/*
* Map a user I/O request into kernel virtual address space.
*/
int
vmapbuf(struct buf *bp, vsize_t len)
{
vaddr_t kva; /* Kernel VA (new to) */
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
vaddr_t uva = mips_trunc_page(bp->b_data);
const vaddr_t off = (vaddr_t)bp->b_data - uva;
len = mips_round_page(off + len);
kva = uvm_km_alloc(phys_map, len, atop(uva) & uvmexp.colormask,
UVM_KMF_VAONLY | UVM_KMF_WAITVA | UVM_KMF_COLORMATCH);
KASSERT((atop(kva ^ uva) & uvmexp.colormask) == 0);
bp->b_saveaddr = bp->b_data;
bp->b_data = (void *)(kva + off);
struct pmap * const upmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
do {
paddr_t pa; /* physical address */
if (pmap_extract(upmap, uva, &pa) == false)
panic("vmapbuf: null page frame");
pmap_kenter_pa(kva, pa, VM_PROT_READ | VM_PROT_WRITE,
PMAP_WIRED);
uva += PAGE_SIZE;
kva += PAGE_SIZE;
len -= PAGE_SIZE;
} while (len);
pmap_update(pmap_kernel());
return 0;
}
void
dmac3_start(struct dmac3_softc *sc, vaddr_t addr, int len, int direction)
{
struct dmac3reg *reg = sc->sc_reg;
paddr_t pa;
vaddr_t start, end, v;
volatile uint32_t *p;
if (reg->csr & DMAC3_CSR_ENABLE)
dmac3_reset(sc);
start = mips_trunc_page(addr);
end = mips_round_page(addr + len);
p = sc->sc_dmamap;
for (v = start; v < end; v += PAGE_SIZE) {
pa = kvtophys(v);
mips_dcache_wbinv_range(MIPS_PHYS_TO_KSEG0(pa), PAGE_SIZE);
*p++ = 0;
*p++ = (pa >> PGSHIFT) | 0xc0000000;
}
*p++ = 0;
*p++ = 0x003fffff;
addr &= PGOFSET;
addr += sc->sc_dmaaddr;
reg->len = len;
reg->addr = addr;
reg->intr = DMAC3_INTR_EOPIE | DMAC3_INTR_INTEN;
reg->csr = DMAC3_CSR_ENABLE | direction | BURST_MODE | APAD_MODE;
}
/*
* Unmap a previously-mapped user I/O request.
*/
void
vunmapbuf(struct buf *bp, vsize_t len)
{
vaddr_t kva;
if ((bp->b_flags & B_PHYS) == 0)
panic("vunmapbuf");
kva = mips_trunc_page(bp->b_data);
len = mips_round_page((vaddr_t)bp->b_data - kva + len);
pmap_kremove(kva, len);
pmap_update(pmap_kernel());
uvm_km_free(phys_map, kva, len, UVM_KMF_VAONLY);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = NULL;
}
