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| author | Joe Komlodi | 2022-06-13 14:05:48 +0200 |
|---|---|---|
| committer | Cédric Le Goater | 2022-06-22 09:49:34 +0200 |
| commit | 4a71d6d32e59ecf02c246037198882e59894db3d (patch) | |
| tree | 088227f509142b907230cfb7aa2bbf8e83704e74 /linux-headers/linux | |
| parent | test/avocado/machine_aspeed.py: Add an I2C RTC test (diff) | |
| download | qemu-4a71d6d32e59ecf02c246037198882e59894db3d.tar.gz qemu-4a71d6d32e59ecf02c246037198882e59894db3d.tar.xz qemu-4a71d6d32e59ecf02c246037198882e59894db3d.zip | |
hw/registerfields: Add shared fields macros
Occasionally a peripheral will have different operating modes, where the
MMIO layout changes, but some of the register fields have the same offsets
and behaviors.
To help support this, we add SHARED_FIELD_XX macros that create SHIFT,
LENGTH, and MASK macros for the fields that are shared across registers,
and accessors for these fields.
An example use may look as follows:
There is a peripheral with registers REG_MODE1 and REG_MODE2 at
different addreses, and both have a field FIELD1 initialized by
SHARED_FIELD().
Depending on what mode the peripheral is operating in, the user could
extract FIELD1 via
SHARED_ARRAY_FIELD_EX32(s->regs, R_REG_MODE1, FIELD1)
or
SHARED_ARRAY_FIELD_EX32(s->regs, R_REG_MODE2, FIELD1)
Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: Id3dc53e7d2f8741c95697cbae69a81bb699fa3cb
Message-Id: <20220331043248.2237838-2-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Diffstat (limited to 'linux-headers/linux')
0 files changed, 0 insertions, 0 deletions