/*- * Copyright (c) 1998 Michael Smith * All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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. */ #include __FBSDID("$FreeBSD$"); /* * Obtain memory configuration information from the BIOS */ #include #include #include "bootstrap.h" #include "libi386.h" #include "btxv86.h" #include "smbios.h" vm_offset_t memtop, memtop_copyin, high_heap_base; uint32_t bios_basemem, bios_extmem, high_heap_size; static struct bios_smap_xattr smap; /* * Used to track which method was used to set BIOS memory * regions. */ static uint8_t b_bios_probed; #define B_BASEMEM_E820 0x1 #define B_BASEMEM_12 0x2 #define B_EXTMEM_E820 0x4 #define B_EXTMEM_E801 0x8 #define B_EXTMEM_8800 0x10 /* * The minimum amount of memory to reserve in bios_extmem for the heap. */ #define HEAP_MIN (3 * 1024 * 1024) /* * Products in this list need quirks to detect * memory correctly. You need both maker and product as * reported by smbios. */ #define BQ_DISTRUST_E820_EXTMEM 0x1 /* e820 might not return useful extended memory */ struct bios_getmem_quirks { const char* bios_vendor; const char* maker; const char* product; int quirk; }; static struct bios_getmem_quirks quirks[] = { {"coreboot", "Acer", "Peppy", BQ_DISTRUST_E820_EXTMEM}, {NULL, NULL, NULL, 0} }; static int bios_getquirks(void) { int i; for (i=0; quirks[i].quirk != 0; ++i) if (smbios_match(quirks[i].bios_vendor, quirks[i].maker, quirks[i].product)) return (quirks[i].quirk); return (0); } void bios_getmem(void) { uint64_t size; /* Parse system memory map */ v86.ebx = 0; do { v86.ctl = V86_FLAGS; v86.addr = 0x15; /* int 0x15 function 0xe820*/ v86.eax = 0xe820; v86.ecx = sizeof(struct bios_smap_xattr); v86.edx = SMAP_SIG; v86.es = VTOPSEG(&smap); v86.edi = VTOPOFF(&smap); v86int(); if ((V86_CY(v86.efl)) || (v86.eax != SMAP_SIG)) break; /* look for a low-memory segment that's large enough */ if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) && (smap.length >= (512 * 1024))) { bios_basemem = smap.length; b_bios_probed |= B_BASEMEM_E820; } /* look for the first segment in 'extended' memory */ if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000) && !(bios_getquirks() & BQ_DISTRUST_E820_EXTMEM)) { bios_extmem = smap.length; b_bios_probed |= B_EXTMEM_E820; } /* * Look for the largest segment in 'extended' memory beyond * 1MB but below 4GB. */ if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) && (smap.base < 0x100000000ull)) { size = smap.length; /* * If this segment crosses the 4GB boundary, truncate it. */ if (smap.base + size > 0x100000000ull) size = 0x100000000ull - smap.base; if (size > high_heap_size) { high_heap_size = size; high_heap_base = smap.base; } } } while (v86.ebx != 0); /* Fall back to the old compatibility function for base memory */ if (bios_basemem == 0) { v86.ctl = 0; v86.addr = 0x12; /* int 0x12 */ v86int(); bios_basemem = (v86.eax & 0xffff) * 1024; b_bios_probed |= B_BASEMEM_12; } /* Fall back through several compatibility functions for extended memory */ if (bios_extmem == 0) { v86.ctl = V86_FLAGS; v86.addr = 0x15; /* int 0x15 function 0xe801*/ v86.eax = 0xe801; v86int(); if (!(V86_CY(v86.efl))) { /* * Clear high_heap; it may end up overlapping * with the segment we're determining here. * Let the default "steal stuff from top of * bios_extmem" code below pick up on it. */ high_heap_size = 0; high_heap_base = 0; /* * %cx is the number of 1KiB blocks between 1..16MiB. * It can only be up to 0x3c00; if it's smaller then * there's a PC AT memory hole so we can't treat * it as contiguous. */ bios_extmem = (v86.ecx & 0xffff) * 1024; if (bios_extmem == (1024 * 0x3c00)) bios_extmem += (v86.edx & 0xffff) * 64 * 1024; /* truncate bios_extmem */ if (bios_extmem > 0x3ff00000) bios_extmem = 0x3ff00000; b_bios_probed |= B_EXTMEM_E801; } } if (bios_extmem == 0) { v86.ctl = 0; v86.addr = 0x15; /* int 0x15 function 0x88*/ v86.eax = 0x8800; v86int(); bios_extmem = (v86.eax & 0xffff) * 1024; b_bios_probed |= B_EXTMEM_8800; } /* Set memtop to actual top of memory */ memtop = memtop_copyin = 0x100000 + bios_extmem; /* * If we have extended memory and did not find a suitable heap * region in the SMAP, use the last 3MB of 'extended' memory as a * high heap candidate. */ if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) { high_heap_size = HEAP_MIN; high_heap_base = memtop - HEAP_MIN; } } static int command_biosmem(int argc, char *argv[]) { int bq = bios_getquirks(); printf("bios_basemem: 0x%llx\n", (unsigned long long) bios_basemem); printf("bios_extmem: 0x%llx\n", (unsigned long long) bios_extmem); printf("memtop: 0x%llx\n", (unsigned long long) memtop); printf("high_heap_base: 0x%llx\n", (unsigned long long) high_heap_base); printf("high_heap_size: 0x%llx\n", (unsigned long long) high_heap_size); printf("bios_quirks: 0x%02x", bq); if (bq & BQ_DISTRUST_E820_EXTMEM) printf(" BQ_DISTRUST_E820_EXTMEM"); printf("\n"); printf("b_bios_probed: 0x%02x", (int) b_bios_probed); if (b_bios_probed & B_BASEMEM_E820) printf(" B_BASEMEM_E820"); if (b_bios_probed & B_BASEMEM_12) printf(" B_BASEMEM_12"); if (b_bios_probed & B_EXTMEM_E820) printf(" B_EXTMEM_E820"); if (b_bios_probed & B_EXTMEM_E801) printf(" B_EXTMEM_E801"); if (b_bios_probed & B_EXTMEM_8800) printf(" B_EXTMEM_8800"); printf("\n"); return (CMD_OK); } COMMAND_SET(biosmem, "biosmem", "show BIOS memory setup", command_biosmem);