Hi, This series introduce the memory_region_add_subregion_aliased() helper which basically create a device which maps a subregion multiple times.
Since v1: - Split series in 2, keeping the I/O regions (showed with the q800 machine) part for 2nd part - Added R-b tags Examples are easier, so having a subregion aliased every @span_size then mapped onto a container at an offset, you get something like: ^-----------^ | | | | | +-------+ | +---------+ <--+ | | +---------+ | | | | | | | | +-----------> | alias#3 | | | | | | | | | | | +---------+ | | | | +---------+ | | | | | | | | | | +-------> | alias#2 | | | | | | | | |region | container | | | +---------+ | size | | | | +---------+ | | | | | | | | | | | | +----> | alias#1 | | | | | | | | | | | | | | | +---------+ <--+ | | | +-+---+--+--+ +---------+ | | | | | | | | |span | | | | subregion +-> | alias#0 | |size | offset | | | | | | | | +----> | +-------+ | +-----------+ +---------+ <--+ <--+ | | | | | | | | | | | | | | | | ^-----------^ I know it need more documentation and tests, but I prefer to send as draft RFC for early review before spending more time on it. Supersedes: <20210326002728.1069834-1-f4...@amsat.org> Based-on: <20210325120921.858993-1-f4...@amsat.org> https://www.mail-archive.com/qemu-devel@nongnu.org/msg795218.html Philippe Mathieu-Daudé (7): hw/misc: Add device to help managing aliased memory regions hw/arm/musicpal: Open-code pflash_cfi02_register() call hw/arm/musicpal: Map flash using memory_region_add_subregion_aliased() hw/arm/digic: Open-code pflash_cfi02_register() call hw/arm/digic: Map flash using memory_region_add_subregion_aliased() hw/block/pflash_cfi02: Remove pflash_setup_mappings() hw/block/pflash_cfi02: Simplify pflash_cfi02_register() prototype include/hw/block/flash.h | 1 - include/hw/misc/aliased_region.h | 87 ++++++++++++++++++++ hw/arm/digic_boards.c | 28 +++++-- hw/arm/musicpal.c | 29 +++++-- hw/arm/xilinx_zynq.c | 2 +- hw/block/pflash_cfi02.c | 36 +-------- hw/lm32/lm32_boards.c | 4 +- hw/misc/aliased_region.c | 132 +++++++++++++++++++++++++++++++ hw/ppc/ppc405_boards.c | 6 +- hw/sh4/r2d.c | 2 +- MAINTAINERS | 6 ++ hw/arm/Kconfig | 2 + hw/misc/Kconfig | 3 + hw/misc/meson.build | 1 + 14 files changed, 285 insertions(+), 54 deletions(-) create mode 100644 include/hw/misc/aliased_region.h create mode 100644 hw/misc/aliased_region.c -- 2.26.3