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-rw-r--r--kexec/arch/ppc/fs2dt.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/kexec/arch/ppc/fs2dt.c b/kexec/arch/ppc/fs2dt.c
new file mode 100644
index 0000000..fed499b
--- /dev/null
+++ b/kexec/arch/ppc/fs2dt.c
@@ -0,0 +1,471 @@
+/*
+ * fs2dt: creates a flattened device-tree
+ *
+ * Copyright (C) 2004,2005 Milton D Miller II, IBM Corporation
+ * Copyright (C) 2005 R Sharada (sharada@in.ibm.com), IBM Corporation
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include "../../kexec.h"
+#include "kexec-ppc.h"
+#include "types.h"
+
+#define MAXPATH 1024 /* max path name length */
+#define NAMESPACE 16384 /* max bytes for property names */
+#define TREEWORDS 65536 /* max 32 bit words for properties */
+#define MEMRESERVE 256 /* max number of reserved memory blks */
+#define MAX_MEMORY_RANGES 1024
+
+static char pathname[MAXPATH];
+static char propnames[NAMESPACE] = { 0 };
+static unsigned dtstruct[TREEWORDS], *dt;
+static unsigned long long mem_rsrv[2*MEMRESERVE] = { 0, 0 };
+
+static int crash_param;
+static char local_cmdline[COMMAND_LINE_SIZE] = { "" };
+static unsigned *dt_len; /* changed len of modified cmdline
+ in flat device-tree */
+static struct bootblock bb[1];
+
+void reserve(unsigned long long where, unsigned long long length)
+{
+ size_t offset;
+
+ for (offset = 0; mem_rsrv[offset + 1]; offset += 2)
+ ;
+
+ if (offset + 4 >= 2 * MEMRESERVE)
+ die("unrecoverable error: exhasuted reservation meta data\n");
+
+ mem_rsrv[offset] = where;
+ mem_rsrv[offset + 1] = length;
+ mem_rsrv[offset + 3] = 0; /* N.B: don't care about offset + 2 */
+}
+
+/* look for properties we need to reserve memory space for */
+static void checkprop(char *name, unsigned *data, int len)
+{
+ static unsigned long long base, size, end;
+
+ if ((data == NULL) && (base || size || end))
+ die("unrecoverable error: no property data");
+ else if (!strcmp(name, "linux,rtas-base"))
+ base = *data;
+ else if (!strcmp(name, "linux,tce-base"))
+ base = *(unsigned long long *) data;
+ else if (!strcmp(name, "rtas-size") ||
+ !strcmp(name, "linux,tce-size"))
+ size = *data;
+ else if (reuse_initrd && !strcmp(name, "linux,initrd-start"))
+ if (len == 8)
+ base = *(unsigned long long *) data;
+ else
+ base = *data;
+ else if (reuse_initrd && !strcmp(name, "linux,initrd-end"))
+ end = *(unsigned long long *) data;
+
+ if (size && end)
+ die("unrecoverable error: size and end set at same time\n");
+ if (base && size) {
+ reserve(base, size);
+ base = 0;
+ size = 0;
+ }
+ if (base && end) {
+ reserve(base, end-base);
+ base = 0;
+ end = 0;
+ }
+}
+
+/*
+ * return the property index for a property name, creating a new one
+ * if needed.
+ */
+static unsigned propnum(const char *name)
+{
+ unsigned offset = 0;
+
+ while (propnames[offset])
+ if (strcmp(name, propnames+offset))
+ offset += strlen(propnames+offset)+1;
+ else
+ return offset;
+
+ if (NAMESPACE - offset < strlen(name) + 1)
+ die("unrecoverable error: propnames overrun\n");
+
+ strcpy(propnames+offset, name);
+
+ return offset;
+}
+
+static void add_usable_mem_property(int fd, int len)
+{
+ char fname[MAXPATH], *bname;
+ unsigned long buf[2];
+ unsigned long ranges[2*MAX_MEMORY_RANGES];
+ unsigned long long base, end, loc_base, loc_end;
+ int range, rlen = 0;
+
+ strcpy(fname, pathname);
+ bname = strrchr(fname, '/');
+ bname[0] = '\0';
+ bname = strrchr(fname, '/');
+ if (strncmp(bname, "/memory@", 8) && strcmp(bname, "/memory"))
+ return;
+
+ if (lseek(fd, 0, SEEK_SET) < 0)
+ die("unrecoverable error: error seeking in \"%s\": %s\n",
+ pathname, strerror(errno));
+ if (read_memory_region_limits(fd, &base, &end) != 0)
+ die("unrecoverable error: error parsing memory/reg limits\n");
+
+ for (range = 0; range < usablemem_rgns.size; range++) {
+ loc_base = usablemem_rgns.ranges[range].start;
+ loc_end = usablemem_rgns.ranges[range].end;
+ if (loc_base >= base && loc_end <= end) {
+ ranges[rlen++] = loc_base;
+ ranges[rlen++] = loc_end - loc_base;
+ } else if (base < loc_end && end > loc_base) {
+ if (loc_base < base)
+ loc_base = base;
+ if (loc_end > end)
+ loc_end = end;
+ ranges[rlen++] = loc_base;
+ ranges[rlen++] = loc_end - loc_base;
+ }
+ }
+
+ if (!rlen) {
+ /*
+ * User did not pass any ranges for thsi region. Hence, write
+ * (0,0) duple in linux,usable-memory property such that
+ * this region will be ignored.
+ */
+ ranges[rlen++] = 0;
+ ranges[rlen++] = 0;
+ }
+
+ rlen = rlen * sizeof(unsigned long);
+ /*
+ * No add linux,usable-memory property.
+ */
+ *dt++ = 3;
+ *dt++ = rlen;
+ *dt++ = propnum("linux,usable-memory");
+ memcpy(dt, &ranges, rlen);
+ dt += (rlen + 3)/4;
+}
+
+/* put all properties (files) in the property structure */
+static void putprops(char *fn, struct dirent **nlist, int numlist)
+{
+ struct dirent *dp;
+ int i = 0, fd, len;
+ struct stat statbuf;
+
+ for (i = 0; i < numlist; i++) {
+ dp = nlist[i];
+ strcpy(fn, dp->d_name);
+
+ if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
+ continue;
+
+ if (lstat(pathname, &statbuf))
+ die("unrecoverable error: could not stat \"%s\": %s\n",
+ pathname, strerror(errno));
+
+ if (!crash_param && !strcmp(fn, "linux,crashkernel-base"))
+ continue;
+
+ if (!crash_param && !strcmp(fn, "linux,crashkernel-size"))
+ continue;
+
+ /*
+ * This property will be created for each node during kexec
+ * boot. So, ignore it.
+ */
+ if (!strcmp(dp->d_name, "linux,pci-domain") ||
+ !strcmp(dp->d_name, "linux,htab-base") ||
+ !strcmp(dp->d_name, "linux,htab-size") ||
+ !strcmp(dp->d_name, "linux,kernel-end") ||
+ !strcmp(dp->d_name, "linux,usable-memory"))
+ continue;
+
+ /* This property will be created/modified later in putnode()
+ * So ignore it, unless we are reusing the initrd.
+ */
+ if ((!strcmp(dp->d_name, "linux,initrd-start") ||
+ !strcmp(dp->d_name, "linux,initrd-end")) &&
+ !reuse_initrd)
+ continue;
+
+ if (!S_ISREG(statbuf.st_mode))
+ continue;
+
+ len = statbuf.st_size;
+
+ *dt++ = 3;
+ dt_len = dt;
+ *dt++ = len;
+ *dt++ = propnum(fn);
+
+ fd = open(pathname, O_RDONLY);
+ if (fd == -1)
+ die("unrecoverable error: could not open \"%s\": %s\n",
+ pathname, strerror(errno));
+
+ if (read(fd, dt, len) != len)
+ die("unrecoverable error: could not read \"%s\": %s\n",
+ pathname, strerror(errno));
+
+ checkprop(fn, dt, len);
+
+ /* Get the cmdline from the device-tree and modify it */
+ if (!strcmp(dp->d_name, "bootargs")) {
+ int cmd_len;
+ char temp_cmdline[COMMAND_LINE_SIZE] = { "" };
+ char *param = NULL;
+ cmd_len = strlen(local_cmdline);
+ if (cmd_len != 0) {
+ param = strstr(local_cmdline, "crashkernel=");
+ if (param)
+ crash_param = 1;
+ param = strstr(local_cmdline, "root=");
+ }
+ if (!param) {
+ char *old_param;
+ memcpy(temp_cmdline, dt, len);
+ param = strstr(temp_cmdline, "root=");
+ if (param) {
+ old_param = strtok(param, " ");
+ if (cmd_len != 0)
+ strcat(local_cmdline, " ");
+ strcat(local_cmdline, old_param);
+ }
+ }
+ strcat(local_cmdline, " ");
+ cmd_len = strlen(local_cmdline);
+ cmd_len = cmd_len + 1;
+ memcpy(dt, local_cmdline, cmd_len);
+ len = cmd_len;
+ *dt_len = cmd_len;
+
+ dbgprintf("Modified cmdline:%s\n", local_cmdline);
+
+ }
+
+ dt += (len + 3)/4;
+ if (!strcmp(dp->d_name, "reg") && usablemem_rgns.size)
+ add_usable_mem_property(fd, len);
+ close(fd);
+ }
+
+ fn[0] = '\0';
+ checkprop(pathname, NULL, 0);
+}
+
+/*
+ * Compare function used to sort the device-tree directories
+ * This function will be passed to scandir.
+ */
+static int comparefunc(const void *dentry1, const void *dentry2)
+{
+ char *str1 = (*(struct dirent **)dentry1)->d_name;
+ char *str2 = (*(struct dirent **)dentry2)->d_name;
+ char *p1, *p2;
+ int res = 0, max_len;
+
+ /*
+ * strcmp scans from left to right and fails to idetify for some
+ * strings such as memory@10000000 and memory@f000000.
+ * Therefore, we get the wrong sorted order like memory@10000000 and
+ * memory@f000000.
+ */
+ if ((p1 = strchr(str1, '@')) && (p2 = strchr(str2, '@'))) {
+ max_len = max(p1 - str1, p2 - str2);
+ if ((res = strncmp(str1, str2, max_len)) == 0) {
+ /* prefix is equal - compare part after '@' by length */
+ p1++; p2++;
+ res = strlen(p1) - strlen(p2);
+ if (res == 0)
+ /* equal length, compare by strcmp() */
+ res = strcmp(p1,p2);
+ }
+ } else {
+ res = strcmp(str1, str2);
+ }
+
+ return res;
+}
+
+/*
+ * put a node (directory) in the property structure. first properties
+ * then children.
+ */
+static void putnode(void)
+{
+ char *dn;
+ struct dirent *dp;
+ char *basename;
+ struct dirent **namelist;
+ int numlist, i;
+ struct stat statbuf;
+
+ numlist = scandir(pathname, &namelist, 0, comparefunc);
+ if (numlist < 0)
+ die("unrecoverable error: could not scan \"%s\": %s\n",
+ pathname, strerror(errno));
+ if (numlist == 0)
+ die("unrecoverable error: no directory entries in \"%s\"",
+ pathname);
+
+ basename = strrchr(pathname, '/') + 1;
+
+ *dt++ = 1;
+ strcpy((void *)dt, *basename ? basename : "");
+ dt += strlen((void *)dt) / sizeof(unsigned) + 1;
+
+ strcat(pathname, "/");
+ dn = pathname + strlen(pathname);
+
+ putprops(dn, namelist, numlist);
+
+ /*
+ * Add initrd entries to the second kernel
+ * if
+ * a) a ramdisk is specified in cmdline
+ * OR
+ * b) reuseinitrd is specified and a initrd is
+ * used by the kernel.
+ *
+ */
+ if ((ramdisk || (initrd_base && reuse_initrd))
+ && !strcmp(basename, "chosen/")) {
+ int len = 8;
+ unsigned long long initrd_end;
+ *dt++ = 3;
+ *dt++ = len;
+ *dt++ = propnum("linux,initrd-start");
+
+ memcpy(dt, &initrd_base, len);
+ dt += (len + 3)/4;
+
+ len = 8;
+ *dt++ = 3;
+ *dt++ = len;
+ *dt++ = propnum("linux,initrd-end");
+
+ initrd_end = initrd_base + initrd_size;
+
+ memcpy(dt, &initrd_end, len);
+ dt += (len + 3)/4;
+ /* reserve the existing initrd image in case of reuse_initrd */
+ if (initrd_base && initrd_size && reuse_initrd)
+ reserve(initrd_base, initrd_size);
+ }
+
+ for (i = 0; i < numlist; i++) {
+ dp = namelist[i];
+ strcpy(dn, dp->d_name);
+ free(namelist[i]);
+
+ if (!strcmp(dn, ".") || !strcmp(dn, ".."))
+ continue;
+
+ if (lstat(pathname, &statbuf))
+ die("unrecoverable error: could not stat \"%s\": %s\n",
+ pathname, strerror(errno));
+
+ if (S_ISDIR(statbuf.st_mode))
+ putnode();
+ }
+
+ *dt++ = 2;
+ dn[-1] = '\0';
+ free(namelist);
+}
+
+int create_flatten_tree(struct kexec_info *info, unsigned char **bufp,
+ unsigned long *sizep, char *cmdline)
+{
+ unsigned long len;
+ unsigned long tlen;
+ unsigned char *buf;
+ unsigned long me;
+
+ me = 0;
+
+ strcpy(pathname, "/proc/device-tree/");
+
+ dt = dtstruct;
+
+ if (cmdline)
+ strcpy(local_cmdline, cmdline);
+
+ putnode();
+ *dt++ = 9;
+
+ len = _ALIGN(sizeof(bb[0]), 8);
+
+ bb->off_mem_rsvmap = len;
+
+ for (len = 1; mem_rsrv[len]; len += 2)
+ ;
+ len += 3;
+ len *= sizeof(mem_rsrv[0]);
+
+ bb->off_dt_struct = bb->off_mem_rsvmap + len;
+
+ len = dt - dtstruct;
+ len *= sizeof(unsigned);
+ bb->dt_struct_size = len;
+ bb->off_dt_strings = bb->off_dt_struct + len;
+
+ len = propnum("");
+ bb->dt_strings_size = len;
+ len = _ALIGN(len, 4);
+ bb->totalsize = bb->off_dt_strings + len;
+
+ bb->magic = 0xd00dfeed;
+ bb->version = 17;
+ bb->last_comp_version = 16;
+
+ reserve(me, bb->totalsize); /* patched later in kexec_load */
+
+ buf = (unsigned char *) malloc(bb->totalsize);
+ *bufp = buf;
+ memcpy(buf, bb, bb->off_mem_rsvmap);
+ tlen = bb->off_mem_rsvmap;
+ memcpy(buf+tlen, mem_rsrv, bb->off_dt_struct - bb->off_mem_rsvmap);
+ tlen = tlen + (bb->off_dt_struct - bb->off_mem_rsvmap);
+ memcpy(buf+tlen, dtstruct, bb->off_dt_strings - bb->off_dt_struct);
+ tlen = tlen + (bb->off_dt_strings - bb->off_dt_struct);
+ memcpy(buf+tlen, propnames, bb->totalsize - bb->off_dt_strings);
+ tlen = tlen + bb->totalsize - bb->off_dt_strings;
+ *sizep = tlen;
+ return 0;
+}
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