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cpu.c revision 1.6 
      1 /* $NetBSD: cpu.c,v 1.6 2009/11/27 03:23:14 rmind Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.6 2009/11/27 03:23:14 rmind Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/conf.h>
     34 #include <sys/proc.h>
     35 #include <sys/systm.h>
     36 #include <sys/device.h>
     37 #include <sys/reboot.h>
     38 #include <sys/lwp.h>
     39 #include <sys/cpu.h>
     40 #include <sys/mbuf.h>
     41 
     42 #include <dev/cons.h>
     43 
     44 #include <machine/cpu.h>
     45 #include <machine/mainbus.h>
     46 
     47 #include <uvm/uvm_extern.h>
     48 #include <uvm/uvm_page.h>
     49 
     50 /* #define CPU_DEBUG */
     51 
     52 static int	cpu_match(device_t, cfdata_t, void *);
     53 static void	cpu_attach(device_t, device_t, void *);
     54 
     55 struct cpu_info cpu_info_primary;
     56 char cpu_model[48] = "virtual processor";
     57 
     58 typedef struct cpu_softc {
     59 	device_t	sc_dev;
     60 	struct cpu_info	*sc_ci;
     61 } cpu_softc_t;
     62 
     63 CFATTACH_DECL_NEW(cpu, sizeof(cpu_softc_t), cpu_match, cpu_attach, NULL, NULL);
     64 
     65 static int
     66 cpu_match(device_t parent, cfdata_t match, void *opaque)
     67 {
     68 	struct thunkbus_attach_args *taa = opaque;
     69 
     70 	if (taa->taa_type != THUNKBUS_TYPE_CPU)
     71 		return 0;
     72 
     73 	return 1;
     74 }
     75 
     76 static void
     77 cpu_attach(device_t parent, device_t self, void *opaque)
     78 {
     79 	cpu_softc_t *sc = device_private(self);
     80 
     81 	aprint_naive("\n");
     82 	aprint_normal("\n");
     83 
     84 	sc->sc_dev = self;
     85 	sc->sc_ci = &cpu_info_primary;
     86 	sc->sc_ci->ci_dev = 0;
     87 	sc->sc_ci->ci_self = &cpu_info_primary;
     88 #if notyet
     89 	sc->sc_ci->ci_curlwp = &lwp0;
     90 #endif
     91 }
     92 
     93 void
     94 cpu_configure(void)
     95 {
     96 	if (config_rootfound("mainbus", NULL) == NULL)
     97 		panic("configure: mainbus not configured");
     98 
     99 	spl0();
    100 }
    101 
    102 void
    103 cpu_reboot(int howto, char *bootstr)
    104 {
    105 	extern void exit(int);
    106 	extern void abort(void);
    107 
    108 	splhigh();
    109 
    110 	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
    111 		exit(0);
    112 
    113 	if (howto & RB_HALT) {
    114 		printf("\n");
    115 		printf("The operating system has halted.\n");
    116 		printf("Please press any key to reboot.\n\n");
    117 		cnpollc(1);
    118 		cngetc();
    119 		cnpollc(0);
    120 	}
    121 
    122 	printf("rebooting...\n");
    123 
    124 	/*
    125 	 * XXXJDM If we've panic'd, make sure we dump a core
    126 	 */
    127 	abort();
    128 
    129 	/* NOTREACHED */
    130 }
    131 
    132 void
    133 cpu_need_resched(struct cpu_info *ci, int flags)
    134 {
    135 	ci->ci_want_resched = 1;
    136 }
    137 
    138 void
    139 cpu_need_proftick(struct lwp *l)
    140 {
    141 }
    142 
    143 lwp_t *
    144 cpu_switchto(lwp_t *oldlwp, lwp_t *newlwp, bool returning)
    145 {
    146 	extern int errno;
    147 	struct pcb *oldpcb = oldlwp ? lwp_getpcb(oldlwp) : NULL;
    148 	struct pcb *newpcb = lwp_getpcb(newlwp);
    149 	struct cpu_info *ci = curcpu();
    150 
    151 #ifdef CPU_DEBUG
    152 	printf("cpu_switchto [%s] -> [%s]\n",
    153 	    oldlwp ? oldlwp->l_name : "none",
    154 	    newlwp ? newlwp->l_name : "none");
    155 	if (oldpcb) {
    156 		printf("    oldpcb uc_link=%p, uc_stack.ss_sp=%p, "
    157 		    "uc_stack.ss_size=%d\n",
    158 		    oldpcb->pcb_ucp.uc_link,
    159 		    oldpcb->pcb_ucp.uc_stack.ss_sp,
    160 		    (int)oldpcb->pcb_ucp.uc_stack.ss_size);
    161 	}
    162 	if (newpcb) {
    163 		printf("    newpcb uc_link=%p, uc_stack.ss_sp=%p, "
    164 		    "uc_stack.ss_size=%d\n",
    165 		    newpcb->pcb_ucp.uc_link,
    166 		    newpcb->pcb_ucp.uc_stack.ss_sp,
    167 		    (int)newpcb->pcb_ucp.uc_stack.ss_size);
    168 	}
    169 #endif /* !CPU_DEBUG */
    170 
    171 	ci->ci_stash = oldlwp;
    172 	curlwp = newlwp;
    173 	if (oldpcb) {
    174 		if (swapcontext(&oldpcb->pcb_ucp, &newpcb->pcb_ucp))
    175 			panic("swapcontext failed: %d", errno);
    176 	} else {
    177 		if (setcontext(&newpcb->pcb_ucp))
    178 			panic("setcontext failed: %d", errno);
    179 	}
    180 
    181 #ifdef CPU_DEBUG
    182 	printf("cpu_switchto: returning %p (was %p)\n", ci->ci_stash, oldlwp);
    183 #endif
    184 	return ci->ci_stash;
    185 }
    186 
    187 void
    188 cpu_dumpconf(void)
    189 {
    190 #ifdef CPU_DEBUG
    191 	printf("cpu_dumpconf\n");
    192 #endif
    193 }
    194 
    195 void
    196 cpu_signotify(struct lwp *l)
    197 {
    198 #ifdef CPU_DEBUG
    199 	printf("cpu_signotify\n");
    200 #endif
    201 }
    202 
    203 void
    204 cpu_getmcontext(struct lwp *l, mcontext_t *mcp, unsigned int *flags)
    205 {
    206 #ifdef CPU_DEBUG
    207 	printf("cpu_getmcontext\n");
    208 #endif
    209 }
    210 
    211 int
    212 cpu_setmcontext(struct lwp *l, const mcontext_t *mcp, unsigned int flags)
    213 {
    214 #ifdef CPU_DEBUG
    215 	printf("cpu_setmcontext\n");
    216 #endif
    217 	return 0;
    218 }
    219 
    220 void
    221 cpu_idle(void)
    222 {
    223 	extern int usleep(useconds_t);
    224 	struct cpu_info *ci = curcpu();
    225 
    226 	if (ci->ci_want_resched)
    227 		return;
    228 
    229 #if notyet
    230 	usleep(10000);
    231 #endif
    232 }
    233 
    234 void
    235 cpu_lwp_free(struct lwp *l, int proc)
    236 {
    237 #ifdef CPU_DEBUG
    238 	printf("cpu_lwp_free\n");
    239 #endif
    240 }
    241 
    242 void
    243 cpu_lwp_free2(struct lwp *l)
    244 {
    245 	struct pcb *pcb = lwp_getpcb(l);
    246 
    247 #ifdef CPU_DEBUG
    248 	printf("cpu_lwp_free2\n");
    249 #endif
    250 
    251 	if (pcb == NULL)
    252 		return;
    253 
    254 	if (pcb->pcb_needfree) {
    255 		free(pcb->pcb_ucp.uc_stack.ss_sp, M_TEMP);
    256 		pcb->pcb_ucp.uc_stack.ss_sp = NULL;
    257 		pcb->pcb_ucp.uc_stack.ss_size = 0;
    258 		pcb->pcb_needfree = false;
    259 	}
    260 }
    261 
    262 static void
    263 cpu_lwp_trampoline(void (*func)(void *), void *arg)
    264 {
    265 	lwp_startup(curcpu()->ci_stash, curlwp);
    266 
    267 	func(arg);
    268 }
    269 
    270 void
    271 cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize,
    272     void (*func)(void *), void *arg)
    273 {
    274 	extern int errno;
    275 	struct pcb *pcb = lwp_getpcb(l2);
    276 
    277 #ifdef CPU_DEBUG
    278 	printf("cpu_lwp_fork [%s/%p] -> [%s/%p] stack=%p stacksize=%d\n",
    279 	    l1 ? l1->l_name : "none", l1,
    280 	    l2 ? l2->l_name : "none", l2,
    281 	    stack, (int)stacksize);
    282 #endif
    283 
    284 	/* XXXJDM */
    285 	if (stack == NULL) {
    286 		stack = malloc(PAGE_SIZE, M_TEMP, M_NOWAIT);
    287 		stacksize = PAGE_SIZE;
    288 		pcb->pcb_needfree = true;
    289 	} else
    290 		pcb->pcb_needfree = false;
    291 
    292 	if (getcontext(&pcb->pcb_ucp))
    293 		panic("getcontext failed: %d", errno);
    294 	pcb->pcb_ucp.uc_stack.ss_sp = stack;
    295 	pcb->pcb_ucp.uc_stack.ss_size = stacksize;
    296 	pcb->pcb_ucp.uc_link = NULL;
    297 	pcb->pcb_ucp.uc_flags = _UC_STACK | _UC_CPU;
    298 	makecontext(&pcb->pcb_ucp, (void (*)(void))cpu_lwp_trampoline,
    299 	    2, func, arg);
    300 }
    301 
    302 void
    303 cpu_initclocks(void)
    304 {
    305 }
    306 
    307 void
    308 cpu_startup(void)
    309 {
    310 	extern struct vm_map *mb_map;
    311 	vaddr_t minaddr, maxaddr;
    312 	char pbuf[9];
    313 
    314 	printf("%s%s", copyright, version);
    315 	format_bytes(pbuf, sizeof(pbuf), ptoa(physmem));
    316 	printf("total memory = %s\n", pbuf);
    317 
    318 	minaddr = 0;
    319 	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
    320 	    nmbclusters * mclbytes, VM_MAP_INTRSAFE, false, NULL);
    321 
    322 	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
    323 	printf("avail memory = %s\n", pbuf);
    324 }
    325 
    326 void
    327 cpu_rootconf(void)
    328 {
    329 	device_t rdev;
    330 
    331 	rdev = device_find_by_xname("md0");
    332 
    333 	setroot(rdev, 0);
    334 }
    335 
    336 bool
    337 cpu_intr_p(void)
    338 {
    339 	printf("cpu_intr_p\n");
    340 	return false;
    341 }
    342