>Looking in arch/i386/mm/ioremap.c, it says that the functions prefixed >with 'remap_area' are primarily for remapping a high PCI range to kernel >space. Where as the ioremap function are for remapping any high memory >area to kernel space. what's this high memory means? Address > 0xA0000 ? i was intend to use this share memory in users space.can i pass the pointer getting from ioremap to user space by using ioctl()? >These functions are to be called once to cause linux to perform a >remapping. >The functions phys_to_virt and virt_to_phys are faster one line >functions defined in include/asm-i386/page.h. and accessible in io.h, >but they do not remap to kernel space so that a Linux program can access >the the memory range. They just convert one address per function call. >Looking at the driver, drivers/net/wan/cycx_drv.c, shows an ISA device >using ioremap. i can't find it in my drivers/net/, can you send a copy for me. >- Cheers,Kal. >Tomasz Motylewski wrote: > > > > > How can i do this, can i use ioremap/iounmap function in my driver? > > > > > > Yes, these are the correct functions to use in your device driver. > > Just looking in arcnet driver shows that phys_to_virt is used like: > > union ArcPacket *arcpacket = (union ArcPacket *) phys_to_virt(dev->mem_start > + recbuf * 512); > > saddr = arcpacket->hardheader.source; > > dev->mem_start is usually around 0xd0000. ioremap/iounmap are probably used > rather for PCI memory (high addresses). > > -- > Tomek -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/ ___________________________________________________________________ 推荐！EaseBand( http://easeband.163.com )让你轻松上网。 ___________________________________________________________________ 推荐！EaseBand( http://easeband.163.com )让你轻松上网。 -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/
