/* * This file is part of the coreboot project. * * Copyright (C) 2003 Eric Biederman * Copyright (C) 2005 Steve Magnani * Copyright (C) 2008-2009 coresystems GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include static unsigned long write_pirq_table(unsigned long rom_table_end) { unsigned long high_table_pointer; #define MAX_PIRQ_TABLE_SIZE (4 * 1024) post_code(0x9a); /* This table must be between 0x0f0000 and 0x100000 */ rom_table_end = write_pirq_routing_table(rom_table_end); rom_table_end = ALIGN(rom_table_end, 1024); /* And add a high table version for those payloads that * want to live in the F segment */ high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_PIRQ, MAX_PIRQ_TABLE_SIZE); if (high_table_pointer) { unsigned long new_high_table_pointer; new_high_table_pointer = write_pirq_routing_table(high_table_pointer); // FIXME make pirq table code intelligent enough to know how // much space it's going to need. if (new_high_table_pointer > (high_table_pointer + MAX_PIRQ_TABLE_SIZE)) printk(BIOS_ERR, "ERROR: Increase PIRQ size.\n"); printk(BIOS_DEBUG, "PIRQ table: %ld bytes.\n", new_high_table_pointer - high_table_pointer); } return rom_table_end; } static unsigned long write_mptable(unsigned long rom_table_end) { unsigned long high_table_pointer; #define MAX_MP_TABLE_SIZE (4 * 1024) post_code(0x9b); /* The smp table must be in 0-1K, 639K-640K, or 960K-1M */ rom_table_end = write_smp_table(rom_table_end); rom_table_end = ALIGN(rom_table_end, 1024); high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_MPTABLE, MAX_MP_TABLE_SIZE); if (high_table_pointer) { unsigned long new_high_table_pointer; new_high_table_pointer = write_smp_table(high_table_pointer); // FIXME make mp table code intelligent enough to know how // much space it's going to need. if (new_high_table_pointer > (high_table_pointer + MAX_MP_TABLE_SIZE)) printk(BIOS_ERR, "ERROR: Increase MP table size.\n"); printk(BIOS_DEBUG, "MP table: %ld bytes.\n", new_high_table_pointer - high_table_pointer); } return rom_table_end; } static unsigned long write_acpi_table(unsigned long rom_table_end) { unsigned long high_table_pointer; #define MAX_ACPI_SIZE (144 * 1024) post_code(0x9c); /* Write ACPI tables to F segment and high tables area */ /* Ok, this is a bit hacky still, because some day we want to have this * completely dynamic. But right now we are setting fixed sizes. * It's probably still better than the old high_table_base code because * now at least we know when we have an overflow in the area. * * We want to use 1MB - 64K for Resume backup. We use 512B for TOC and * 512 byte for GDT, 4K for PIRQ and 4K for MP table and 8KB for the * coreboot table. This leaves us with 47KB for all of ACPI. Let's see * how far we get. */ high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_ACPI, MAX_ACPI_SIZE); if (high_table_pointer) { unsigned long acpi_start = high_table_pointer; unsigned long new_high_table_pointer; rom_table_end = ALIGN(rom_table_end, 16); new_high_table_pointer = write_acpi_tables(high_table_pointer); if (new_high_table_pointer > (high_table_pointer + MAX_ACPI_SIZE)) printk(BIOS_ERR, "ERROR: Increase ACPI size\n"); printk(BIOS_DEBUG, "ACPI tables: %ld bytes.\n", new_high_table_pointer - high_table_pointer); /* Now we need to create a low table copy of the RSDP. */ /* First we look for the high table RSDP */ while (acpi_start < new_high_table_pointer) { if (memcmp(((acpi_rsdp_t *)acpi_start)->signature, RSDP_SIG, 8) == 0) break; acpi_start++; } /* Now, if we found the RSDP, we take the RSDT and XSDT pointer * from it in order to write the low RSDP */ if (acpi_start < new_high_table_pointer) { acpi_rsdp_t *low_rsdp = (acpi_rsdp_t *)rom_table_end, *high_rsdp = (acpi_rsdp_t *)acpi_start; /* Technically rsdp length varies but coreboot always writes longest size available. */ memcpy(low_rsdp, high_rsdp, sizeof(acpi_rsdp_t)); } else { printk(BIOS_ERR, "ERROR: Didn't find RSDP in high table.\n"); } rom_table_end = ALIGN(rom_table_end + sizeof(acpi_rsdp_t), 16); } else { rom_table_end = write_acpi_tables(rom_table_end); rom_table_end = ALIGN(rom_table_end, 1024); } return rom_table_end; } static unsigned long write_smbios_table(unsigned long rom_table_end) { unsigned long high_table_pointer; #define MAX_SMBIOS_SIZE 2048 high_table_pointer = (unsigned long)cbmem_add(CBMEM_ID_SMBIOS, MAX_SMBIOS_SIZE); if (high_table_pointer) { unsigned long new_high_table_pointer; new_high_table_pointer = smbios_write_tables(high_table_pointer); rom_table_end = ALIGN(rom_table_end, 16); memcpy((void *)rom_table_end, (void *)high_table_pointer, sizeof(struct smbios_entry)); rom_table_end += sizeof(struct smbios_entry); if (new_high_table_pointer > (high_table_pointer + MAX_SMBIOS_SIZE)) printk(BIOS_ERR, "ERROR: Increase SMBIOS size\n"); printk(BIOS_DEBUG, "SMBIOS tables: %ld bytes.\n", new_high_table_pointer - high_table_pointer); } else { unsigned long new_rom_table_end; new_rom_table_end = smbios_write_tables(rom_table_end); printk(BIOS_DEBUG, "SMBIOS size %ld bytes\n", new_rom_table_end - rom_table_end); rom_table_end = ALIGN(new_rom_table_end, 16); } return rom_table_end; } /* Start forwarding table at 0x500, so we don't run into conflicts with the BDA * in case our data structures grow beyond 0x400. Only GDT * and the coreboot table use low_tables. */ #define FORWARDING_TABLE_ADDR ((uintptr_t)0x500) static uintptr_t forwarding_table = FORWARDING_TABLE_ADDR; /* * For EARLY_EBDA_INIT the BDA area will be wiped on the resume path which * has the forwarding table entry. Therefore, when tables are written an * entry is placed in cbmem that can be restored on OS resume to the proper * location. */ static void stash_forwarding_table(uintptr_t addr, size_t sz) { void *cbmem_addr = cbmem_add(CBMEM_ID_CBTABLE_FWD, sz); if (cbmem_addr == NULL) { printk(BIOS_ERR, "Unable to allocate CBMEM forwarding entry.\n"); return; } memcpy(cbmem_addr, (void *)addr, sz); } static void restore_forwarding_table(void *dest) { const struct cbmem_entry *fwd_entry; fwd_entry = cbmem_entry_find(CBMEM_ID_CBTABLE_FWD); if (fwd_entry == NULL) { printk(BIOS_ERR, "Unable to restore CBMEM forwarding entry.\n"); return; } memcpy(dest, cbmem_entry_start(fwd_entry), cbmem_entry_size(fwd_entry)); } BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, restore_forwarding_table, (void *)FORWARDING_TABLE_ADDR); void arch_write_tables(uintptr_t coreboot_table) { size_t sz; unsigned long rom_table_end = 0xf0000; /* This table must be between 0x0f0000 and 0x100000 */ if (IS_ENABLED(CONFIG_GENERATE_PIRQ_TABLE)) rom_table_end = write_pirq_table(rom_table_end); /* The smp table must be in 0-1K, 639K-640K, or 960K-1M */ if (IS_ENABLED(CONFIG_GENERATE_MP_TABLE)) rom_table_end = write_mptable(rom_table_end); if (IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)) rom_table_end = write_acpi_table(rom_table_end); if (IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)) rom_table_end = write_smbios_table(rom_table_end); sz = write_coreboot_forwarding_table(forwarding_table, coreboot_table); stash_forwarding_table(forwarding_table, sz); forwarding_table += sz; /* Align up to page boundary for historical consistency. */ forwarding_table = ALIGN_UP(forwarding_table, 4*KiB); /* Tell static analysis we know value is left unused. */ (void)rom_table_end; } void bootmem_arch_add_ranges(void) { /* Memory from 0 through the forwarding_table is reserved. */ const uintptr_t base = 0; bootmem_add_range(base, forwarding_table - base, BM_MEM_TABLE); }