platform.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Peter Grehan 5 * Copyright (c) 2009 Nathan Whitehorn 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/11/sys/powerpc/powerpc/platform.c 330897 2018-03-14 03:19:51Z eadler $"); 33 34/* 35 * Dispatch platform calls to the appropriate platform implementation 36 * through a previously registered kernel object. 37 */ 38 39#include <sys/param.h> 40#include <sys/kernel.h> 41#include <sys/lock.h> 42#include <sys/ktr.h> 43#include <sys/mutex.h> 44#include <sys/proc.h> 45#include <sys/systm.h> 46#include <sys/smp.h> 47#include <sys/sysctl.h> 48#include <sys/types.h> 49 50#include <vm/vm.h> 51#include <vm/vm_page.h> 52 53#include <machine/cpu.h> 54#include <machine/md_var.h> 55#include <machine/platform.h> 56#include <machine/platformvar.h> 57#include <machine/smp.h> 58 59#include "platform_if.h" 60 61static platform_def_t *plat_def_impl; 62static platform_t plat_obj; 63static struct kobj_ops plat_kernel_kops; 64static struct platform_kobj plat_kernel_obj; 65 66static char plat_name[64] = ""; 67SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RD | CTLFLAG_TUN, 68 plat_name, 0, "Platform currently in use"); 69 70static struct mem_region pregions[PHYS_AVAIL_SZ]; 71static struct mem_region aregions[PHYS_AVAIL_SZ]; 72static int npregions, naregions; 73 74/* 75 * Memory region utilities: determine if two regions overlap, 76 * and merge two overlapping regions into one 77 */ 78static int 79memr_overlap(struct mem_region *r1, struct mem_region *r2) 80{ 81 if ((r1->mr_start + r1->mr_size) < r2->mr_start || 82 (r2->mr_start + r2->mr_size) < r1->mr_start) 83 return (FALSE); 84 85 return (TRUE); 86} 87 88static void 89memr_merge(struct mem_region *from, struct mem_region *to) 90{ 91 vm_offset_t end; 92 end = uqmax(to->mr_start + to->mr_size, from->mr_start + from->mr_size); 93 to->mr_start = uqmin(from->mr_start, to->mr_start); 94 to->mr_size = end - to->mr_start; 95} 96 97/* 98 * Quick sort callout for comparing memory regions. 99 */ 100static int 101mr_cmp(const void *a, const void *b) 102{ 103 const struct mem_region *regiona, *regionb; 104 105 regiona = a; 106 regionb = b; 107 if (regiona->mr_start < regionb->mr_start) 108 return (-1); 109 else if (regiona->mr_start > regionb->mr_start) 110 return (1); 111 else 112 return (0); 113} 114 115void 116mem_regions(struct mem_region **phys, int *physsz, struct mem_region **avail, 117 int *availsz) 118{ 119 int i, j, still_merging; 120 121 if (npregions == 0) { 122 PLATFORM_MEM_REGIONS(plat_obj, pregions, &npregions, 123 aregions, &naregions); 124 qsort(pregions, npregions, sizeof(*pregions), mr_cmp); 125 qsort(aregions, naregions, sizeof(*aregions), mr_cmp); 126 127 /* Remove overlapping available regions */ 128 do { 129 still_merging = FALSE; 130 for (i = 0; i < naregions; i++) { 131 if (aregions[i].mr_size == 0) 132 continue; 133 for (j = i+1; j < naregions; j++) { 134 if (aregions[j].mr_size == 0) 135 continue; 136 if (!memr_overlap(&aregions[j], 137 &aregions[i])) 138 continue; 139 140 memr_merge(&aregions[j], &aregions[i]); 141 /* mark inactive */ 142 aregions[j].mr_size = 0; 143 still_merging = TRUE; 144 } 145 } 146 } while (still_merging == TRUE); 147 148 /* Collapse zero-length available regions */ 149 for (i = 0; i < naregions; i++) { 150 if (aregions[i].mr_size == 0) { 151 memcpy(&aregions[i], &aregions[i+1], 152 (naregions - i - 1)*sizeof(*aregions)); 153 naregions--; 154 i--; 155 } 156 } 157 } 158 159 *phys = pregions; 160 *avail = aregions; 161 *physsz = npregions; 162 *availsz = naregions; 163} 164 165int 166mem_valid(vm_offset_t addr, int len) 167{ 168 int i; 169 170 if (npregions == 0) { 171 struct mem_region *p, *a; 172 int na, np; 173 mem_regions(&p, &np, &a, &na); 174 } 175 176 for (i = 0; i < npregions; i++) 177 if ((addr >= pregions[i].mr_start) 178 && (addr + len <= pregions[i].mr_start + pregions[i].mr_size)) 179 return (0); 180 181 return (EFAULT); 182} 183 184vm_offset_t 185platform_real_maxaddr(void) 186{ 187 return (PLATFORM_REAL_MAXADDR(plat_obj)); 188} 189 190const char * 191installed_platform() 192{ 193 return (plat_def_impl->name); 194} 195 196u_long 197platform_timebase_freq(struct cpuref *cpu) 198{ 199 return (PLATFORM_TIMEBASE_FREQ(plat_obj, cpu)); 200} 201 202/* 203 * Put the current CPU, as last step in suspend, to sleep 204 */ 205void 206platform_sleep() 207{ 208 PLATFORM_SLEEP(plat_obj); 209} 210 211int 212platform_smp_first_cpu(struct cpuref *cpu) 213{ 214 return (PLATFORM_SMP_FIRST_CPU(plat_obj, cpu)); 215} 216 217int 218platform_smp_next_cpu(struct cpuref *cpu) 219{ 220 return (PLATFORM_SMP_NEXT_CPU(plat_obj, cpu)); 221} 222 223int 224platform_smp_get_bsp(struct cpuref *cpu) 225{ 226 return (PLATFORM_SMP_GET_BSP(plat_obj, cpu)); 227} 228 229int 230platform_smp_start_cpu(struct pcpu *cpu) 231{ 232 return (PLATFORM_SMP_START_CPU(plat_obj, cpu)); 233} 234 235void 236platform_smp_ap_init() 237{ 238 PLATFORM_SMP_AP_INIT(plat_obj); 239} 240 241#ifdef SMP 242struct cpu_group * 243cpu_topo(void) 244{ 245 return (PLATFORM_SMP_TOPO(plat_obj)); 246} 247#endif 248 249/* 250 * Reset back to firmware. 251 */ 252void 253cpu_reset() 254{ 255 PLATFORM_RESET(plat_obj); 256} 257 258int 259cpu_idle_wakeup(int cpu) 260{ 261 return (PLATFORM_IDLE_WAKEUP(plat_obj, cpu)); 262} 263 264void 265platform_cpu_idle(int cpu) 266{ 267 268 PLATFORM_IDLE(plat_obj, cpu); 269} 270 271/* 272 * Platform install routines. Highest priority wins, using the same 273 * algorithm as bus attachment. 274 */ 275SET_DECLARE(platform_set, platform_def_t); 276 277void 278platform_probe_and_attach() 279{ 280 platform_def_t **platpp, *platp; 281 int prio, best_prio; 282 283 plat_obj = &plat_kernel_obj; 284 best_prio = 0; 285 286 /* 287 * Try to locate the best platform kobj 288 */ 289 SET_FOREACH(platpp, platform_set) { 290 platp = *platpp; 291 292 /* 293 * Take care of compiling the selected class, and 294 * then statically initialise the MMU object 295 */ 296 kobj_class_compile_static(platp, &plat_kernel_kops); 297 kobj_init_static((kobj_t)plat_obj, platp); 298 299 prio = PLATFORM_PROBE(plat_obj); 300 301 /* Check for errors */ 302 if (prio > 0) 303 continue; 304 305 /* 306 * Check if this module was specifically requested through 307 * the loader tunable we provide. 308 */ 309 if (strcmp(platp->name,plat_name) == 0) { 310 plat_def_impl = platp; 311 break; 312 } 313 314 /* Otherwise, see if it is better than our current best */ 315 if (plat_def_impl == NULL || prio > best_prio) { 316 best_prio = prio; 317 plat_def_impl = platp; 318 } 319 320 /* 321 * We can't free the KOBJ, since it is static. Reset the ops 322 * member of this class so that we can come back later. 323 */ 324 platp->ops = NULL; 325 } 326 327 if (plat_def_impl == NULL) 328 panic("No platform module found!"); 329 330 /* 331 * Recompile to make sure we ended with the 332 * correct one, and then attach. 333 */ 334 335 kobj_class_compile_static(plat_def_impl, &plat_kernel_kops); 336 kobj_init_static((kobj_t)plat_obj, plat_def_impl); 337 338 strlcpy(plat_name,plat_def_impl->name,sizeof(plat_name)); 339 340 PLATFORM_ATTACH(plat_obj); 341} 342 343