[PATCH 8/15] bootwrapper: convert flatdevtree to version 16
Milton Miller
miltonm at bga.com
Wed Jul 11 08:10:47 EST 2007
kexec-tools still produces a version 2 device tree, while the
libraries in the wrapper only support version 16 and later.
Add a routine to convert a v2 flat device tree to a v16 one inplace
by inserting OF_DT_NOP and chomping full path. Make space for new
headers by moving and then chomping the OF_DT_NOPs.
Signed-off-by: Milton Miller <miltonm at bga.com>
---
Rediffed Makefile
Index: work.git/arch/powerpc/boot/flatdevtree_conv.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ work.git/arch/powerpc/boot/flatdevtree_conv.c 2007-07-10 16:08:20.000000000 -0500
@@ -0,0 +1,280 @@
+/*
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright IBM Corporation 2007
+ *
+ * Authors: Milton Miller <miltonm at bga.com>
+ */
+#include "flatdevtree.h"
+#include "stdio.h"
+#include "ops.h"
+
+#define MIN_VERSION 2
+#define OUT_VERSION 16
+#define OUT_COMPAT 16
+
+#ifdef NO_CHECK
+static int check_v123_tree(u32 *start, u32 *limit)
+{
+ return 0;
+}
+#else
+/**
+ * check_v123_tree - check integrety of a version 1, 2, or 3 tree
+ * @start: the start of the device tree struct
+ * @limit: the end of the region for the struct
+ * structural checks on device_tree
+ */
+static int check_v123_tree(u32 *start, u32 *limit)
+{
+ u32 len;
+ int depth = 0;
+ u32 *dtp = start;
+
+ while (dtp < limit)
+ switch (*dtp) {
+ case OF_DT_END:
+ if (depth)
+ return -1;
+ return ++dtp - start;
+ case OF_DT_NOP:
+ dtp++;
+ break;
+ case OF_DT_END_NODE:
+ dtp++;
+ depth--;
+ break;
+ case OF_DT_BEGIN_NODE:
+ len = strlen((char *)(++dtp));
+ /* check path is suffix to previous? */
+ dtp += 1 + (len / 4);
+ depth++;
+ break;
+ case OF_DT_PROP:
+ len = dtp[1];
+ dtp += 3;
+ if ((len >= 8) && ((long)dtp & 4))
+ dtp++;
+ dtp += (len + 3) / 4;
+ break;
+ default:
+ return -1;
+ }
+ return -1; /* no OF_DT_END */
+}
+#endif
+
+/**
+ * nop_to_v16 - add %OF_DT_NOP to hide alignment differences
+ * @dtp: pointer to the beginning of the struct area to modify
+ * insert %OF_DT_NOP into the dt_struct @dtp to make it v16 from v1, 2, or 3.
+ */
+static int nop_to_v16(u32 *dtp)
+{
+ int nops = 0;
+ char *p, *s;
+ int len;
+ u32 *next;
+
+ while (*dtp != OF_DT_END)
+ switch (*dtp) {
+ case OF_DT_BEGIN_NODE:
+ /* v2 & v3 names are full path, v16+ is relative */
+ p = (char *)(++dtp);
+ len = strlen(p);
+ next = dtp + 1 + len / 4;
+
+ for (s = p + len; *s != '/'; s--)
+ if (s == p)
+ fatal("name %s has no '/'", p);
+
+ len -= s++ - p; /* not the slash but the nul */
+ memmove(p, s, len);
+ while (len % 4)
+ p[len++] = '\0';
+ dtp += len / 4;
+ while (dtp != next) {
+ *dtp++ = OF_DT_NOP;
+ nops++;
+ }
+ break;
+ case OF_DT_PROP:
+ /* convert from align_8 to align_4 via prefixing nop */
+ len = dtp[1];
+ if ((len >= 8) && !((long)dtp & 4)) {
+ memmove(dtp+1, dtp, 12);
+ *dtp++ = OF_DT_NOP;
+ nops++;
+ }
+ dtp += 3 + (len + 3)/4;
+ break;
+ default:
+ fatal("%s: unrecognised tag %d at %p\n", __FUNCTION__,
+ *dtp, dtp);
+ case OF_DT_NOP:
+ nops ++;
+ /* fall through */
+ case OF_DT_END_NODE:
+ dtp ++;
+ break;
+ }
+ return nops;
+}
+
+#if MIN_VERSION < 3 || OUT_VERSION > 16
+/**
+ * move_nops_fwd - move nops in a v16 dt_struct to the beginning
+ * @start - device tree starting address
+ * @count - number of %OF_DT_NOP cells to move
+ */
+static void move_nops_fwd(u32 *start, int count)
+{
+ u32 *dtp = start;
+ int len;
+ while (count)
+ switch (*dtp) {
+ case OF_DT_NOP:
+ memmove(start+1,start,(dtp-start) * 4);
+ *start++ = OF_DT_NOP;
+ dtp++;
+ count--;
+ break;
+ case OF_DT_END_NODE:
+ dtp++;
+ break;
+ case OF_DT_BEGIN_NODE:
+ len = strlen((char *)(++dtp));
+ dtp += 1 + len / 4;
+ break;
+ case OF_DT_PROP:
+ len = dtp[1];
+ dtp += 3 + (len + 3) / 4;
+ break;
+ case OF_DT_END:
+ fatal("Not enough nops -- need %d more\n", count);
+ return;
+ default:
+ fatal("%s: unknown tag %d at %p", __FUNCTION__, *dtp, dtp)
+ }
+}
+#endif
+
+/**
+ * conv_flattree_inplace upgrade the version of a boot_param_header
+ * @tree: pointer to the device tree header to convert
+ *
+ * Converts a v1, 2, 3 device tree (of at least MIN_VERSION)
+ * in place to OUT_VERSION (16) format, usable by flatdevtree.c
+ */
+void conv_flattree_inplace(struct boot_param_header *tree)
+{
+ u32 *dtp;
+ u32 need = 0, nops;
+ int slen;
+
+ if (tree->magic != OF_DT_HEADER)
+ fatal("%s: no magic", __FUNCTION__);
+
+ if (tree->last_comp_version > 3)
+ return; /* don't know what to do */
+
+ if (tree->version < MIN_VERSION) {
+ printf("%s: Warning: can't handle version %d tree\n",
+ __FUNCTION__, tree->version);
+ return;
+ }
+
+ if (tree->version < 2)
+ need++; /* boot_cpu_id */
+
+ if (tree->version < 3)
+ need++; /* dt_string_size */
+
+ if (OUT_VERSION > 16)
+ need++; /* dt_struct_size */
+
+ dtp = (void *)tree + tree->off_dt_struct;
+
+ slen = check_v123_tree(dtp, (void *)tree + tree->totalsize);
+ if (slen < 0)
+ fatal("device tree check failed\n");
+
+ nops = nop_to_v16(dtp);
+
+ if (need & 1) /* keep 8 byte alignment of mem reserve */
+ need++;
+
+ if (need > nops)
+ fatal("Didn't find enough space to add new header fields\n\r"
+ "(needed %d found %d tree %p)", need, nops, tree);
+
+ /* ok now compress the dtb struct */
+ move_nops_fwd(dtp, need);
+ dtp += need;
+
+ /*
+ * move mem_rsvmap and dt_strings if they are before dt_struct
+ * onto our nops . Adjust start addresses for the 3 sections.
+ */
+ if ((tree->off_mem_rsvmap < tree->off_dt_struct) ||
+ (tree->off_dt_strings < tree->off_dt_struct)) {
+ int start, end;
+ void *ptr;
+
+ if (tree->off_mem_rsvmap < tree->off_dt_strings)
+ start = tree->off_mem_rsvmap;
+ else
+ start = tree->off_dt_strings;
+
+ end = tree->off_dt_struct;
+ ptr = (void *)tree + start;
+
+ memmove(ptr + 4 * need, ptr, end - start);
+
+ if (tree->off_mem_rsvmap < tree->off_dt_struct)
+ tree->off_mem_rsvmap += 4 * need;
+ if (tree->off_dt_strings < tree->off_dt_struct)
+ tree->off_dt_strings += 4 * need;
+ }
+ tree->off_dt_struct += 4 * need;
+
+ /* ok now we have space to extend the header. */
+ if (tree->version < 2 && MIN_VERSION < 2) {
+ tree->boot_cpuid_phys = 0; /* default, caller can fix */
+ }
+
+ /* calculate size of dt_strings_size */
+ if (tree->version < 3 && MIN_VERSION < 3) {
+ int end = tree->totalsize;
+
+ if (tree->off_dt_strings < tree->off_mem_rsvmap)
+ end = tree->off_mem_rsvmap;
+
+ if ((tree->off_dt_strings < tree->off_dt_struct) &&
+ (end > tree->off_dt_struct))
+ end = tree->off_dt_struct;
+
+ tree->dt_strings_size = end - tree->off_dt_strings;
+ }
+
+#if OUT_VERSION > 16
+ tree->dt_struct_size = 4 * slen;
+#endif
+
+ tree->version = OUT_VERSION;
+ tree->last_comp_version = OUT_COMPAT;
+
+ return;
+}
Index: work.git/arch/powerpc/boot/Makefile
===================================================================
--- work.git.orig/arch/powerpc/boot/Makefile 2007-07-10 16:05:13.000000000 -0500
+++ work.git/arch/powerpc/boot/Makefile 2007-07-10 16:05:13.000000000 -0500
@@ -42,7 +42,7 @@ $(addprefix $(obj)/,$(zlib) gunzip_util.
$(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
src-wlib := string.S crt0.S stdio.c main.c flatdevtree.c flatdevtree_misc.c \
- marshal.c memranges.c kexec.c \
+ flatdevtree_conv.c marshal.c memranges.c kexec.c \
ns16550.c serial.c simple_alloc.c div64.S util.S \
gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \
44x.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c
Index: work.git/arch/powerpc/boot/ops.h
===================================================================
--- work.git.orig/arch/powerpc/boot/ops.h 2007-07-10 16:05:13.000000000 -0500
+++ work.git/arch/powerpc/boot/ops.h 2007-07-10 16:05:13.000000000 -0500
@@ -80,7 +80,10 @@ struct loader_info {
};
extern struct loader_info loader_info;
+struct boot_param_header;
+
void start(void);
+void conv_flattree_inplace(struct boot_param_header *tree);
int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device);
int serial_console_init(void);
int ns16550_console_init(void *devp, struct serial_console_data *scdp);
Index: work.git/arch/powerpc/boot/kexec.c
===================================================================
--- work.git.orig/arch/powerpc/boot/kexec.c 2007-07-10 16:05:13.000000000 -0500
+++ work.git/arch/powerpc/boot/kexec.c 2007-07-10 16:05:13.000000000 -0500
@@ -162,6 +162,7 @@ void kexec_platform_init(struct boot_par
move_slaves_up();
setup_initial_heap();
+ conv_flattree_inplace(dt_blob);
early_scan_flat_tree(dt_blob);
/* drivers can malloc and read the tree, but not realloc later
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