From: Zhao Yakui <yakui.zhao@xxxxxxxxx>
Add the support of dumping ACPI table through /sys/firmware/acpi/tables. If it
succeeds, dump the dynamic SSDT table and then exit. Otherwise it will fall back
to dump the ACPI table by maping /dev/mem.
Signed-off-by: Zhao Yakui <yakui.zhao@xxxxxxxxx>
---
acpidump/acpidump.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
Index: pmtools/acpidump/acpidump.c
===================================================================
--- pmtools.orig/acpidump/acpidump.c
+++ pmtools/acpidump/acpidump.c
@@ -374,6 +374,84 @@ static void acpi_dump_dynamic_SSDT(int o
return;
}
+#define FIRMWARE_ACPI_TABLE "/sys/firmware/acpi/tables"
+static int acpi_dump_firmware_table(int out_fd)
+{
+ struct stat file_stat;
+ char filename[256], *ptr;
+ DIR *tabledir;
+ struct dirent *entry;
+ FILE *fp;
+ int count, readcount, length;
+ struct acpi_table_header table_header, *ptable;
+ int table_count = 0;
+
+ if (stat(FIRMWARE_ACPI_TABLE, &file_stat) == -1) {
+ /* The directory doesn't exist */
+ return 0;
+ }
+ tabledir = opendir(FIRMWARE_ACPI_TABLE);
+ if(!tabledir){
+ /*can't open the directory */
+ return 0;
+ }
+
+ while ((entry = readdir(tabledir)) != 0){
+ /* skip the file of . /.. */
+ if (entry->d_name[0] == '.')
+ continue;
+
+ if (entry->d_type == DT_DIR) {
+ /*
+ * Skip the directory of /sys/firmware/acpi/tables/dynamic.
+ * It will be handled in another function.
+ */
+ continue;
+ }
+ sprintf(filename, "%s/%s", FIRMWARE_ACPI_TABLE, entry->d_name);
+ fp = fopen(filename, "r");
+ if (fp == NULL) {
+ fprintf(stderr, "Can't open the file of %s\n",
+ filename);
+ continue;
+ }
+ /* Read the Table header to parse the table length.
+ * Although the FACS table has no table header definition, it has
+ * the same definition as table header for the first 8 bytes.
+ * At the same time according to the spec the table length of FACS
+ * is >=64, which is greater than the length of table_header.
+ * So we still use table_header structure to parse the table
+ * length for FACS.
+ */
+ count = fread(&table_header, 1, sizeof(struct acpi_table_header), fp);
+ if (count < sizeof(table_header)) {
+ /* the length is lessn than ACPI table header. skip it */
+ fclose(fp);
+ continue;
+ }
+ length = table_header.length;
+ ptr = malloc(table_header.length);
+ fseek(fp, 0, SEEK_SET);
+ readcount = 0;
+ while(!feof(fp) && readcount < length) {
+ count = fread(ptr + readcount, 1, 256, fp);
+ readcount += count;
+ }
+ fclose(fp);
+ ptable = (struct acpi_table_header *) ptr;
+ /* Skip the checksum for FACS table */
+ if (strncmp(ptable->signature, "FACS", 4) &&
+ checksum((u8 *) ptable, ptable->length))
+ fprintf(stderr, "Wrong checksum "
+ "for table %s!\n", entry->d_name);
+ write_table(out_fd, ptable, 0);
+ free(ptr);
+ table_count++;
+ }
+ closedir(tabledir);
+ return table_count;
+}
+
static void usage(const char *progname)
{
puts("Usage:");
@@ -495,6 +573,19 @@ int main(int argc, char **argv)
return 0;
}
+ /*
+ * Prefer dumping ACPI table by enumerating the directory
+ * of /sys/firmware/acpi/tables.
+ * If it succeeds, dump dynamic SSDT table and exit. And if it fails
+ * in dumping ACPI table, fall back to the conventional dumping
+ * mechanism by mapping /dev/mem.
+ */
+ if (acpi_dump_firmware_table(fd)) {
+ acpi_dump_dynamic_SSDT(fd);
+ close(fd);
+ return 0;
+ }
+
length = sizeof(struct acpi_rsdp_descriptor);
if (!addr) {
addr = read_efi_systab();
--
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