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hw/core/or-irq: Support more than 16 inputs to an OR gate

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For the IoTKit MPC support, we need to wire together the
interrupt outputs of 17 MPCs; this exceeds the current
value of MAX_OR_LINES. Increase MAX_OR_LINES to 32 (which
should be enough for anyone).

The tricky part is retaining the migration compatibility for
existing OR gates; we add a subsection which is only used
for larger OR gates, and define it such that we can freely
increase MAX_OR_LINES in future (or even move to a dynamically
allocated levels[] array without an upper size limit) without
breaking compatibility.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20180604152941.20374-10-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-06-15 14:57:14 +01:00
parent 95f875654a
commit f81804a52b
2 changed files with 41 additions and 3 deletions
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5
include/hw/or-irq.h
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@ -31,7 +31,10 @@
#define TYPE_OR_IRQ "or-irq"
#define MAX_OR_LINES 16
/* This can safely be increased if necessary without breaking
* migration compatibility (as long as it remains greater than 15).
*/
#define MAX_OR_LINES 32
typedef struct OrIRQState qemu_or_irq;