec/ram_addr.h

   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, Error **errp);
  30 ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);
  31 ram_addr_t qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
  32                                      void (*resized)(const char*,
  33                                                      uint64_t length,
  34                                                      void *host),
  35                                      MemoryRegion *mr, Error **errp);
  36 int qemu_get_ram_fd(ram_addr_t addr);
  37 void *qemu_get_ram_block_host_ptr(ram_addr_t addr);
  38 void *qemu_get_ram_ptr(ram_addr_t addr);
  39 void qemu_ram_free(ram_addr_t addr);
  40 void qemu_ram_free_from_ptr(ram_addr_t addr);
  41
  42 int qemu_ram_resize(ram_addr_t base, ram_addr_t newsize, Error **errp);
  43
  44 static inline bool cpu_physical_memory_get_dirty(ram_addr_t start,
  45                                                  ram_addr_t length,
  46                                                  unsigned client)
  47 {
  48     unsigned long end, page, next;
  49
  50     assert(client < DIRTY_MEMORY_NUM);
  51
  52     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
  53     page = start >> TARGET_PAGE_BITS;
  54     next = find_next_bit(ram_list.dirty_memory[client], end, page);
  55
  56     return next < end;
  57 }
  58
  59 static inline bool cpu_physical_memory_get_clean(ram_addr_t start,
  60                                                  ram_addr_t length,
  61                                                  unsigned client)
  62 {
  63     unsigned long end, page, next;
  64
  65     assert(client < DIRTY_MEMORY_NUM);
  66
  67     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
  68     page = start >> TARGET_PAGE_BITS;
  69     next = find_next_zero_bit(ram_list.dirty_memory[client], end, page);
  70
  71     return next < end;
  72 }
  73
  74 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
  75                                                       unsigned client)
  76 {
  77     return cpu_physical_memory_get_dirty(addr, 1, client);
  78 }
  79
  80 static inline bool cpu_physical_memory_is_clean(ram_addr_t addr)
  81 {
  82     bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA);
  83     bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE);
  84     bool migration =
  85         cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
  86     return !(vga && code && migration);
  87 }
  88
  89 static inline bool cpu_physical_memory_range_includes_clean(ram_addr_t start,
  90                                                             ram_addr_t length)
  91 {
  92     bool vga = cpu_physical_memory_get_clean(start, length, DIRTY_MEMORY_VGA);
  93     bool code = cpu_physical_memory_get_clean(start, length, DIRTY_MEMORY_CODE);
  94     bool migration =
  95         cpu_physical_memory_get_clean(start, length, DIRTY_MEMORY_MIGRATION);
  96     return vga || code || migration;
  97 }
  98
  99 static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr,
 100                                                       unsigned client)
 101 {
 102     assert(client < DIRTY_MEMORY_NUM);
 103     set_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]);
 104 }
 105
 106 static inline void cpu_physical_memory_set_dirty_range_nocode(ram_addr_t start,
 107                                                               ram_addr_t length)
 108 {
 109     unsigned long end, page;
 110
 111     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
 112     page = start >> TARGET_PAGE_BITS;
 113     bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION], page, end - page);
 114     bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_VGA], page, end - page);
 115 }
 116
 117 static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
 118                                                        ram_addr_t length)
 119 {
 120     unsigned long end, page;
 121
 122     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
 123     page = start >> TARGET_PAGE_BITS;
 124     bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION], page, end - page);
 125     bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_VGA], page, end - page);
 126     bitmap_set(ram_list.dirty_memory[DIRTY_MEMORY_CODE], page, end - page);
 127     xen_modified_memory(start, length);
 128 }
 129
 130 #if !defined(_WIN32)
 131 static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
 132                                                           ram_addr_t start,
 133                                                           ram_addr_t pages)
 134 {
 135     unsigned long i, j;
 136     unsigned long page_number, c;
 137     hwaddr addr;
 138     ram_addr_t ram_addr;
 139     unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
 140     unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
 141     unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
 142
 143     /* start address is aligned at the start of a word? */
 144     if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) &&
 145         (hpratio == 1)) {
 146         long k;
 147         long nr = BITS_TO_LONGS(pages);
 148
 149         for (k = 0; k < nr; k++) {
 150             if (bitmap[k]) {
 151                 unsigned long temp = leul_to_cpu(bitmap[k]);
 152
 153                 ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION][page + k] |= temp;
 154                 ram_list.dirty_memory[DIRTY_MEMORY_VGA][page + k] |= temp;
 155                 ram_list.dirty_memory[DIRTY_MEMORY_CODE][page + k] |= temp;
 156             }
 157         }
 158         xen_modified_memory(start, pages);
 159     } else {
 160         /*
 161          * bitmap-traveling is faster than memory-traveling (for addr...)
 162          * especially when most of the memory is not dirty.
 163          */
 164         for (i = 0; i < len; i++) {
 165             if (bitmap[i] != 0) {
 166                 c = leul_to_cpu(bitmap[i]);
 167                 do {
 168                     j = ctzl(c);
 169                     c &= ~(1ul << j);
 170                     page_number = (i * HOST_LONG_BITS + j) * hpratio;
 171                     addr = page_number * TARGET_PAGE_SIZE;
 172                     ram_addr = start + addr;
 173                     cpu_physical_memory_set_dirty_range(ram_addr,
 174                                        TARGET_PAGE_SIZE * hpratio);
 175                 } while (c != 0);
 176             }
 177         }
 178     }
 179 }
 180 #endif /* not _WIN32 */
 181
 182 static inline void cpu_physical_memory_clear_dirty_range_type(ram_addr_t start,
 183                                                               ram_addr_t length,
 184                                                               unsigned client)
 185 {
 186     unsigned long end, page;
 187
 188     assert(client < DIRTY_MEMORY_NUM);
 189     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
 190     page = start >> TARGET_PAGE_BITS;
 191     bitmap_clear(ram_list.dirty_memory[client], page, end - page);
 192 }
 193
 194 static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start,
 195                                                          ram_addr_t length)
 196 {
 197     cpu_physical_memory_clear_dirty_range_type(start, length, DIRTY_MEMORY_MIGRATION);
 198     cpu_physical_memory_clear_dirty_range_type(start, length, DIRTY_MEMORY_VGA);
 199     cpu_physical_memory_clear_dirty_range_type(start, length, DIRTY_MEMORY_CODE);
 200 }
 201
 202
 203 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t length,
 204                                      unsigned client);
 205
 206 #endif
 207 #endif