Date: Sat, 12 Dec 1998 11:59:29 +0100 From: Johan Karlsson <k@numeri.campus.luth.se> To: hackers@FreeBSD.ORG Cc: brodnik@sm.luth.se Subject: Special memory with know phys addr -> kernel virt addr Message-ID: <199812121059.LAA11884@numeri.campus.luth.se>
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Hi
I have a special memory, which I try to access using
3.0-current as of 981113, located at physical address from
my_mem_phys_start_addr to my_mem_phys_start_addr.
During the memory scan loop in i386/i386/machdep.c:init386 this memory is
marked as bad and will therefor not be used by the VM.
Now I want to be able to use this memory in the kernel.
This is how I try to do it
==============
phys_size = my_mem_phys_end_addr - my_mem_phys_start_addr;
/*
* Allocate a submap in the kernel virtual memory map
*/
my_mem_kernel_submap =
kmem_suballoc(kernel_map,
&my_mem_kernel_submap_min,
&my_mem_kernel_submap_max,
phys_size);
/*
* Map phys pages into submap
*/
my_mem_virtual_base = my_mem_kernel_submap_min;
my_mem_virtual_top =
pmap_map(my_mem_virtual_base,
my_mem_phys_start_addr,
my_mem_phys_end_addr,
VM_PROT_READ | VM_PROT_WRITE);
===========
The function with this code is runned by
SYSINIT(my_mem, SI_SUB_DRIVERS, SI_ORDER_FIRST, my_mem_init, NULL)
When I reboot my machine with my new kernel it panic printing
"kmem_suballoc: unable to change range to submap"
which is found in vm/vm_kern.c:kmem_suballoc.
I used 2.2.x before but I had to move to 3.0 since I needed some other
functions. When I did the same thing in 2.2.x no panic occured.
Is there somthing wrong with the way I try to do this?
or is there a known problem with kmem_suballoc ?
Thanks for any help with my problem.
/Johan K
--
Johan Karlsson mailto:k@numeri.campus.luth.se
SWEDEN
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