1261643Sian/*- 2261643Sian * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> 3261643Sian * All rights excluded. 4261643Sian * 5261643Sian * Redistribution and use in source and binary forms, with or without 6261643Sian * modification, are permitted provided that the following conditions 7261643Sian * are met: 8261643Sian * 1. Redistributions of source code must retain the above copyright 9261643Sian * notice, this list of conditions and the following disclaimer. 10261643Sian * 2. Redistributions in binary form must reproduce the above copyright 11261643Sian * notice, this list of conditions and the following disclaimer in the 12261643Sian * documentation and/or other materials provided with the distribution. 13261643Sian * 14261643Sian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15261643Sian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16261643Sian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17261643Sian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18261643Sian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19261643Sian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20261643Sian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21261643Sian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22261643Sian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23261643Sian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24261643Sian * SUCH DAMAGE. 25261643Sian */ 26261643Sian 27261643Sian#include <sys/cdefs.h> 28261643Sian__FBSDID("$FreeBSD: releng/10.3/sys/arm/arm/physmem.c 294685 2016-01-24 22:00:36Z ian $"); 29261643Sian 30261643Sian#include "opt_ddb.h" 31261643Sian 32261643Sian/* 33261643Sian * Routines for describing and initializing anything related to physical memory. 34261643Sian */ 35261643Sian 36261643Sian#include <sys/param.h> 37261643Sian#include <sys/systm.h> 38261643Sian#include <vm/vm.h> 39278730Sian#include <machine/md_var.h> 40261643Sian#include <machine/physmem.h> 41261643Sian 42261643Sian/* 43261643Sian * These structures are used internally to keep track of regions of physical 44261643Sian * ram, and regions within the physical ram that need to be excluded. An 45261643Sian * exclusion region can be excluded from crash dumps, from the vm pool of pages 46261643Sian * that can be allocated, or both, depending on the exclusion flags associated 47261643Sian * with the region. 48261643Sian */ 49261643Sian#define MAX_HWCNT 10 50261643Sian#define MAX_EXCNT 10 51261643Sian 52261643Sianstruct region { 53266194Sian vm_paddr_t addr; 54261643Sian vm_size_t size; 55261643Sian uint32_t flags; 56261643Sian}; 57261643Sian 58261643Sianstatic struct region hwregions[MAX_HWCNT]; 59261643Sianstatic struct region exregions[MAX_EXCNT]; 60261643Sian 61261643Sianstatic size_t hwcnt; 62261643Sianstatic size_t excnt; 63261643Sian 64261643Sian/* 65261643Sian * These "avail lists" are globals used to communicate physical memory layout to 66261643Sian * other parts of the kernel. Within the arrays, each value is the starting 67261643Sian * address of a contiguous area of physical address space. The values at even 68261643Sian * indexes are areas that contain usable memory and the values at odd indexes 69261643Sian * are areas that aren't usable. Each list is terminated by a pair of zero 70261643Sian * entries. 71261643Sian * 72261643Sian * dump_avail tells the dump code what regions to include in a crash dump, and 73261643Sian * phys_avail is the way we hand all the remaining physical ram we haven't used 74261643Sian * in early kernel init over to the vm system for allocation management. 75261643Sian * 76261643Sian * We size these arrays to hold twice as many available regions as we allow for 77261643Sian * hardware memory regions, to allow for the fact that exclusions can split a 78261643Sian * hardware region into two or more available regions. In the real world there 79261643Sian * will typically be one or two hardware regions and two or three exclusions. 80261643Sian * 81261643Sian * Each available region in this list occupies two array slots (the start of the 82261643Sian * available region and the start of the unavailable region that follows it). 83261643Sian */ 84261643Sian#define MAX_AVAIL_REGIONS (MAX_HWCNT * 2) 85261643Sian#define MAX_AVAIL_ENTRIES (MAX_AVAIL_REGIONS * 2) 86261643Sian 87261643Sianvm_paddr_t phys_avail[MAX_AVAIL_ENTRIES + 2]; /* +2 to allow for a pair */ 88261643Sianvm_paddr_t dump_avail[MAX_AVAIL_ENTRIES + 2]; /* of zeroes to terminate. */ 89261643Sian 90278730Sian/* 91278730Sian * realmem is the total number of hardware pages, excluded or not. 92278730Sian * Maxmem is one greater than the last physical page number. 93278730Sian */ 94261643Sianlong realmem; 95278730Sianlong Maxmem; 96261643Sian 97266194Sian/* The address at which the kernel was loaded. Set early in initarm(). */ 98266194Sianvm_paddr_t arm_physmem_kernaddr; 99266194Sian 100261643Sian/* 101261643Sian * Print the contents of the physical and excluded region tables using the 102261643Sian * provided printf-like output function (which will be either printf or 103261643Sian * db_printf). 104261643Sian */ 105261643Sianstatic void 106261643Sianphysmem_dump_tables(int (*prfunc)(const char *, ...)) 107261643Sian{ 108261643Sian int flags, i; 109261643Sian uintmax_t addr, size; 110261643Sian const unsigned int mbyte = 1024 * 1024; 111261643Sian 112261643Sian prfunc("Physical memory chunk(s):\n"); 113261643Sian for (i = 0; i < hwcnt; ++i) { 114261643Sian addr = hwregions[i].addr; 115261643Sian size = hwregions[i].size; 116261643Sian prfunc(" 0x%08jx - 0x%08jx, %5ju MB (%7ju pages)\n", addr, 117261643Sian addr + size - 1, size / mbyte, size / PAGE_SIZE); 118261643Sian } 119261643Sian 120261643Sian prfunc("Excluded memory regions:\n"); 121261643Sian for (i = 0; i < excnt; ++i) { 122261643Sian addr = exregions[i].addr; 123261643Sian size = exregions[i].size; 124261643Sian flags = exregions[i].flags; 125261643Sian prfunc(" 0x%08jx - 0x%08jx, %5ju MB (%7ju pages) %s %s\n", 126261643Sian addr, addr + size - 1, size / mbyte, size / PAGE_SIZE, 127261643Sian (flags & EXFLAG_NOALLOC) ? "NoAlloc" : "", 128261643Sian (flags & EXFLAG_NODUMP) ? "NoDump" : ""); 129261643Sian } 130266194Sian 131266194Sian#ifdef DEBUG 132266194Sian prfunc("Avail lists:\n"); 133266194Sian for (i = 0; phys_avail[i] != 0; ++i) { 134266194Sian prfunc(" phys_avail[%d] 0x%08x\n", i, phys_avail[i]); 135266194Sian } 136266194Sian for (i = 0; dump_avail[i] != 0; ++i) { 137266194Sian prfunc(" dump_avail[%d] 0x%08x\n", i, dump_avail[i]); 138266194Sian } 139266194Sian#endif 140261643Sian} 141261643Sian 142261643Sian/* 143261643Sian * Print the contents of the static mapping table. Used for bootverbose. 144261643Sian */ 145261643Sianvoid 146261643Sianarm_physmem_print_tables() 147261643Sian{ 148261643Sian 149261643Sian physmem_dump_tables(printf); 150261643Sian} 151261643Sian 152261643Sian/* 153261643Sian * Walk the list of hardware regions, processing it against the list of 154261643Sian * exclusions that contain the given exflags, and generating an "avail list". 155261643Sian * 156283319Sian * Updates the value at *pavail with the sum of all pages in all hw regions. 157261643Sian * 158261643Sian * Returns the number of pages of non-excluded memory added to the avail list. 159261643Sian */ 160278730Sianstatic size_t 161278730Sianregions_to_avail(vm_paddr_t *avail, uint32_t exflags, long *pavail) 162261643Sian{ 163261643Sian size_t acnt, exi, hwi; 164294685Sian uint64_t end, start, xend, xstart; 165261643Sian long availmem; 166261643Sian const struct region *exp, *hwp; 167261643Sian 168261643Sian realmem = 0; 169261643Sian availmem = 0; 170261643Sian acnt = 0; 171261643Sian for (hwi = 0, hwp = hwregions; hwi < hwcnt; ++hwi, ++hwp) { 172261643Sian start = hwp->addr; 173261643Sian end = hwp->size + start; 174294685Sian realmem += arm32_btop((vm_offset_t)(end - start)); 175261643Sian for (exi = 0, exp = exregions; exi < excnt; ++exi, ++exp) { 176273676Sian /* 177273676Sian * If the excluded region does not match given flags, 178273676Sian * continue checking with the next excluded region. 179273676Sian */ 180273676Sian if ((exp->flags & exflags) == 0) 181273676Sian continue; 182261643Sian xstart = exp->addr; 183261643Sian xend = exp->size + xstart; 184261643Sian /* 185261643Sian * If the excluded region ends before this hw region, 186261643Sian * continue checking with the next excluded region. 187261643Sian */ 188261643Sian if (xend <= start) 189261643Sian continue; 190261643Sian /* 191261643Sian * If the excluded region begins after this hw region 192261643Sian * we're done because both lists are sorted. 193261643Sian */ 194261643Sian if (xstart >= end) 195261643Sian break; 196261643Sian /* 197261643Sian * If the excluded region completely covers this hw 198261643Sian * region, shrink this hw region to zero size. 199261643Sian */ 200261643Sian if ((start >= xstart) && (end <= xend)) { 201261643Sian start = xend; 202261643Sian end = xend; 203261643Sian break; 204261643Sian } 205261643Sian /* 206261643Sian * If the excluded region falls wholly within this hw 207261643Sian * region without abutting or overlapping the beginning 208261643Sian * or end, create an available entry from the leading 209261643Sian * fragment, then adjust the start of this hw region to 210261643Sian * the end of the excluded region, and continue checking 211261643Sian * the next excluded region because another exclusion 212261643Sian * could affect the remainder of this hw region. 213261643Sian */ 214261643Sian if ((xstart > start) && (xend < end)) { 215294685Sian avail[acnt++] = (vm_paddr_t)start; 216294685Sian avail[acnt++] = (vm_paddr_t)xstart; 217294685Sian availmem += 218294685Sian arm32_btop((vm_offset_t)(xstart - start)); 219261643Sian start = xend; 220261643Sian continue; 221261643Sian } 222261643Sian /* 223266194Sian * We know the excluded region overlaps either the start 224266194Sian * or end of this hardware region (but not both), trim 225266194Sian * the excluded portion off the appropriate end. 226261643Sian */ 227266194Sian if (xstart <= start) 228266194Sian start = xend; 229266194Sian else 230261643Sian end = xstart; 231261643Sian } 232261643Sian /* 233261643Sian * If the trimming actions above left a non-zero size, create an 234261643Sian * available entry for it. 235261643Sian */ 236261643Sian if (end > start) { 237294685Sian avail[acnt++] = (vm_paddr_t)start; 238294685Sian avail[acnt++] = (vm_paddr_t)end; 239294685Sian availmem += arm32_btop((vm_offset_t)(end - start)); 240261643Sian } 241261643Sian if (acnt >= MAX_AVAIL_ENTRIES) 242261643Sian panic("Not enough space in the dump/phys_avail arrays"); 243261643Sian } 244261643Sian 245278730Sian if (pavail) 246278730Sian *pavail = availmem; 247278730Sian return (acnt); 248261643Sian} 249261643Sian 250261643Sian/* 251261643Sian * Insertion-sort a new entry into a regions list; sorted by start address. 252261643Sian */ 253261643Sianstatic void 254266194Sianinsert_region(struct region *regions, size_t rcnt, vm_paddr_t addr, 255261643Sian vm_size_t size, uint32_t flags) 256261643Sian{ 257261643Sian size_t i; 258261643Sian struct region *ep, *rp; 259261643Sian 260261643Sian ep = regions + rcnt; 261261643Sian for (i = 0, rp = regions; i < rcnt; ++i, ++rp) { 262261643Sian if (addr < rp->addr) { 263261643Sian bcopy(rp, rp + 1, (ep - rp) * sizeof(*rp)); 264261643Sian break; 265261643Sian } 266261643Sian } 267261643Sian rp->addr = addr; 268261643Sian rp->size = size; 269261643Sian rp->flags = flags; 270261643Sian} 271261643Sian 272261643Sian/* 273261643Sian * Add a hardware memory region. 274261643Sian */ 275261643Sianvoid 276266194Sianarm_physmem_hardware_region(vm_paddr_t pa, vm_size_t sz) 277261643Sian{ 278261643Sian vm_offset_t adj; 279261643Sian 280261643Sian /* 281261643Sian * Filter out the page at PA 0x00000000. The VM can't handle it, as 282261643Sian * pmap_extract() == 0 means failure. 283294685Sian * 284294685Sian * Also filter out the page at the end of the physical address space -- 285294685Sian * if addr is non-zero and addr+size is zero we wrapped to the next byte 286294685Sian * beyond what vm_paddr_t can express. That leads to a NULL pointer 287294685Sian * deref early in startup; work around it by leaving the last page out. 288294685Sian * 289294685Sian * XXX This just in: subtract out a whole megabyte, not just 1 page. 290294685Sian * Reducing the size by anything less than 1MB results in the NULL 291294685Sian * pointer deref in _vm_map_lock_read(). Better to give up a megabyte 292294685Sian * than leave some folks with an unusable system while we investigate. 293261643Sian */ 294261643Sian if (pa == 0) { 295261643Sian pa = PAGE_SIZE; 296261643Sian sz -= PAGE_SIZE; 297294685Sian } else if (pa + sz == 0) { 298294685Sian sz -= 1024 * 1024; 299261643Sian } 300261643Sian 301261643Sian /* 302261643Sian * Round the starting address up to a page boundary, and truncate the 303261643Sian * ending page down to a page boundary. 304261643Sian */ 305261643Sian adj = round_page(pa) - pa; 306261643Sian pa = round_page(pa); 307261643Sian sz = trunc_page(sz - adj); 308261643Sian 309261643Sian if (hwcnt < nitems(hwregions)) 310261643Sian insert_region(hwregions, hwcnt++, pa, sz, 0); 311261643Sian} 312261643Sian 313261643Sian/* 314261643Sian * Add an exclusion region. 315261643Sian */ 316266194Sianvoid arm_physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t exflags) 317261643Sian{ 318261643Sian vm_offset_t adj; 319261643Sian 320261643Sian /* 321261643Sian * Truncate the starting address down to a page boundary, and round the 322261643Sian * ending page up to a page boundary. 323261643Sian */ 324261643Sian adj = pa - trunc_page(pa); 325261643Sian pa = trunc_page(pa); 326261643Sian sz = round_page(sz + adj); 327261643Sian 328261643Sian if (excnt < nitems(exregions)) 329261643Sian insert_region(exregions, excnt++, pa, sz, exflags); 330261643Sian} 331261643Sian 332261643Sian/* 333261643Sian * Process all the regions added earlier into the global avail lists. 334278730Sian * 335278730Sian * Updates the kernel global 'physmem' with the number of physical pages 336278730Sian * available for use (all pages not in any exclusion region). 337278730Sian * 338278730Sian * Updates the kernel global 'Maxmem' with the page number one greater then the 339278730Sian * last page of physical memory in the system. 340261643Sian */ 341261643Sianvoid 342261643Sianarm_physmem_init_kernel_globals(void) 343261643Sian{ 344278730Sian size_t nextidx; 345261643Sian 346278730Sian regions_to_avail(dump_avail, EXFLAG_NODUMP, NULL); 347278730Sian nextidx = regions_to_avail(phys_avail, EXFLAG_NOALLOC, &physmem); 348278730Sian if (nextidx == 0) 349278730Sian panic("No memory entries in phys_avail"); 350278730Sian Maxmem = atop(phys_avail[nextidx - 1]); 351261643Sian} 352261643Sian 353261643Sian#ifdef DDB 354261643Sian#include <ddb/ddb.h> 355261643Sian 356261643SianDB_SHOW_COMMAND(physmem, db_show_physmem) 357261643Sian{ 358261643Sian 359261643Sian physmem_dump_tables(db_printf); 360261643Sian} 361261643Sian 362261643Sian#endif /* DDB */ 363261643Sian 364