Messages in this thread | | | Date | Thu, 15 Jan 1998 16:25:21 +0100 (CET) | From | Felix Schroeter <> | Subject | Re: Using >1GB RAM |
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Hello!
In article <Pine.LNX.3.95.980113215041.23894A-100000@nightshade.z.ml.org> you write: >[...]
>Any datapoints on how other X86 OSes handle this?
OpenBSD doesn't map the whole real memory into its kernel virtual address space. The kernel virtual addresses range from
/* KPTDI<<PDSHIFT */ #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xf0000000)
to
/* APTDPTDI<<PDSHIFT */ #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xffc00000)
making up for a maximum of 0xfc (252) megabytes of kernel virtual address space. Access to physical memory (for /dev/mem or paging) is done using temporary mappings.
Regards, Felix.
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