i8259: PREP: Replace pic_intack_read with pic_read_irq

There is nothing in the i8259 spec that justifies the special
pic_intack_read. At least the Linux PREP kernels configure the PICs
properly so that pic_read_irq returns identical values, and setting
read_reg_select in PIC0 cannot be derived from any special i8259 mode.

So switch ppc_prep to pic_read_irq and drop the now unused PIC code.

CC: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/hw/pc.h b/hw/pc.h
index 5d20d581e3..f0b31de9f7 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -65,7 +65,6 @@ extern PicState2 *isa_pic;
 qemu_irq *i8259_init(qemu_irq parent_irq);
 int pic_read_irq(PicState2 *s);
 int pic_get_output(PicState2 *s);
-uint32_t pic_intack_read(PicState2 *s);
 void pic_info(Monitor *mon);
 void irq_info(Monitor *mon);