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memory: Change MemoryRegion priorities from unsigned to signed

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When memory regions overlap, priority can be used to specify
which of them takes priority. By making the priority values signed
rather than unsigned, we make it more convenient to implement
a situation where one "background" region should appear only
where no other region exists: rather than having to explicitly
specify a high priority for all the other regions, we can let them take
the default (zero) priority and specify a negative priority for the
background region.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2013-09-16 11:21:14 +03:00 committed by Michael S. Tsirkin
parent e26d3e7346
commit a1ff8ae066
4 changed files with 7 additions and 7 deletions
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4
hw/core/sysbus.c
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@ -49,7 +49,7 @@ void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
}
static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
bool may_overlap, unsigned priority)
bool may_overlap, int priority)
{
assert(n >= 0 && n < dev->num_mmio);
@ -81,7 +81,7 @@ void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
}
void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
unsigned priority)
int priority)
{
sysbus_mmio_map_common(dev, n, addr, true, priority);
}

4
include/exec/memory.h
View File

@ -153,7 +153,7 @@ struct MemoryRegion {
bool flush_coalesced_mmio;
MemoryRegion *alias;
hwaddr alias_offset;
unsigned priority;
int priority;
bool may_overlap;
QTAILQ_HEAD(subregions, MemoryRegion) subregions;
QTAILQ_ENTRY(MemoryRegion) subregions_link;
@ -779,7 +779,7 @@ void memory_region_add_subregion(MemoryRegion *mr,
void memory_region_add_subregion_overlap(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion,
unsigned priority);
int priority);
/**
* memory_region_get_ram_addr: Get the ram address associated with a memory

2
include/hw/sysbus.h
View File

@ -68,7 +68,7 @@ void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size);
void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq);
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr);
void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
unsigned priority);
int priority);
void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
MemoryRegion *mem);
void sysbus_del_io(SysBusDevice *dev, MemoryRegion *mem);

4
memory.c
View File

@ -1473,7 +1473,7 @@ void memory_region_add_subregion(MemoryRegion *mr,
void memory_region_add_subregion_overlap(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion,
unsigned priority)
int priority)
{
subregion->may_overlap = true;
subregion->priority = priority;
@ -1506,7 +1506,7 @@ void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
{
MemoryRegion *parent = mr->parent;
unsigned priority = mr->priority;
int priority = mr->priority;
bool may_overlap = mr->may_overlap;
if (addr == mr->addr || !parent) {