diff options
Diffstat (limited to 'sys/arch/hppa/dev')
| -rw-r--r-- | sys/arch/hppa/dev/astro.c | 708 |
1 files changed, 708 insertions, 0 deletions
diff --git a/sys/arch/hppa/dev/astro.c b/sys/arch/hppa/dev/astro.c new file mode 100644 index 00000000000..b163f89edf1 --- /dev/null +++ b/sys/arch/hppa/dev/astro.c @@ -0,0 +1,708 @@ +/* $OpenBSD: astro.c,v 1.1 2007/05/21 19:33:09 kettenis Exp $ */ + +/* + * Copyright (c) 2007 Mark Kettenis + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/device.h> +#include <sys/extent.h> +#include <sys/malloc.h> +#include <sys/reboot.h> +#include <sys/tree.h> + +#include <uvm/uvm_extern.h> + +#include <machine/iomod.h> +#include <machine/autoconf.h> + +#include <hppa/dev/cpudevs.h> + +struct astro_regs { + u_int32_t rid; + u_int32_t pad0000; + u_int32_t ioc_ctrl; + u_int32_t pad0008; + u_int64_t resv1[0x4400 - 0x2]; + u_int64_t func_id; + u_int64_t func_class; + u_int64_t resv2[0x60 - 0x2]; + u_int32_t tlb_ibase; + u_int32_t pad22300; + u_int32_t tlb_imask; + u_int32_t pad22308; + u_int32_t tlb_pcom; + u_int32_t pad22310; + u_int32_t tlb_tcnfg; + u_int32_t pad22318; + u_int64_t tlb_pdir_base; +}; + +#define ASTRO_IOC_CTRL_TE 0x0001 /* TOC Enable */ +#define ASTRO_IOC_CTRL_CE 0x0002 /* Coalesce Enable */ +#define ASTRO_IOC_CTRL_DE 0x0004 /* Dillon Enable */ +#define ASTRO_IOC_CTRL_IE 0x0008 /* IOS Enable */ +#define ASTRO_IOC_CTRL_OS 0x0010 /* Outbound Synchronous */ +#define ASTRO_IOC_CTRL_IS 0x0020 /* Inbound Synchronous */ +#define ASTRO_IOC_CTRL_RC 0x0040 /* Read Current Enable */ +#define ASTRO_IOC_CTRL_L0 0x0080 /* 0-length Read Enable */ +#define ASTRO_IOC_CTRL_RM 0x0100 /* Real Mode */ +#define ASTRO_IOC_CTRL_NC 0x0200 /* Non-coherent Mode */ +#define ASTRO_IOC_CTRL_ID 0x0400 /* Interrupt Disable */ +#define ASTRO_IOC_CTRL_D4 0x0800 /* Disable 4-byte Coalescing */ +#define ASTRO_IOC_CTRL_CC 0x1000 /* Increase Coalescing counter value */ +#define ASTRO_IOC_CTRL_DD 0x2000 /* Disable distr. range coalescing */ +#define ASTRO_IOC_CTRL_DC 0x4000 /* Disable the coalescing counter */ + +#define IOTTE_V 0x8000000000000000LL /* Entry valid */ +#define IOTTE_PAMASK 0x000000fffffff000LL +#define IOTTE_CI 0x00000000000000ffLL /* Coherent index */ + +struct astro_softc { + struct device sc_dv; + + bus_dma_tag_t sc_dmat; + struct astro_regs volatile *sc_regs; + u_int64_t *sc_pdir; + + char sc_dvmamapname[20]; + struct extent *sc_dvmamap; + struct hppa_bus_dma_tag sc_dmatag; +}; + +/* + * per-map DVMA page table + */ +struct iommu_page_entry { + SPLAY_ENTRY(iommu_page_entry) ipe_node; + paddr_t ipe_pa; + vaddr_t ipe_va; + bus_addr_t ipe_dva; +}; + +struct iommu_page_map { + SPLAY_HEAD(iommu_page_tree, iommu_page_entry) ipm_tree; + int ipm_maxpage; /* Size of allocated page map */ + int ipm_pagecnt; /* Number of entries in use */ + struct iommu_page_entry ipm_map[1]; +}; + +/* + * per-map IOMMU state + */ +struct iommu_map_state { + struct astro_softc *ims_sc; + bus_addr_t ims_dvmastart; + bus_size_t ims_dvmasize; + struct iommu_page_map ims_map; /* map must be last (array at end) */ +}; + +int astro_match(struct device *, void *, void *); +void astro_attach(struct device *, struct device *, void *); + +struct cfattach astro_ca = { + sizeof(struct astro_softc), astro_match, astro_attach +}; + +struct cfdriver astro_cd = { + NULL, "astro", DV_DULL +}; + +int iommu_dvmamap_create(void *, bus_size_t, int, bus_size_t, bus_size_t, + int, bus_dmamap_t *); +void iommu_dvmamap_destroy(void *, bus_dmamap_t); +int iommu_dvmamap_load(void *, bus_dmamap_t, void *, bus_size_t, + struct proc *, int); +int iommu_dvmamap_load_mbuf(void *, bus_dmamap_t, struct mbuf *, int); +int iommu_dvmamap_load_uio(void *, bus_dmamap_t, struct uio *, int); +int iommu_dvmamap_load_raw(void *, bus_dmamap_t, bus_dma_segment_t *, + int, bus_size_t, int); +void iommu_dvmamap_unload(void *, bus_dmamap_t); +void iommu_dvmamap_sync(void *, bus_dmamap_t, bus_addr_t, bus_size_t, int); +int iommu_dvmamem_alloc(void *, bus_size_t, bus_size_t, bus_size_t, + bus_dma_segment_t *, int, int *, int); +void iommu_dvmamem_free(void *, bus_dma_segment_t *, int); +int iommu_dvmamem_map(void *, bus_dma_segment_t *, int, size_t, + caddr_t *, int); +void iommu_dvmamem_unmap(void *, caddr_t, size_t); +paddr_t iommu_dvmamem_mmap(void *, bus_dma_segment_t *, int, off_t, int, int); + +void iommu_enter(struct astro_softc *, bus_addr_t, paddr_t, vaddr_t, int); +void iommu_remove(struct astro_softc *, bus_addr_t); + +struct iommu_map_state *iommu_iomap_create(int); +void iommu_iomap_destroy(struct iommu_map_state *); +int iommu_iomap_insert_page(struct iommu_map_state *, vaddr_t, paddr_t); +bus_addr_t iommu_iomap_translate(struct iommu_map_state *, paddr_t); +void iommu_iomap_clear_pages(struct iommu_map_state *); + +const struct hppa_bus_dma_tag astro_dmat = { + NULL, + iommu_dvmamap_create, iommu_dvmamap_destroy, + iommu_dvmamap_load, iommu_dvmamap_load_mbuf, + iommu_dvmamap_load_uio, iommu_dvmamap_load_raw, + iommu_dvmamap_unload, iommu_dvmamap_sync, + + iommu_dvmamem_alloc, iommu_dvmamem_free, iommu_dvmamem_map, + iommu_dvmamem_unmap, iommu_dvmamem_mmap +}; + +int +astro_match(struct device *parent, void *cfdata, void *aux) +{ + struct confargs *ca = aux; + + /* Astro is a U-Turn variant. */ + if (ca->ca_type.iodc_type != HPPA_TYPE_IOA || + ca->ca_type.iodc_sv_model != HPPA_IOA_UTURN) + return 0; + + if (ca->ca_type.iodc_model == 0x58 && + ca->ca_type.iodc_revision >= 0x20) + return 1; + + return 0; +} + +void +astro_attach(struct device *parent, struct device *self, void *aux) +{ + struct confargs *ca = aux, nca; + struct astro_softc *sc = (struct astro_softc *)self; + volatile struct astro_regs *r; + bus_space_handle_t ioh; + u_int32_t rid, ioc_ctrl; + psize_t size; + vaddr_t va; + paddr_t pa; + struct vm_page *m; + struct pglist mlist; + int iova_bits; + + sc->sc_dmat = ca->ca_dmatag; + if (bus_space_map(ca->ca_iot, ca->ca_hpa, sizeof(struct astro_regs), + 0, &ioh)) { + printf(": can't map IO space\n"); + return; + } + sc->sc_regs = r = (struct astro_regs *)ca->ca_hpa; + + rid = letoh32(r->rid); + printf(": Astro rev %d.%d\n", (rid & 7) + 1, (rid >> 3) & 3); + + ioc_ctrl = letoh32(r->ioc_ctrl); + ioc_ctrl &= ~ASTRO_IOC_CTRL_CE; + ioc_ctrl &= ~ASTRO_IOC_CTRL_RM; + ioc_ctrl &= ~ASTRO_IOC_CTRL_NC; + r->ioc_ctrl = htole32(ioc_ctrl); + + /* + * Setup the iommu. + */ + + /* XXX This gives us 256MB of iova space. */ + iova_bits = 28; + + r->tlb_ibase = htole32(0); + r->tlb_imask = htole32(0xffffffff << iova_bits); + + /* Page size is 4K. */ + r->tlb_tcnfg = htole32(0); + + /* Flush TLB. */ + r->tlb_pcom = htole32(31); + + /* + * Allocate memort for I/O pagetables. They need to be physically + * contiguous. + */ + + size = (1 << (iova_bits - PAGE_SHIFT)) * sizeof(u_int64_t); + TAILQ_INIT(&mlist); + if (uvm_pglistalloc(size, 0, -1, PAGE_SIZE, 0, &mlist, 1, 0) != 0) + panic("astrottach: no memory"); + + va = uvm_km_valloc(kernel_map, size); + if (va == 0) + panic("astroattach: no memory"); + sc->sc_pdir = (u_int64_t *)va; + + m = TAILQ_FIRST(&mlist); + r->tlb_pdir_base = htole64(VM_PAGE_TO_PHYS(m)); + + /* Map the pages. */ + for (; m != NULL; m = TAILQ_NEXT(m, pageq)) { + pa = VM_PAGE_TO_PHYS(m); + pmap_enter(pmap_kernel(), va, pa, + VM_PROT_READ|VM_PROT_WRITE, PMAP_WIRED); + va += PAGE_SIZE; + } + pmap_update(pmap_kernel()); + memset(sc->sc_pdir, 0, size); + + /* Enable iova space. */ + r->tlb_ibase = htole32(1); + + /* + * Now all the hardware's working we need to allocate a dvma map. + */ + snprintf(sc->sc_dvmamapname, sizeof(sc->sc_dvmamapname), + "%s_dvma", sc->sc_dv.dv_xname); + sc->sc_dvmamap = extent_create(sc->sc_dvmamapname, 0, (1 << iova_bits), + M_DEVBUF, 0, 0, EX_NOWAIT); + + sc->sc_dmatag = astro_dmat; + sc->sc_dmatag._cookie = sc; + + nca = *ca; /* clone from us */ + nca.ca_hpamask = HPPA_IOBEGIN; + nca.ca_dmatag = &sc->sc_dmatag; + pdc_scanbus(self, &nca, MAXMODBUS, 0); +} + +int +iommu_dvmamap_create(void *v, bus_size_t size, int nsegments, + bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamap) +{ + struct astro_softc *sc = v; + bus_dmamap_t map; + struct iommu_map_state *ims; + int error; + + error = bus_dmamap_create(sc->sc_dmat, size, nsegments, maxsegsz, + boundary, flags, &map); + if (error) + return (error); + + ims = iommu_iomap_create(atop(round_page(size))); + if (ims == NULL) { + bus_dmamap_destroy(sc->sc_dmat, map); + return (ENOMEM); + } + + ims->ims_sc = sc; + map->_dm_cookie = ims; + *dmamap = map; + + return (0); +} + +void +iommu_dvmamap_destroy(void *v, bus_dmamap_t map) +{ + struct astro_softc *sc = v; + + /* + * The specification (man page) requires a loaded + * map to be unloaded before it is destroyed. + */ + if (map->dm_nsegs) + bus_dmamap_unload(sc->sc_dmat, map); + + if (map->_dm_cookie) + iommu_iomap_destroy(map->_dm_cookie); + map->_dm_cookie = NULL; + + bus_dmamap_destroy(sc->sc_dmat, map); +} + +int +iommu_iomap_load_map(struct astro_softc *sc, bus_dmamap_t map, int flags) +{ + struct iommu_map_state *ims = map->_dm_cookie; + struct iommu_page_map *ipm = &ims->ims_map; + struct iommu_page_entry *e; + int err, seg, s; + paddr_t pa, paend; + vaddr_t va; + bus_size_t sgsize; + bus_size_t align, boundary; + u_long dvmaddr; + bus_addr_t dva; + int i; + + /* XXX */ + boundary = map->_dm_boundary; + align = PAGE_SIZE; + + iommu_iomap_clear_pages(ims); + + for (seg = 0; seg < map->dm_nsegs; seg++) { + struct hppa_bus_dma_segment *ds = &map->dm_segs[seg]; + + paend = round_page(ds->ds_addr + ds->ds_len); + for (pa = trunc_page(ds->ds_addr), va = trunc_page(ds->_ds_va); + pa < paend; pa += PAGE_SIZE, va += PAGE_SIZE) { + err = iommu_iomap_insert_page(ims, va, pa); + if (err) { + printf("iomap insert error: %d for " + "va 0x%lx pa 0x%lx\n", err, va, pa); + bus_dmamap_unload(sc->sc_dmat, map); + iommu_iomap_clear_pages(ims); + } + } + } + + sgsize = ims->ims_map.ipm_pagecnt * PAGE_SIZE; + s = splhigh(); + err = extent_alloc(sc->sc_dvmamap, sgsize, align, 0, boundary, + EX_NOWAIT | EX_BOUNDZERO, &dvmaddr); + splx(s); + if (err) + return (err); + + ims->ims_dvmastart = dvmaddr; + ims->ims_dvmasize = sgsize; + + dva = dvmaddr; + for (i = 0, e = ipm->ipm_map; i < ipm->ipm_pagecnt; ++i, ++e) { + e->ipe_dva = dva; + iommu_enter(sc, e->ipe_dva, e->ipe_pa, e->ipe_va, flags); + dva += PAGE_SIZE; + } + + for (seg = 0; seg < map->dm_nsegs; seg++) { + struct hppa_bus_dma_segment *ds = &map->dm_segs[seg]; + ds->ds_addr = iommu_iomap_translate(ims, ds->ds_addr); + } + + return (0); +} + +int +iommu_dvmamap_load(void *v, bus_dmamap_t map, void *addr, bus_size_t size, + struct proc *p, int flags) +{ + struct astro_softc *sc = v; + int err; + + err = bus_dmamap_load(sc->sc_dmat, map, addr, size, p, flags); + if (err) + return (err); + + return iommu_iomap_load_map(sc, map, flags); +} + +int +iommu_dvmamap_load_mbuf(void *v, bus_dmamap_t map, struct mbuf *m, int flags) +{ + struct astro_softc *sc = v; + int err; + + err = bus_dmamap_load_mbuf(sc->sc_dmat, map, m, flags); + if (err) + return (err); + + return iommu_iomap_load_map(sc, map, flags); +} + +int +iommu_dvmamap_load_uio(void *v, bus_dmamap_t map, struct uio *uio, int flags) +{ + struct astro_softc *sc = v; + + printf("load_uio\n"); + + return (bus_dmamap_load_uio(sc->sc_dmat, map, uio, flags)); +} + +int +iommu_dvmamap_load_raw(void *v, bus_dmamap_t map, bus_dma_segment_t *segs, + int nsegs, bus_size_t size, int flags) +{ + struct astro_softc *sc = v; + + printf("load_raw\n"); + + return (bus_dmamap_load_raw(sc->sc_dmat, map, segs, nsegs, size, flags)); +} + +void +iommu_dvmamap_unload(void *v, bus_dmamap_t map) +{ + struct astro_softc *sc = v; + struct iommu_map_state *ims = map->_dm_cookie; + struct iommu_page_map *ipm = &ims->ims_map; + struct iommu_page_entry *e; + int err, i, s; + + bus_dmamap_unload(sc->sc_dmat, map); + + /* XXX */ + if (ims->ims_dvmasize == 0) + return; + + for (i = 0, e = ipm->ipm_map; i < ipm->ipm_pagecnt; ++i, ++e) + iommu_remove(sc, e->ipe_dva); + + s = splhigh(); + err = extent_free(sc->sc_dvmamap, ims->ims_dvmastart, + ims->ims_dvmasize, EX_NOWAIT); + ims->ims_dvmastart = 0; + ims->ims_dvmasize = 0; + splx(s); + if (err) + printf("warning: %ld of DVMA space lost\n", ims->ims_dvmasize); +} + +void +iommu_dvmamap_sync(void *v, bus_dmamap_t map, bus_addr_t off, + bus_size_t len, int ops) +{ + struct astro_softc *sc = v; + + bus_dmamap_sync(sc->sc_dmat, map, off, len, ops); +} + +int +iommu_dvmamem_alloc(void *v, bus_size_t size, bus_size_t alignment, + bus_size_t boundary, bus_dma_segment_t *segs, + int nsegs, int *rsegs, int flags) +{ + struct astro_softc *sc = v; + + return (bus_dmamem_alloc(sc->sc_dmat, size, alignment, boundary, + segs, nsegs, rsegs, flags)); +} + +void +iommu_dvmamem_free(void *v, bus_dma_segment_t *segs, int nsegs) +{ + struct astro_softc *sc = v; + + bus_dmamem_free(sc->sc_dmat, segs, nsegs); +} + +int +iommu_dvmamem_map(void *v, bus_dma_segment_t *segs, int nsegs, size_t size, + caddr_t *kvap, int flags) +{ + struct astro_softc *sc = v; + + return (bus_dmamem_map(sc->sc_dmat, segs, nsegs, size, kvap, flags)); +} + +void +iommu_dvmamem_unmap(void *v, caddr_t kva, size_t size) +{ + struct astro_softc *sc = v; + + bus_dmamem_unmap(sc->sc_dmat, kva, size); +} + +paddr_t +iommu_dvmamem_mmap(void *v, bus_dma_segment_t *segs, int nsegs, off_t off, + int prot, int flags) +{ + struct astro_softc *sc = v; + + return (bus_dmamem_mmap(sc->sc_dmat, segs, nsegs, off, prot, flags)); +} + +/* + * Utility function used by splay tree to order page entries by pa. + */ +static inline int +iomap_compare(struct iommu_page_entry *a, struct iommu_page_entry *b) +{ + return ((a->ipe_pa > b->ipe_pa) ? 1 : + (a->ipe_pa < b->ipe_pa) ? -1 : 0); +} + +SPLAY_PROTOTYPE(iommu_page_tree, iommu_page_entry, ipe_node, iomap_compare); + +SPLAY_GENERATE(iommu_page_tree, iommu_page_entry, ipe_node, iomap_compare); + +/* + * Create a new iomap. + */ +struct iommu_map_state * +iommu_iomap_create(int n) +{ + struct iommu_map_state *ims; + + /* Safety for heavily fragmented data, such as mbufs */ + n += 4; + if (n < 16) + n = 16; + + ims = malloc(sizeof(*ims) + (n - 1) * sizeof(ims->ims_map.ipm_map[0]), + M_DEVBUF, M_NOWAIT); + if (ims == NULL) + return (NULL); + + memset(ims, 0, sizeof *ims); + + /* Initialize the map. */ + ims->ims_map.ipm_maxpage = n; + SPLAY_INIT(&ims->ims_map.ipm_tree); + + return (ims); +} + +/* + * Destroy an iomap. + */ +void +iommu_iomap_destroy(struct iommu_map_state *ims) +{ +#ifdef DIAGNOSTIC + if (ims->ims_map.ipm_pagecnt > 0) + printf("iommu_iomap_destroy: %d page entries in use\n", + ims->ims_map.ipm_pagecnt); +#endif + + free(ims, M_DEVBUF); +} + +/* + * Insert a pa entry in the iomap. + */ +int +iommu_iomap_insert_page(struct iommu_map_state *ims, vaddr_t va, paddr_t pa) +{ + struct iommu_page_map *ipm = &ims->ims_map; + struct iommu_page_entry *e; + + if (ipm->ipm_pagecnt >= ipm->ipm_maxpage) { + struct iommu_page_entry ipe; + + ipe.ipe_pa = pa; + if (SPLAY_FIND(iommu_page_tree, &ipm->ipm_tree, &ipe)) + return (0); + + return (ENOMEM); + } + + e = &ipm->ipm_map[ipm->ipm_pagecnt]; + + e->ipe_pa = pa; + e->ipe_va = va; + e->ipe_dva = NULL; + + e = SPLAY_INSERT(iommu_page_tree, &ipm->ipm_tree, e); + + /* Duplicates are okay, but only count them once. */ + if (e) + return (0); + + ++ipm->ipm_pagecnt; + + return (0); +} + +/* + * Translate a physical address (pa) into a DVMA address. + */ +bus_addr_t +iommu_iomap_translate(struct iommu_map_state *ims, paddr_t pa) +{ + struct iommu_page_map *ipm = &ims->ims_map; + struct iommu_page_entry *e; + struct iommu_page_entry pe; + paddr_t offset = pa & PAGE_MASK; + + pe.ipe_pa = trunc_page(pa); + + e = SPLAY_FIND(iommu_page_tree, &ipm->ipm_tree, &pe); + + if (e == NULL) { + panic("couldn't find pa %lx\n", pa); + return 0; + } + + return (e->ipe_dva | offset); +} + +/* + * Clear the iomap table and tree. + */ +void +iommu_iomap_clear_pages(struct iommu_map_state *ims) +{ + ims->ims_map.ipm_pagecnt = 0; + SPLAY_INIT(&ims->ims_map.ipm_tree); +} + +/* + * Add an entry to the IOMMU table. + */ +void +iommu_enter(struct astro_softc *sc, bus_addr_t dva, paddr_t pa, vaddr_t va, + int flags) +{ + volatile u_int64_t *tte_ptr = &sc->sc_pdir[dva >> PAGE_SHIFT]; + u_int64_t tte; + u_int32_t ci; + +#ifdef DEBUG + printf("iommu_enter dva %lx, pa %lx, va %lx\n", dva, pa, va); +#endif + +#ifdef DIAGNOSTIC + tte = letoh64(*tte_ptr); + + if (tte & IOTTE_V) { + printf("Overwriting valid tte entry (dva %lx pa %lx " + "&tte %p tte %llx)\n", dva, pa, tte_ptr, tte); + extent_print(sc->sc_dvmamap); + panic("IOMMU overwrite"); + } +#endif + + mtsp(HPPA_SID_KERNEL, 1); + __asm volatile("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (va)); + + tte = (pa & IOTTE_PAMASK) | ((ci >> 12) & IOTTE_CI); + tte |= IOTTE_V; + + *tte_ptr = htole64(tte); + __asm volatile("fdc 0(%%sr1, %0)\n\tsync" : : "r" (tte_ptr)); +} + +/* + * Remove an entry from the IOMMU table. + */ +void +iommu_remove(struct astro_softc *sc, bus_addr_t dva) +{ + volatile struct astro_regs *r = sc->sc_regs; + u_int64_t *tte_ptr = &sc->sc_pdir[dva >> PAGE_SHIFT]; + u_int64_t tte; + +#ifdef DIAGNOSTIC + if (dva != trunc_page(dva)) { + printf("iommu_remove: unaligned dva: %lx\n", dva); + dva = trunc_page(dva); + } +#endif + + tte = letoh64(*tte_ptr); + +#ifdef DIAGNOSTIC + if ((tte & IOTTE_V) == 0) { + printf("Removing invalid tte entry (dva %lx &tte %p " + "tte %llx)\n", dva, tte_ptr, tte); + extent_print(sc->sc_dvmamap); + panic("IOMMU remove overwrite"); + } +#endif + + *tte_ptr = htole64(tte & ~IOTTE_V); + + /* Flush IOMMU. */ + r->tlb_pcom = htole32(dva | PAGE_SHIFT); +} |