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-rw-r--r--chips/lance_mapped.c417
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diff --git a/chips/lance_mapped.c b/chips/lance_mapped.c
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+/*
+ * Mach Operating System
+ * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * File: if_se_mapped.c
+ * Author: Alessandro Forin, Carnegie Mellon University
+ * Date: 8/90
+ *
+ * In-kernel side of the user-mapped ethernet driver.
+ */
+
+#include <ln.h>
+#if NLN > 0
+#include <platforms.h>
+
+#include <mach/machine/vm_types.h>
+#include <machine/machspl.h> /* spl definitions */
+#include <chips/lance.h>
+#include <chips/busses.h>
+
+#include <device/device_types.h>
+#include <device/errno.h>
+#include <device/io_req.h>
+#include <device/net_status.h>
+#include <device/net_io.h>
+#include <device/if_hdr.h>
+#include <device/if_ether.h>
+
+#include <vm/vm_kern.h>
+#include <kern/eventcount.h>
+
+#include <machine/machspl.h>
+
+#ifdef DECSTATION
+
+#define machine_btop mips_btop
+
+#define kvctophys(v) K0SEG_TO_PHYS((v)) /* kernel virtual cached */
+#define phystokvc(p) PHYS_TO_K0SEG((p)) /* and back */
+#define kvutophys(v) K1SEG_TO_PHYS((v)) /* kernel virtual uncached */
+#define phystokvu(p) PHYS_TO_K1SEG((p)) /* and back */
+ /* remap from k2 to k0 */
+#define kvirt(v) ((phystokvc(pmap_extract(pmap_kernel(),v))))
+
+#include <mips/mips_cpu.h>
+/*
+ * Wired addresses and sizes
+ */
+#define SE0_REG_EMRG (se_reg_t)(0xb8000000)
+
+#define REGBASE(unit) (((u_int)SE_statii[unit].registers) - se_sw->regspace)
+
+#define SE_REG_PHYS(unit) kvutophys(REGBASE(unit)+se_sw->regspace)
+#define SE_REG_SIZE PAGE_SIZE
+
+#define SE_BUF_PHYS(unit) kvutophys(REGBASE(unit)+se_sw->bufspace)
+#define SE_BUF_SIZE (128*1024)
+
+#define SE_ADR_PHYS(unit) kvutophys(REGBASE(unit)+se_sw->romspace)
+#define SE_ADR_SIZE PAGE_SIZE
+#endif /*DECSTATION*/
+
+#ifdef VAXSTATION
+#define machine_btop vax_btop
+#endif /*VAXSTATION*/
+
+#ifdef LUNA88K
+# define machine_btop m88k_btop
+# define kvirt(v) (v)
+# define kvctophys(v) pmap_extract(pmap_kernel(),(v))
+# define SE0_REG_EMRG ((se_reg_t)0xF1000000U)
+# define REGBASE(unit) (((u_int)SE_statii[unit].registers) - se_sw->regspace)
+# define SE_REG_PHYS(unit) (REGBASE(unit) + se_sw->regspace)
+# define SE_REG_SIZE PAGE_SIZE
+# define SE_BUF_PHYS(unit) (REGBASE(unit) + se_sw->bufspace)
+# define SE_BUF_SIZE (64*1024)
+# define SE_ADR_PHYS(unit) kvctophys(REGBASE(unit) + se_sw->romspace)
+# define SE_ADR_SIZE PAGE_SIZE
+# define wbflush() /*empty*/
+#endif /*LUNA88K*/
+
+/*
+ * Autoconf info
+ */
+
+static vm_offset_t SEstd[NLN] = { 0 };
+static struct bus_device *SEinfo[NLN];
+ void SE_attach();
+ int SE_probe();
+
+struct bus_driver SEdriver =
+ { SE_probe, 0, SE_attach, 0, SEstd, "SE", SEinfo, };
+
+/*
+ * Externally visible functions
+ */
+int SE_probe(); /* Kernel */
+void SE_intr(), SE_portdeath();
+ /* User */
+int SE_open(), SE_close();
+vm_offset_t SE_mmap();
+
+
+/* forward declarations */
+
+static void SE_stop(unsigned int unit);
+
+/*
+ * Status information for all interfaces
+ */
+/*static*/ struct SE_status {
+ se_reg_t registers;
+ mapped_ether_info_t info;
+ struct evc eventcounter;
+} SE_statii[NLN];
+
+
+/*
+ * Probe the Lance to see (if) that it's there
+ */
+int
+SE_probe(regbase, ui)
+ vm_offset_t regbase;
+ register struct bus_device *ui;
+{
+ int unit = ui->unit;
+ se_reg_t regs;
+ vm_offset_t addr;
+ mapped_ether_info_t info;
+ struct SE_status *self;
+
+
+ if (unit >= NLN)
+ return 0;
+
+ self = &SE_statii[unit];
+
+ printf("[mappable] ");
+
+ regs = (se_reg_t) (regbase + se_sw->regspace);
+ self->registers = regs;
+
+ /*
+ * Reset the interface
+ */
+ SE_stop(unit);
+
+ /*
+ * Grab a page to be mapped later to users
+ */
+ (void) kmem_alloc_wired(kernel_map, &addr, PAGE_SIZE);
+ /*
+ on the decstation, kmem_alloc_wired returns virtual addresses
+ in the k2 seg. Since this page is going to get mapped in
+ user space, we need to transform it to a better understood
+ virtual address. The kvirt function does this.
+ */
+ bzero(addr, PAGE_SIZE);
+ info = (mapped_ether_info_t) kvirt(addr);
+ self->info = info;
+
+ /*
+ * Set permanent info
+ */
+ info->rom_stride = se_sw->romstride;
+ info->ram_stride = se_sw->ramstride;
+ info->buffer_size = se_sw->ramsize;
+ info->buffer_physaddr = se_sw->ln_bufspace;
+
+ /*
+ * Synch setup
+ */
+ evc_init(&self->eventcounter);
+ info->wait_event = self->eventcounter.ev_id;
+
+ return 1;
+}
+
+void
+SE_attach(ui)
+ register struct bus_device *ui;
+{
+}
+
+
+/*
+ * Shut off the lance
+ */
+static void SE_stop(unsigned int unit)
+{
+ register se_reg_t regs = SE_statii[unit].registers;
+
+ if (regs == 0)
+ /* Stray interrupt */
+ regs = SE0_REG_EMRG;
+
+ regs[2] = CSR0_SELECT; /* XXXX rap XXXX */
+ wbflush();
+ regs[0] = LN_CSR0_STOP;
+ wbflush();
+}
+
+
+/*
+ * Ethernet interface interrupt routine
+ */
+void SE_intr(unit,spllevel)
+ int unit;
+ spl_t spllevel;
+{
+ register struct SE_status *self = &SE_statii[unit];
+ register se_reg_t regs = self->registers;
+ register csr;
+
+ if (regs == 0) { /* stray */
+ SE_stop(unit);
+ return;
+ }
+
+ /* Acknowledge interrupt request, drop spurious intr */
+ csr = regs[0];
+ if ((csr & LN_CSR0_INTR) == 0)
+ return;
+ regs[0] = csr & LN_CSR0_WTC; /* silence it */
+
+ splx(spllevel); /* drop priority now */
+
+ /* Pass csr state up to user thread */
+ if (self->info) {
+ self->info->interrupt_count++; /* total interrupts */
+ self->info->saved_csr0 = csr;
+ }
+
+ /* Awake user thread */
+ evc_signal(&self->eventcounter);
+}
+
+
+extern boolean_t se_use_mapped_interface[NLN];
+
+/*
+ * Device open procedure
+ */
+int SE_open(dev, flag, ior)
+ io_req_t ior;
+{
+ int unit = dev;
+ register struct SE_status *self = &SE_statii[unit];
+
+ if (unit >= NLN)
+ return EINVAL;
+
+ /*
+ * Silence interface, just in case
+ */
+ SE_stop(unit);
+
+ /*
+ * Reset eventcounter
+ */
+ evc_signal(&self->eventcounter);
+
+ se_use_mapped_interface[unit] = 1;
+
+ /*
+ * Do not turn Ether interrupts on. The user can do it when ready
+ * to take them.
+ */
+
+ return 0;
+}
+
+/*
+ * Device close procedure
+ */
+int SE_close(dev, flag)
+{
+ int unit = dev;
+ register struct SE_status *self = &SE_statii[unit];
+
+ if (unit >= NLN)
+ return EINVAL;
+
+ /*
+ * Silence interface, in case user forgot
+ */
+ SE_stop(unit);
+ evc_signal(&self->eventcounter);
+
+ se_normal(unit);
+
+ return 0;
+}
+
+
+/*
+ * Get status procedure.
+ * We need to tell that we are mappable.
+ */
+io_return_t
+SE_get_status(ifp, flavor, status, status_count)
+/* struct ifnet *ifp; not really..*/
+ int flavor;
+ dev_status_t status; /* pointer to OUT array */
+ unsigned int *status_count; /* OUT */
+{
+ switch (flavor) {
+ case NET_STATUS:
+ {
+ register struct net_status *ns = (struct net_status *)status;
+
+ ns->min_packet_size = sizeof(struct ether_header);
+ ns->max_packet_size = sizeof(struct ether_header) + ETHERMTU;
+ ns->header_format = HDR_ETHERNET;
+ ns->header_size = sizeof(struct ether_header);
+ ns->address_size = 6;
+ ns->flags = IFF_BROADCAST;
+ ns->mapped_size = SE_BUF_SIZE + (3 * PAGE_SIZE);
+
+ *status_count = NET_STATUS_COUNT;
+ break;
+ }
+/* case NET_ADDRESS: find it yourself */
+ default:
+ return (D_INVALID_OPERATION);
+ }
+ return (D_SUCCESS);
+}
+
+/*
+ * Should not refuse this either
+ */
+int SE_set_status(dev, flavor, status, status_count)
+ int dev;
+ int flavor;
+ dev_status_t status;
+ unsigned int status_count;
+{
+ return (D_SUCCESS);
+}
+
+/*
+ * Port death notification routine
+ */
+void SE_portdeath(dev, dead_port)
+{
+}
+
+
+/*
+ * Virtual->physical mapping routine.
+ */
+vm_offset_t
+SE_mmap(dev, off, prot)
+ int dev;
+ vm_offset_t off;
+ vm_prot_t prot;
+{
+ vm_offset_t page;
+ vm_offset_t addr;
+ int unit = dev;
+
+ /*
+ * The offset (into the VM object) defines the following layout
+ *
+ * off size what
+ * 0 1pg mapping information (csr & #interrupts)
+ * 1pg 1pg lance registers
+ * 2pg 1pg lance station address (ROM)
+ * 3pg 128k lance buffers
+ */
+#define S0 PAGE_SIZE
+#define S1 (S0+SE_REG_SIZE)
+#define S2 (S1+SE_ADR_SIZE)
+#define S3 (S2+SE_BUF_SIZE)
+
+ if (off < S0) {
+ addr = kvctophys (SE_statii[unit].info);
+ } else if (off < S1) {
+ addr = (vm_offset_t) SE_REG_PHYS(unit);
+ off -= S0;
+ } else if (off < S2) {
+ addr = (vm_offset_t) SE_ADR_PHYS(unit);
+ off -= S1;
+ } else if (off < S3) {
+ addr = (vm_offset_t) SE_BUF_PHYS(unit);
+ off -= S2;
+ } else
+ return (EINVAL);
+
+ page = machine_btop(addr + off);
+ return (page);
+}
+
+#endif NLN > 0
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