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-rw-r--r--util/cbmem/cbmem.c175
1 files changed, 158 insertions, 17 deletions
diff --git a/util/cbmem/cbmem.c b/util/cbmem/cbmem.c
index 1117c664aa..aa9fa13592 100644
--- a/util/cbmem/cbmem.c
+++ b/util/cbmem/cbmem.c
@@ -24,6 +24,7 @@
#include <unistd.h>
#include <inttypes.h>
#include <getopt.h>
+#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
@@ -40,6 +41,7 @@
#include "boot/coreboot_tables.h"
+typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
@@ -54,7 +56,7 @@ static int verbose = 0;
#define debug(x...) if(verbose) printf(x)
/* File handle used to access /dev/mem */
-static int fd;
+static int mem_fd;
/*
* calculate ip checksum (16 bit quantities) on a passed in buffer. In case
@@ -118,7 +120,7 @@ static void *map_memory_size(u64 physical, size_t size)
debug("Mapping %zuMB of physical memory at 0x%jx.\n",
size_to_mib(size), (intmax_t)p);
- v = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, p);
+ v = mmap(NULL, size, PROT_READ, MAP_SHARED, mem_fd, p);
if (v == MAP_FAILED) {
fprintf(stderr, "Failed to mmap /dev/mem: %s\n",
@@ -823,6 +825,121 @@ static void print_usage(const char *name)
exit(1);
}
+#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;
@@ -883,33 +1000,57 @@ int main(int argc, char** argv)
}
}
- fd = open("/dev/mem", O_RDONLY, 0);
- if (fd < 0) {
+ 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 dt_fd;
- uint32_t cbtable_base;
+ int addr_cells, size_cells;
+ char *coreboot_node = dt_find_compat("/proc/device-tree", "coreboot",
+ &addr_cells, &size_cells);
- dt_fd = open("/proc/device-tree/firmware/coreboot/coreboot-table",
- O_RDONLY, 0);
- if (dt_fd < 0) {
- fprintf(stderr, "Failed to open device tree node: %s\n",
- strerror(errno));
+ if (!coreboot_node) {
+ fprintf(stderr, "Could not find 'coreboot' compatible node!\n");
return 1;
}
- if (read(dt_fd, &cbtable_base, 4) != 4) {
- fprintf(stderr, "Failed to read device tree node: %s\n",
- strerror(errno));
+ 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;
+ u8 *baseaddr_buffer = alloca(addr_cells * 4);
+ if (read(fd, baseaddr_buffer, addr_cells * 4) < 0) {
+ perror(reg);
return 1;
}
- close(dt_fd);
+ close(fd);
- parse_cbtable(ntohl(cbtable_base));
+ /* 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 |= baseaddr_buffer[i];
+ }
+
+ parse_cbtable(baseaddr);
#else
int j;
static const int possible_base_addresses[] = { 0, 0xf0000 };
@@ -936,6 +1077,6 @@ int main(int argc, char** argv)
if (print_defaults || print_timestamps)
dump_timestamps();
- close(fd);
+ close(mem_fd);
return 0;
}