Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 425 insertions, 0 deletions

diff --git a/arch/m68k/sun3/mmu_emu.c b/arch/m68k/sun3/mmu_emu.c
new file mode 100644
index 000000000..7321b3b76
--- /dev/null
+++ b/arch/m68k/sun3/mmu_emu.c
@@ -0,0 +1,425 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+** Tablewalk MMU emulator
+**
+** by Toshiyasu Morita
+**
+** Started 1/16/98 @ 2:22 am
+*/
+
+#include <linux/init.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/delay.h>
+#include <linux/memblock.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/sched/mm.h>
+
+#include <asm/setup.h>
+#include <asm/traps.h>
+#include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/sun3mmu.h>
+#include <asm/oplib.h>
+#include <asm/mmu_context.h>
+#include <asm/dvma.h>
+
+
+#undef DEBUG_MMU_EMU
+#define DEBUG_PROM_MAPS
+
+/*
+** Defines
+*/
+
+#define CONTEXTS_NUM		8
+#define SEGMAPS_PER_CONTEXT_NUM 2048
+#define PAGES_PER_SEGMENT	16
+#define PMEGS_NUM		256
+#define PMEG_MASK		0xFF
+
+/*
+** Globals
+*/
+
+unsigned long m68k_vmalloc_end;
+EXPORT_SYMBOL(m68k_vmalloc_end);
+
+unsigned long pmeg_vaddr[PMEGS_NUM];
+unsigned char pmeg_alloc[PMEGS_NUM];
+unsigned char pmeg_ctx[PMEGS_NUM];
+
+/* pointers to the mm structs for each task in each
+   context. 0xffffffff is a marker for kernel context */
+static struct mm_struct *ctx_alloc[CONTEXTS_NUM] = {
+    [0] = (struct mm_struct *)0xffffffff
+};
+
+/* has this context been mmdrop'd? */
+static unsigned char ctx_avail = CONTEXTS_NUM-1;
+
+/* array of pages to be marked off for the rom when we do mem_init later */
+/* 256 pages lets the rom take up to 2mb of physical ram..  I really
+   hope it never wants mote than that. */
+unsigned long rom_pages[256];
+
+/* Print a PTE value in symbolic form. For debugging. */
+void print_pte (pte_t pte)
+{
+#if 0
+	/* Verbose version. */
+	unsigned long val = pte_val (pte);
+	pr_cont(" pte=%lx [addr=%lx",
+		val, (val & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT);
+	if (val & SUN3_PAGE_VALID)	pr_cont(" valid");
+	if (val & SUN3_PAGE_WRITEABLE)	pr_cont(" write");
+	if (val & SUN3_PAGE_SYSTEM)	pr_cont(" sys");
+	if (val & SUN3_PAGE_NOCACHE)	pr_cont(" nocache");
+	if (val & SUN3_PAGE_ACCESSED)	pr_cont(" accessed");
+	if (val & SUN3_PAGE_MODIFIED)	pr_cont(" modified");
+	switch (val & SUN3_PAGE_TYPE_MASK) {
+		case SUN3_PAGE_TYPE_MEMORY: pr_cont(" memory"); break;
+		case SUN3_PAGE_TYPE_IO:     pr_cont(" io");     break;
+		case SUN3_PAGE_TYPE_VME16:  pr_cont(" vme16");  break;
+		case SUN3_PAGE_TYPE_VME32:  pr_cont(" vme32");  break;
+	}
+	pr_cont("]\n");
+#else
+	/* Terse version. More likely to fit on a line. */
+	unsigned long val = pte_val (pte);
+	char flags[7], *type;
+
+	flags[0] = (val & SUN3_PAGE_VALID)     ? 'v' : '-';
+	flags[1] = (val & SUN3_PAGE_WRITEABLE) ? 'w' : '-';
+	flags[2] = (val & SUN3_PAGE_SYSTEM)    ? 's' : '-';
+	flags[3] = (val & SUN3_PAGE_NOCACHE)   ? 'x' : '-';
+	flags[4] = (val & SUN3_PAGE_ACCESSED)  ? 'a' : '-';
+	flags[5] = (val & SUN3_PAGE_MODIFIED)  ? 'm' : '-';
+	flags[6] = '\0';
+
+	switch (val & SUN3_PAGE_TYPE_MASK) {
+		case SUN3_PAGE_TYPE_MEMORY: type = "memory"; break;
+		case SUN3_PAGE_TYPE_IO:     type = "io"    ; break;
+		case SUN3_PAGE_TYPE_VME16:  type = "vme16" ; break;
+		case SUN3_PAGE_TYPE_VME32:  type = "vme32" ; break;
+		default: type = "unknown?"; break;
+	}
+
+	pr_cont(" pte=%08lx [%07lx %s %s]\n",
+		val, (val & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT, flags, type);
+#endif
+}
+
+/* Print the PTE value for a given virtual address. For debugging. */
+void print_pte_vaddr (unsigned long vaddr)
+{
+	pr_cont(" vaddr=%lx [%02lx]", vaddr, sun3_get_segmap (vaddr));
+	print_pte (__pte (sun3_get_pte (vaddr)));
+}
+
+/*
+ * Initialise the MMU emulator.
+ */
+void __init mmu_emu_init(unsigned long bootmem_end)
+{
+	unsigned long seg, num;
+	int i,j;
+
+	memset(rom_pages, 0, sizeof(rom_pages));
+	memset(pmeg_vaddr, 0, sizeof(pmeg_vaddr));
+	memset(pmeg_alloc, 0, sizeof(pmeg_alloc));
+	memset(pmeg_ctx, 0, sizeof(pmeg_ctx));
+
+	/* pmeg align the end of bootmem, adding another pmeg,
+	 * later bootmem allocations will likely need it */
+	bootmem_end = (bootmem_end + (2 * SUN3_PMEG_SIZE)) & ~SUN3_PMEG_MASK;
+
+	/* mark all of the pmegs used thus far as reserved */
+	for (i=0; i < __pa(bootmem_end) / SUN3_PMEG_SIZE ; ++i)
+		pmeg_alloc[i] = 2;
+
+
+	/* I'm thinking that most of the top pmeg's are going to be
+	   used for something, and we probably shouldn't risk it */
+	for(num = 0xf0; num <= 0xff; num++)
+		pmeg_alloc[num] = 2;
+
+	/* liberate all existing mappings in the rest of kernel space */
+	for(seg = bootmem_end; seg < 0x0f800000; seg += SUN3_PMEG_SIZE) {
+		i = sun3_get_segmap(seg);
+
+		if(!pmeg_alloc[i]) {
+#ifdef DEBUG_MMU_EMU
+			pr_info("freed:");
+			print_pte_vaddr (seg);
+#endif
+			sun3_put_segmap(seg, SUN3_INVALID_PMEG);
+		}
+	}
+
+	j = 0;
+	for (num=0, seg=0x0F800000; seg<0x10000000; seg+=16*PAGE_SIZE) {
+		if (sun3_get_segmap (seg) != SUN3_INVALID_PMEG) {
+#ifdef DEBUG_PROM_MAPS
+			for(i = 0; i < 16; i++) {
+				pr_info("mapped:");
+				print_pte_vaddr (seg + (i*PAGE_SIZE));
+				break;
+			}
+#endif
+			// the lowest mapping here is the end of our
+			// vmalloc region
+			if (!m68k_vmalloc_end)
+				m68k_vmalloc_end = seg;
+
+			// mark the segmap alloc'd, and reserve any
+			// of the first 0xbff pages the hardware is
+			// already using...  does any sun3 support > 24mb?
+			pmeg_alloc[sun3_get_segmap(seg)] = 2;
+		}
+	}
+
+	dvma_init();
+
+
+	/* blank everything below the kernel, and we've got the base
+	   mapping to start all the contexts off with... */
+	for(seg = 0; seg < PAGE_OFFSET; seg += SUN3_PMEG_SIZE)
+		sun3_put_segmap(seg, SUN3_INVALID_PMEG);
+
+	set_fc(3);
+	for(seg = 0; seg < 0x10000000; seg += SUN3_PMEG_SIZE) {
+		i = sun3_get_segmap(seg);
+		for(j = 1; j < CONTEXTS_NUM; j++)
+			(*(romvec->pv_setctxt))(j, (void *)seg, i);
+	}
+	set_fc(USER_DATA);
+}
+
+/* erase the mappings for a dead context.  Uses the pg_dir for hints
+   as the pmeg tables proved somewhat unreliable, and unmapping all of
+   TASK_SIZE was much slower and no more stable. */
+/* todo: find a better way to keep track of the pmegs used by a
+   context for when they're cleared */
+void clear_context(unsigned long context)
+{
+     unsigned char oldctx;
+     unsigned long i;
+
+     if(context) {
+	     if(!ctx_alloc[context])
+		     panic("%s: context not allocated\n", __func__);
+
+	     ctx_alloc[context]->context = SUN3_INVALID_CONTEXT;
+	     ctx_alloc[context] = (struct mm_struct *)0;
+	     ctx_avail++;
+     }
+
+     oldctx = sun3_get_context();
+
+     sun3_put_context(context);
+
+     for(i = 0; i < SUN3_INVALID_PMEG; i++) {
+	     if((pmeg_ctx[i] == context) && (pmeg_alloc[i] == 1)) {
+		     sun3_put_segmap(pmeg_vaddr[i], SUN3_INVALID_PMEG);
+		     pmeg_ctx[i] = 0;
+		     pmeg_alloc[i] = 0;
+		     pmeg_vaddr[i] = 0;
+	     }
+     }
+
+     sun3_put_context(oldctx);
+}
+
+/* gets an empty context.  if full, kills the next context listed to
+   die first */
+/* This context invalidation scheme is, well, totally arbitrary, I'm
+   sure it could be much more intelligent...  but it gets the job done
+   for now without much overhead in making it's decision. */
+/* todo: come up with optimized scheme for flushing contexts */
+unsigned long get_free_context(struct mm_struct *mm)
+{
+	unsigned long new = 1;
+	static unsigned char next_to_die = 1;
+
+	if(!ctx_avail) {
+		/* kill someone to get our context */
+		new = next_to_die;
+		clear_context(new);
+		next_to_die = (next_to_die + 1) & 0x7;
+		if(!next_to_die)
+			next_to_die++;
+	} else {
+		while(new < CONTEXTS_NUM) {
+			if(ctx_alloc[new])
+				new++;
+			else
+				break;
+		}
+		// check to make sure one was really free...
+		if(new == CONTEXTS_NUM)
+			panic("%s: failed to find free context", __func__);
+	}
+
+	ctx_alloc[new] = mm;
+	ctx_avail--;
+
+	return new;
+}
+
+/*
+ * Dynamically select a `spare' PMEG and use it to map virtual `vaddr' in
+ * `context'. Maintain internal PMEG management structures. This doesn't
+ * actually map the physical address, but does clear the old mappings.
+ */
+//todo: better allocation scheme? but is extra complexity worthwhile?
+//todo: only clear old entries if necessary? how to tell?
+
+inline void mmu_emu_map_pmeg (int context, int vaddr)
+{
+	static unsigned char curr_pmeg = 128;
+	int i;
+
+	/* Round address to PMEG boundary. */
+	vaddr &= ~SUN3_PMEG_MASK;
+
+	/* Find a spare one. */
+	while (pmeg_alloc[curr_pmeg] == 2)
+		++curr_pmeg;
+
+
+#ifdef DEBUG_MMU_EMU
+	pr_info("mmu_emu_map_pmeg: pmeg %x to context %d vaddr %x\n",
+		curr_pmeg, context, vaddr);
+#endif
+
+	/* Invalidate old mapping for the pmeg, if any */
+	if (pmeg_alloc[curr_pmeg] == 1) {
+		sun3_put_context(pmeg_ctx[curr_pmeg]);
+		sun3_put_segmap (pmeg_vaddr[curr_pmeg], SUN3_INVALID_PMEG);
+		sun3_put_context(context);
+	}
+
+	/* Update PMEG management structures. */
+	// don't take pmeg's away from the kernel...
+	if(vaddr >= PAGE_OFFSET) {
+		/* map kernel pmegs into all contexts */
+		unsigned char i;
+
+		for(i = 0; i < CONTEXTS_NUM; i++) {
+			sun3_put_context(i);
+			sun3_put_segmap (vaddr, curr_pmeg);
+		}
+		sun3_put_context(context);
+		pmeg_alloc[curr_pmeg] = 2;
+		pmeg_ctx[curr_pmeg] = 0;
+
+	}
+	else {
+		pmeg_alloc[curr_pmeg] = 1;
+		pmeg_ctx[curr_pmeg] = context;
+		sun3_put_segmap (vaddr, curr_pmeg);
+
+	}
+	pmeg_vaddr[curr_pmeg] = vaddr;
+
+	/* Set hardware mapping and clear the old PTE entries. */
+	for (i=0; i<SUN3_PMEG_SIZE; i+=SUN3_PTE_SIZE)
+		sun3_put_pte (vaddr + i, SUN3_PAGE_SYSTEM);
+
+	/* Consider a different one next time. */
+	++curr_pmeg;
+}
+
+/*
+ * Handle a pagefault at virtual address `vaddr'; check if there should be a
+ * page there (specifically, whether the software pagetables indicate that
+ * there is). This is necessary due to the limited size of the second-level
+ * Sun3 hardware pagetables (256 groups of 16 pages). If there should be a
+ * mapping present, we select a `spare' PMEG and use it to create a mapping.
+ * `read_flag' is nonzero for a read fault; zero for a write. Returns nonzero
+ * if we successfully handled the fault.
+ */
+//todo: should we bump minor pagefault counter? if so, here or in caller?
+//todo: possibly inline this into bus_error030 in <asm/buserror.h> ?
+
+// kernel_fault is set when a kernel page couldn't be demand mapped,
+// and forces another try using the kernel page table.  basically a
+// hack so that vmalloc would work correctly.
+
+int mmu_emu_handle_fault (unsigned long vaddr, int read_flag, int kernel_fault)
+{
+	unsigned long segment, offset;
+	unsigned char context;
+	pte_t *pte;
+	pgd_t * crp;
+
+	if(current->mm == NULL) {
+		crp = swapper_pg_dir;
+		context = 0;
+	} else {
+		context = current->mm->context;
+		if(kernel_fault)
+			crp = swapper_pg_dir;
+		else
+			crp = current->mm->pgd;
+	}
+
+#ifdef DEBUG_MMU_EMU
+	pr_info("%s: vaddr=%lx type=%s crp=%p\n", __func__, vaddr,
+		read_flag ? "read" : "write", crp);
+#endif
+
+	segment = (vaddr >> SUN3_PMEG_SIZE_BITS) & 0x7FF;
+	offset  = (vaddr >> SUN3_PTE_SIZE_BITS) & 0xF;
+
+#ifdef DEBUG_MMU_EMU
+	pr_info("%s: segment=%lx offset=%lx\n", __func__, segment, offset);
+#endif
+
+	pte = (pte_t *) pgd_val (*(crp + segment));
+
+//todo: next line should check for valid pmd properly.
+	if (!pte) {
+//                pr_info("mmu_emu_handle_fault: invalid pmd\n");
+                return 0;
+        }
+
+	pte = (pte_t *) __va ((unsigned long)(pte + offset));
+
+	/* Make sure this is a valid page */
+	if (!(pte_val (*pte) & SUN3_PAGE_VALID))
+		return 0;
+
+	/* Make sure there's a pmeg allocated for the page */
+	if (sun3_get_segmap (vaddr&~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
+		mmu_emu_map_pmeg (context, vaddr);
+
+	/* Write the pte value to hardware MMU */
+	sun3_put_pte (vaddr&PAGE_MASK, pte_val (*pte));
+
+	/* Update software copy of the pte value */
+// I'm not sure this is necessary. If this is required, we ought to simply
+// copy this out when we reuse the PMEG or at some other convenient time.
+// Doing it here is fairly meaningless, anyway, as we only know about the
+// first access to a given page. --m
+	if (!read_flag) {
+		if (pte_val (*pte) & SUN3_PAGE_WRITEABLE)
+			pte_val (*pte) |= (SUN3_PAGE_ACCESSED
+					   | SUN3_PAGE_MODIFIED);
+		else
+			return 0;	/* Write-protect error. */
+	} else
+		pte_val (*pte) |= SUN3_PAGE_ACCESSED;
+
+#ifdef DEBUG_MMU_EMU
+	pr_info("seg:%ld crp:%p ->", get_fs().seg, crp);
+	print_pte_vaddr (vaddr);
+	pr_cont("\n");
+#endif
+
+	return 1;
+}