/* * This file is part of the coreboot project. * * Copyright (C) 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA */ #include <types.h> #include <string.h> #include <bootmem.h> #include <bootstate.h> #include <cbmem.h> #include <console/console.h> #include <console/cbmem_console.h> #include <arch/early_variables.h> #if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__) #include <arch/acpi.h> #endif // The CBMEM TOC reserves 512 bytes to keep // the other entries somewhat aligned. // Increase if MAX_CBMEM_ENTRIES exceeds 21 #define CBMEM_TOC_RESERVED 512 #define MAX_CBMEM_ENTRIES 16 #define CBMEM_MAGIC 0x434f5245 struct cbmem_entry { u32 magic; u32 id; u64 base; u64 size; } __attribute__((packed)); #ifndef __PRE_RAM__ static uint64_t cbmem_base = 0; static uint64_t cbmem_size = 0; #endif static void cbmem_trace_location(uint64_t base, uint64_t size, const char *s) { if (base && size && s) { printk(BIOS_DEBUG, "CBMEM region %llx-%llx (%s)\n", base, base + size - 1, s); } } static void cbmem_locate_table(uint64_t *base, uint64_t *size) { #ifdef __PRE_RAM__ get_cbmem_table(base, size); #else if (!(cbmem_base && cbmem_size)) { get_cbmem_table(&cbmem_base, &cbmem_size); cbmem_trace_location(cbmem_base, cbmem_size, __FUNCTION__); } *base = cbmem_base; *size = cbmem_size; #endif } struct cbmem_entry *get_cbmem_toc(void) { uint64_t base, size; cbmem_locate_table(&base, &size); return (struct cbmem_entry *)(unsigned long)base; } #if !defined(__PRE_RAM__) void cbmem_late_set_table(uint64_t base, uint64_t size) { cbmem_trace_location(base, size, __FUNCTION__); cbmem_base = base; cbmem_size = size; } #endif /** * cbmem is a simple mechanism to do some kind of book keeping of the coreboot * high tables memory. This is a small amount of memory which is "stolen" from * the system memory for coreboot purposes. Usually this memory is used for * - the coreboot table * - legacy tables (PIRQ, MP table) * - ACPI tables * - suspend/resume backup memory */ static void cbmem_initialize_empty(void) { uint64_t baseaddr, size; struct cbmem_entry *cbmem_toc; cbmem_locate_table(&baseaddr, &size); cbmem_trace_location(baseaddr, size, __FUNCTION__); if (!(baseaddr && size)) { printk(BIOS_CRIT, "Unable to set location for CBMEM.\n"); return; } cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr; memset(cbmem_toc, 0, CBMEM_TOC_RESERVED); cbmem_toc[0] = (struct cbmem_entry) { .magic = CBMEM_MAGIC, .id = CBMEM_ID_FREESPACE, .base = baseaddr + CBMEM_TOC_RESERVED, .size = size - CBMEM_TOC_RESERVED }; } static int cbmem_check_toc(void) { uint64_t baseaddr, size; struct cbmem_entry *cbmem_toc; cbmem_locate_table(&baseaddr, &size); cbmem_trace_location(baseaddr, size, __FUNCTION__); cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr; return (cbmem_toc[0].magic == CBMEM_MAGIC); } void *cbmem_add(u32 id, u64 size) { struct cbmem_entry *cbmem_toc; int i; void *p; /* * This could be a restart, check if the section is there already. It * is remotely possible that the dram contents persisted over the * bootloader upgrade AND the same section now needs more room, but * this is quite a remote possibility and it is ignored here. */ p = cbmem_find(id); if (p) { printk(BIOS_NOTICE, "CBMEM section %x: using existing location at %p.\n", id, p); return p; } cbmem_toc = get_cbmem_toc(); if (cbmem_toc == NULL) { return NULL; } if (cbmem_toc[0].magic != CBMEM_MAGIC) { printk(BIOS_ERR, "ERROR: CBMEM was not initialized yet.\n"); return NULL; } /* Will the entry fit at all? */ if (size > cbmem_toc[0].size) { printk(BIOS_ERR, "ERROR: Not enough memory for table %x\n", id); return NULL; } /* Align size to 512 byte blocks */ size = ALIGN(size, 512) < cbmem_toc[0].size ? ALIGN(size, 512) : cbmem_toc[0].size; /* Now look for the first free/usable TOC entry */ for (i = 0; i < MAX_CBMEM_ENTRIES; i++) { if (cbmem_toc[i].id == CBMEM_ID_NONE) break; } if (i >= MAX_CBMEM_ENTRIES) { printk(BIOS_ERR, "ERROR: No more CBMEM entries available.\n"); return NULL; } printk(BIOS_DEBUG, "Adding CBMEM entry as no. %d\n", i); cbmem_toc[i] = (struct cbmem_entry) { .magic = CBMEM_MAGIC, .id = id, .base = cbmem_toc[0].base, .size = size }; cbmem_toc[0].base += size; cbmem_toc[0].size -= size; return (void *)(uintptr_t)cbmem_toc[i].base; } void *cbmem_find(u32 id) { struct cbmem_entry *cbmem_toc; int i; cbmem_toc = get_cbmem_toc(); if (cbmem_toc == NULL) return NULL; for (i = 0; i < MAX_CBMEM_ENTRIES; i++) { if (cbmem_toc[i].id == id) return (void *)(unsigned long)cbmem_toc[i].base; } return (void *)NULL; } /* Returns True if it was not initialized before. */ int cbmem_recovery(int is_wakeup) { int found = cbmem_check_toc(); int wipe = 0; /* CBMEM TOC is wiped clean when we are not waking up from S3 * suspend. Boards with EARLY_CBMEM_INIT do this in romstage, * boards without EARLY_CBMEM_INIT do this in ramstage. */ #if defined(__PRE_RAM__) && CONFIG_EARLY_CBMEM_INIT wipe = 1; #endif #if !defined(__PRE_RAM__) && !CONFIG_EARLY_CBMEM_INIT wipe = 1; #endif if (!is_wakeup && wipe) cbmem_initialize_empty(); if (is_wakeup && !found) { cbmem_initialize_empty(); cbmem_fail_resume(); } cbmem_arch_init(); car_migrate_variables(); return !found; } #ifndef __PRE_RAM__ static void init_cbmem_post_device(void *unused) { #if CONFIG_HAVE_ACPI_RESUME cbmem_recovery(acpi_is_wakeup()); #else cbmem_recovery(0); #endif #if CONFIG_CONSOLE_CBMEM cbmemc_reinit(); #endif } BOOT_STATE_INIT_ENTRIES(cbmem_bscb) = { BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_ENTRY, init_cbmem_post_device, NULL), }; void cbmem_add_bootmem(void) { bootmem_add_range(cbmem_base, cbmem_size, LB_MEM_TABLE); } void cbmem_list(void) { struct cbmem_entry *cbmem_toc; int i; cbmem_toc = get_cbmem_toc(); if (cbmem_toc == NULL) return; for (i = 0; i < MAX_CBMEM_ENTRIES; i++) { if (cbmem_toc[i].magic != CBMEM_MAGIC) continue; cbmem_print_entry(i, cbmem_toc[i].id, cbmem_toc[i].base, cbmem_toc[i].size); } } #endif