feat(guests/linux): add mmap interface for bao ipc in Linux

[clachan]

The follow code snippet shows how to use it:

int fd = open("/dev/baoipc0", O_RDWR); char ipcshmem_read = (char )mmap(NULL, 0x2000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); char ipcshmem_write = (char )mmap(NULL, 0x2000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x2000);

// direct pointer access

munmap(ipcshmem_read, 0x2000); munmap(ipcshmem_write, 0x2000);

[clachan]

Hi,

I implemented the mmap interface for my own purpose, and think it may benefit others. Please review. Any comments are welcome.

Thanks, Clay

[josecm]

Thanks for the PR @clachan. Although this is not used in the demo, it is very useful as a reference. However, in the near future, we want to clearly design and specify support for using Bao IPC shared memory (maybe using some already existing protocol) and provide the kernel module on its own repo. If you have any interest in contributing in this sense, please let us know!

[clachan]

Thanks for the PR @clachan. Although this is not used in the demo, it is very useful as a reference. However, in the near future, we want to clearly design and specify support for using Bao IPC shared memory (maybe using some already existing protocol) and provide the kernel module on its own repo. If you have any interest in contributing in this sense, please let us know!

Yes, I am interested. Please let me know the plan when appropriate. Looking forward to contributing more.