Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 731 insertions, 0 deletions

diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
new file mode 100644
index 000000000000..d0f2bd227c4c
--- /dev/null
+++ b/arch/sparc/kernel/ioport.c
@@ -0,0 +1,731 @@
+/* $Id: ioport.c,v 1.45 2001/10/30 04:54:21 davem Exp $
+ * ioport.c:  Simple io mapping allocator.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ *
+ * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
+ *
+ * 2000/01/29
+ * <rth> zait: as long as pci_alloc_consistent produces something addressable, 
+ *      things are ok.
+ * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
+ *      pointer into the big page mapping
+ * <rth> zait: so what?
+ * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
+ * <zaitcev> Hmm
+ * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
+ *      So far so good.
+ * <zaitcev> Now, driver calls pci_free_consistent(with result of
+ *      remap_it_my_way()).
+ * <zaitcev> How do you find the address to pass to free_pages()?
+ * <rth> zait: walk the page tables?  It's only two or three level after all.
+ * <rth> zait: you have to walk them anyway to remove the mapping.
+ * <zaitcev> Hmm
+ * <zaitcev> Sounds reasonable
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/pci.h>          /* struct pci_dev */
+#include <linux/proc_fs.h>
+
+#include <asm/io.h>
+#include <asm/vaddrs.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/dma.h>
+
+#define mmu_inval_dma_area(p, l)        /* Anton pulled it out for 2.4.0-xx */
+
+struct resource *_sparc_find_resource(struct resource *r, unsigned long);
+
+static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
+static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
+    unsigned long size, char *name);
+static void _sparc_free_io(struct resource *res);
+
+/* This points to the next to use virtual memory for DVMA mappings */
+static struct resource _sparc_dvma = {
+        .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
+};
+/* This points to the start of I/O mappings, cluable from outside. */
+/*ext*/ struct resource sparc_iomap = {
+        .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
+};
+
+/*
+ * Our mini-allocator...
+ * Boy this is gross! We need it because we must map I/O for
+ * timers and interrupt controller before the kmalloc is available.
+ */
+
+#define XNMLN  15
+#define XNRES  10       /* SS-10 uses 8 */
+
+struct xresource {
+        struct resource xres;   /* Must be first */
+        int xflag;              /* 1 == used */
+        char xname[XNMLN+1];
+};
+
+static struct xresource xresv[XNRES];
+
+static struct xresource *xres_alloc(void) {
+        struct xresource *xrp;
+        int n;
+
+        xrp = xresv;
+        for (n = 0; n < XNRES; n++) {
+                if (xrp->xflag == 0) {
+                        xrp->xflag = 1;
+                        return xrp;
+                }
+                xrp++;
+        }
+        return NULL;
+}
+
+static void xres_free(struct xresource *xrp) {
+        xrp->xflag = 0;
+}
+
+/*
+ * These are typically used in PCI drivers
+ * which are trying to be cross-platform.
+ *
+ * Bus type is always zero on IIep.
+ */
+void __iomem *ioremap(unsigned long offset, unsigned long size)
+{
+        char name[14];
+
+        sprintf(name, "phys_%08x", (u32)offset);
+        return _sparc_alloc_io(0, offset, size, name);
+}
+
+/*
+ * Comlimentary to ioremap().
+ */
+void iounmap(volatile void __iomem *virtual)
+{
+        unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
+        struct resource *res;
+
+        if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) {
+                printk("free_io/iounmap: cannot free %lx\n", vaddr);
+                return;
+        }
+        _sparc_free_io(res);
+
+        if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
+                xres_free((struct xresource *)res);
+        } else {
+                kfree(res);
+        }
+}
+
+/*
+ */
+void __iomem *sbus_ioremap(struct resource *phyres, unsigned long offset,
+    unsigned long size, char *name)
+{
+        return _sparc_alloc_io(phyres->flags & 0xF,
+            phyres->start + offset, size, name);
+}
+
+/*
+ */
+void sbus_iounmap(volatile void __iomem *addr, unsigned long size)
+{
+        iounmap(addr);
+}
+
+/*
+ * Meat of mapping
+ */
+static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
+    unsigned long size, char *name)
+{
+        static int printed_full;
+        struct xresource *xres;
+        struct resource *res;
+        char *tack;
+        int tlen;
+        void __iomem *va;       /* P3 diag */
+
+        if (name == NULL) name = "???";
+
+        if ((xres = xres_alloc()) != 0) {
+                tack = xres->xname;
+                res = &xres->xres;
+        } else {
+                if (!printed_full) {
+                        printk("ioremap: done with statics, switching to malloc\n");
+                        printed_full = 1;
+                }
+                tlen = strlen(name);
+                tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
+                if (tack == NULL) return NULL;
+                memset(tack, 0, sizeof(struct resource));
+                res = (struct resource *) tack;
+                tack += sizeof (struct resource);
+        }
+
+        strlcpy(tack, name, XNMLN+1);
+        res->name = tack;
+
+        va = _sparc_ioremap(res, busno, phys, size);
+        /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
+        return va;
+}
+
+/*
+ */
+static void __iomem *
+_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
+{
+        unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
+
+        if (allocate_resource(&sparc_iomap, res,
+            (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
+            sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
+                /* Usually we cannot see printks in this case. */
+                prom_printf("alloc_io_res(%s): cannot occupy\n",
+                    (res->name != NULL)? res->name: "???");
+                prom_halt();
+        }
+
+        pa &= PAGE_MASK;
+        sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1);
+
+        return (void __iomem *) (res->start + offset);
+}
+
+/*
+ * Comlimentary to _sparc_ioremap().
+ */
+static void _sparc_free_io(struct resource *res)
+{
+        unsigned long plen;
+
+        plen = res->end - res->start + 1;
+        if ((plen & (PAGE_SIZE-1)) != 0) BUG();
+        sparc_unmapiorange(res->start, plen);
+        release_resource(res);
+}
+
+#ifdef CONFIG_SBUS
+
+void sbus_set_sbus64(struct sbus_dev *sdev, int x) {
+        printk("sbus_set_sbus64: unsupported\n");
+}
+
+/*
+ * Allocate a chunk of memory suitable for DMA.
+ * Typically devices use them for control blocks.
+ * CPU may access them without any explicit flushing.
+ *
+ * XXX Some clever people know that sdev is not used and supply NULL. Watch.
+ */
+void *sbus_alloc_consistent(struct sbus_dev *sdev, long len, u32 *dma_addrp)
+{
+        unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
+        unsigned long va;
+        struct resource *res;
+        int order;
+
+        /* XXX why are some lenghts signed, others unsigned? */
+        if (len <= 0) {
+                return NULL;
+        }
+        /* XXX So what is maxphys for us and how do drivers know it? */
+        if (len > 256*1024) {                   /* __get_free_pages() limit */
+                return NULL;
+        }
+
+        order = get_order(len_total);
+        if ((va = __get_free_pages(GFP_KERNEL, order)) == 0)
+                goto err_nopages;
+
+        if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
+                goto err_nomem;
+        memset((char*)res, 0, sizeof(struct resource));
+
+        if (allocate_resource(&_sparc_dvma, res, len_total,
+            _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
+                printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
+                goto err_nova;
+        }
+        mmu_inval_dma_area(va, len_total);
+        // XXX The mmu_map_dma_area does this for us below, see comments.
+        // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
+        /*
+         * XXX That's where sdev would be used. Currently we load
+         * all iommu tables with the same translations.
+         */
+        if (mmu_map_dma_area(dma_addrp, va, res->start, len_total) != 0)
+                goto err_noiommu;
+
+        return (void *)res->start;
+
+err_noiommu:
+        release_resource(res);
+err_nova:
+        free_pages(va, order);
+err_nomem:
+        kfree(res);
+err_nopages:
+        return NULL;
+}
+
+void sbus_free_consistent(struct sbus_dev *sdev, long n, void *p, u32 ba)
+{
+        struct resource *res;
+        struct page *pgv;
+
+        if ((res = _sparc_find_resource(&_sparc_dvma,
+            (unsigned long)p)) == NULL) {
+                printk("sbus_free_consistent: cannot free %p\n", p);
+                return;
+        }
+
+        if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
+                printk("sbus_free_consistent: unaligned va %p\n", p);
+                return;
+        }
+
+        n = (n + PAGE_SIZE-1) & PAGE_MASK;
+        if ((res->end-res->start)+1 != n) {
+                printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n",
+                    (long)((res->end-res->start)+1), n);
+                return;
+        }
+
+        release_resource(res);
+        kfree(res);
+
+        /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
+        pgv = mmu_translate_dvma(ba);
+        mmu_unmap_dma_area(ba, n);
+
+        __free_pages(pgv, get_order(n));
+}
+
+/*
+ * Map a chunk of memory so that devices can see it.
+ * CPU view of this memory may be inconsistent with
+ * a device view and explicit flushing is necessary.
+ */
+dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *va, size_t len, int direction)
+{
+        /* XXX why are some lenghts signed, others unsigned? */
+        if (len <= 0) {
+                return 0;
+        }
+        /* XXX So what is maxphys for us and how do drivers know it? */
+        if (len > 256*1024) {                   /* __get_free_pages() limit */
+                return 0;
+        }
+        return mmu_get_scsi_one(va, len, sdev->bus);
+}
+
+void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t ba, size_t n, int direction)
+{
+        mmu_release_scsi_one(ba, n, sdev->bus);
+}
+
+int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
+{
+        mmu_get_scsi_sgl(sg, n, sdev->bus);
+
+        /*
+         * XXX sparc64 can return a partial length here. sun4c should do this
+         * but it currently panics if it can't fulfill the request - Anton
+         */
+        return n;
+}
+
+void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
+{
+        mmu_release_scsi_sgl(sg, n, sdev->bus);
+}
+
+/*
+ */
+void sbus_dma_sync_single_for_cpu(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction)
+{
+#if 0
+        unsigned long va;
+        struct resource *res;
+
+        /* We do not need the resource, just print a message if invalid. */
+        res = _sparc_find_resource(&_sparc_dvma, ba);
+        if (res == NULL)
+                panic("sbus_dma_sync_single: 0x%x\n", ba);
+
+        va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */
+        /*
+         * XXX This bogosity will be fixed with the iommu rewrite coming soon
+         * to a kernel near you. - Anton
+         */
+        /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */
+#endif
+}
+
+void sbus_dma_sync_single_for_device(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction)
+{
+#if 0
+        unsigned long va;
+        struct resource *res;
+
+        /* We do not need the resource, just print a message if invalid. */
+        res = _sparc_find_resource(&_sparc_dvma, ba);
+        if (res == NULL)
+                panic("sbus_dma_sync_single: 0x%x\n", ba);
+
+        va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */
+        /*
+         * XXX This bogosity will be fixed with the iommu rewrite coming soon
+         * to a kernel near you. - Anton
+         */
+        /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */
+#endif
+}
+
+void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
+{
+        printk("sbus_dma_sync_sg_for_cpu: not implemented yet\n");
+}
+
+void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
+{
+        printk("sbus_dma_sync_sg_for_device: not implemented yet\n");
+}
+#endif /* CONFIG_SBUS */
+
+#ifdef CONFIG_PCI
+
+/* Allocate and map kernel buffer using consistent mode DMA for a device.
+ * hwdev should be valid struct pci_dev pointer for PCI devices.
+ */
+void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba)
+{
+        unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
+        unsigned long va;
+        struct resource *res;
+        int order;
+
+        if (len == 0) {
+                return NULL;
+        }
+        if (len > 256*1024) {                   /* __get_free_pages() limit */
+                return NULL;
+        }
+
+        order = get_order(len_total);
+        va = __get_free_pages(GFP_KERNEL, order);
+        if (va == 0) {
+                printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
+                return NULL;
+        }
+
+        if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
+                free_pages(va, order);
+                printk("pci_alloc_consistent: no core\n");
+                return NULL;
+        }
+        memset((char*)res, 0, sizeof(struct resource));
+
+        if (allocate_resource(&_sparc_dvma, res, len_total,
+            _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
+                printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
+                free_pages(va, order);
+                kfree(res);
+                return NULL;
+        }
+        mmu_inval_dma_area(va, len_total);
+#if 0
+/* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
+  (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
+#endif
+        sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
+
+        *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
+        return (void *) res->start;
+}
+
+/* Free and unmap a consistent DMA buffer.
+ * cpu_addr is what was returned from pci_alloc_consistent,
+ * size must be the same as what as passed into pci_alloc_consistent,
+ * and likewise dma_addr must be the same as what *dma_addrp was set to.
+ *
+ * References to the memory and mappings assosciated with cpu_addr/dma_addr
+ * past this call are illegal.
+ */
+void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba)
+{
+        struct resource *res;
+        unsigned long pgp;
+
+        if ((res = _sparc_find_resource(&_sparc_dvma,
+            (unsigned long)p)) == NULL) {
+                printk("pci_free_consistent: cannot free %p\n", p);
+                return;
+        }
+
+        if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
+                printk("pci_free_consistent: unaligned va %p\n", p);
+                return;
+        }
+
+        n = (n + PAGE_SIZE-1) & PAGE_MASK;
+        if ((res->end-res->start)+1 != n) {
+                printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
+                    (long)((res->end-res->start)+1), (long)n);
+                return;
+        }
+
+        pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */
+        mmu_inval_dma_area(pgp, n);
+        sparc_unmapiorange((unsigned long)p, n);
+
+        release_resource(res);
+        kfree(res);
+
+        free_pages(pgp, get_order(n));
+}
+
+/* Map a single buffer of the indicated size for DMA in streaming mode.
+ * The 32-bit bus address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory
+ * until either pci_unmap_single or pci_dma_sync_single_* is performed.
+ */
+dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
+    int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        /* IIep is write-through, not flushing. */
+        return virt_to_phys(ptr);
+}
+
+/* Unmap a single streaming mode DMA translation.  The dma_addr and size
+ * must match what was provided for in a previous pci_map_single call.  All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guaranteed to see
+ * whatever the device wrote there.
+ */
+void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
+    int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
+                    (size + PAGE_SIZE-1) & PAGE_MASK);
+        }
+}
+
+/*
+ * Same as pci_map_single, but with pages.
+ */
+dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
+                        unsigned long offset, size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        /* IIep is write-through, not flushing. */
+        return page_to_phys(page) + offset;
+}
+
+void pci_unmap_page(struct pci_dev *hwdev,
+                        dma_addr_t dma_address, size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        /* mmu_inval_dma_area XXX */
+}
+
+/* Map a set of buffers described by scatterlist in streaming
+ * mode for DMA.  This is the scather-gather version of the
+ * above pci_map_single interface.  Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+    int direction)
+{
+        int n;
+
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        /* IIep is write-through, not flushing. */
+        for (n = 0; n < nents; n++) {
+                if (page_address(sg->page) == NULL) BUG();
+                sg->dvma_address = virt_to_phys(page_address(sg->page));
+                sg->dvma_length = sg->length;
+                sg++;
+        }
+        return nents;
+}
+
+/* Unmap a set of streaming mode DMA translations.
+ * Again, cpu read rules concerning calls here are the same as for
+ * pci_unmap_single() above.
+ */
+void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+    int direction)
+{
+        int n;
+
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                for (n = 0; n < nents; n++) {
+                        if (page_address(sg->page) == NULL) BUG();
+                        mmu_inval_dma_area(
+                            (unsigned long) page_address(sg->page),
+                            (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+                        sg++;
+                }
+        }
+}
+
+/* Make physical memory consistent for a single
+ * streaming mode DMA translation before or after a transfer.
+ *
+ * If you perform a pci_map_single() but wish to interrogate the
+ * buffer using the cpu, yet do not wish to teardown the PCI dma
+ * mapping, you must call this function before doing so.  At the
+ * next point you give the PCI dma address back to the card, you
+ * must first perform a pci_dma_sync_for_device, and then the
+ * device again owns the buffer.
+ */
+void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
+                    (size + PAGE_SIZE-1) & PAGE_MASK);
+        }
+}
+
+void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
+                    (size + PAGE_SIZE-1) & PAGE_MASK);
+        }
+}
+
+/* Make physical memory consistent for a set of streaming
+ * mode DMA translations after a transfer.
+ *
+ * The same as pci_dma_sync_single_* but for a scatter-gather list,
+ * same rules and usage.
+ */
+void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+{
+        int n;
+
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                for (n = 0; n < nents; n++) {
+                        if (page_address(sg->page) == NULL) BUG();
+                        mmu_inval_dma_area(
+                            (unsigned long) page_address(sg->page),
+                            (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+                        sg++;
+                }
+        }
+}
+
+void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+{
+        int n;
+
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        if (direction != PCI_DMA_TODEVICE) {
+                for (n = 0; n < nents; n++) {
+                        if (page_address(sg->page) == NULL) BUG();
+                        mmu_inval_dma_area(
+                            (unsigned long) page_address(sg->page),
+                            (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+                        sg++;
+                }
+        }
+}
+#endif /* CONFIG_PCI */
+
+#ifdef CONFIG_PROC_FS
+
+static int
+_sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof,
+    void *data)
+{
+        char *p = buf, *e = buf + length;
+        struct resource *r;
+        const char *nm;
+
+        for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
+                if (p + 32 >= e)        /* Better than nothing */
+                        break;
+                if ((nm = r->name) == 0) nm = "???";
+                p += sprintf(p, "%08lx-%08lx: %s\n", r->start, r->end, nm);
+        }
+
+        return p-buf;
+}
+
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * This is a version of find_resource and it belongs to kernel/resource.c.
+ * Until we have agreement with Linus and Martin, it lingers here.
+ *
+ * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
+ * This probably warrants some sort of hashing.
+ */
+struct resource *
+_sparc_find_resource(struct resource *root, unsigned long hit)
+{
+        struct resource *tmp;
+
+        for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
+                if (tmp->start <= hit && tmp->end >= hit)
+                        return tmp;
+        }
+        return NULL;
+}
+
+void register_proc_sparc_ioport(void)
+{
+#ifdef CONFIG_PROC_FS
+        create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap);
+        create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma);
+#endif
+}