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authorAvi Kivity <avi@redhat.com>2011-09-26 14:52:26 +0300
committerAvi Kivity <avi@redhat.com>2011-10-11 15:57:07 +0200
commit6bf9fd43cfc10022670d1135711d6952d98bcb02 (patch)
tree77f495b976f71e42980e5f16995e7a0db7f86437 /ioport.c
parentebf47c24b01857d8b49a892b853bdd13b8e3eb5e (diff)
downloadqemu-arm-6bf9fd43cfc10022670d1135711d6952d98bcb02.tar.gz
Introduce PortioList
Add a type and methods for manipulating a list of disjoint I/O ports, used in some older hardware devices. Based on original patch by Richard Henderson. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'ioport.c')
-rw-r--r--ioport.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/ioport.c b/ioport.c
index a32483ba84..36fa3a477e 100644
--- a/ioport.c
+++ b/ioport.c
@@ -27,6 +27,7 @@
#include "ioport.h"
#include "trace.h"
+#include "memory.h"
/***********************************************************/
/* IO Port */
@@ -313,3 +314,110 @@ uint32_t cpu_inl(pio_addr_t addr)
LOG_IOPORT("inl : %04"FMT_pioaddr" %08"PRIx32"\n", addr, val);
return val;
}
+
+void portio_list_init(PortioList *piolist,
+ const MemoryRegionPortio *callbacks,
+ void *opaque, const char *name)
+{
+ unsigned n = 0;
+
+ while (callbacks[n].size) {
+ ++n;
+ }
+
+ piolist->ports = callbacks;
+ piolist->nr = 0;
+ piolist->regions = g_new0(MemoryRegion *, n);
+ piolist->address_space = NULL;
+ piolist->opaque = opaque;
+ piolist->name = name;
+}
+
+void portio_list_destroy(PortioList *piolist)
+{
+ g_free(piolist->regions);
+}
+
+static void portio_list_add_1(PortioList *piolist,
+ const MemoryRegionPortio *pio_init,
+ unsigned count, unsigned start,
+ unsigned off_low, unsigned off_high)
+{
+ MemoryRegionPortio *pio;
+ MemoryRegionOps *ops;
+ MemoryRegion *region;
+ unsigned i;
+
+ /* Copy the sub-list and null-terminate it. */
+ pio = g_new(MemoryRegionPortio, count + 1);
+ memcpy(pio, pio_init, sizeof(MemoryRegionPortio) * count);
+ memset(pio + count, 0, sizeof(MemoryRegionPortio));
+
+ /* Adjust the offsets to all be zero-based for the region. */
+ for (i = 0; i < count; ++i) {
+ pio[i].offset -= off_low;
+ }
+
+ ops = g_new0(MemoryRegionOps, 1);
+ ops->old_portio = pio;
+
+ region = g_new(MemoryRegion, 1);
+ memory_region_init_io(region, ops, piolist->opaque, piolist->name,
+ off_high - off_low);
+ memory_region_set_offset(region, start + off_low);
+ memory_region_add_subregion(piolist->address_space,
+ start + off_low, region);
+ piolist->regions[piolist->nr++] = region;
+}
+
+void portio_list_add(PortioList *piolist,
+ MemoryRegion *address_space,
+ uint32_t start)
+{
+ const MemoryRegionPortio *pio, *pio_start = piolist->ports;
+ unsigned int off_low, off_high, off_last, count;
+
+ piolist->address_space = address_space;
+
+ /* Handle the first entry specially. */
+ off_last = off_low = pio_start->offset;
+ off_high = off_low + pio_start->len;
+ count = 1;
+
+ for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
+ /* All entries must be sorted by offset. */
+ assert(pio->offset >= off_last);
+ off_last = pio->offset;
+
+ /* If we see a hole, break the region. */
+ if (off_last > off_high) {
+ portio_list_add_1(piolist, pio_start, count, start, off_low,
+ off_high);
+ /* ... and start collecting anew. */
+ pio_start = pio;
+ off_low = off_last;
+ off_high = off_low + pio->len;
+ count = 0;
+ } else if (off_last + pio->len > off_high) {
+ off_high = off_last + pio->len;
+ }
+ }
+
+ /* There will always be an open sub-list. */
+ portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
+}
+
+void portio_list_del(PortioList *piolist)
+{
+ MemoryRegion *mr;
+ unsigned i;
+
+ for (i = 0; i < piolist->nr; ++i) {
+ mr = piolist->regions[i];
+ memory_region_del_subregion(piolist->address_space, mr);
+ memory_region_destroy(mr);
+ g_free((MemoryRegionOps *)mr->ops);
+ g_free(mr);
+ piolist->regions[i] = NULL;
+ }
+}