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cpu.c revision 1.11 
      1 /* $NetBSD: cpu.c,v 1.11 2011/08/12 11:37:04 jmcneill 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 1.11 2011/08/12 11:37:04 jmcneill 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 #include <machine/pcb.h>
     47 #include <machine/thunk.h>
     48 
     49 #include <uvm/uvm_extern.h>
     50 #include <uvm/uvm_page.h>
     51 
     52 /* #define CPU_DEBUG */
     53 
     54 static int	cpu_match(device_t, cfdata_t, void *);
     55 static void	cpu_attach(device_t, device_t, void *);
     56 
     57 struct cpu_info cpu_info_primary;
     58 char cpu_model[48] = "virtual processor";
     59 
     60 typedef struct cpu_softc {
     61 	device_t	sc_dev;
     62 	struct cpu_info	*sc_ci;
     63 } cpu_softc_t;
     64 
     65 static ucontext_t lwp0pcb;
     66 
     67 CFATTACH_DECL_NEW(cpu, sizeof(cpu_softc_t), cpu_match, cpu_attach, NULL, NULL);
     68 
     69 static int
     70 cpu_match(device_t parent, cfdata_t match, void *opaque)
     71 {
     72 	struct thunkbus_attach_args *taa = opaque;
     73 
     74 	if (taa->taa_type != THUNKBUS_TYPE_CPU)
     75 		return 0;
     76 
     77 	return 1;
     78 }
     79 
     80 static void
     81 cpu_attach(device_t parent, device_t self, void *opaque)
     82 {
     83 	cpu_softc_t *sc = device_private(self);
     84 
     85 	aprint_naive("\n");
     86 	aprint_normal("\n");
     87 
     88 	sc->sc_dev = self;
     89 	sc->sc_ci = &cpu_info_primary;
     90 	sc->sc_ci->ci_dev = 0;
     91 	sc->sc_ci->ci_self = &cpu_info_primary;
     92 	sc->sc_ci->ci_curlwp = &lwp0;
     93 
     94 	if (thunk_getcontext(&lwp0pcb))
     95 		panic("getcontext failed");
     96 	uvm_lwp_setuarea(&lwp0, (vaddr_t)&lwp0pcb);
     97 }
     98 
     99 void
    100 cpu_configure(void)
    101 {
    102 	if (config_rootfound("mainbus", NULL) == NULL)
    103 		panic("configure: mainbus not configured");
    104 
    105 	spl0();
    106 }
    107 
    108 void
    109 cpu_reboot(int howto, char *bootstr)
    110 {
    111 	extern void usermode_reboot(void);
    112 
    113 	splhigh();
    114 
    115 	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
    116 		thunk_exit(0);
    117 
    118 	if (howto & RB_HALT) {
    119 		printf("\n");
    120 		printf("The operating system has halted.\n");
    121 		printf("Please press any key to reboot.\n\n");
    122 		cnpollc(1);
    123 		cngetc();
    124 		cnpollc(0);
    125 	}
    126 
    127 	printf("rebooting...\n");
    128 
    129 	usermode_reboot();
    130 
    131 	/* NOTREACHED */
    132 }
    133 
    134 void
    135 cpu_need_resched(struct cpu_info *ci, int flags)
    136 {
    137 	ci->ci_want_resched |= flags;
    138 }
    139 
    140 void
    141 cpu_need_proftick(struct lwp *l)
    142 {
    143 }
    144 
    145 lwp_t *
    146 cpu_switchto(lwp_t *oldlwp, lwp_t *newlwp, bool returning)
    147 {
    148 	extern int errno;
    149 	struct pcb *oldpcb = oldlwp ? lwp_getpcb(oldlwp) : NULL;
    150 	struct pcb *newpcb = lwp_getpcb(newlwp);
    151 	struct cpu_info *ci = curcpu();
    152 
    153 #ifdef CPU_DEBUG
    154 	printf("cpu_switchto [%s] -> [%s]\n",
    155 	    oldlwp ? oldlwp->l_name : "none",
    156 	    newlwp ? newlwp->l_name : "none");
    157 	if (oldpcb) {
    158 		printf("    oldpcb uc_link=%p, uc_stack.ss_sp=%p, "
    159 		    "uc_stack.ss_size=%d\n",
    160 		    oldpcb->pcb_ucp.uc_link,
    161 		    oldpcb->pcb_ucp.uc_stack.ss_sp,
    162 		    (int)oldpcb->pcb_ucp.uc_stack.ss_size);
    163 	}
    164 	if (newpcb) {
    165 		printf("    newpcb uc_link=%p, uc_stack.ss_sp=%p, "
    166 		    "uc_stack.ss_size=%d\n",
    167 		    newpcb->pcb_ucp.uc_link,
    168 		    newpcb->pcb_ucp.uc_stack.ss_sp,
    169 		    (int)newpcb->pcb_ucp.uc_stack.ss_size);
    170 	}
    171 #endif /* !CPU_DEBUG */
    172 
    173 	ci->ci_stash = oldlwp;
    174 	curlwp = newlwp;
    175 	if (oldpcb) {
    176 		if (thunk_swapcontext(&oldpcb->pcb_ucp, &newpcb->pcb_ucp))
    177 			panic("swapcontext failed: %d", errno);
    178 	} else {
    179 		if (thunk_setcontext(&newpcb->pcb_ucp))
    180 			panic("setcontext failed: %d", errno);
    181 	}
    182 
    183 #ifdef CPU_DEBUG
    184 	printf("cpu_switchto: returning %p (was %p)\n", ci->ci_stash, oldlwp);
    185 #endif
    186 	return ci->ci_stash;
    187 }
    188 
    189 void
    190 cpu_dumpconf(void)
    191 {
    192 #ifdef CPU_DEBUG
    193 	printf("cpu_dumpconf\n");
    194 #endif
    195 }
    196 
    197 void
    198 cpu_signotify(struct lwp *l)
    199 {
    200 #ifdef CPU_DEBUG
    201 	printf("cpu_signotify\n");
    202 #endif
    203 }
    204 
    205 void
    206 cpu_getmcontext(struct lwp *l, mcontext_t *mcp, unsigned int *flags)
    207 {
    208 #ifdef CPU_DEBUG
    209 	printf("cpu_getmcontext\n");
    210 #endif
    211 }
    212 
    213 int
    214 cpu_setmcontext(struct lwp *l, const mcontext_t *mcp, unsigned int flags)
    215 {
    216 #ifdef CPU_DEBUG
    217 	printf("cpu_setmcontext\n");
    218 #endif
    219 	return 0;
    220 }
    221 
    222 void
    223 cpu_idle(void)
    224 {
    225 	struct cpu_info *ci = curcpu();
    226 
    227 	if (ci->ci_want_resched)
    228 		return;
    229 
    230 #if notyet
    231 	thunk_usleep(10000);
    232 #endif
    233 }
    234 
    235 void
    236 cpu_lwp_free(struct lwp *l, int proc)
    237 {
    238 #ifdef CPU_DEBUG
    239 	printf("cpu_lwp_free\n");
    240 #endif
    241 }
    242 
    243 void
    244 cpu_lwp_free2(struct lwp *l)
    245 {
    246 	struct pcb *pcb = lwp_getpcb(l);
    247 
    248 #ifdef CPU_DEBUG
    249 	printf("cpu_lwp_free2\n");
    250 #endif
    251 
    252 	if (pcb == NULL)
    253 		return;
    254 
    255 	if (pcb->pcb_needfree) {
    256 		free(pcb->pcb_ucp.uc_stack.ss_sp, M_TEMP);
    257 		pcb->pcb_ucp.uc_stack.ss_sp = NULL;
    258 		pcb->pcb_ucp.uc_stack.ss_size = 0;
    259 		pcb->pcb_needfree = false;
    260 	}
    261 }
    262 
    263 static void
    264 cpu_lwp_trampoline(void (*func)(void *), void *arg)
    265 {
    266 	lwp_startup(curcpu()->ci_stash, curlwp);
    267 
    268 	func(arg);
    269 }
    270 
    271 void
    272 cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize,
    273     void (*func)(void *), void *arg)
    274 {
    275 	extern int errno;
    276 	struct pcb *pcb = lwp_getpcb(l2);
    277 
    278 #ifdef CPU_DEBUG
    279 	printf("cpu_lwp_fork [%s/%p] -> [%s/%p] stack=%p stacksize=%d\n",
    280 	    l1 ? l1->l_name : "none", l1,
    281 	    l2 ? l2->l_name : "none", l2,
    282 	    stack, (int)stacksize);
    283 #endif
    284 
    285 	/* XXXJDM */
    286 	if (stack == NULL) {
    287 		stack = malloc(PAGE_SIZE, M_TEMP, M_NOWAIT);
    288 		stacksize = PAGE_SIZE;
    289 		pcb->pcb_needfree = true;
    290 	} else
    291 		pcb->pcb_needfree = false;
    292 
    293 	if (thunk_getcontext(&pcb->pcb_ucp))
    294 		panic("getcontext failed: %d", errno);
    295 	pcb->pcb_ucp.uc_stack.ss_sp = stack;
    296 	pcb->pcb_ucp.uc_stack.ss_size = stacksize;
    297 	pcb->pcb_ucp.uc_link = NULL;
    298 	pcb->pcb_ucp.uc_flags = _UC_STACK | _UC_CPU;
    299 	thunk_makecontext(&pcb->pcb_ucp, (void (*)(void))cpu_lwp_trampoline,
    300 	    2, func, arg);
    301 }
    302 
    303 void
    304 cpu_initclocks(void)
    305 {
    306 }
    307 
    308 void
    309 cpu_startup(void)
    310 {
    311 	char pbuf[9];
    312 
    313 	printf("%s%s", copyright, version);
    314 	format_bytes(pbuf, sizeof(pbuf), ptoa(physmem));
    315 	printf("total memory = %s\n", pbuf);
    316 
    317 	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
    318 	printf("avail memory = %s\n", pbuf);
    319 }
    320 
    321 void
    322 cpu_rootconf(void)
    323 {
    324 	device_t rdev;
    325 
    326 	rdev = device_find_by_xname("md0");
    327 
    328 	setroot(rdev, 0);
    329 }
    330 
    331 bool
    332 cpu_intr_p(void)
    333 {
    334 	printf("cpu_intr_p\n");
    335 	return false;
    336 }
    337