static inline int check_dirty(ram_addr_t page, ram_addr_t page24,
ram_addr_t cpage)
{
int ret;
unsigned int off;
ret = cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG);
for (off = 0; off < TARGET_PAGE_SIZE * 4; off += TARGET_PAGE_SIZE) {
ret |= cpu_physical_memory_get_dirty(page24 + off, VGA_DIRTY_FLAG);
ret |= cpu_physical_memory_get_dirty(cpage + off, VGA_DIRTY_FLAG);
}
return ret;
}
static int ram_save_block(QEMUFile *f)
{
static ram_addr_t current_addr = 0;
ram_addr_t saved_addr = current_addr;
ram_addr_t addr = 0;
int found = 0;
while (addr < last_ram_offset) {
if (cpu_physical_memory_get_dirty(current_addr, MIGRATION_DIRTY_FLAG)) {
uint8_t *p;
cpu_physical_memory_reset_dirty(current_addr,
current_addr + TARGET_PAGE_SIZE,
MIGRATION_DIRTY_FLAG);
p = qemu_get_ram_ptr(current_addr);
if (is_dup_page(p, *p)) {
qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
} else {
qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
}
found = 1;
break;
}
addr += TARGET_PAGE_SIZE;
current_addr = (saved_addr + addr) % last_ram_offset;
}
return found;
}
static ram_addr_t ram_save_remaining(void)
{
ram_addr_t addr;
ram_addr_t count = 0;
for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
count++;
}
}
return count;
}
/* Fixed line length 1024 allows us to do nice tricks not possible on
VGA... */
static void tcx_update_display(void *opaque)
{
TCXState *ts = opaque;
ram_addr_t page, page_min, page_max;
int y, y_start, dd, ds;
uint8_t *d, *s;
void (*f)(TCXState *s1, uint8_t *dst, const uint8_t *src, int width);
if (ds_get_bits_per_pixel(ts->ds) == 0)
return;
page = ts->vram_offset;
y_start = -1;
page_min = -1;
page_max = 0;
d = ds_get_data(ts->ds);
s = ts->vram;
dd = ds_get_linesize(ts->ds);
ds = 1024;
switch (ds_get_bits_per_pixel(ts->ds)) {
case 32:
f = tcx_draw_line32;
break;
case 15:
case 16:
f = tcx_draw_line16;
break;
default:
case 8:
f = tcx_draw_line8;
break;
case 0:
return;
}
for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG)) {
if (y_start < 0)
y_start = y;
if (page < page_min)
page_min = page;
if (page > page_max)
page_max = page;
f(ts, d, s, ts->width);
d += dd;
s += ds;
f(ts, d, s, ts->width);
d += dd;
s += ds;
f(ts, d, s, ts->width);
d += dd;
s += ds;
f(ts, d, s, ts->width);
d += dd;
s += ds;
} else {
if (y_start >= 0) {
/* flush to display */
dpy_update(ts->ds, 0, y_start,
ts->width, y - y_start);
y_start = -1;
}
d += dd * 4;
s += ds * 4;
}
}
if (y_start >= 0) {
/* flush to display */
dpy_update(ts->ds, 0, y_start,
ts->width, y - y_start);
}
/* reset modified pages */
if (page_max >= page_min) {
cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE,
VGA_DIRTY_FLAG);
}
}
void framebuffer_update_display(
DisplayState *ds,
target_phys_addr_t base,
int cols, /* Width in pixels. */
int rows, /* Leight in pixels. */
int src_width, /* Length of source line, in bytes. */
int dest_row_pitch, /* Bytes between adjacent horizontal output pixels. */
int dest_col_pitch, /* Bytes between adjacent vertical output pixels. */
int invalidate, /* nonzero to redraw the whole image. */
drawfn fn,
void *opaque,
int *first_row, /* Input and output. */
int *last_row /* Output only */)
{
target_phys_addr_t src_len;
uint8_t *dest;
uint8_t *src;
uint8_t *src_base;
int first, last = 0;
int dirty;
int i;
ram_addr_t addr;
ram_addr_t pd;
ram_addr_t pd2;
i = *first_row;
*first_row = -1;
src_len = src_width * rows;
cpu_physical_sync_dirty_bitmap(base, base + src_len);
pd = cpu_get_physical_page_desc(base);
pd2 = cpu_get_physical_page_desc(base + src_len - 1);
/* We should reall check that this is a continuous ram region.
Instead we just check that the first and last pages are
both ram, and the right distance apart. */
if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM
|| (pd2 & ~TARGET_PAGE_MASK) > IO_MEM_ROM) {
return;
}
pd = (pd & TARGET_PAGE_MASK) + (base & ~TARGET_PAGE_MASK);
if (((pd + src_len - 1) & TARGET_PAGE_MASK) != (pd2 & TARGET_PAGE_MASK)) {
return;
}
src_base = cpu_physical_memory_map(base, &src_len, 0);
/* If we can't map the framebuffer then bail. We could try harder,
but it's not really worth it as dirty flag tracking will probably
already have failed above. */
if (!src_base)
return;
if (src_len != src_width * rows) {
cpu_physical_memory_unmap(src_base, src_len, 0, 0);
return;
}
src = src_base;
dest = ds_get_data(ds);
if (dest_col_pitch < 0)
dest -= dest_col_pitch * (cols - 1);
if (dest_row_pitch < 0) {
dest -= dest_row_pitch * (rows - 1);
}
first = -1;
addr = pd;
addr += i * src_width;
src += i * src_width;
dest += i * dest_row_pitch;
for (; i < rows; i++) {
target_phys_addr_t dirty_offset;
dirty = 0;
dirty_offset = 0;
while (addr + dirty_offset < TARGET_PAGE_ALIGN(addr + src_width)) {
dirty |= cpu_physical_memory_get_dirty(addr + dirty_offset,
VGA_DIRTY_FLAG);
dirty_offset += TARGET_PAGE_SIZE;
}
if (dirty || invalidate) {
fn(opaque, dest, src, cols, dest_col_pitch);
if (first == -1)
first = i;
last = i;
}
addr += src_width;
src += src_width;
dest += dest_row_pitch;
}
cpu_physical_memory_unmap(src_base, src_len, 0, 0);
if (first < 0) {
return;
}
cpu_physical_memory_reset_dirty(pd, pd + src_len, VGA_DIRTY_FLAG);
*first_row = first;
*last_row = last;
return;
}
int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
{
ram_addr_t addr;
uint64_t bytes_transferred_last;
double bwidth = 0;
uint64_t expected_time = 0;
if (stage < 0) {
cpu_physical_memory_set_dirty_tracking(0);
return 0;
}
if (cpu_physical_sync_dirty_bitmap(0, TARGET_PHYS_ADDR_MAX) != 0) {
qemu_file_set_error(f);
return 0;
}
if (stage == 1) {
bytes_transferred = 0;
/* Make sure all dirty bits are set */
for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) {
if (!cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
cpu_physical_memory_set_dirty(addr);
}
}
/* Enable dirty memory tracking */
cpu_physical_memory_set_dirty_tracking(1);
qemu_put_be64(f, last_ram_offset | RAM_SAVE_FLAG_MEM_SIZE);
}
bytes_transferred_last = bytes_transferred;
bwidth = qemu_get_clock_ns(rt_clock);
while (!qemu_file_rate_limit(f)) {
int ret;
ret = ram_save_block(f);
bytes_transferred += ret * TARGET_PAGE_SIZE;
if (ret == 0) { /* no more blocks */
break;
}
}
bwidth = qemu_get_clock_ns(rt_clock) - bwidth;
bwidth = (bytes_transferred - bytes_transferred_last) / bwidth;
/* if we haven't transferred anything this round, force expected_time to a
* a very high value, but without crashing */
if (bwidth == 0) {
bwidth = 0.000001;
}
/* try transferring iterative blocks of memory */
if (stage == 3) {
/* flush all remaining blocks regardless of rate limiting */
while (ram_save_block(f) != 0) {
bytes_transferred += TARGET_PAGE_SIZE;
}
cpu_physical_memory_set_dirty_tracking(0);
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
return (stage == 2) && (expected_time <= migrate_max_downtime());
}
static inline int check_dirty(ram_addr_t page)
{
return cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG);
}
