Add support for the QEMU MIPS "mipssim" simulator.
TODO- mipsnet network driver (root on md(4) only for now).


(simonb)

# $NetBSD: MIPSSIM,v 1.1 2021/01/27 05:24:16 simonb Exp $
#
# Kernel config for the QEMU MIPS "mipssim" simulator

include 	"arch/evbmips/conf/std.mipssim"

#ident 		"GENERIC-$Revision: 1.1 $"

maxusers	32

options 	MIPS32
options 	MIPS32R2
options 	NOFPU		# No FPU
options 	FPEMUL		# emulate FPU insn
options 	HZ=512		# for profiling

#options 	LOCKDEBUG
options 	SOSEND_COUNTERS
options 	INET_CSUM_COUNTERS
options 	TCP_CSUM_COUNTERS
options 	UDP_CSUM_COUNTERS
options 	TCP_OUTPUT_COUNTERS

#options 	NTP		# network time protocol

# Debugging options
options 	DIAGNOSTIC	# extra kernel sanity checking
options 	DEBUG		# extra kernel debugging support
options 	DDB		# kernel dynamic debugger
options 	DDB_HISTORY_SIZE=100 # enable history editing in DDB
makeoptions 	DEBUG="-g"	# compile full symbol table
makeoptions	COPY_SYMTAB=1	# size for embedded symbol table

pseudo-device	md				# memory disk device
options 	MEMORY_DISK_HOOKS
options 	MEMORY_DISK_IS_ROOT		# Force root on ram-disk
options 	MEMORY_DISK_ROOT_SIZE=32768	# size of memory disk, in blocks

# Compatibility options
include         "conf/compat_netbsd50.config"
#options 	EXEC_ECOFF	# exec ECOFF binaries
#options 	COMPAT_ULTRIX	# binary compatibility with Ultrix

# File systems
file-system	FFS		# Berkeley Fast Filesystem
#file-system	MFS		# memory-based filesystem
#file-system 	EXT2FS		# second extended file system (linux)
file-system	NFS		# Sun NFS-compatible filesystem client
#file-system	KERNFS		# kernel data-structure filesystem
#file-system	NULLFS		# NULL layered filesystem
#file-system 	OVERLAY		# overlay file system
#file-system	FDESC		# user file descriptor filesystem
#file-system	UMAPFS		# uid/gid remapping filesystem
#file-system	LFS		# Log-based filesystem (still experimental)
#file-system	PROCFS		# /proc
#file-system	CD9660		# ISO 9660 + Rock Ridge file system
#file-system	UNION		# union file system
#file-system	MSDOSFS		# MS-DOS FAT filesystem(s).
#file-system 	CODA		# Coda File System; also needs vcoda (below)
file-system	PTYFS		# /dev/pts/N support

# File system options
#options 	NFSSERVER	# Sun NFS-compatible filesystem server
#options 	QUOTA		# legacy UFS quotas
#options 	QUOTA2		# new, in-filesystem UFS quotas
#options 	DISKLABEL_EI	# disklabel Endian Independent support
#options 	FFS_EI		# FFS Endian Independent support
#options 	WAPBL		# File system journaling support
#options 	EXT2FS_SYSTEM_FLAGS # makes ext2fs file flags (append and
				# immutable) behave as system flags.

# Alternate buffer queue strategies for better responsiveness under high
# disk I/O load.
#options 	BUFQ_READPRIO
#options 	BUFQ_PRIOCSCAN

# Networking options
#options 	GATEWAY		# IP packet forwarding
options 	INET		# Internet protocols
#options 	INET6		# IPV6
#options 	IPSEC		# IP security
#options 	IPSEC_DEBUG	# debug for IP security
#options 	MROUTING	# packet forwarding of multicast packets
#options 	NETATALK	# AppleTalk (over Ethernet) protocol
#options 	PIM		# Protocol Independent Multicast
#options 	PPP_BSDCOMP	# BSD-Compress compression support for PPP
#options 	PPP_DEFLATE	# Deflate compression support for PPP
#options 	PPP_FILTER	# Active filter support for PPP (requires bpf)

# JIT compiler for bpfilter
#options	SLJIT
#options	BPFJIT

# These options enable verbose messages for several subsystems.
# Warning, these may compile large string tables into the kernel!
#options 	MIIVERBOSE	# verbose PHY autoconfig messages

options 	NFS_BOOT_DHCP

config		netbsd		root on ? type ?

mainbus0 	at root
cpu* 		at mainbus?
com*		at mainbus?
# mipsnet*	at mainbus?
# options 	MIPSSIM_ETH_MACADDR="ba:bb:1e:01:23:45"

# Network pseudo-devices
pseudo-device	bpfilter			# Berkeley packet filter
#pseudo-device 	carp				# Common Address Redundancy Protocol
pseudo-device	loop				# network loopback
#pseudo-device	ppp				# Point-to-Point Protocol
#pseudo-device	sl				# Serial Line IP
#pseudo-device	tun				# network tunneling over tty
#pseudo-device	gre				# generic L3 over IP tunnel
#pseudo-device	ipip				# RFC 2003 IP Encapsulation
#pseudo-device	gif				# RFC1933 tunnel
#pseudo-device	faith				# IPv[46] tcp relay translation
# Miscellaneous pseudo-devices
pseudo-device	pty				# pseudo-terminals
#pseudo-device	sequencer			# MIDI sequencer

# A pseudo device needed for Coda		# also needs CODA (above)
#pseudo-device	vcoda				# coda minicache <-> venus comm.
pseudo-device	clockctl			# user control of clock subsystem
pseudo-device	ksyms				# /dev/ksyms

include "dev/veriexec.config"

# $NetBSD: MIPSSIM64,v 1.1 2021/01/27 05:24:16 simonb Exp $
#
include "arch/evbmips/conf/MIPSSIM"

makeoptions	LP64="yes"

no options 	MIPS32
no options 	MIPS32R2

options 	MIPS64
options 	MIPS64R2
options 	EXEC_ELF64
options 	COMPAT_NETBSD32

# $NetBSD: files.mipssim,v 1.1 2021/01/27 05:24:16 simonb Exp $

file	arch/evbmips/mipssim/autoconf.c
file	arch/evbmips/mipssim/machdep.c
file	arch/evbmips/mipssim/mipssim_intr.c
file	arch/evbmips/mipssim/mipssim_bus_io.c

file	arch/evbmips/evbmips/interrupt.c

file	arch/mips/mips/mips3_clock.c
file	arch/mips/mips/mips3_clockintr.c

# System bus
device	mainbus {}
attach	mainbus at root
file	arch/evbmips/mipssim/mainbus.c		mainbus

device	cpu
attach	cpu at mainbus
file	arch/evbmips/evbmips/cpu.c		cpu

attach	com at mainbus with com_mainbus
file	arch/evbmips/mipssim/com_mainbus.c	com_mainbus

device	mipsnet: ether, ifnet, arp, mii
attach	mipsnet at mainbus
file	arch/evbmips/mipssim/if_mipsnet.c	mipsnet
defparam opt_mipsnet.h				MIPSSIM_ETH_MACADDR

# Memory Disk
file	dev/md_root.c				memory_disk_hooks

# $NetBSD: std.mipssim,v 1.1 2021/01/27 05:24:16 simonb Exp $

machine	evbmips mips
include	"conf/std"	# MI standard options

options MIPS3_ENABLE_CLOCK_INTR
options	EVBMIPS_CLOCKSUBR

options	EXEC_ELF32	# exec ELF32 binaries
options	EXEC_SCRIPT	# exec #! scripts

makeoptions	DEFTEXTADDR="0x80010000"
makeoptions	BOARDTYPE="mipssim"

include 	"arch/evbmips/conf/files.mipssim"

/* $NetBSD: autoconf.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2001,2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe and Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/bus.h>

/*
 * Configure all devices on system
 */     
void
cpu_configure(void)
{

	intr_init();

	/* Kick off autoconfiguration. */
	(void)splhigh();
	if (config_rootfound("mainbus", NULL) == NULL)
		panic("no mainbus found");

	spl0();
}

void
cpu_rootconf(void)
{

	rootconf();
}

void
device_register(device_t dev, void *aux)
{

	/* nothing to do here */
}

/* $NetBSD: autoconf.h,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*
 * Copyright 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Simon Burge for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/bus.h>

struct mainbus_attach_args {
	const char	*ma_name;
	unsigned long	ma_addr;
	int		ma_irq;
	bus_space_tag_t	ma_iot;
};

/* $NetBSD: com_mainbus.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2001, 2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe and Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: com_mainbus.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/tty.h>

#include <evbmips/mipssim/autoconf.h>

#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>

struct com_mainbus_softc {
	struct	com_softc sc_com;	/* real "com" softc */

	/* mainbus-specific goo. */
	void	*sc_ih;			/* interrupt handler */
};

static int	com_mainbus_match(device_t, cfdata_t , void *);
static void	com_mainbus_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(com_mainbus, sizeof(struct com_mainbus_softc),
    com_mainbus_match, com_mainbus_attach, NULL, NULL);

int
com_mainbus_match(device_t parent, cfdata_t match, void *aux)
{
	struct mainbus_attach_args *ma = aux;

	/* Always present. */
	if (strcmp(ma->ma_name, match->cf_name) == 0)
		return (1);

	return (0);
}

void
com_mainbus_attach(device_t parent, device_t self, void *aux)
{
	struct com_mainbus_softc *msc = device_private(self);
	struct com_softc *sc = &msc->sc_com;
	struct mainbus_attach_args *ma = aux;
	bus_space_handle_t ioh;

	sc->sc_dev = self;
	if (com_is_console(ma->ma_iot, ma->ma_addr, &ioh) == 0 &&
	    bus_space_map(ma->ma_iot, ma->ma_addr, COM_NPORTS, 0, &ioh) != 0) {
		aprint_error(": can't map i/o space\n");
		return;
	}
	com_init_regs(&sc->sc_regs, ma->ma_iot, ioh, ma->ma_addr);
	sc->sc_frequency = COM_FREQ;

	com_attach_subr(sc);

	msc->sc_ih = evbmips_intr_establish(ma->ma_irq, comintr, sc);
	if (msc->sc_ih == NULL) {
		aprint_error_dev(self, "unable to establish interrupt\n");
		return;
	}
}

/* $NetBSD: if_mipsnetreg.h,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * MIPSSIM emulator MIPSNET ethernet registers
 */

#define	MN_DEVID0		0x00	/* device info */
#define	MN_DEVID1		0x00	/* device info */
#define	MN_BUSY			0x08	/* rx/tx in progress */
#define	MN_RXDATACOUNT		0x0c	/* bytes in rx data buffer */
#define	MN_TXDATACOUNT		0x10	/* bytes for tx data buffer */
#define	MN_INTR			0x14	/* interrupt control */
#define	  MN_INTR_TXDONE	  __BIT(0)	/* tx done interrupt */
#define	  MN_INTR_RXDONE	  __BIT(1)	/* rx data available interrupt */
#define	  MN_INTR_TEST		  __BIT(31)	/* interrupt test */
#define	MN_INTRINFO		0x18	/* core-specific interrupt info */
#define	MN_RXDATA		0x1c	/* rx data fifo */
#define	MN_TXDATA		0x20	/* tx data fifo */

#define	MN_NPORTS		0x24	/* size to map for registers */

#define	MN_MAXDATA		32768	/* largest transfer size */

#define	MIPSNET_DEVID0	0x4d495053	/* ascii "MIPS" */
#define	MIPSNET_DEVID1	0x4e455430	/* ascii "NET0" */

/* $NetBSD: machdep.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2001,2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe and Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_modular.h"

#include <sys/param.h>
#include <sys/boot_flag.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/kcore.h>
#include <sys/kernel.h>
#include <sys/ksyms.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/reboot.h>
#include <sys/termios.h>

#include <uvm/uvm_extern.h>

#include <dev/cons.h>
#include <dev/ic/comvar.h>
#include <dev/ic/ns16450reg.h>

#include <evbmips/mipssim/mipssimreg.h>
#include <evbmips/mipssim/mipssimvar.h>

#include "ksyms.h"

#if NKSYMS || defined(DDB) || defined(MODULAR)
#include <mips/db_machdep.h>
#include <ddb/db_extern.h>
#endif

#include <mips/cache.h>
#include <mips/locore.h>
#include <mips/cpuregs.h>


#define	COMCNRATE	115200		/* not important, emulated device */
#define	COM_FREQ	1843200		/* not important, emulated device */

/* XXX move phys map decl to a general mips location */
/* Maps for VM objects. */
struct vm_map *phys_map = NULL;

struct mipssim_config mipssim_configuration;

/* XXX move mem cluster decls to a general mips location */
int mem_cluster_cnt;
phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];

/* XXX move mach_init() prototype to general mips header file */
void		mach_init(u_long, u_long, u_long, u_long);
static void	mach_init_memory(void);

/*
 * Provide a very simple output-only console driver so that we can
 * use printf() before the "real" console is initialised.
 */
static void uart_putc(dev_t, int);
static struct consdev early_console = {
	.cn_putc = uart_putc,
	.cn_dev = makedev(0, 0),
	.cn_pri = CN_DEAD
};

static void
uart_putc(dev_t dev, int c)
{
	volatile uint8_t *data = (void *)MIPS_PHYS_TO_KSEG1(
	    MIPSSIM_ISA_IO_BASE + MIPSSIM_UART0_ADDR + com_data);

	*data = (uint8_t)c;
	/* emulated UART, don't need to wait for output to drain */
}

static void
cal_timer(void)
{
	uint32_t cntfreq;

	/* Pick a random clock frequency.  XXX Any better way? */
	cntfreq = curcpu()->ci_cpu_freq = 10 * 1000 * 1000;

	if (mips_options.mips_cpu_flags & CPU_MIPS_DOUBLE_COUNT)
		cntfreq /= 2;

	curcpu()->ci_cctr_freq = cntfreq;
	curcpu()->ci_cycles_per_hz = (cntfreq + hz / 2) / hz;

	/* Compute number of cycles per 1us (1/MHz). 0.5MHz is for roundup. */
	curcpu()->ci_divisor_delay = ((cntfreq + 500000) / 1000000);
}

/*
 * 
 */
void
mach_init(u_long arg0, u_long arg1, u_long arg2, u_long arg3)
{
	struct mipssim_config *mcp = &mipssim_configuration;
	void *kernend;
	extern char edata[], end[];	/* XXX */

	kernend = (void *)mips_round_page(end);

	/* Zero BSS.  QEMU appears to leave some memory uninitialised. */
	memset(edata, 0, end - edata);

	/* enough of a console for printf() to work */
	cn_tab = &early_console;

	cal_timer();

	/* set CPU model info for sysctl_hw */
	cpu_setmodel("MIPSSIM");

	mips_vector_init(NULL, false);

	uvm_md_init();

	/*
	 * Initialize bus space tags and bring up the main console.
	 */
	mipssim_bus_io_init(&mcp->mc_iot, mcp);
	if (comcnattach(&mcp->mc_iot, MIPSSIM_UART0_ADDR, COMCNRATE,
	    COM_FREQ, COM_TYPE_NORMAL,
	    (TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8) != 0)
		panic("unable to initialize serial console");

	/*
	 * No way of passing arguments in mipssim.
	 */
	boothowto = RB_AUTOBOOT;
#ifdef KADB
	boothowto |= RB_KDB;
#endif

	mach_init_memory();

	/*
	 * Load the available pages into the VM system.
	 */
	mips_page_physload(MIPS_KSEG0_START, (vaddr_t)kernend,
	    mem_clusters, mem_cluster_cnt, NULL, 0);

	/*
	 * Initialize message buffer (at end of core).
	 */
	mips_init_msgbuf();

	/*
	 * Initialize the virtual memory system.
	 */
	pmap_bootstrap();

	/*
	 * Allocate uarea page for lwp0 and set it.
	 */
	mips_init_lwp0_uarea();

	/*
	 * Initialize debuggers, and break into them, if appropriate.
	 */
#ifdef DDB
	if (boothowto & RB_KDB)
		Debugger();
#endif
}

/*
 * qemu for mipssim doesn't have a way of passing in the memory size, so
 * we probe.  lwp0 hasn't been set up this early, so use a dummy pcb to
 * allow badaddr() to function.  Limit total RAM to just before the IO
 * memory at MIPSSIM_ISA_IO_BASE.
 */
static void
mach_init_memory(void)
{
	struct lwp *l = curlwp;
	struct pcb dummypcb;
	psize_t memsize;
	size_t addr;
	uint32_t *memptr;
	extern char end[];	/* XXX */

	l->l_addr = &dummypcb;
	memsize = roundup2(MIPS_KSEG0_TO_PHYS((uintptr_t)(end)), 1024 * 1024);

	for (addr = memsize; addr < MIPSSIM_ISA_IO_BASE; addr += 1024 * 1024) {
#ifdef MEM_DEBUG
		printf("test %zd MB\n", addr / 1024 * 1024);
#endif
		memptr = (void *)MIPS_PHYS_TO_KSEG1(addr - sizeof(*memptr));

		if (badaddr(memptr, sizeof(uint32_t)) < 0)
			break;

		memsize = addr;
	}
	l->l_addr = NULL;

	printf("Memory size: 0x%" PRIxPSIZE " (%" PRIdPSIZE " MB)\n",
	    memsize, memsize / 1024 / 1024);
	physmem = btoc(memsize);

	mem_clusters[0].start = PAGE_SIZE;
	mem_clusters[0].size = memsize - PAGE_SIZE;
	mem_cluster_cnt = 1;
}

void
consinit(void)
{
	/*
	 * Everything related to console initialization is done
	 * in mach_init().
	 */
}

void
cpu_startup(void)
{

	/*
	 * Do the common startup items.
	 */
	cpu_startup_common();
}

/* XXX try to make this evbmips generic */
void
cpu_reboot(int howto, char *bootstr)
{
	static int waittime = -1;

	/* Take a snapshot before clobbering any registers. */
	savectx(curpcb);

	/* If "always halt" was specified as a boot flag, obey. */
	if (boothowto & RB_HALT)
		howto |= RB_HALT;

	boothowto = howto;

	/* If system is cold, just halt. */
	if (cold) {
		boothowto |= RB_HALT;
		goto haltsys;
	}

	if ((boothowto & RB_NOSYNC) == 0 && waittime < 0) {
		waittime = 0;

		/*
		 * Synchronize the disks....
		 */
		vfs_shutdown();

		/*
		 * If we've been adjusting the clock, the todr
		 * will be out of synch; adjust it now.
		 */
		resettodr();
	}

	/* Disable interrupts. */
	splhigh();

	if (boothowto & RB_DUMP)
		dumpsys();

haltsys:
	/* Run any shutdown hooks. */
	doshutdownhooks();

	/*
	 * Firmware may autoboot (depending on settings), and we cannot pass
	 * flags to it (at least I haven't figured out how to yet), so
	 * we "pseudo-halt" now.
	 */
	if (boothowto & RB_HALT) {
		printf("\n");
		printf("The operating system has halted.\n");
		printf("Please press any key to reboot.\n\n");
		cnpollc(1);	/* For proper keyboard command handling */
		cngetc();
		cnpollc(0);
	}

	printf("resetting...\n\n");
	__asm volatile("jr	%0" :: "r"(MIPS_RESET_EXC_VEC));
	printf("Oops, back from reset\n\nSpinning...");
	for (;;)
		/* spin forever */ ;	/* XXX */
	/*NOTREACHED*/
}

/* $NetBSD: mainbus.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#include <sys/param.h>
#include <sys/device.h>

#include <evbmips/mipssim/autoconf.h>
#include <evbmips/mipssim/mipssimreg.h>
#include <evbmips/mipssim/mipssimvar.h>

static int	mainbus_match(device_t, cfdata_t, void *);
static void	mainbus_attach(device_t, device_t, void *);
static int	mainbus_print(void *, const char *);

CFATTACH_DECL_NEW(mainbus, 0,
    mainbus_match, mainbus_attach, NULL, NULL);

/* There can be only one. */
static int	mainbus_found;

struct mainbusdev {
	const char *md_name;
	paddr_t md_addr;
	int md_irq;
};

static struct mainbusdev mainbusdevs[] = {
	{ "cpu",					},
	{ "com",	MIPSSIM_UART0_ADDR,	2	},
#ifdef notyet
	{ "mipsnet",	MIPSSIM_MIPSNET0_ADDR,	0	},
#endif
	{ NULL,		}
};

static int
mainbus_match(device_t parent, cfdata_t match, void *aux)
{

	if (mainbus_found)
		return (0);

	return (1);
}

static void
mainbus_attach(device_t parent, device_t self, void *aux)
{
	struct mainbus_attach_args maa;
	struct mipssim_config *mcp = &mipssim_configuration;
	const struct mainbusdev *md;

	mainbus_found = 1;
	printf("\n");

	for (md = mainbusdevs; md->md_name != NULL; md++) {
		maa.ma_name = md->md_name;
		maa.ma_addr = md->md_addr;
		maa.ma_irq = md->md_irq;
		maa.ma_iot = &mcp->mc_iot;
		config_found_ia(self, "mainbus", &maa, mainbus_print);
	}
}

static int
mainbus_print(void *aux, const char *pnp)
{

	return (QUIET);
}

/* $NetBSD: mipssim_bus_io.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Platform-specific PCI bus I/O support for the MIPS Malta.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mipssim_bus_io.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#include <sys/param.h>

#include <evbmips/mipssim/mipssimreg.h>
#include <evbmips/mipssim/mipssimvar.h>

#define	CHIP		mipssim
#define	CHIP_IO		/* defined */

#define	CHIP_EX_MALLOC_SAFE(v)	(((struct mipssim_config *)(v))->mc_mallocsafe)
#define	CHIP_EXTENT(v)		(((struct mipssim_config *)(v))->mc_io_ex)

/* IO region 1 */
#define	CHIP_W1_BUS_START(v)	0
#define	CHIP_W1_BUS_END(v)	MIPSSIM_ISA_IO_SIZE
#define	CHIP_W1_SYS_START(v)	MIPSSIM_ISA_IO_BASE
#define	CHIP_W1_SYS_END(v)	(CHIP_W1_SYS_START(v) + CHIP_W1_SYS_START(v))

#include <mips/mips/bus_space_alignstride_chipdep.c>

/* $NetBSD: mipssim_intr.c,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2014 Michael Lorenz
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mipssim_intr.c,v 1.1 2021/01/27 05:24:16 simonb Exp $");

#define __INTR_PRIVATE

#include <sys/param.h>
#include <sys/cpu.h>
#include <sys/kernel.h>
#include <sys/systm.h>

#include <mips/locore.h>
#include <machine/intr.h>

/*
 * This is a mask of bits to clear in the SR when we go to a
 * given hardware interrupt priority level.
 */
static const struct ipl_sr_map mipssim_ipl_sr_map = {
    .sr_bits = {
	[IPL_NONE] =		0,
	[IPL_SOFTCLOCK] =	MIPS_SOFT_INT_MASK_0,
	[IPL_SOFTNET] =		MIPS_SOFT_INT_MASK,
	[IPL_VM] =		MIPS_SOFT_INT_MASK
				    | MIPS_INT_MASK_0 | MIPS_INT_MASK_2,
	[IPL_SCHED] =		MIPS_SOFT_INT_MASK
				    | MIPS_INT_MASK_0 | MIPS_INT_MASK_2
				    | MIPS_INT_MASK_5,
	[IPL_DDB] =		MIPS_INT_MASK,
	[IPL_HIGH] =		MIPS_INT_MASK,
    },
};

/* XXX - add evcnt bits to <machine/intr.h> struct evbmips_intrhand */
struct intrhand {
	LIST_ENTRY(intrhand) ih_q;
	struct evcnt ih_count;
	int (*ih_func)(void *);
	void *ih_arg;
	int ih_irq;
};


/*
 * Use CPU interrupts INT0 .. INT4.  Clock interrupts (INT5)
 * are handled in cpu_intr() before evbmips_iointr() is called.
 */
#define	NINTR		5	/* MIPS INT0 - INT4 */

struct intrhand intrs[NINTR];
const char * const intrnames[NINTR] = {
	"int 0 (mipsnet)",
	"int 1 (unused)",
	"int 2 (uart)",
	"int 3 (unused)",
	"int 4 (unused)",
};

void mipssim_irq(int);

void
evbmips_intr_init(void)
{
	int i;

	ipl_sr_map = mipssim_ipl_sr_map;

	/* zero all handlers */
	for (i = 0; i < NINTR; i++) {
		intrs[i].ih_func = NULL;
		intrs[i].ih_arg = NULL;
		intrs[i].ih_irq = i;
		evcnt_attach_dynamic(&intrs[i].ih_count, EVCNT_TYPE_INTR,
		    NULL, "cpu", intrnames[i]);
	}
}

void
evbmips_iointr(int ipl, uint32_t ipending, struct clockframe *cf)
{

	for (int level = NINTR - 1; level >= 0; level--) {
		struct intrhand *ih;

		if ((ipending & (MIPS_INT_MASK_0 << level)) == 0)
			continue;

		ih = &intrs[level];

		ih->ih_count.ev_count++;
		if (ih->ih_func) {
			(*ih->ih_func)(ih->ih_arg);
		}
	}
}

void *
evbmips_intr_establish(int irq, int (*func)(void *), void *arg)
{
	struct intrhand *ih;
	int s;

	if ((irq < 0) || (irq >= NINTR)) {
		aprint_error("%s: invalid irq %d\n", __func__, irq);
		return NULL;
	}

	ih = &intrs[irq];

	s = splhigh();
	ih->ih_func = func;
	ih->ih_arg = arg;

	/* now enable the IRQ (nothing to do here?) */

	splx(s);

	return ih;
}

void
evbmips_intr_disestablish(void *cookie)
{
	panic("untested %s", __func__);	/* XXX! */

	struct intrhand *ih = cookie;
	int s;

	s = splhigh();

	/* now disable the IRQ (nothing to do here?) */

	ih->ih_func = NULL;
	ih->ih_arg = NULL;

	splx(s);
}

/* $NetBSD: mipssimreg.h,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */


/*
 *	Memory Map
 *
 *	0000.0000	128MB	RAM (max ~500MB)
 *	1fd0.0000	 64kB	ISA IO space
 *
 *	CPU interrupts
 *
 *	 0	mipsnet
 *	 2	16450 UART
 */

#define	MIPSSIM_UART0_ADDR	0x3f8
#define	MIPSSIM_MIPSNET0_ADDR	0x4200

#define	MIPSSIM_ISA_IO_BASE	0x1fd00000  /* ISA IO memory:	*/
#define	MIPSSIM_ISA_IO_SIZE	0x00010000  /*    64 kByte	*/

/* $NetBSD: mipssimvar.h,v 1.1 2021/01/27 05:24:16 simonb Exp $ */

/*-
 * Copyright (c) 2001,2021 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/bus.h>
#include <dev/isa/isavar.h>

struct mipssim_config {
	struct mips_bus_space mc_iot;

	struct mips_isa_chipset mc_ic;

	struct extent *mc_io_ex;

	int	mc_mallocsafe;
};

extern struct mipssim_config mipssim_configuration;

void	mipssim_bus_io_init(bus_space_tag_t, void *);