coreboot-kgpe-d16/util/cbmem/cbmem.c

1234 lines
28 KiB
C

/*
* This file is part of the coreboot project.
*
* Copyright 2012 Google Inc.
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
*
* 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 <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <getopt.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <libgen.h>
#include <assert.h>
#include <commonlib/cbmem_id.h>
#include <commonlib/timestamp_serialized.h>
#include <commonlib/coreboot_tables.h>
#ifdef __OpenBSD__
#include <sys/param.h>
#include <sys/sysctl.h>
#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;
#define CBMEM_VERSION "1.1"
/* verbose output? */
static int verbose = 0;
#define debug(x...) if(verbose) printf(x)
/* File handle used to access /dev/mem */
static int mem_fd;
static uint64_t lbtable_address;
static size_t lbtable_size;
/*
* Some architectures map /dev/mem memory in a way that doesn't support
* unaligned accesses. Most normal libc memcpy()s aren't safe to use in this
* case, so build our own which makes sure to never do unaligned accesses on
* *src (*dest is fine since we never map /dev/mem for writing).
*/
static void *aligned_memcpy(void *dest, const void *src, size_t n)
{
u8 *d = dest;
const volatile u8 *s = src; /* volatile to prevent optimization */
while ((uintptr_t)s & (sizeof(size_t) - 1)) {
if (n-- == 0)
return dest;
*d++ = *s++;
}
while (n >= sizeof(size_t)) {
*(size_t *)d = *(const volatile size_t *)s;
d += sizeof(size_t);
s += sizeof(size_t);
n -= sizeof(size_t);
}
while (n-- > 0)
*d++ = *s++;
return dest;
}
/*
* calculate ip checksum (16 bit quantities) on a passed in buffer. In case
* the buffer length is odd last byte is excluded from the calculation
*/
static u16 ipchcksum(const void *addr, unsigned size)
{
const u16 *p = addr;
unsigned i, n = size / 2; /* don't expect odd sized blocks */
u32 sum = 0;
for (i = 0; i < n; i++)
sum += p[i];
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
sum = ~sum & 0xffff;
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 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(mapped_virtual, mapped_size);
mapped_virtual = NULL;
mapped_size = 0;
}
static void *map_memory_size(u64 physical, size_t size, uint8_t abort_on_failure)
{
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);
if (v == MAP_FAILED) {
/* 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 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)
{
uint8_t *table;
size_t offset;
int ret = -1;
table = map_lbtable();
if (table == NULL)
return -1;
offset = 0;
while (offset < lbtable_size) {
struct lb_record *lbr;
struct lb_cbmem_entry *lbe;
lbr = (void *)(table + offset);
offset += lbr->size;
if (lbr->tag != LB_TAG_CBMEM_ENTRY)
continue;
lbe = (void *)lbr;
if (lbe->id != id)
continue;
*addr = lbe->address;
*size = lbe->entry_size;
ret = 0;
break;
}
unmap_lbtable();
return ret;
}
/*
* Try finding the timestamp table and coreboot cbmem console starting from the
* passed in memory offset. Could be called recursively in case a forwarding
* entry is found.
*
* Returns pointer to a memory buffer containg the timestamp table or zero if
* none found.
*/
static struct lb_cbmem_ref timestamps;
static struct lb_cbmem_ref console;
static struct lb_memory_range cbmem;
/* This is a work-around for a nasty problem introduced by initially having
* pointer sized entries in the lb_cbmem_ref structures. This caused problems
* on 64bit x86 systems because coreboot is 32bit on those systems.
* When the problem was found, it was corrected, but there are a lot of
* systems out there with a firmware that does not produce the right
* lb_cbmem_ref structure. Hence we try to autocorrect this issue here.
*/
static struct lb_cbmem_ref parse_cbmem_ref(struct lb_cbmem_ref *cbmem_ref)
{
struct lb_cbmem_ref ret;
ret = *cbmem_ref;
if (cbmem_ref->size < sizeof(*cbmem_ref))
ret.cbmem_addr = (uint32_t)ret.cbmem_addr;
debug(" cbmem_addr = %" PRIx64 "\n", ret.cbmem_addr);
return ret;
}
static int parse_cbtable(u64 address, size_t table_size, uint8_t abort_on_failure)
{
int i, found = 0, ret = 0;
void *buf;
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;
/* look at every 16 bytes within 4K of the base */
for (i = 0; i < 0x1000; i += 0x10) {
struct lb_header *lbh;
struct lb_record* lbr_p;
void *lbtable;
int j;
lbh = (struct lb_header *)(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) !=
lbh->table_checksum) {
debug("Signature found, but wrong checksum.\n");
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 = (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");
struct lb_memory *memory =
(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((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: {
/*
* This is a forwarding entry - repeat the
* search at the new address.
*/
struct lb_forward lbf_p =
*(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;
}
}
}
unmap_memory();
return found;
}
#if defined(linux) && (defined(__i386__) || defined(__x86_64__))
/*
* read CPU frequency from a sysfs file, return an frequency in Megahertz as
* an int or exit on any error.
*/
static unsigned long arch_tick_frequency(void)
{
FILE *cpuf;
char freqs[100];
int size;
char *endp;
u64 rv;
const char* freq_file =
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq";
cpuf = fopen(freq_file, "r");
if (!cpuf) {
fprintf(stderr, "Could not open %s: %s\n",
freq_file, strerror(errno));
exit(1);
}
memset(freqs, 0, sizeof(freqs));
size = fread(freqs, 1, sizeof(freqs), cpuf);
if (!size || (size == sizeof(freqs))) {
fprintf(stderr, "Wrong number of bytes(%d) read from %s\n",
size, freq_file);
exit(1);
}
fclose(cpuf);
rv = strtoull(freqs, &endp, 10);
if (*endp == '\0' || *endp == '\n')
/* cpuinfo_max_freq is in kHz. Convert it to MHz. */
return rv / 1000;
fprintf(stderr, "Wrong formatted value ^%s^ read from %s\n",
freqs, freq_file);
exit(1);
}
#elif defined(__OpenBSD__) && (defined(__i386__) || defined(__x86_64__))
static unsigned long arch_tick_frequency(void)
{
int mib[2] = { CTL_HW, HW_CPUSPEED };
static int value = 0;
size_t value_len = sizeof(value);
/* Return 1 MHz when sysctl fails. */
if ((value == 0) && (sysctl(mib, 2, &value, &value_len, NULL, 0) == -1))
return 1;
return value;
}
#else
static unsigned long arch_tick_frequency(void)
{
/* 1 MHz = 1us. */
return 1;
}
#endif
static unsigned long tick_freq_mhz;
static void timestamp_set_tick_freq(unsigned long table_tick_freq_mhz)
{
tick_freq_mhz = table_tick_freq_mhz;
/* Honor table frequency. */
if (tick_freq_mhz)
return;
tick_freq_mhz = arch_tick_frequency();
if (!tick_freq_mhz) {
fprintf(stderr, "Cannot determine timestamp tick frequency.\n");
exit(1);
}
}
u64 arch_convert_raw_ts_entry(u64 ts)
{
return ts / tick_freq_mhz;
}
/*
* Print an integer in 'normalized' form - with commas separating every three
* decimal orders.
*/
static void print_norm(u64 v)
{
if (v >= 1000) {
/* print the higher order sections first */
print_norm(v / 1000);
printf(",%3.3u", (u32)(v % 1000));
} else {
printf("%u", (u32)(v % 1000));
}
}
static const char *timestamp_name(uint32_t id)
{
int i;
for (i = 0; i < ARRAY_SIZE(timestamp_ids); i++) {
if (timestamp_ids[i].id == id)
return timestamp_ids[i].name;
}
return "<unknown>";
}
static uint64_t timestamp_print_parseable_entry(uint32_t id, uint64_t stamp,
uint64_t prev_stamp)
{
const char *name;
uint64_t step_time;
name = timestamp_name(id);
step_time = arch_convert_raw_ts_entry(stamp - prev_stamp);
/* ID<tab>absolute time<tab>relative time<tab>description */
printf("%d\t", id);
printf("%llu\t", (long long)arch_convert_raw_ts_entry(stamp));
printf("%llu\t", (long long)step_time);
printf("%s\n", name);
return step_time;
}
uint64_t timestamp_print_entry(uint32_t id, uint64_t stamp, uint64_t prev_stamp)
{
const char *name;
uint64_t step_time;
name = timestamp_name(id);
printf("%4d:", id);
printf("%-50s", name);
print_norm(arch_convert_raw_ts_entry(stamp));
step_time = arch_convert_raw_ts_entry(stamp - prev_stamp);
if (prev_stamp) {
printf(" (");
print_norm(step_time);
printf(")");
}
printf("\n");
return step_time;
}
/* dump the timestamp table */
static void dump_timestamps(int mach_readable)
{
int i;
struct timestamp_table *tst_p;
size_t size;
uint64_t prev_stamp;
uint64_t total_time;
if (timestamps.tag != LB_TAG_TIMESTAMPS) {
fprintf(stderr, "No timestamps found in coreboot table.\n");
return;
}
size = sizeof(*tst_p);
tst_p = map_memory_size((unsigned long)timestamps.cbmem_addr, size, 1);
timestamp_set_tick_freq(tst_p->tick_freq_mhz);
if (!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);
/* Report the base time within the table. */
prev_stamp = 0;
if (mach_readable)
timestamp_print_parseable_entry(0, tst_p->base_time,
prev_stamp);
else
timestamp_print_entry(0, tst_p->base_time, prev_stamp);
prev_stamp = tst_p->base_time;
total_time = 0;
for (i = 0; i < tst_p->num_entries; i++) {
uint64_t stamp;
const struct timestamp_entry *tse = &tst_p->entries[i];
/* Make all timestamps absolute. */
stamp = tse->entry_stamp + tst_p->base_time;
if (mach_readable)
total_time +=
timestamp_print_parseable_entry(tse->entry_id,
stamp, prev_stamp);
else
total_time += timestamp_print_entry(tse->entry_id,
stamp, prev_stamp);
prev_stamp = stamp;
}
if (!mach_readable) {
printf("\nTotal Time: ");
print_norm(total_time);
printf("\n");
}
unmap_memory();
}
struct cbmem_console {
u32 size;
u32 cursor;
u8 body[0];
} __attribute__ ((__packed__));
#define CBMC_CURSOR_MASK ((1 << 28) - 1)
#define CBMC_OVERFLOW (1 << 31)
/* dump the cbmem console */
static void dump_console(void)
{
struct cbmem_console *console_p;
char *console_c;
size_t size, cursor;
if (console.tag != LB_TAG_CBMEM_CONSOLE) {
fprintf(stderr, "No console found in coreboot table.\n");
return;
}
size = sizeof(*console_p);
console_p = map_memory_size((unsigned long)console.cbmem_addr, size, 1);
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();
console_c = malloc(size + 1);
if (!console_c) {
fprintf(stderr, "Not enough memory for console.\n");
exit(1);
}
console_c[size] = '\0';
console_p = map_memory_size((unsigned long)console.cbmem_addr,
size + sizeof(*console_p), 1);
if (console_p->cursor & CBMC_OVERFLOW) {
if (cursor >= size) {
printf("cbmem: ERROR: CBMEM console struct is illegal, "
"output may be corrupt or out of order!\n\n");
cursor = 0;
}
aligned_memcpy(console_c, console_p->body + cursor,
size - cursor);
aligned_memcpy(console_c + size - cursor,
console_p->body, cursor);
} else {
aligned_memcpy(console_c, console_p->body, size);
}
/* Slight memory corruption may occur between reboots and give us a few
unprintable characters like '\0'. Replace them with '?' on output. */
for (cursor = 0; cursor < size; cursor++)
if (!isprint(console_c[cursor]) && !isspace(console_c[cursor]))
console_c[cursor] = '?';
printf("%s\n", console_c);
free(console_c);
unmap_memory();
}
static void hexdump(unsigned long memory, int length)
{
int i;
uint8_t *m;
int all_zero = 0;
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;
}
for (i = 0; i < length; i += 16) {
int j;
all_zero++;
for (j = 0; j < 16; j++) {
if(m[i+j] != 0) {
all_zero = 0;
break;
}
}
if (all_zero < 2) {
printf("%08lx:", memory + i);
for (j = 0; j < 16; j++)
printf(" %02x", m[i+j]);
printf(" ");
for (j = 0; j < 16; j++)
printf("%c", isprint(m[i+j]) ? m[i+j] : '.');
printf("\n");
} else if (all_zero == 2) {
printf("...\n");
}
}
unmap_memory();
}
static void dump_cbmem_hex(void)
{
if (cbmem.type != LB_MEM_TABLE) {
fprintf(stderr, "No coreboot CBMEM area found!\n");
return;
}
hexdump(unpack_lb64(cbmem.start), unpack_lb64(cbmem.size));
}
void rawdump(uint64_t base, uint64_t size)
{
int i;
uint8_t *m;
m = map_memory_size((intptr_t)base, size, 1);
if (!m) {
fprintf(stderr, "Failed to map memory");
return;
}
for (i = 0 ; i < size; i++)
printf("%c", m[i]);
unmap_memory();
}
static void dump_cbmem_raw(unsigned int id)
{
uint8_t *table;
size_t offset;
uint64_t base = 0;
uint64_t size = 0;
table = map_lbtable();
if (table == NULL)
return;
offset = 0;
while (offset < lbtable_size) {
struct lb_record *lbr;
struct lb_cbmem_entry *lbe;
lbr = (void *)(table + offset);
offset += lbr->size;
if (lbr->tag != LB_TAG_CBMEM_ENTRY)
continue;
lbe = (void *)lbr;
if (lbe->id == id) {
debug("found id for raw dump %0x", lbe->id);
base = lbe->address;
size = lbe->entry_size;
break;
}
}
unmap_lbtable();
if (!base)
fprintf(stderr, "id %0x not found in cbtable\n", id);
else
rawdump(base, size);
}
struct cbmem_id_to_name {
uint32_t id;
const char *name;
};
static const struct cbmem_id_to_name cbmem_ids[] = { CBMEM_ID_TO_NAME_TABLE };
void cbmem_print_entry(int n, uint32_t id, uint64_t base, uint64_t size)
{
int i;
const char *name;
name = NULL;
for (i = 0; i < ARRAY_SIZE(cbmem_ids); i++) {
if (cbmem_ids[i].id == id) {
name = cbmem_ids[i].name;
break;
}
}
printf("%2d. ", n);
if (name == NULL)
printf("%08x ", id);
else
printf("%s\t%08x", name, id);
printf(" %08" PRIx64 " ", base);
printf(" %08" PRIx64 "\n", size);
}
static void dump_cbmem_toc(void)
{
int i;
uint8_t *table;
size_t offset;
table = map_lbtable();
if (table == NULL)
return;
printf("CBMEM table of contents:\n");
printf(" NAME ID START LENGTH\n");
i = 0;
offset = 0;
while (offset < lbtable_size) {
struct lb_record *lbr;
struct lb_cbmem_entry *lbe;
lbr = (void *)(table + offset);
offset += lbr->size;
if (lbr->tag != LB_TAG_CBMEM_ENTRY)
continue;
lbe = (void *)lbr;
cbmem_print_entry(i, lbe->id, lbe->address, lbe->entry_size);
i++;
}
unmap_lbtable();
}
#define COVERAGE_MAGIC 0x584d4153
struct file {
uint32_t magic;
uint32_t next;
uint32_t filename;
uint32_t data;
int offset;
int len;
};
static int mkpath(char *path, mode_t mode)
{
assert (path && *path);
char *p;
for (p = strchr(path+1, '/'); p; p = strchr(p + 1, '/')) {
*p = '\0';
if (mkdir(path, mode) == -1) {
if (errno != EEXIST) {
*p = '/';
return -1;
}
}
*p = '/';
}
return 0;
}
static void dump_coverage(void)
{
uint64_t start;
size_t size;
void *coverage;
unsigned long phys_offset;
#define phys_to_virt(x) ((void *)(unsigned long)(x) + phys_offset)
if (find_cbmem_entry(CBMEM_ID_COVERAGE, &start, &size)) {
fprintf(stderr, "No coverage information found\n");
return;
}
/* Map coverage area */
coverage = map_memory_size(start, size, 1);
phys_offset = (unsigned long)coverage - (unsigned long)start;
printf("Dumping coverage data...\n");
struct file *file = (struct file *)coverage;
while (file && file->magic == COVERAGE_MAGIC) {
FILE *f;
char *filename;
debug(" -> %s\n", (char *)phys_to_virt(file->filename));
filename = strdup((char *)phys_to_virt(file->filename));
if (mkpath(filename, 0755) == -1) {
perror("Directory for coverage data could "
"not be created");
exit(1);
}
f = fopen(filename, "wb");
if (!f) {
printf("Could not open %s: %s\n",
filename, strerror(errno));
exit(1);
}
if (fwrite((void *)phys_to_virt(file->data),
file->len, 1, f) != 1) {
printf("Could not write to %s: %s\n",
filename, strerror(errno));
exit(1);
}
fclose(f);
free(filename);
if (file->next)
file = (struct file *)phys_to_virt(file->next);
else
file = NULL;
}
unmap_memory();
}
static void print_version(void)
{
printf("cbmem v%s -- ", CBMEM_VERSION);
printf("Copyright (C) 2012 The ChromiumOS Authors. All rights reserved.\n\n");
printf(
"This program is free software: you can redistribute it and/or modify\n"
"it under the terms of the GNU General Public License as published by\n"
"the Free Software Foundation, version 2 of the License.\n\n"
"This program is distributed in the hope that it will be useful,\n"
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
"GNU General Public License for more details.\n\n");
}
static void print_usage(const char *name, int exit_code)
{
printf("usage: %s [-cCltTxVvh?]\n", name);
printf("\n"
" -c | --console: print cbmem console\n"
" -C | --coverage: dump coverage information\n"
" -l | --list: print cbmem table of contents\n"
" -x | --hexdump: print hexdump of cbmem area\n"
" -r | --rawdump ID: print rawdump of specific ID (in hex) of cbtable\n"
" -t | --timestamps: print timestamp information\n"
" -T | --parseable-timestamps: print parseable timestamps\n"
" -V | --verbose: verbose (debugging) output\n"
" -v | --version: print the version\n"
" -h | --help: print this help\n"
"\n");
exit(exit_code);
}
#ifdef __arm__
static void dt_update_cells(const char *name, int *addr_cells_ptr,
int *size_cells_ptr)
{
if (*addr_cells_ptr >= 0 && *size_cells_ptr >= 0)
return;
int buffer;
size_t nlen = strlen(name);
char *prop = alloca(nlen + sizeof("/#address-cells"));
strcpy(prop, name);
if (*addr_cells_ptr < 0) {
strcpy(prop + nlen, "/#address-cells");
int fd = open(prop, O_RDONLY);
if (fd < 0 && errno != ENOENT) {
perror(prop);
} else if (fd >= 0) {
if (read(fd, &buffer, sizeof(int)) < 0)
perror(prop);
else
*addr_cells_ptr = ntohl(buffer);
close(fd);
}
}
if (*size_cells_ptr < 0) {
strcpy(prop + nlen, "/#size-cells");
int fd = open(prop, O_RDONLY);
if (fd < 0 && errno != ENOENT) {
perror(prop);
} else if (fd >= 0) {
if (read(fd, &buffer, sizeof(int)) < 0)
perror(prop);
else
*size_cells_ptr = ntohl(buffer);
close(fd);
}
}
}
static char *dt_find_compat(const char *parent, const char *compat,
int *addr_cells_ptr, int *size_cells_ptr)
{
char *ret = NULL;
struct dirent *entry;
DIR *dir;
if (!(dir = opendir(parent))) {
perror(parent);
return NULL;
}
/* Loop through all files in the directory (DT node). */
while ((entry = readdir(dir))) {
/* We only care about compatible props or subnodes. */
if (entry->d_name[0] == '.' || !((entry->d_type & DT_DIR) ||
!strcmp(entry->d_name, "compatible")))
continue;
/* Assemble the file name (on the stack, for speed). */
size_t plen = strlen(parent);
char *name = alloca(plen + strlen(entry->d_name) + 2);
strcpy(name, parent);
name[plen] = '/';
strcpy(name + plen + 1, entry->d_name);
/* If it's a subnode, recurse. */
if (entry->d_type & DT_DIR) {
ret = dt_find_compat(name, compat, addr_cells_ptr,
size_cells_ptr);
/* There is only one matching node to find, abort. */
if (ret) {
/* Gather cells values on the way up. */
dt_update_cells(parent, addr_cells_ptr,
size_cells_ptr);
break;
}
continue;
}
/* If it's a compatible string, see if it's the right one. */
int fd = open(name, O_RDONLY);
int clen = strlen(compat);
char *buffer = alloca(clen + 1);
if (fd < 0) {
perror(name);
continue;
}
if (read(fd, buffer, clen + 1) < 0) {
perror(name);
close(fd);
continue;
}
close(fd);
if (!strcmp(compat, buffer)) {
/* Initialize these to "unset" for the way up. */
*addr_cells_ptr = *size_cells_ptr = -1;
/* Can't leave string on the stack or we'll lose it! */
ret = strdup(parent);
break;
}
}
closedir(dir);
return ret;
}
#endif /* __arm__ */
int main(int argc, char** argv)
{
int print_defaults = 1;
int print_console = 0;
int print_coverage = 0;
int print_list = 0;
int print_hexdump = 0;
int print_rawdump = 0;
int print_timestamps = 0;
int machine_readable_timestamps = 0;
unsigned int rawdump_id = 0;
int opt, option_index = 0;
static struct option long_options[] = {
{"console", 0, 0, 'c'},
{"coverage", 0, 0, 'C'},
{"list", 0, 0, 'l'},
{"timestamps", 0, 0, 't'},
{"parseable-timestamps", 0, 0, 'T'},
{"hexdump", 0, 0, 'x'},
{"rawdump", required_argument, 0, 'r'},
{"verbose", 0, 0, 'V'},
{"version", 0, 0, 'v'},
{"help", 0, 0, 'h'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, "cCltTxVvh?r:",
long_options, &option_index)) != EOF) {
switch (opt) {
case 'c':
print_console = 1;
print_defaults = 0;
break;
case 'C':
print_coverage = 1;
print_defaults = 0;
break;
case 'l':
print_list = 1;
print_defaults = 0;
break;
case 'x':
print_hexdump = 1;
print_defaults = 0;
break;
case 'r':
print_rawdump = 1;
print_defaults = 0;
rawdump_id = strtoul(optarg, NULL, 16);
break;
case 't':
print_timestamps = 1;
print_defaults = 0;
break;
case 'T':
print_timestamps = 1;
machine_readable_timestamps = 1;
print_defaults = 0;
break;
case 'V':
verbose = 1;
break;
case 'v':
print_version();
exit(0);
break;
case 'h':
print_usage(argv[0], 0);
break;
case '?':
default:
print_usage(argv[0], 1);
break;
}
}
mem_fd = open("/dev/mem", O_RDONLY, 0);
if (mem_fd < 0) {
fprintf(stderr, "Failed to gain memory access: %s\n",
strerror(errno));
return 1;
}
#ifdef __arm__
int addr_cells, size_cells;
char *coreboot_node = dt_find_compat("/proc/device-tree", "coreboot",
&addr_cells, &size_cells);
if (!coreboot_node) {
fprintf(stderr, "Could not find 'coreboot' compatible node!\n");
return 1;
}
if (addr_cells < 0) {
fprintf(stderr, "Warning: no #address-cells node in tree!\n");
addr_cells = 1;
}
int nlen = strlen(coreboot_node);
char *reg = alloca(nlen + sizeof("/reg"));
strcpy(reg, coreboot_node);
strcpy(reg + nlen, "/reg");
free(coreboot_node);
int fd = open(reg, O_RDONLY);
if (fd < 0) {
perror(reg);
return 1;
}
int i;
size_t size_to_read = addr_cells * 4 + size_cells * 4;
u8 *dtbuffer = alloca(size_to_read);
if (read(fd, dtbuffer, size_to_read) < 0) {
perror(reg);
return 1;
}
close(fd);
/* No variable-length byte swap function anywhere in C... how sad. */
u64 baseaddr = 0;
for (i = 0; i < addr_cells * 4; i++) {
baseaddr <<= 8;
baseaddr |= *dtbuffer;
dtbuffer++;
}
u64 cb_table_size = 0;
for (i = 0; i < size_cells * 4; i++) {
cb_table_size <<= 8;
cb_table_size |= *dtbuffer;
dtbuffer++;
}
parse_cbtable(baseaddr, cb_table_size, 1);
#else
int j;
static const int 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))
break;
}
#endif
if (print_console)
dump_console();
if (print_coverage)
dump_coverage();
if (print_list)
dump_cbmem_toc();
if (print_hexdump)
dump_cbmem_hex();
if (print_rawdump)
dump_cbmem_raw(rawdump_id);
if (print_defaults || print_timestamps)
dump_timestamps(machine_readable_timestamps);
close(mem_fd);
return 0;
}