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Diffstat (limited to 'src/lib/bootmem.c')
| -rw-r--r-- | src/lib/bootmem.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/lib/bootmem.c b/src/lib/bootmem.c new file mode 100644 index 0000000000..f1bd7cc127 --- /dev/null +++ b/src/lib/bootmem.c @@ -0,0 +1,177 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2003-2004 Eric Biederman + * Copyright (C) 2005-2010 coresystems GmbH + * Copyright (C) 2014 Google Inc. + * + * 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 <console/console.h> +#include <bootmem.h> +#include <cbmem.h> +#include <device/resource.h> +#include <stdlib.h> + +static struct memranges bootmem; + +void bootmem_init(void) +{ + const unsigned long cacheable = IORESOURCE_CACHEABLE; + const unsigned long reserved = IORESOURCE_RESERVE; + struct memranges *bm = &bootmem; + + /* + * Fill the memory map out. The order of operations is important in + * that each overlapping range will take over the next. Therefore, + * add cacheable resources as RAM then add the reserved resources. + */ + memranges_init(bm, cacheable, cacheable, LB_MEM_RAM); + memranges_add_resources(bm, reserved, reserved, LB_MEM_RESERVED); + + /* Add memory used by CBMEM. */ + cbmem_add_bootmem(); +} + +void bootmem_add_range(uint64_t start, uint64_t size, uint32_t type) +{ + memranges_insert(&bootmem, start, size, type); +} + +void bootmem_write_memory_table(struct lb_memory *mem) +{ + const struct range_entry *r; + struct lb_memory_range *lb_r; + + lb_r = &mem->map[0]; + + bootmem_dump_ranges(); + + memranges_each_entry(r, &bootmem) { + lb_r->start = pack_lb64(range_entry_base(r)); + lb_r->size = pack_lb64(range_entry_size(r)); + lb_r->type = range_entry_tag(r); + + lb_r++; + mem->size += sizeof(struct lb_memory_range); + } +} + +struct range_strings { + unsigned long tag; + const char *str; +}; + +static const struct range_strings type_strings[] = { + { LB_MEM_RAM, "RAM" }, + { LB_MEM_RESERVED, "RESERVED" }, + { LB_MEM_ACPI, "ACPI" }, + { LB_MEM_NVS, "NVS" }, + { LB_MEM_UNUSABLE, "UNUSABLE" }, + { LB_MEM_VENDOR_RSVD, "VENDOR RESERVED" }, + { LB_MEM_TABLE, "CONFIGURATION TABLES" }, +}; + +static const char *bootmem_range_string(unsigned long tag) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(type_strings); i++) { + if (type_strings[i].tag == tag) + return type_strings[i].str; + } + + return "UNKNOWN!"; +} + +void bootmem_dump_ranges(void) +{ + int i; + const struct range_entry *r; + + i = 0; + memranges_each_entry(r, &bootmem) { + printk(BIOS_DEBUG, "%2d. %016llx-%016llx: %s\n", + i, range_entry_base(r), range_entry_end(r) - 1, + bootmem_range_string(range_entry_tag(r))); + i++; + } +} + +int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size) +{ + const struct range_entry *r; + uint64_t end = start + size; + + memranges_each_entry(r, &bootmem) { + /* All further bootmem entries are beyond this range. */ + if (end <= range_entry_base(r)) + break; + + if (start >= range_entry_base(r) && end <= range_entry_end(r)) { + if (range_entry_tag(r) == LB_MEM_RAM) + return 1; + } + } + return 0; +} + +void *bootmem_allocate_buffer(size_t size) +{ + const struct range_entry *r; + const struct range_entry *region; + /* All allocated buffers fall below the 32-bit boundary. */ + const resource_t max_addr = 1ULL << 32; + resource_t begin; + resource_t end; + + /* 4KiB alignment. */ + size = ALIGN(size, 4096); + region = NULL; + memranges_each_entry(r, &bootmem) { + if (range_entry_size(r) < size) + continue; + + if (range_entry_tag(r) != LB_MEM_RAM) + continue; + + if (range_entry_base(r) >= max_addr) + continue; + + end = range_entry_end(r); + if (end > max_addr) + end = max_addr; + + if ((end - range_entry_base(r)) < size) + continue; + + region = r; + } + + if (region == NULL) + return NULL; + + /* region now points to the highest usable region for the given size. */ + begin = range_entry_base(region); + end = range_entry_end(region); + if (end > max_addr) + end = max_addr; + begin = end - size; + + /* Mark buffer as unusuable for future buffer use. */ + bootmem_add_range(begin, size, LB_MEM_UNUSABLE); + + return (void *)(uintptr_t)begin; +} |