evbmips/malta/machdep.c

/*	$NetBSD: machdep.c,v 1.11 2003/06/14 17:01:11 thorpej Exp $	*/

/*
 * Copyright 2001, 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe and 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.
 */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department, The Mach Operating System project at
 * Carnegie-Mellon University and Ralph Campbell.
 *
 * 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 by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)machdep.c   8.3 (Berkeley) 1/12/94
 *	from: Utah Hdr: machdep.c 1.63 91/04/24
 */

#include "opt_ddb.h"
#include "opt_execfmt.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/user.h>
#include <sys/mount.h>
#include <sys/kcore.h>
#include <sys/boot_flag.h>
#include <sys/termios.h>
#include <sys/ksyms.h>

#include <uvm/uvm_extern.h>

#include <dev/cons.h>

#include "ksyms.h"

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

#include <machine/cpu.h>
#include <machine/psl.h>
#include <machine/yamon.h>

#include <evbmips/malta/autoconf.h>
#include <evbmips/malta/maltareg.h>
#include <evbmips/malta/maltavar.h>

#include "com.h"
#if NCOM > 0
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>

int	comcnrate = 38400;	/* XXX should be config option */
#endif /* NCOM > 0 */


#define REGVAL(x)       *((__volatile u_int32_t *)(MIPS_PHYS_TO_KSEG1((x))))

struct malta_config malta_configuration;

/* For sysctl_hw. */
extern char cpu_model[];

/* Our exported CPU info; we can have only one. */
struct cpu_info cpu_info_store;

/* Maps for VM objects. */
struct vm_map *exec_map = NULL;
struct vm_map *mb_map = NULL;
struct vm_map *phys_map = NULL;

int	physmem;		/* Total physical memory */

int	netboot;		/* Are we netbooting? */

yamon_env_var *yamon_envp;

phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;

void	configure(void);
void	mach_init(int, char **, yamon_env_var *, u_long);

/*
 * safepri is a safe priority for sleep to set for a spin-wait during
 * autoconfiguration or after a panic.  Used as an argument to splx().
 */
int	safepri = MIPS1_PSL_LOWIPL;

extern struct user *proc0paddr;

/*
 * Do all the stuff that locore normally does before calling main().
 */
void
mach_init(int argc, char **argv, yamon_env_var *envp, u_long memsize)
{
	struct malta_config *mcp = &malta_configuration;
	bus_space_handle_t sh;
	caddr_t kernend, v;
        u_long first, last;
	vsize_t size;
	char *cp;
	int i, howto;
	uint8_t *brkres = (uint8_t *)MIPS_PHYS_TO_KSEG1(MALTA_BRKRES);

	extern char edata[], end[];

	*brkres = 0;	/* Disable BREAK==reset on console */

	/* Get the propaganda in early! */
	led_display_str("NetBSD");

	/*
	 * Clear the BSS segment.
	 */
	kernend = (caddr_t)mips_round_page(end);
	memset(edata, 0, kernend - edata);

	/* save the yamon environment pointer */
	yamon_envp = envp;

	/* Use YAMON callbacks for early console I/O */
	cn_tab = &yamon_promcd;

	/*
	 * Set up the exception vectors and cpu-specific function
	 * vectors early on.  We need the wbflush() vector set up
	 * before comcnattach() is called (or at least before the
	 * first printf() after that is called).
	 * Also clears the I+D caches.
	 */
	mips_vector_init();

	/* set the VM page size */
	uvm_setpagesize();

	physmem = btoc(memsize);

	gt_pci_init(&mcp->mc_pc, &mcp->mc_gt);
	malta_bus_io_init(&mcp->mc_iot, mcp);
	malta_bus_mem_init(&mcp->mc_memt, mcp);
	malta_dma_init(mcp);

	/*
	 * Calibrate the timer, delay() relies on this.
	 */
	bus_space_map(&mcp->mc_iot, MALTA_RTCADR, 2, 0, &sh);
	malta_cal_timer(&mcp->mc_iot, sh);
	bus_space_unmap(&mcp->mc_iot, sh, 2);

#if NCOM > 0
	/*
	 * Delay to allow firmware putchars to complete.
	 * FIFO depth * character time.
	 * character time = (1000000 / (defaultrate / 10))
	 */
	delay(160000000 / comcnrate);
	if (comcnattach(&mcp->mc_iot, MALTA_UART0ADR, comcnrate,
	    COM_FREQ, COM_TYPE_NORMAL,
	    (TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8) != 0)
		panic("malta: unable to initialize serial console");
#else
	panic("malta: not configured to use serial console");
#endif /* NCOM > 0 */

	consinit();

	mem_clusters[0].start = 0;
	mem_clusters[0].size = ctob(physmem);
	mem_cluster_cnt = 1;

	strcpy(cpu_model, "MIPS Malta Evaluation Board");

	/*
	 * XXX: check argv[0] - do something if "gdb"???
	 */

	/*
	 * Look at arguments passed to us and compute boothowto.
	 */
	boothowto = RB_AUTOBOOT;
	for (i = 1; i < argc; i++) {
		for (cp = argv[i]; *cp; cp++) {
			/* Ignore superfluous '-', if there is one */
			if (*cp == '-')
				continue;

			howto = 0;
			BOOT_FLAG(*cp, howto);
			if (! howto)
				printf("bootflag '%c' not recognised\n", *cp);
			else
				boothowto |= howto;
		}
	}

	/*
	 * Load the rest of the available pages into the VM system.
	 */
	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
	last = mem_clusters[0].start + mem_clusters[0].size;
	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
		VM_FREELIST_DEFAULT);

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

	/*
	 * Compute the size of system data structures.  pmap_bootstrap()
	 * needs some of this information.
	 */
	size = (vsize_t)allocsys(NULL, NULL);

	pmap_bootstrap();

	/*
	 * Allocate space for proc0's USPACE.
	 */
	v = (caddr_t)uvm_pageboot_alloc(USPACE);
	lwp0.l_addr = proc0paddr = (struct user *)v;
	lwp0.l_md.md_regs = (struct frame *)(v + USPACE) - 1;
	curpcb = &lwp0.l_addr->u_pcb;
	curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */

	/*
	 * Allocate space for system data structures.  These data structures
	 * are allocated here instead of cpu_startup() because physical
	 * memory is directly addressable.  We don't have to map these into
	 * the virtual address space.
	 */
	v = (caddr_t)uvm_pageboot_alloc(size);
	if ((allocsys(v, NULL) - v) != size)
		panic("mach_init: table size inconsistency");

	/*
	 * Initialize debuggers, and break into them, if appropriate.
	 */
#if NKSYMS || defined(DDB) || defined(LKM)
	ksyms_init(0, 0, 0);
#endif

#if defined(DDB)
	if (boothowto & RB_KDB)
		Debugger();
#endif
}

void
consinit(void)
{

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

/*
 * Allocate memory for variable-sized tables,
 */
void
cpu_startup()
{
	u_int i, base, residual;
	vaddr_t minaddr, maxaddr;
	vsize_t size;
	char pbuf[9];

	/*
	 * Good {morning,afternoon,evening,night}.
	 */
	printf(version);
	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
	printf("%s memory", pbuf);

	/*
	 * Virtual memory is bootstrapped -- notify the bus spaces
	 * that memory allocation is now safe.
	 */
	malta_configuration.mc_mallocsafe = 1;

	/*
	 * Allocate virtual address space for file I/O buffers.
	 * Note they are different than the array of headers, 'buf',
	 * and usually occupy more virtual memory than physical.
	 */
	size = MAXBSIZE * nbuf;
	if (uvm_map(kernel_map, (vaddr_t *)&buffers, round_page(size),
		    NULL, UVM_UNKNOWN_OFFSET, 0,
		    UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
		    UVM_ADV_NORMAL, 0)) != 0)
		panic("startup: cannot allocate VM for buffers");
	minaddr = (vaddr_t)buffers;
	base = bufpages / nbuf;
	residual = bufpages % nbuf;
	for (i = 0; i < nbuf; i++) {
		vsize_t curbufsize;
		vaddr_t curbuf;
		struct vm_page *pg;

		/*
		 * Each buffer has MAXBSIZE bytes of VM space allocated.  Of
		 * that MAXBSIZE space, we allocate and map (base+1) pages
		 * for the first "residual" buffers, and then we allocate
		 * "base" pages for the rest.
		 */
		curbuf = (vaddr_t) buffers + (i * MAXBSIZE);
		curbufsize = PAGE_SIZE * ((i < residual) ? (base + 1) : base);

		while (curbufsize) {
			pg = uvm_pagealloc(NULL, 0, NULL, 0);
			if (pg == NULL)
				panic("cpu_startup: not enough memory for "
					"buffer cache");
			pmap_kenter_pa(curbuf, VM_PAGE_TO_PHYS(pg),
				       VM_PROT_READ|VM_PROT_WRITE);
			curbuf += PAGE_SIZE;
			curbufsize -= PAGE_SIZE;
		}
	}
	pmap_update(pmap_kernel());

	/*
	 * Allocate a submap for exec arguments.  This map effectively
	 * limits the number of processes exec'ing at any time.
	 */
	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
				    16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);
	/*
	 * Allocate a submap for physio.
	 */
	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
				    VM_PHYS_SIZE, 0, FALSE, NULL);

	/*
	 * (No need to allocate an mbuf cluster submap.  Mbuf clusters
	 * are allocated via the pool allocator, and we use KSEG to
	 * map those pages.)
	 */

	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
	printf(", %s free", pbuf);
	format_bytes(pbuf, sizeof(pbuf), bufpages * PAGE_SIZE);
	printf(", %s in %u buffers\n", pbuf, nbuf);

	/*
	 * Set up buffers, so they can be used to read disk labels.
	 */
	bufinit();
}

int	waittime = -1;

void
cpu_reboot(howto, bootstr)
	int howto;
	char *bootstr;
{

	/* Take a snapshot before clobbering any registers. */
	if (curproc)
		savectx((struct user *)curpcb);

	if (cold) {
		howto |= RB_HALT;
		goto haltsys;
	}

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

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

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

	splhigh();

	if (howto & RB_DUMP)
		dumpsys();

haltsys:
	doshutdownhooks();

	if (howto & 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("%s\n\n", ((howto & RB_HALT) != 0) ? "halted." : "rebooting...");
	yamon_exit(boothowto);
	printf("Oops, back from yamon_exit()\n\nResetting...");

	REGVAL(MALTA_SOFTRES) = MALTA_GORESET;

	/*
	 * Need a small delay here, otherwise we see the first few characters of
	 * the warning below.
	 */
	delay(80000);

	printf("WARNING: reset failed!\nSpinning...");

	for (;;)
		/* spin forever */ ;	/* XXX */
}