/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2006 IronPort Systems Inc. * 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 #include #include #include #include #include #include #include #include #include #include #if defined(__amd64__) || defined(__i386__) #include #endif #include #ifdef LOCAL_MODULE #include #include #else #include #include #endif struct ipmi_entry { uint8_t type; uint8_t length; uint16_t handle; uint8_t interface_type; uint8_t spec_revision; uint8_t i2c_slave_address; uint8_t NV_storage_device_address; uint64_t base_address; uint8_t base_address_modifier; uint8_t interrupt_number; }; /* Fields in the base_address field of an IPMI entry. */ #define IPMI_BAR_MODE(ba) ((ba) & 0x0000000000000001) #define IPMI_BAR_ADDR(ba) ((ba) & 0xfffffffffffffffe) /* Fields in the base_address_modifier field of an IPMI entry. */ #define IPMI_BAM_IRQ_TRIGGER 0x01 #define IPMI_BAM_IRQ_POLARITY 0x02 #define IPMI_BAM_IRQ_VALID 0x08 #define IPMI_BAM_ADDR_LSB(bam) (((bam) & 0x10) >> 4) #define IPMI_BAM_REG_SPACING(bam) (((bam) & 0xc0) >> 6) #define SPACING_8 0x0 #define SPACING_32 0x1 #define SPACING_16 0x2 static struct ipmi_get_info ipmi_info; static int ipmi_probed; static struct mtx ipmi_info_mtx; MTX_SYSINIT(ipmi_info, &ipmi_info_mtx, "ipmi info", MTX_DEF); static void ipmi_smbios_probe(struct ipmi_get_info *); static int smbios_cksum(struct smbios_eps *); static void smbios_ipmi_info(struct smbios_structure_header *, void *); static void smbios_ipmi_info(struct smbios_structure_header *h, void *arg) { struct ipmi_get_info *info; struct ipmi_entry *s; if (h->type != 38 || h->length < offsetof(struct ipmi_entry, interrupt_number)) return; s = (struct ipmi_entry *)h; info = arg; bzero(info, sizeof(struct ipmi_get_info)); switch (s->interface_type) { case KCS_MODE: case SMIC_MODE: case BT_MODE: info->address = IPMI_BAR_ADDR(s->base_address) | IPMI_BAM_ADDR_LSB(s->base_address_modifier); info->io_mode = IPMI_BAR_MODE(s->base_address); switch (IPMI_BAM_REG_SPACING(s->base_address_modifier)) { case SPACING_8: info->offset = 1; break; case SPACING_32: info->offset = 4; break; case SPACING_16: info->offset = 2; break; default: printf("SMBIOS: Invalid register spacing\n"); return; } break; case SSIF_MODE: if ((s->base_address & 0xffffffffffffff00) != 0) { printf("SMBIOS: Invalid SSIF SMBus address, using BMC I2C slave address instead\n"); info->address = s->i2c_slave_address; break; } info->address = IPMI_BAR_ADDR(s->base_address); break; default: return; } if (s->length > offsetof(struct ipmi_entry, interrupt_number)) { if (s->interrupt_number > 15) printf("SMBIOS: Non-ISA IRQ %d for IPMI\n", s->interrupt_number); else info->irq = s->interrupt_number; } info->iface_type = s->interface_type; } /* * Walk the SMBIOS table looking for an IPMI (type 38) entry. If we find * one, return the parsed data in the passed in ipmi_get_info structure and * return true. If we don't find one, return false. */ static void ipmi_smbios_probe(struct ipmi_get_info *info) { #ifdef ARCH_MAY_USE_EFI struct uuid efi_smbios; void *addr_efi; #endif struct smbios_eps *header; void *table; u_int32_t addr; addr = 0; bzero(info, sizeof(struct ipmi_get_info)); #ifdef ARCH_MAY_USE_EFI efi_smbios = (struct uuid)EFI_TABLE_SMBIOS; if (!efi_get_table(&efi_smbios, &addr_efi)) addr = (vm_paddr_t)addr_efi; #endif if (addr == 0) /* Find the SMBIOS table header. */ addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, SMBIOS_STEP, SMBIOS_OFF); if (addr == 0) return; /* * Map the header. We first map a fixed size to get the actual * length and then map it a second time with the actual length so * we can verify the checksum. */ header = pmap_mapbios(addr, sizeof(struct smbios_eps)); table = pmap_mapbios(addr, header->length); pmap_unmapbios((vm_offset_t)header, sizeof(struct smbios_eps)); header = table; if (smbios_cksum(header) != 0) { pmap_unmapbios((vm_offset_t)header, header->length); return; } /* Now map the actual table and walk it looking for an IPMI entry. */ table = pmap_mapbios(header->structure_table_address, header->structure_table_length); smbios_walk_table(table, header->number_structures, smbios_ipmi_info, info); /* Unmap everything. */ pmap_unmapbios((vm_offset_t)table, header->structure_table_length); pmap_unmapbios((vm_offset_t)header, header->length); } /* * Return the SMBIOS IPMI table entry info to the caller. If we haven't * searched the IPMI table yet, search it. Otherwise, return a cached * copy of the data. */ int ipmi_smbios_identify(struct ipmi_get_info *info) { mtx_lock(&ipmi_info_mtx); switch (ipmi_probed) { case 0: /* Need to probe the SMBIOS table. */ ipmi_probed++; mtx_unlock(&ipmi_info_mtx); ipmi_smbios_probe(&ipmi_info); mtx_lock(&ipmi_info_mtx); ipmi_probed++; wakeup(&ipmi_info); break; case 1: /* Another thread is currently probing the table, so wait. */ while (ipmi_probed == 1) msleep(&ipmi_info, &ipmi_info_mtx, 0, "ipmi info", 0); break; default: /* The cached data is available. */ break; } bcopy(&ipmi_info, info, sizeof(ipmi_info)); mtx_unlock(&ipmi_info_mtx); return (info->iface_type != 0); } static int smbios_cksum(struct smbios_eps *e) { u_int8_t *ptr; u_int8_t cksum; int i; ptr = (u_int8_t *)e; cksum = 0; for (i = 0; i < e->length; i++) { cksum += ptr[i]; } return (cksum); }