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-rw-r--r--hw/i386/pc.c57
1 files changed, 55 insertions, 2 deletions
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 6f1b137030..09635cd806 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -334,6 +334,41 @@ typedef struct pc_cmos_init_late_arg {
BusState *idebus[2];
} pc_cmos_init_late_arg;
+typedef struct check_fdc_state {
+ ISADevice *floppy;
+ bool multiple;
+} CheckFdcState;
+
+static int check_fdc(Object *obj, void *opaque)
+{
+ CheckFdcState *state = opaque;
+ Object *fdc;
+ uint32_t iobase;
+ Error *local_err = NULL;
+
+ fdc = object_dynamic_cast(obj, TYPE_ISA_FDC);
+ if (!fdc) {
+ return 0;
+ }
+
+ iobase = object_property_get_int(obj, "iobase", &local_err);
+ if (local_err || iobase != 0x3f0) {
+ error_free(local_err);
+ return 0;
+ }
+
+ if (state->floppy) {
+ state->multiple = true;
+ } else {
+ state->floppy = ISA_DEVICE(obj);
+ }
+ return 0;
+}
+
+static const char * const fdc_container_path[] = {
+ "/unattached", "/peripheral", "/peripheral-anon"
+};
+
static void pc_cmos_init_late(void *opaque)
{
pc_cmos_init_late_arg *arg = opaque;
@@ -342,6 +377,8 @@ static void pc_cmos_init_late(void *opaque)
int8_t heads, sectors;
int val;
int i, trans;
+ Object *container;
+ CheckFdcState state = { 0 };
val = 0;
if (ide_get_geometry(arg->idebus[0], 0,
@@ -371,6 +408,23 @@ static void pc_cmos_init_late(void *opaque)
}
rtc_set_memory(s, 0x39, val);
+ /*
+ * Locate the FDC at IO address 0x3f0, and configure the CMOS registers
+ * accordingly.
+ */
+ for (i = 0; i < ARRAY_SIZE(fdc_container_path); i++) {
+ container = container_get(qdev_get_machine(), fdc_container_path[i]);
+ object_child_foreach(container, check_fdc, &state);
+ }
+
+ if (state.multiple) {
+ error_report("warning: multiple floppy disk controllers with "
+ "iobase=0x3f0 have been found;\n"
+ "the one being picked for CMOS setup might not reflect "
+ "your intent");
+ }
+ pc_cmos_init_floppy(s, state.floppy);
+
qemu_unregister_reset(pc_cmos_init_late, opaque);
}
@@ -440,9 +494,8 @@ void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
val |= 0x02; /* FPU is there */
val |= 0x04; /* PS/2 mouse installed */
rtc_set_memory(s, REG_EQUIPMENT_BYTE, val);
- pc_cmos_init_floppy(s, floppy);
- /* hard drives */
+ /* hard drives and FDC */
arg.rtc_state = s;
arg.idebus[0] = idebus0;
arg.idebus[1] = idebus1;