2150fb09b9
This fixes operation in QEMU and saves some booting time as well. Pointed out by: Sagar Karandikar <skarandikar@berkeley.edu> Sponsored by: DARPA, AFRL Sponsored by: HEIF5
284 lines
6.3 KiB
C
284 lines
6.3 KiB
C
/*-
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* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <machine/asm.h>
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#include <machine/trap.h>
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#include <machine/vmparam.h>
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#include "htif.h"
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static struct resource_spec htif_spec[] = {
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{ SYS_RES_IRQ, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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struct intr_entry {
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void (*func) (void *, uint64_t);
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void *arg;
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};
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struct intr_entry intrs[HTIF_NDEV];
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uint64_t
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htif_command(uint64_t arg)
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{
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return (machine_command(ECALL_HTIF_CMD, arg));
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}
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int
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htif_setup_intr(int id, void *func, void *arg)
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{
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if (id >= HTIF_NDEV)
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return (-1);
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intrs[id].func = func;
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intrs[id].arg = arg;
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return (0);
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}
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static void
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htif_handle_entry(struct htif_softc *sc)
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{
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uint64_t entry;
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uint8_t devcmd;
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uint8_t devid;
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entry = machine_command(ECALL_HTIF_GET_ENTRY, 0);
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while (entry) {
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devid = HTIF_DEV_ID(entry);
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devcmd = HTIF_DEV_CMD(entry);
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if (devcmd == HTIF_CMD_IDENTIFY) {
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/* Enumeration interrupt */
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if (devid == sc->identify_id)
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sc->identify_done = 1;
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} else {
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/* Device interrupt */
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if (intrs[devid].func != NULL)
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intrs[devid].func(intrs[devid].arg, entry);
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}
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entry = machine_command(ECALL_HTIF_GET_ENTRY, 0);
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}
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}
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static int
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htif_intr(void *arg)
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{
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struct htif_softc *sc;
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sc = arg;
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htif_handle_entry(sc);
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csr_clear(sip, SIE_SSIE);
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return (FILTER_HANDLED);
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}
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static int
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htif_add_device(struct htif_softc *sc, int i, char *id, char *name)
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{
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struct htif_dev_ivars *di;
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di = malloc(sizeof(struct htif_dev_ivars), M_DEVBUF, M_WAITOK | M_ZERO);
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di->sc = sc;
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di->index = i;
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di->id = malloc(HTIF_ID_LEN, M_DEVBUF, M_WAITOK | M_ZERO);
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memcpy(di->id, id, HTIF_ID_LEN);
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di->dev = device_add_child(sc->dev, name, -1);
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device_set_ivars(di->dev, di);
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return (0);
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}
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static int
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htif_enumerate(struct htif_softc *sc)
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{
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char id[HTIF_ID_LEN] __aligned(HTIF_ALIGN);
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uint64_t paddr;
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uint64_t data;
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uint64_t cmd;
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int len;
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int i;
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device_printf(sc->dev, "Enumerating devices\n");
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for (i = 0; i < HTIF_NDEV; i++) {
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paddr = pmap_kextract((vm_offset_t)&id);
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data = (paddr << IDENTIFY_PADDR_SHIFT);
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data |= IDENTIFY_IDENT;
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sc->identify_id = i;
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sc->identify_done = 0;
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cmd = i;
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cmd <<= HTIF_DEV_ID_SHIFT;
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cmd |= (HTIF_CMD_IDENTIFY << HTIF_CMD_SHIFT);
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cmd |= data;
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htif_command(cmd);
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/* Do poll as interrupts are disabled yet */
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while (sc->identify_done == 0) {
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htif_handle_entry(sc);
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}
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len = strnlen(id, sizeof(id));
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if (len <= 0)
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break;
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if (bootverbose)
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printf(" %d %s\n", i, id);
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if (strncmp(id, "disk", 4) == 0)
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htif_add_device(sc, i, id, "htif_blk");
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else if (strncmp(id, "bcd", 3) == 0)
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htif_add_device(sc, i, id, "htif_console");
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else if (strncmp(id, "syscall_proxy", 13) == 0)
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htif_add_device(sc, i, id, "htif_syscall_proxy");
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}
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return (bus_generic_attach(sc->dev));
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}
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int
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htif_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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struct htif_dev_ivars *ivars;
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ivars = device_get_ivars(child);
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switch (which) {
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case HTIF_IVAR_INDEX:
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*result = ivars->index;
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break;
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case HTIF_IVAR_ID:
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*result = (uintptr_t)ivars->id;
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default:
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return (EINVAL);
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}
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return (0);
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}
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static int
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htif_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "riscv,htif"))
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return (ENXIO);
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device_set_desc(dev, "HTIF bus device");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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htif_attach(device_t dev)
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{
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struct htif_softc *sc;
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int error;
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sc = device_get_softc(dev);
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sc->dev = dev;
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if (bus_alloc_resources(dev, htif_spec, sc->res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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/* Setup IRQs handler */
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error = bus_setup_intr(dev, sc->res[0], INTR_TYPE_CLK,
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htif_intr, NULL, sc, &sc->ihl[0]);
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if (error) {
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device_printf(dev, "Unable to alloc int resource.\n");
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return (ENXIO);
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}
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csr_set(sie, SIE_SSIE);
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return (htif_enumerate(sc));
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}
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static device_method_t htif_methods[] = {
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DEVMETHOD(device_probe, htif_probe),
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DEVMETHOD(device_attach, htif_attach),
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/* Bus interface */
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DEVMETHOD(bus_read_ivar, htif_read_ivar),
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DEVMETHOD_END
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};
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static driver_t htif_driver = {
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"htif",
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htif_methods,
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sizeof(struct htif_softc)
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};
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static devclass_t htif_devclass;
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DRIVER_MODULE(htif, simplebus, htif_driver,
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htif_devclass, 0, 0);
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