Hi, What is the memmap equivalent of Linux in FreeBSD?
In Linux memmap is used to reserve a portion of physical memory. This is used as a kernel boot argument. E.g.: memmap=2G$1G will reserve 1GB memory above 2GB, incase I have 3GB RAM. This 1GB reserved memory is not visible to the OS, however this 1GB can be used using ioremap. How can I reserve memory in FreeBSD and later use it i.e memmap and ioremap equivalent? I have tried using hw.physmem loader parameter. I have 3 GB system memory and I have set hw.physmem=2G. sysctl -a shows: hw.physmem: 2.12G hw.usermem: 1.9G hw.realmem: 2.15G devinfo -rv shows: ram0: 0x00-0x9f3ff 0x10000000-0xbfedffff 0xbff00000-0xbfffffff Here, looks like it is showing the full 3 GB mapping. Now, how do I know which is that 1 GB available memory (In Linux, this memory is shown as reserved in /proc/iomem under System RAM) ? Also, which function(similar to ioremap) should I call to map the physical address to virtual address? Thanks. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
