xref: /src/sys/arch/arm/arm32/arm32_machdep.c

/*	$NetBSD: arm32_machdep.c,v 1.56 2008/04/27 18:58:43 matt Exp $	*/

/*
 * Copyright (c) 1994-1998 Mark Brinicombe.
 * Copyright (c) 1994 Brini.
 * All rights reserved.
 *
 * This code is derived from software written for Brini by Mark Brinicombe
 *
 * 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 Mark Brinicombe
 *	for the NetBSD Project.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * Machine dependant functions for kernel setup
 *
 * Created      : 17/09/94
 * Updated	: 18/04/01 updated for new wscons
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: arm32_machdep.c,v 1.56 2008/04/27 18:58:43 matt Exp $");

#include "opt_md.h"
#include "opt_cpuoptions.h"
#include "opt_pmap_debug.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/msgbuf.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
#include <sys/cpu.h>

#include <dev/cons.h>

#include <arm/arm32/katelib.h>
#include <arm/arm32/machdep.h>
#include <machine/bootconfig.h>

#include "md.h"

struct vm_map *exec_map = NULL;
struct vm_map *mb_map = NULL;
struct vm_map *phys_map = NULL;

extern int physmem;

#if NMD > 0 && defined(MEMORY_DISK_HOOKS) && !defined(MEMORY_DISK_ROOT_SIZE)
extern size_t md_root_size;		/* Memory disc size */
#endif	/* NMD && MEMORY_DISK_HOOKS && !MEMORY_DISK_ROOT_SIZE */

pv_addr_t kernelstack;

/* the following is used externally (sysctl_hw) */
char	machine[] = MACHINE;		/* from <machine/param.h> */
char	machine_arch[] = MACHINE_ARCH;	/* from <machine/param.h> */

/* Our exported CPU info; we can have only one. */
struct cpu_info cpu_info_store = {
	.ci_cpl = IPL_HIGH,
#ifndef PROCESS_ID_IS_CURLWP
	.ci_curlwp = &lwp0,
#endif
};

void *	msgbufaddr;
extern paddr_t msgbufphys;

int kernel_debug = 0;

struct user *proc0paddr;

/* exported variable to be filled in by the bootloaders */
char *booted_kernel;


/* Prototypes */

void data_abort_handler		__P((trapframe_t *frame));
void prefetch_abort_handler	__P((trapframe_t *frame));
extern void configure		__P((void));

/*
 * arm32_vector_init:
 *
 *	Initialize the vector page, and select whether or not to
 *	relocate the vectors.
 *
 *	NOTE: We expect the vector page to be mapped at its expected
 *	destination.
 */
void
arm32_vector_init(vaddr_t va, int which)
{
	extern unsigned int page0[], page0_data[];
	unsigned int *vectors = (int *) va;
	unsigned int *vectors_data = vectors + (page0_data - page0);
	int vec;

	/*
	 * Loop through the vectors we're taking over, and copy the
	 * vector's insn and data word.
	 */
	for (vec = 0; vec < ARM_NVEC; vec++) {
		if ((which & (1 << vec)) == 0) {
			/* Don't want to take over this vector. */
			continue;
		}
		vectors[vec] = page0[vec];
		vectors_data[vec] = page0_data[vec];
	}

	/* Now sync the vectors. */
	cpu_icache_sync_range(va, (ARM_NVEC * 2) * sizeof(u_int));

	vector_page = va;

	if (va == ARM_VECTORS_HIGH) {
		/*
		 * Assume the MD caller knows what it's doing here, and
		 * really does want the vector page relocated.
		 *
		 * Note: This has to be done here (and not just in
		 * cpu_setup()) because the vector page needs to be
		 * accessible *before* cpu_startup() is called.
		 * Think ddb(9) ...
		 *
		 * NOTE: If the CPU control register is not readable,
		 * this will totally fail!  We'll just assume that
		 * any system that has high vector support has a
		 * readable CPU control register, for now.  If we
		 * ever encounter one that does not, we'll have to
		 * rethink this.
		 */
		cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
	}
}

/*
 * Debug function just to park the CPU
 */

void
halt()
{
	while (1)
		cpu_sleep(0);
}


/* Sync the discs and unmount the filesystems */

void
bootsync(void)
{
	static int bootsyncdone = 0;

	if (bootsyncdone) return;

	bootsyncdone = 1;

	/* Make sure we can still manage to do things */
	if (GetCPSR() & I32_bit) {
		/*
		 * If we get here then boot has been called without RB_NOSYNC
		 * and interrupts were disabled. This means the boot() call
		 * did not come from a user process e.g. shutdown, but must
		 * have come from somewhere in the kernel.
		 */
		IRQenable;
		printf("Warning IRQ's disabled during boot()\n");
	}

	vfs_shutdown();
}

/*
 * void cpu_startup(void)
 *
 * Machine dependant startup code.
 *
 */
void
cpu_startup()
{
	vaddr_t minaddr;
	vaddr_t maxaddr;
	u_int loop;
	char pbuf[9];

	/* Set the CPU control register */
	cpu_setup(boot_args);

	/* Lock down zero page */
	vector_page_setprot(VM_PROT_READ);

	/*
	 * Give pmap a chance to set up a few more things now the vm
	 * is initialised
	 */
	pmap_postinit();

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

	/* msgbufphys was setup during the secondary boot strap */
	for (loop = 0; loop < btoc(MSGBUFSIZE); ++loop)
		pmap_kenter_pa((vaddr_t)msgbufaddr + loop * PAGE_SIZE,
		    msgbufphys + loop * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE);
	pmap_update(pmap_kernel());
	initmsgbuf(msgbufaddr, round_page(MSGBUFSIZE));

	/*
	 * Identify ourselves for the msgbuf (everything printed earlier will
	 * not be buffered).
	 */
	printf("%s%s", copyright, version);

	format_bytes(pbuf, sizeof(pbuf), arm_ptob(physmem));
	printf("total memory = %s\n", pbuf);

	minaddr = 0;

	/*
	 * 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);

	/*
	 * Finally, allocate mbuf cluster submap.
	 */
	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
				 nmbclusters * mclbytes, VM_MAP_INTRSAFE,
				 false, NULL);

	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
	printf("avail memory = %s\n", pbuf);

	curpcb = &lwp0.l_addr->u_pcb;
	curpcb->pcb_flags = 0;
	curpcb->pcb_un.un_32.pcb32_sp = (u_int)lwp0.l_addr +
	    USPACE_SVC_STACK_TOP;

        curpcb->pcb_tf = (struct trapframe *)curpcb->pcb_un.un_32.pcb32_sp - 1;
}

/*
 * machine dependent system variables.
 */
static int
sysctl_machdep_booted_device(SYSCTLFN_ARGS)
{
	struct sysctlnode node;

	if (booted_device == NULL)
		return (EOPNOTSUPP);

	node = *rnode;
	node.sysctl_data = booted_device->dv_xname;
	node.sysctl_size = strlen(booted_device->dv_xname) + 1;
	return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

static int
sysctl_machdep_booted_kernel(SYSCTLFN_ARGS)
{
	struct sysctlnode node;

	if (booted_kernel == NULL || booted_kernel[0] == '\0')
		return (EOPNOTSUPP);

	node = *rnode;
	node.sysctl_data = booted_kernel;
	node.sysctl_size = strlen(booted_kernel) + 1;
	return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

static int
sysctl_machdep_powersave(SYSCTLFN_ARGS)
{
	struct sysctlnode node = *rnode;
	int error, newval;

	newval = cpu_do_powersave;
	node.sysctl_data = &newval;
	if (cpufuncs.cf_sleep == (void *) cpufunc_nullop)
		node.sysctl_flags &= ~CTLFLAG_READWRITE;
	error = sysctl_lookup(SYSCTLFN_CALL(&node));
	if (error || newp == NULL || newval == cpu_do_powersave)
		return (error);

	if (newval < 0 || newval > 1)
		return (EINVAL);
	cpu_do_powersave = newval;

	return (0);
}

SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
{

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "machdep", NULL,
		       NULL, 0, NULL, 0,
		       CTL_MACHDEP, CTL_EOL);

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "debug", NULL,
		       NULL, 0, &kernel_debug, 0,
		       CTL_MACHDEP, CPU_DEBUG, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRING, "booted_device", NULL,
		       sysctl_machdep_booted_device, 0, NULL, 0,
		       CTL_MACHDEP, CPU_BOOTED_DEVICE, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRING, "booted_kernel", NULL,
		       sysctl_machdep_booted_kernel, 0, NULL, 0,
		       CTL_MACHDEP, CPU_BOOTED_KERNEL, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRUCT, "console_device", NULL,
		       sysctl_consdev, 0, NULL, sizeof(dev_t),
		       CTL_MACHDEP, CPU_CONSDEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "powersave", NULL,
		       sysctl_machdep_powersave, 0, &cpu_do_powersave, 0,
		       CTL_MACHDEP, CPU_POWERSAVE, CTL_EOL);
}

void
parse_mi_bootargs(args)
	char *args;
{
	int integer;

	if (get_bootconf_option(args, "single", BOOTOPT_TYPE_BOOLEAN, &integer)
	    || get_bootconf_option(args, "-s", BOOTOPT_TYPE_BOOLEAN, &integer))
		if (integer)
			boothowto |= RB_SINGLE;
	if (get_bootconf_option(args, "kdb", BOOTOPT_TYPE_BOOLEAN, &integer)
	    || get_bootconf_option(args, "-k", BOOTOPT_TYPE_BOOLEAN, &integer))
		if (integer)
			boothowto |= RB_KDB;
	if (get_bootconf_option(args, "ask", BOOTOPT_TYPE_BOOLEAN, &integer)
	    || get_bootconf_option(args, "-a", BOOTOPT_TYPE_BOOLEAN, &integer))
		if (integer)
			boothowto |= RB_ASKNAME;

#ifdef PMAP_DEBUG
	if (get_bootconf_option(args, "pmapdebug", BOOTOPT_TYPE_INT, &integer)) {
		pmap_debug_level = integer;
		pmap_debug(pmap_debug_level);
	}
#endif	/* PMAP_DEBUG */

/*	if (get_bootconf_option(args, "nbuf", BOOTOPT_TYPE_INT, &integer))
		bufpages = integer;*/

#if NMD > 0 && defined(MEMORY_DISK_HOOKS) && !defined(MEMORY_DISK_ROOT_SIZE)
	if (get_bootconf_option(args, "memorydisc", BOOTOPT_TYPE_INT, &integer)
	    || get_bootconf_option(args, "memorydisk", BOOTOPT_TYPE_INT, &integer)) {
		md_root_size = integer;
		md_root_size *= 1024;
		if (md_root_size < 32*1024)
			md_root_size = 32*1024;
		if (md_root_size > 2048*1024)
			md_root_size = 2048*1024;
	}
#endif	/* NMD && MEMORY_DISK_HOOKS && !MEMORY_DISK_ROOT_SIZE */

	if (get_bootconf_option(args, "quiet", BOOTOPT_TYPE_BOOLEAN, &integer)
	    || get_bootconf_option(args, "-q", BOOTOPT_TYPE_BOOLEAN, &integer))
		if (integer)
			boothowto |= AB_QUIET;
	if (get_bootconf_option(args, "verbose", BOOTOPT_TYPE_BOOLEAN, &integer)
	    || get_bootconf_option(args, "-v", BOOTOPT_TYPE_BOOLEAN, &integer))
		if (integer)
			boothowto |= AB_VERBOSE;
}

void
cpu_need_resched(struct cpu_info *ci, int flags)
{
	bool immed = (flags & RESCHED_IMMED) != 0;

	if (ci->ci_want_resched && !immed)
		return;

	ci->ci_want_resched = 1;
	if (curlwp != ci->ci_data.cpu_idlelwp)
		setsoftast();
}

bool
cpu_intr_p(void)
{
	return curcpu()->ci_intr_depth != 0;
}

#ifdef __HAVE_FAST_SOFTINTS
#if IPL_SOFTSERIAL != IPL_SOFTNET + 1
#error IPLs are screwed up
#endif
#if IPL_SOFTNET != IPL_SOFTBIO + 1
#error IPLs are screwed up
#endif
#if IPL_SOFTBIO != IPL_SOFTCLOCK + 1
#error IPLs are screwed up
#endif
#if !(IPL_SOFTCLOCK > IPL_NONE)
#error IPLs are screwed up
#endif
#define	SOFTINT2IPLMAP \
	((IPL_SOFTSERIAL << (SOFTINT_SERIAL * 4)) | \
	 (IPL_SOFTNET    << (SOFTINT_NET    * 4)) | \
	 (IPL_SOFTBIO    << (SOFTINT_BIO    * 4)) | \
	 (IPL_SOFTCLOCK  << (SOFTINT_CLOCK  * 4)))
#define	SOFTINT2IPL(l)	((SOFTINT2IPLMAP >> ((l) * 4)) & 0x0f)

/*
 * This returns a mask of softint IPLs that be dispatch at <ipl>
 * We want to shift 2 since we want a mask of <ipl> + 1.
 * SOFTIPLMASK(IPL_NONE)	= 0xfffffffe
 * SOFTIPLMASK(IPL_SOFTCLOCK)	= 0xffffffe0
 */
#define	SOFTIPLMASK(ipl) ((~((2 << (ipl)) - 1)) & (15 << IPL_SOFTCLOCK))

void softint_switch(lwp_t *, int);

void
softint_trigger(uintptr_t mask)
{
	curcpu()->ci_softints |= mask;
}

void
softint_init_md(lwp_t *l, u_int level, uintptr_t *machdep)
{
	lwp_t ** lp = &curcpu()->ci_softlwps[level];
	KASSERT(*lp == NULL || *lp == l);
	*lp = l;
	*machdep = 1 << SOFTINT2IPL(level);
}

void
dosoftints(void)
{
	struct cpu_info * const ci = curcpu();
	const int opl = ci->ci_cpl;
	const uint32_t softiplmask = SOFTIPLMASK(opl);

	for (;;) {
		u_int softints = ci->ci_softints & softiplmask;
		if (softints == 0)
			return;
		ci->ci_cpl = IPL_HIGH;
#define	DOSOFTINT(n) \
		if (softints & (1 << IPL_SOFT ## n)) { \
			ci->ci_softints &= ~(1 << IPL_SOFT ## n); \
			softint_switch(ci->ci_softlwps[SOFTINT_ ## n], \
			    IPL_SOFT ## n); \
			ci->ci_cpl = opl; \
			continue; \
		}
		DOSOFTINT(SERIAL);
		DOSOFTINT(NET);
		DOSOFTINT(BIO);
		DOSOFTINT(CLOCK);
		panic("dosoftints wtf (softints=%u?, ipl=%d)", softints, opl);
	}
}
#endif /* __HAVE_FAST_SOFTINTS */