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memory: introduce memory_region_present

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This new API will avoid having too many memory_region_ref/unref
in paths that currently use memory_region_find.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-07-02 13:40:48 +02:00
parent 46637be269
commit 3ce10901ca
4 changed files with 28 additions and 7 deletions
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8
hw/isa/lpc_ich9.c
View file

@ -481,19 +481,19 @@ static void ich9_lpc_machine_ready(Notifier *n, void *opaque)
uint8_t *pci_conf;
pci_conf = s->d.config;
if (memory_region_find(io_as, 0x3f8, 1).mr) {
if (memory_region_present(io_as, 0x3f8)) {
/* com1 */
pci_conf[0x82] |= 0x01;
}
if (memory_region_find(io_as, 0x2f8, 1).mr) {
if (memory_region_present(io_as, 0x2f8)) {
/* com2 */
pci_conf[0x82] |= 0x02;
}
if (memory_region_find(io_as, 0x378, 1).mr) {
if (memory_region_present(io_as, 0x378)) {
/* lpt */
pci_conf[0x82] |= 0x04;
}
if (memory_region_find(io_as, 0x3f0, 1).mr) {
if (memory_region_present(io_as, 0x3f0)) {
/* floppy */
pci_conf[0x82] |= 0x08;
}