void
physunaccess(void *vaddr, int size)
{
pt_entry_t *pte;
pte = kvtopte(vaddr);
for (size = btoc(size); size; size--)
*pte++ = PG_NV;
TBIAS();
}
/*
* Map `size' bytes of physical memory starting at `paddr' into
* kernel VA space at `vaddr'. Read/write and cache-inhibit status
* are specified by `prot'.
*/
void
physaccess(void *vaddr, void *paddr, int size, int prot)
{
pt_entry_t *pte;
u_int page;
pte = kvtopte(vaddr);
page = (u_int)paddr & PG_FRAME;
for (size = btoc(size); size; size--) {
*pte++ = PG_V | prot | page;
page += PAGE_SIZE;
}
TBIAS();
}
/*
* Common function for mapping DMA-safe memory. May be called by
* bus-specific DMA memory map functions.
*/
int
_bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs,
size_t size, void **kvap, int flags)
{
vaddr_t va;
bus_addr_t addr;
int curseg;
const uvm_flag_t kmflags =
(flags & BUS_DMA_NOWAIT) != 0 ? UVM_KMF_NOWAIT : 0;
size = round_page(size);
va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY | kmflags);
if (va == 0)
return ENOMEM;
*kvap = (void *)va;
for (curseg = 0; curseg < nsegs; curseg++) {
for (addr = segs[curseg].ds_addr;
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
addr += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE) {
if (size == 0)
panic("_bus_dmamem_map: size botch");
pmap_enter(pmap_kernel(), va, addr,
VM_PROT_READ | VM_PROT_WRITE,
VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
/* Cache-inhibit the page if necessary */
if ((flags & BUS_DMA_COHERENT) != 0)
_pmap_set_page_cacheinhibit(pmap_kernel(), va);
segs[curseg]._ds_flags &= ~BUS_DMA_COHERENT;
segs[curseg]._ds_flags |= (flags & BUS_DMA_COHERENT);
}
}
pmap_update(pmap_kernel());
if ((flags & BUS_DMA_COHERENT) != 0)
TBIAS();
return 0;
}
