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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-10-07 09:19:47 +0200 |
|---|---|---|
| committer | Blue Swirl <blauwirbel@gmail.com> | 2011-10-16 11:11:08 +0000 |
| commit | 8d484caa84dbaca5597cfbbf657ebdcd8f06b0c3 (patch) | |
| tree | 3485eb9b6a9c85b9fb36d8c4e75f68e00fe3b1f3 /hw/i8259.c | |
| parent | b76750c1ab50e23ef3ebc8cb6018dda41f174d84 (diff) | |
| download | qemu-8d484caa84dbaca5597cfbbf657ebdcd8f06b0c3.tar.gz qemu-8d484caa84dbaca5597cfbbf657ebdcd8f06b0c3.tar.bz2 qemu-8d484caa84dbaca5597cfbbf657ebdcd8f06b0c3.zip | |
i8259: Fix poll command
This was probably never used so far: According to the spec, polling
means ack'ing the pending IRQ and setting its corresponding bit in isr.
Moreover, we have to signal a pending IRQ via bit 7 of the returned
value, and we must not return a spurious IRQ if none is pending.
This implements the poll command without the help of pic_poll_read which
is left untouched as pic_intack_read is still using it.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'hw/i8259.c')
| -rw-r--r-- | hw/i8259.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/hw/i8259.c b/hw/i8259.c index bb257e642c..31962c0f93 100644 --- a/hw/i8259.c +++ b/hw/i8259.c @@ -393,7 +393,13 @@ static uint64_t pic_ioport_read(void *opaque, target_phys_addr_t addr1, int ret; if (s->poll) { - ret = pic_poll_read(s); + ret = pic_get_irq(s); + if (ret >= 0) { + pic_intack(s, ret); + ret |= 0x80; + } else { + ret = 0; + } s->poll = 0; } else { if (addr == 0) { |