This revises vm_map_region() by accepting unaligned paddr, which is
aligned-down before mapping and in-page offset is then added to vaddr
before returning. It also moves vm_map_region() and vm_unmap_region()
to vm_region.c.
Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
This patch adds definitions to support user space device mappings
that allows devices like frame buffer to be accessible from user
space in kernel mode.
The are mainly two changes:
- in `mm/`:
added vm_map_region(), vm_unmap_region() for drivers to do
device mapping easily.
- in `arch/`:
extended ARCH_SHM_NPAGES as user-space mapping region size.
decoupled ARCH_SHM_MAXREGIONS from region size calculations and
limit its usage only for SysV shm purposes.
Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
ctc E246: ["map/mm_map.c" 67/41] left side of '.' or '->' is not struct or union
ctc E260: ["map/mm_map.c" 67/25] not an lvalue
ctc E246: ["map/mm_map.c" 80/3] left side of '.' or '->' is not struct or union
ctc E260: ["map/mm_map.c" 80/3] not an lvalue
Signed-off-by: chao an <anchao@lixiang.com>
No memory map count limit that will exhaust memory and cause
the system hang. Also that fix pass LTP posix case mmap/24-1.c
Signed-off-by: fangxinyong <fangxinyong@xiaomi.com>
1. Update all CMakeLists.txt to adapt to new layout
2. Fix cmake build break
3. Update all new file license
4. Fully compatible with current compilation environment(use configure.sh or cmake as you choose)
------------------
How to test
From within nuttx/. Configure:
cmake -B build -DBOARD_CONFIG=sim/nsh -GNinja
cmake -B build -DBOARD_CONFIG=sim:nsh -GNinja
cmake -B build -DBOARD_CONFIG=sabre-6quad/smp -GNinja
cmake -B build -DBOARD_CONFIG=lm3s6965-ek/qemu-flat -GNinja
(or full path in custom board) :
cmake -B build -DBOARD_CONFIG=$PWD/boards/sim/sim/sim/configs/nsh -GNinja
This uses ninja generator (install with sudo apt install ninja-build). To build:
$ cmake --build build
menuconfig:
$ cmake --build build -t menuconfig
--------------------------
2. cmake/build: reformat the cmake style by cmake-format
https://github.com/cheshirekow/cmake_format
$ pip install cmakelang
$ for i in `find -name CMakeLists.txt`;do cmake-format $i -o $i;done
$ for i in `find -name *\.cmake`;do cmake-format $i -o $i;done
Co-authored-by: Matias N <matias@protobits.dev>
Signed-off-by: chao an <anchao@xiaomi.com>
This way the mappings can be modified for any vm area, not only the
process that is running.
Why? This allows mapping pages to kernel dynamically, this functionality
will be presented later.
The task_group specific list can be used to store information about
mmappings.
For a driver or filesystem performing mmap can also enable munmap by
adding an item to this list using mm_map_add(). The item is then
returned in the corresponding munmap call.
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
