Alexander Funcke wrote:

> In the cpu_setup for the CPU (National Geode SCx200) want to map a few Kb at 
> 0x4000000 in physical memory till virtual kernel memory. 
> 
> How shall go about?
> 
> I tried to alloc kernel memory adresses through uvm_km_valloc() but I only get
> pagefaults.

This snippet is from the sommerfeld_i386mp_1 branch:

/*
 * Map a chunk of memory read-only and return an appropraitely
 * const'ed pointer.
 */

static const void *
mpbios_map (pa, len, handle)
        paddr_t pa;
        int len;
        struct mp_map *handle;
{
        paddr_t pgpa = i386_trunc_page(pa);
        paddr_t endpa = i386_round_page(pa + len);
        vaddr_t va = uvm_km_valloc(kernel_map, endpa - pgpa);
        vaddr_t retva = va + (pa & PGOFSET);
        
        handle->pa = pa;
        handle->pg = pgpa;
        handle->psize = len;
        handle->baseva = va;
        handle->vsize = endpa-pgpa;

        do {
                pmap_kenter_pa (va, pgpa, VM_PROT_READ);
                va += NBPG;
                pgpa += NBPG;
        } while (pgpa < endpa);

        return (const void *)retva;
}

inline static void
mpbios_unmap (handle)
        struct mp_map *handle;
{
        pmap_kremove (handle->baseva, handle->vsize);
        uvm_km_free (kernel_map, handle->baseva, handle->vsize);
}

	-- Gregory McGarry <g.mcgarry@ieee.org>