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-rw-r--r--util/cbmem/cbmem.c512
1 files changed, 285 insertions, 227 deletions
diff --git a/util/cbmem/cbmem.c b/util/cbmem/cbmem.c
index ef8bfb5036..b4f41d2072 100644
--- a/util/cbmem/cbmem.c
+++ b/util/cbmem/cbmem.c
@@ -42,13 +42,23 @@
#endif
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
-#define MAP_BYTES (1024*1024)
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
+/* Return < 0 on error, 0 on success. */
+static int parse_cbtable(u64 address, size_t table_size);
+
+struct mapping {
+ void *virt;
+ size_t offset;
+ size_t virt_size;
+ unsigned long long phys;
+ size_t size;
+};
+
#define CBMEM_VERSION "1.1"
/* verbose output? */
@@ -57,9 +67,105 @@ static int verbose = 0;
/* File handle used to access /dev/mem */
static int mem_fd;
+static struct mapping lbtable_mapping;
+
+static void die(const char *msg)
+{
+ if (msg)
+ fputs(msg, stderr);
+ exit(1);
+}
+
+static unsigned long long system_page_size(void)
+{
+ static unsigned long long page_size;
+
+ if (!page_size)
+ page_size = getpagesize();
+
+ return page_size;
+}
+
+static inline size_t size_to_mib(size_t sz)
+{
+ return sz >> 20;
+}
-static uint64_t lbtable_address;
-static size_t lbtable_size;
+/* Return mapping of physical address requested. */
+static const void *mapping_virt(const struct mapping *mapping)
+{
+ const char *v = mapping->virt;
+
+ if (v == NULL)
+ return NULL;
+
+ return v + mapping->offset;
+}
+
+/* Returns 0 on success, < 0 on error. mapping is filled in. */
+static const void *map_memory(struct mapping *mapping, unsigned long long phys,
+ size_t sz)
+{
+ void *v;
+ unsigned long long page_size;
+
+ page_size = system_page_size();
+
+ mapping->virt = NULL;
+ mapping->offset = phys % page_size;
+ mapping->virt_size = sz + mapping->offset;
+ mapping->size = sz;
+ mapping->phys = phys;
+
+ if (size_to_mib(mapping->virt_size) == 0) {
+ debug("Mapping %zuB of physical memory at 0x%llx (requested 0x%llx).\n",
+ mapping->virt_size, phys - mapping->offset, phys);
+ } else {
+ debug("Mapping %zuMB of physical memory at 0x%llx (requested 0x%llx).\n",
+ size_to_mib(mapping->virt_size), phys - mapping->offset,
+ phys);
+ }
+
+ v = mmap(NULL, mapping->virt_size, PROT_READ, MAP_SHARED, mem_fd,
+ phys - mapping->offset);
+
+ if (v == MAP_FAILED) {
+ debug("Mapping failed %zuB of physical memory at 0x%llx.\n",
+ mapping->virt_size, phys - mapping->offset);
+ return NULL;
+ }
+
+ mapping->virt = v;
+
+ if (mapping->offset != 0)
+ debug(" ... padding virtual address with 0x%zx bytes.\n",
+ mapping->offset);
+
+ return mapping_virt(mapping);
+}
+
+/* Returns 0 on success, < 0 on error. mapping is cleared if successful. */
+static int unmap_memory(struct mapping *mapping)
+{
+ if (mapping->virt == NULL)
+ return -1;
+
+ munmap(mapping->virt, mapping->virt_size);
+ mapping->virt = NULL;
+ mapping->offset = 0;
+ mapping->virt_size = 0;
+
+ return 0;
+}
+
+/* Return size of physical address mapping requested. */
+static size_t mapping_size(const struct mapping *mapping)
+{
+ if (mapping->virt == NULL)
+ return 0;
+
+ return mapping->size;
+}
/*
* Some architectures map /dev/mem memory in a way that doesn't support
@@ -110,115 +216,6 @@ static u16 ipchcksum(const void *addr, unsigned size)
return (u16) sum;
}
-/*
- * Functions to map / unmap physical memory into virtual address space. These
- * functions always maps 1MB at a time and can only map one area at once.
- */
-static const void *mapped_virtual;
-static size_t mapped_size;
-
-static inline size_t size_to_mib(size_t sz)
-{
- return sz >> 20;
-}
-
-static void unmap_memory(void)
-{
- if (mapped_virtual == NULL) {
- fprintf(stderr, "Error unmapping memory\n");
- return;
- }
- if (size_to_mib(mapped_size) == 0) {
- debug("Unmapping %zuMB of virtual memory at %p.\n",
- size_to_mib(mapped_size), mapped_virtual);
- } else {
- debug("Unmapping %zuMB of virtual memory at %p.\n",
- size_to_mib(mapped_size), mapped_virtual);
- }
- munmap((void *)mapped_virtual, mapped_size);
- mapped_virtual = NULL;
- mapped_size = 0;
-}
-
-static const void *map_memory_size(u64 physical, size_t size,
- uint8_t abort_on_failure)
-{
- const void *v;
- off_t p;
- u64 page = getpagesize();
- size_t padding;
-
- if (mapped_virtual != NULL)
- unmap_memory();
-
- /* Mapped memory must be aligned to page size */
- p = physical & ~(page - 1);
- padding = physical & (page-1);
- size += padding;
-
- if (size_to_mib(size) == 0) {
- debug("Mapping %zuB of physical memory at 0x%jx (requested 0x%jx).\n",
- size, (intmax_t)p, (intmax_t)physical);
- } else {
- debug("Mapping %zuMB of physical memory at 0x%jx (requested 0x%jx).\n",
- size_to_mib(size), (intmax_t)p, (intmax_t)physical);
- }
-
- v = mmap(NULL, size, PROT_READ, MAP_SHARED, mem_fd, p);
-
- /* Only try growing down when address exceeds page size so that
- one doesn't underflow the offset request. */
- if (v == MAP_FAILED && p >= page) {
- /* The mapped area may have overrun the upper cbmem boundary when trying to
- * align to the page size. Try growing down instead of up...
- */
- p -= page;
- padding += page;
- size &= ~(page - 1);
- size = size + (page - 1);
- v = mmap(NULL, size, PROT_READ, MAP_SHARED, mem_fd, p);
- debug(" ... failed. Mapping %zuB of physical memory at 0x%jx.\n",
- size, (intmax_t)p);
- }
-
- if (v == MAP_FAILED) {
- if (abort_on_failure) {
- fprintf(stderr, "Failed to mmap /dev/mem: %s\n",
- strerror(errno));
- exit(1);
- } else {
- return 0;
- }
- }
-
- /* Remember what we actually mapped ... */
- mapped_virtual = v;
- mapped_size = size;
-
- /* ... but return address to the physical memory that was requested */
- if (padding)
- debug(" ... padding virtual address with 0x%zx bytes.\n",
- padding);
- v += padding;
-
- return v;
-}
-
-static const void *map_lbtable(void)
-{
- if (lbtable_address == 0 || lbtable_size == 0) {
- fprintf(stderr, "No coreboot table area found!\n");
- return NULL;
- }
-
- return map_memory_size(lbtable_address, lbtable_size, 1);
-}
-
-static void unmap_lbtable(void)
-{
- unmap_memory();
-}
-
/* Find the first cbmem entry filling in the details. */
static int find_cbmem_entry(uint32_t id, uint64_t *addr, size_t *size)
{
@@ -226,14 +223,14 @@ static int find_cbmem_entry(uint32_t id, uint64_t *addr, size_t *size)
size_t offset;
int ret = -1;
- table = map_lbtable();
+ table = mapping_virt(&lbtable_mapping);
if (table == NULL)
return -1;
offset = 0;
- while (offset < lbtable_size) {
+ while (offset < mapping_size(&lbtable_mapping)) {
const struct lb_record *lbr;
const struct lb_cbmem_entry *lbe;
@@ -253,7 +250,6 @@ static int find_cbmem_entry(uint32_t id, uint64_t *addr, size_t *size)
break;
}
- unmap_lbtable();
return ret;
}
@@ -291,107 +287,154 @@ static struct lb_cbmem_ref parse_cbmem_ref(const struct lb_cbmem_ref *cbmem_ref)
return ret;
}
-static int parse_cbtable(u64 address, size_t table_size, uint8_t abort_on_failure)
+static void parse_memory_tags(const struct lb_memory *mem)
+{
+ int num_entries;
+ int i;
+
+ /* Peel off the header size and calculate the number of entries. */
+ num_entries = (mem->size - sizeof(*mem)) / sizeof(mem->map[0]);
+
+ for (i = 0; i < num_entries; i++) {
+ if (mem->map[i].type != LB_MEM_TABLE)
+ continue;
+ debug(" LB_MEM_TABLE found.\n");
+ /* The last one found is CBMEM */
+ cbmem = mem->map[i];
+ }
+}
+
+/* Return < 0 on error, 0 on success, 1 if forwarding table entry found. */
+static int parse_cbtable_entries(const struct mapping *table_mapping)
+{
+ size_t i;
+ const struct lb_record* lbr_p;
+ size_t table_size = mapping_size(table_mapping);
+ const void *lbtable = mapping_virt(table_mapping);
+ int forwarding_table_found = 0;
+
+ for (i = 0; i < table_size; i += lbr_p->size) {
+ lbr_p = lbtable + i;
+ debug(" coreboot table entry 0x%02x\n", lbr_p->tag);
+ switch (lbr_p->tag) {
+ case LB_TAG_MEMORY:
+ debug(" Found memory map.\n");
+ parse_memory_tags(lbtable + i);
+ continue;
+ case LB_TAG_TIMESTAMPS: {
+ debug(" Found timestamp table.\n");
+ timestamps = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p);
+ continue;
+ }
+ case LB_TAG_CBMEM_CONSOLE: {
+ debug(" Found cbmem console.\n");
+ console = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p);
+ continue;
+ }
+ case LB_TAG_FORWARD: {
+ int ret;
+ /*
+ * This is a forwarding entry - repeat the
+ * search at the new address.
+ */
+ struct lb_forward lbf_p =
+ *(const struct lb_forward *) lbr_p;
+ debug(" Found forwarding entry.\n");
+ ret = parse_cbtable(lbf_p.forward, 0);
+
+ /* Assume the forwarding entry is valid. If this fails
+ * then there's a total failure. */
+ if (ret < 0)
+ return -1;
+ forwarding_table_found = 1;
+ }
+ default:
+ break;
+ }
+ }
+
+ return forwarding_table_found;
+}
+
+/* Return < 0 on error, 0 on success. */
+static int parse_cbtable(u64 address, size_t table_size)
{
- int i, found = 0, ret = 0;
const void *buf;
+ struct mapping header_mapping;
+ size_t req_size;
+ size_t i;
+
+ req_size = table_size;
+ /* Default to 4 KiB search space. */
+ if (req_size == 0)
+ req_size = 4 * 1024;
debug("Looking for coreboot table at %" PRIx64 " %zd bytes.\n",
- address, table_size);
- buf = map_memory_size(address, table_size, abort_on_failure);
- if (!buf)
- return -2;
+ address, req_size);
+
+ buf = map_memory(&header_mapping, address, req_size);
- /* look at every 16 bytes within 4K of the base */
+ if (!buf)
+ return -1;
- for (i = 0; i < 0x1000; i += 0x10) {
+ /* look at every 16 bytes */
+ for (i = 0; i < req_size; i += 16) {
+ int ret;
const struct lb_header *lbh;
- const struct lb_record *lbr_p;
- const void *lbtable;
- int j;
+ struct mapping table_mapping;
- lbh = (const struct lb_header *)(buf + i);
+ if (req_size - i < sizeof(struct lb_header))
+ return -1;
+
+ lbh = buf + i;
if (memcmp(lbh->signature, "LBIO", sizeof(lbh->signature)) ||
!lbh->header_bytes ||
ipchcksum(lbh, sizeof(*lbh))) {
continue;
}
- lbtable = buf + i + lbh->header_bytes;
- if (ipchcksum(lbtable, lbh->table_bytes) !=
+ /* Map in the whole table to parse. */
+ if (!map_memory(&table_mapping, address + i + lbh->header_bytes,
+ lbh->table_bytes)) {
+ debug("Couldn't map in table\n");
+ continue;
+ }
+
+ if (ipchcksum(mapping_virt(&table_mapping), lbh->table_bytes) !=
lbh->table_checksum) {
debug("Signature found, but wrong checksum.\n");
+ unmap_memory(&table_mapping);
continue;
}
- found = 1;
debug("Found!\n");
- /* Keep reference to lbtable. */
- lbtable_address = address;
- lbtable_address += ((uint8_t *)lbtable - (uint8_t *)lbh);
- lbtable_size = lbh->table_bytes;
-
- for (j = 0; j < lbh->table_bytes; j += lbr_p->size) {
- lbr_p = (const struct lb_record *)((char *)lbtable + j);
- debug(" coreboot table entry 0x%02x\n", lbr_p->tag);
- switch (lbr_p->tag) {
- case LB_TAG_MEMORY: {
- int i = 0;
- debug(" Found memory map.\n");
- const struct lb_memory *memory =
- (const struct lb_memory *)lbr_p;
- while ((char *)&memory->map[i] < ((char *)lbr_p
- + lbr_p->size)) {
- if (memory->map[i].type == LB_MEM_TABLE) {
- debug(" LB_MEM_TABLE found.\n");
- /* The last one found is CBMEM */
- cbmem = memory->map[i];
- }
- i++;
- }
- continue;
- }
- case LB_TAG_TIMESTAMPS: {
- debug(" Found timestamp table.\n");
- timestamps = parse_cbmem_ref((const struct lb_cbmem_ref *) lbr_p);
- continue;
- }
- case LB_TAG_CBMEM_CONSOLE: {
- debug(" Found cbmem console.\n");
- console = parse_cbmem_ref((const struct lb_cbmem_ref *) lbr_p);
- continue;
- }
- case LB_TAG_FORWARD: {
- /*
- * This is a forwarding entry - repeat the
- * search at the new address.
- */
- const struct lb_forward lbf_p =
- *(const struct lb_forward *) lbr_p;
- debug(" Found forwarding entry.\n");
- unmap_memory();
- ret = parse_cbtable(lbf_p.forward, table_size, 0);
- if (ret == -2) {
- /* try again with a smaller memory mapping request */
- ret = parse_cbtable(lbf_p.forward, table_size / 2, 1);
- if (ret == -2)
- exit(1);
- else
- return ret;
- } else {
- return ret;
- }
- }
- default:
- break;
- }
+ ret = parse_cbtable_entries(&table_mapping);
+ /* Table parsing failed. */
+ if (ret < 0) {
+ unmap_memory(&table_mapping);
+ continue;
}
+
+ /* Succeeded in parsing the table. Header not needed anymore. */
+ unmap_memory(&header_mapping);
+
+ /*
+ * Table parsing succeeded. If forwarding table not found update
+ * coreboot table mapping for future use.
+ */
+ if (ret == 0)
+ lbtable_mapping = table_mapping;
+ else
+ unmap_memory(&table_mapping);
+
+ return 0;
}
- unmap_memory();
- return found;
+ unmap_memory(&header_mapping);
+
+ return -1;
}
#if defined(linux) && (defined(__i386__) || defined(__x86_64__))
@@ -552,6 +595,7 @@ static void dump_timestamps(int mach_readable)
size_t size;
uint64_t prev_stamp;
uint64_t total_time;
+ struct mapping timestamp_mapping;
if (timestamps.tag != LB_TAG_TIMESTAMPS) {
fprintf(stderr, "No timestamps found in coreboot table.\n");
@@ -559,7 +603,9 @@ static void dump_timestamps(int mach_readable)
}
size = sizeof(*tst_p);
- tst_p = map_memory_size((unsigned long)timestamps.cbmem_addr, size, 1);
+ tst_p = map_memory(&timestamp_mapping, timestamps.cbmem_addr, size);
+ if (!tst_p)
+ die("Unable to map timestamp header\n");
timestamp_set_tick_freq(tst_p->tick_freq_mhz);
@@ -567,8 +613,11 @@ static void dump_timestamps(int mach_readable)
printf("%d entries total:\n\n", tst_p->num_entries);
size += tst_p->num_entries * sizeof(tst_p->entries[0]);
- unmap_memory();
- tst_p = map_memory_size((unsigned long)timestamps.cbmem_addr, size, 1);
+ unmap_memory(&timestamp_mapping);
+
+ tst_p = map_memory(&timestamp_mapping, timestamps.cbmem_addr, size);
+ if (!tst_p)
+ die("Unable to map full timestamp table\n");
/* Report the base time within the table. */
prev_stamp = 0;
@@ -602,7 +651,7 @@ static void dump_timestamps(int mach_readable)
printf("\n");
}
- unmap_memory();
+ unmap_memory(&timestamp_mapping);
}
struct cbmem_console {
@@ -620,6 +669,7 @@ static void dump_console(int one_boot_only)
const struct cbmem_console *console_p;
char *console_c;
size_t size, cursor;
+ struct mapping console_mapping;
if (console.tag != LB_TAG_CBMEM_CONSOLE) {
fprintf(stderr, "No console found in coreboot table.\n");
@@ -627,13 +677,16 @@ static void dump_console(int one_boot_only)
}
size = sizeof(*console_p);
- console_p = map_memory_size((unsigned long)console.cbmem_addr, size, 1);
+ console_p = map_memory(&console_mapping, console.cbmem_addr, size);
+ if (!console_p)
+ die("Unable to map console object.\n");
+
cursor = console_p->cursor & CBMC_CURSOR_MASK;
if (!(console_p->cursor & CBMC_OVERFLOW) && cursor < console_p->size)
size = cursor;
else
size = console_p->size;
- unmap_memory();
+ unmap_memory(&console_mapping);
console_c = malloc(size + 1);
if (!console_c) {
@@ -642,8 +695,12 @@ static void dump_console(int one_boot_only)
}
console_c[size] = '\0';
- console_p = map_memory_size((unsigned long)console.cbmem_addr,
- size + sizeof(*console_p), 1);
+ console_p = map_memory(&console_mapping, console.cbmem_addr,
+ size + sizeof(*console_p));
+
+ if (!console_p)
+ die("Unable to map full console object.\n");
+
if (console_p->cursor & CBMC_OVERFLOW) {
if (cursor >= size) {
printf("cbmem: ERROR: CBMEM console struct is illegal, "
@@ -693,7 +750,7 @@ static void dump_console(int one_boot_only)
puts(console_c + cursor);
free(console_c);
- unmap_memory();
+ unmap_memory(&console_mapping);
}
static void hexdump(unsigned long memory, int length)
@@ -701,14 +758,11 @@ static void hexdump(unsigned long memory, int length)
int i;
const uint8_t *m;
int all_zero = 0;
+ struct mapping hexdump_mapping;
- m = map_memory_size((intptr_t)memory, length, 1);
-
- if (length > MAP_BYTES) {
- printf("Truncating hex dump from %d to %d bytes\n\n",
- length, MAP_BYTES);
- length = MAP_BYTES;
- }
+ m = map_memory(&hexdump_mapping, memory, length);
+ if (!m)
+ die("Unable to map hexdump memory.\n");
for (i = 0; i < length; i += 16) {
int j;
@@ -734,7 +788,7 @@ static void hexdump(unsigned long memory, int length)
}
}
- unmap_memory();
+ unmap_memory(&hexdump_mapping);
}
static void dump_cbmem_hex(void)
@@ -751,16 +805,16 @@ void rawdump(uint64_t base, uint64_t size)
{
int i;
const uint8_t *m;
+ struct mapping dump_mapping;
- m = map_memory_size((intptr_t)base, size, 1);
- if (!m) {
- fprintf(stderr, "Failed to map memory");
- return;
- }
+ m = map_memory(&dump_mapping, base, size);
+ if (!m)
+ die("Unable to map rawdump memory\n");
for (i = 0 ; i < size; i++)
printf("%c", m[i]);
- unmap_memory();
+
+ unmap_memory(&dump_mapping);
}
static void dump_cbmem_raw(unsigned int id)
@@ -770,14 +824,14 @@ static void dump_cbmem_raw(unsigned int id)
uint64_t base = 0;
uint64_t size = 0;
- table = map_lbtable();
+ table = mapping_virt(&lbtable_mapping);
if (table == NULL)
return;
offset = 0;
- while (offset < lbtable_size) {
+ while (offset < mapping_size(&lbtable_mapping)) {
const struct lb_record *lbr;
const struct lb_cbmem_entry *lbe;
@@ -796,8 +850,6 @@ static void dump_cbmem_raw(unsigned int id)
}
}
- unmap_lbtable();
-
if (!base)
fprintf(stderr, "id %0x not found in cbtable\n", id);
else
@@ -852,7 +904,7 @@ static void dump_cbmem_toc(void)
const uint8_t *table;
size_t offset;
- table = map_lbtable();
+ table = mapping_virt(&lbtable_mapping);
if (table == NULL)
return;
@@ -863,7 +915,7 @@ static void dump_cbmem_toc(void)
i = 0;
offset = 0;
- while (offset < lbtable_size) {
+ while (offset < mapping_size(&lbtable_mapping)) {
const struct lb_record *lbr;
const struct lb_cbmem_entry *lbe;
@@ -877,8 +929,6 @@ static void dump_cbmem_toc(void)
cbmem_print_entry(i, lbe->id, lbe->address, lbe->entry_size);
i++;
}
-
- unmap_lbtable();
}
#define COVERAGE_MAGIC 0x584d4153
@@ -913,6 +963,7 @@ static void dump_coverage(void)
uint64_t start;
size_t size;
const void *coverage;
+ struct mapping coverage_mapping;
unsigned long phys_offset;
#define phys_to_virt(x) ((void *)(unsigned long)(x) + phys_offset)
@@ -922,7 +973,9 @@ static void dump_coverage(void)
}
/* Map coverage area */
- coverage = map_memory_size(start, size, 1);
+ coverage = map_memory(&coverage_mapping, start, size);
+ if (!coverage)
+ die("Unable to map coverage area.\n");
phys_offset = (unsigned long)coverage - (unsigned long)start;
printf("Dumping coverage data...\n");
@@ -959,7 +1012,7 @@ static void dump_coverage(void)
else
file = NULL;
}
- unmap_memory();
+ unmap_memory(&coverage_mapping);
}
static void print_version(void)
@@ -1251,18 +1304,21 @@ int main(int argc, char** argv)
dtbuffer++;
}
- parse_cbtable(baseaddr, cb_table_size, 1);
+ parse_cbtable(baseaddr, cb_table_size);
#else
int j;
- static const int possible_base_addresses[] = { 0, 0xf0000 };
+ unsigned long long possible_base_addresses[] = { 0, 0xf0000 };
/* Find and parse coreboot table */
for (j = 0; j < ARRAY_SIZE(possible_base_addresses); j++) {
- if (parse_cbtable(possible_base_addresses[j], MAP_BYTES, 1))
+ if (!parse_cbtable(possible_base_addresses[j], 0))
break;
}
#endif
+ if (mapping_virt(&lbtable_mapping) == NULL)
+ die("Table not found.\n");
+
if (print_console)
dump_console(one_boot_only);
@@ -1281,6 +1337,8 @@ int main(int argc, char** argv)
if (print_defaults || print_timestamps)
dump_timestamps(machine_readable_timestamps);
+ unmap_memory(&lbtable_mapping);
+
close(mem_fd);
return 0;
}