Enable the generation of symbol & fixup information for
usage with dynamic DT loading.
Passing the -@ option generates a __symbols__ node at the
root node of the resulting blob for any node labels used.
When using the /plugin/ tag all unresolved label references
be tracked in the __fixups__ node, while all local phandle
references will the tracked in the __local_fixups__ node.
This is sufficient to implement a dynamic DT object loader.
Signed-off-by: Pantelis Antoniou <pa...@antoniou-consulting.com>
---
Documentation/dt-object-internal.txt | 295 +++++++++++++++++++++++++++++++++++
Documentation/dts-format.txt | 7 +
Documentation/manual.txt | 8 +
checks.c | 120 +++++++++++++-
dtc-lexer.l | 5 +
dtc-parser.y | 23 ++-
dtc.c | 9 +-
dtc.h | 38 +++++
flattree.c | 139 +++++++++++++++++
9 files changed, 635 insertions(+), 9 deletions(-)
create mode 100644 Documentation/dt-object-internal.txt
diff --git a/Documentation/dt-object-internal.txt
b/Documentation/dt-object-internal.txt
new file mode 100644
index 0000000..a851721
--- /dev/null
+++ b/Documentation/dt-object-internal.txt
@@ -0,0 +1,295 @@
+Device Tree Dynamic Object format internals
+-------------------------------------------
+
+The Device Tree for most platforms is a static representation of
+the hardware capabilities. This is insufficient for many platforms
+that need to dynamically insert device tree fragments to the
+running kernel's live tree.
+
+This document explains the the device tree object format and the
+modifications made to the device tree compiler, which make it possible.
+
+1. Simplified Problem Definition
+--------------------------------
+
+Assume we have a platform which boots using this simplified device tree:
+
+---- foo.dts -----------------------------------------------------------------
+ /* FOO platform */
+ / {
+ compatible = "corp,foo";
+
+ /* shared resources */
+ res: res {
+ };
+
+ /* On chip peripherals */
+ ocp: ocp {
+ /* peripherals that are always instantiated */
+ peripheral1 { ... };
+ }
+ };
+---- foo.dts -----------------------------------------------------------------
+
+We have a number of peripherals that after probing (using some undefined
method)
+should result in different device tree configuration.
+
+We cannot boot with this static tree because due to the configuration of the
+foo platform there exist multiple conficting peripherals DT fragments.
+
+So for the bar peripheral we would have this:
+
+---- foo+bar.dts -------------------------------------------------------------
+ /* FOO platform + bar peripheral */
+ / {
+ compatible = "corp,foo";
+
+ /* shared resources */
+ res: res {
+ };
+
+ /* On chip peripherals */
+ ocp: ocp {
+ /* peripherals that are always instantiated */
+ peripheral1 { ... };
+
+ /* bar peripheral */
+ bar {
+ compatible = "corp,bar";
+ ... /* various properties and child nodes */
+ }
+ }
+ };
+---- foo+bar.dts -------------------------------------------------------------
+
+While for the baz peripheral we would have this:
+
+---- foo+baz.dts -------------------------------------------------------------
+ /* FOO platform + baz peripheral */
+ / {
+ compatible = "corp,foo";
+
+ /* shared resources */
+ res: res {
+ /* baz resources */
+ baz_res: res_baz { ... };
+ };
+
+ /* On chip peripherals */
+ ocp: ocp {
+ /* peripherals that are always instantiated */
+ peripheral1 { ... };
+
+ /* baz peripheral */
+ baz {
+ compatible = "corp,baz";
+ /* reference to another point in the tree */
+ ref-to-res = <&baz_res>;
+ ... /* various properties and child nodes */
+ }
+ }
+ };
+---- foo+baz.dts -------------------------------------------------------------
+
+We note that the baz case is more complicated, since the baz peripheral needs
to
+reference another node in the DT tree.
+
+2. Device Tree Object Format Requirements
+-----------------------------------------
+
+Since the device tree is used for booting a number of very different hardware
+platforms it is imperative that we tread very carefully.
+
+2.a) No changes to the Device Tree binary format. We cannot modify the tree
+format at all and all the information we require should be encoded using device
+tree itself. We can add nodes that can be safely ignored by both bootloaders
and
+the kernel.
+
+2.b) Changes to the DTS source format should be absolutely minimal, and should
+only be needed for the DT fragment definitions, and not the base boot DT.
+
+2.c) An explicit option should be used to instruct DTC to generate the required
+information needed for object resolution. Platforms that don't use the
+dynamic object format can safely ignore it.
+
+2.d) Finally, DT syntax changes should be kept to a minimum. It should be
+possible to express everything using the existing DT syntax.
+
+3. Implementation
+-----------------
+
+The basic unit of addressing in Device Tree is the phandle. Turns out it's
+relatively simple to extend the way phandles are generated and referenced
+so that it's possible to dynamically convert symbolic references (labels)
+to phandle values.
+
+We can roughly divide the operation into two steps.
+
+3.a) Compilation of the base board DTS file using the '-@' option
+generates a valid DT blob with an added __symbols__ node at the root node,
+containing a list of all nodes that are marked with a label.
+
+Using the foo.dts file above the following node will be generated;
+
+$ dtc -@ -O dtb -o foo.dtb -b 0 foo.dts
+$ fdtdump foo.dtb
+...
+/ {
+ ...
+ res {
+ ...
+ linux,phandle = <0x00000001>;
+ phandle = <0x00000001>;
+ ...
+ };
+ ocp {
+ ...
+ linux,phandle = <0x00000002>;
+ phandle = <0x00000002>;
+ ...
+ };
+ __symbols__ {
+ res="/res";
+ ocp="/ocp";
+ };
+};
+
+Notice that all the nodes that had a label have been recorded, and that
+phandles have been generated for them.
+
+This blob can be used to boot the board normally, the __symbols__ node will
+be safely ignored both by the bootloader and the kernel (the only loss will
+be a few bytes of memory and disk space).
+
+3.b) The Device Tree fragments must be compiled with the same option but they
+must also have a tag (/plugin/) that allows undefined references to labels
+that are not present at compilation time to be recorded so that the runtime
+loader can fix them.
+
+So the bar peripheral's DTS format would be of the form:
+
+/plugin/; /* allow undefined label references and record them */
+/ {
+ .... /* various properties for loader use; i.e. part id etc. */
+ fragment@0 {
+ target = <&ocp>;
+ __overlay__ {
+ /* bar peripheral */
+ bar {
+ compatible = "corp,bar";
+ ... /* various properties and child nodes */
+ }
+ };
+ };
+};
+
+Note that there's a target property that specifies the location where the
+contents of the overlay node will be placed, and it references the label
+in the foo.dts file.
+
+$ dtc -@ -O dtb -o bar.dtbo -b 0 bar.dts
+$ fdtdump bar.dtbo
+...
+/ {
+ ... /* properties */
+ fragment@0 {
+ target = <0xdeadbeef>;
+ __overlay__ {
+ bar {
+ compatible = "corp,bar";
+ ... /* various properties and child nodes */
+ }
+ };
+ };
+ __fixups__ {
+ ocp = "/fragment@0:target:0";
+ };
+};
+
+No __symbols__ has been generated (no label in bar.dts).
+Note that the target's ocp label is undefined, so the phandle handle
+value is filled with the illegal value '0xdeadbeef', while a __fixups__
+node has been generated, which marks the location in the tree where
+the label lookup should store the runtime phandle value of the ocp node.
+
+The format of the __fixups__ node entry is
+
+ <label> = "<local-full-path>:<property-name>:<offset>";
+
+<label> Is the label we're referring
+<local-full-path> Is the full path of the node the reference is
+<property-name> Is the name of the property containing the
+ reference
+<offset> The offset (in bytes) of where the property's
+ phandle value is located.
+
+Doing the same with the baz peripheral's DTS format is a little bit more
+involved, since baz contains references to local labels which require
+local fixups.
+
+/plugin/; /* allow undefined label references and record them */
+/ {
+ .... /* various properties for loader use; i.e. part id etc. */
+ fragment@0 {
+ target = <&res>;
+ __overlay__ {
+ /* baz resources */
+ baz_res: res_baz { ... };
+ };
+ };
+ fragment@1 {
+ target = <&ocp>;
+ __overlay__ {
+ /* baz peripheral */
+ baz {
+ compatible = "corp,baz";
+ /* reference to another point in the tree */
+ ref-to-res = <&baz_res>;
+ ... /* various properties and child nodes */
+ }
+ };
+ };
+};
+
+Note that &baz_res reference.
+
+$ dtc -@ -O dtb -o baz.dtbo -b 0 baz.dts
+$ fdtdump baz.dtbo
+...
+/ {
+ ... /* properties */
+ fragment@0 {
+ target = <0xdeadbeef>;
+ __overlay__ {
+ res_baz {
+ ....
+ linux,phandle = <0x00000001>;
+ phandle = <0x00000001>;
+ };
+ };
+ };
+ fragment@1 {
+ target = <0xdeadbeef>;
+ __overlay__ {
+ baz {
+ compatible = "corp,baz";
+ ... /* various properties and child nodes */
+ res=<0x00000001>;
+ }
+ };
+ };
+ __fixups__ {
+ res = "/fragment@0:target:0";
+ ocp = "/fragment@1:target:0";
+ };
+ __local_fixups__ {
+ fixup = </fragment@1/__overlay__/baz:res:0>;
+ };
+};
+
+This is similar to the bar case, but the reference of a local label by the
+baz node generates a __local_fixups__ entry that records the place that the
+local reference is being made. Since phandles are allocated starting at 1
+the run time loader must apply an offset to each phandle in every dynamic
+DT object loaded. The __local_fixups__ node records the place of every
+local reference so that the loader can apply the offset.
diff --git a/Documentation/dts-format.txt b/Documentation/dts-format.txt
index 41741df..4da515c 100644
--- a/Documentation/dts-format.txt
+++ b/Documentation/dts-format.txt
@@ -115,7 +115,14 @@ Version 1 DTS files have the overall layout:
* C style (/* ... */) and C++ style (// ...) comments are supported.
+Device Tree Objects
+-------------------
+Using the plugin tag enables dynamic tree objects.
+
+ /plugin/;
+
+For the full details please see Documentation/dt-object-internal.txt
-- David Gibson <da...@gibson.dropbear.id.au>
-- Yoder Stuart <stuart.yo...@freescale.com>
diff --git a/Documentation/manual.txt b/Documentation/manual.txt
index 65c8540..d313715 100644
--- a/Documentation/manual.txt
+++ b/Documentation/manual.txt
@@ -133,6 +133,14 @@ Options:
By default the most recent version is generated.
Relevant for dtb and asm output only.
+ -@
+ Dynamic resolution mode. For non /plugin/ compilations generate
+ a __symbols__ node containing a list of all nodes with a label.
+ When /plugin/ is used, unresolved references are recorded in
+ a __fixups__ node, while local phandle references are recorded
+ in a __local_fixups__ node.
+ See Documentation/dt-object-internal.txt
+
The <output_version> defines what version of the "blob" format will be
generated. Supported versions are 1, 2, 3, 16 and 17. The default is
diff --git a/checks.c b/checks.c
index ee96a25..970c0a3 100644
--- a/checks.c
+++ b/checks.c
@@ -457,22 +457,93 @@ static void fixup_phandle_references(struct check *c,
struct node *dt,
struct node *node, struct property *prop)
{
struct marker *m = prop->val.markers;
+ struct fixup *f, **fp;
+ struct fixup_entry *fe, **fep;
struct node *refnode;
cell_t phandle;
+ int has_phandle_refs;
+
+ has_phandle_refs = 0;
+ for_each_marker_of_type(m, REF_PHANDLE) {
+ has_phandle_refs = 1;
+ break;
+ }
+
+ if (!has_phandle_refs)
+ return;
for_each_marker_of_type(m, REF_PHANDLE) {
assert(m->offset + sizeof(cell_t) <= prop->val.len);
refnode = get_node_by_ref(dt, m->ref);
- if (! refnode) {
+ if (!refnode && !symbol_fixup_support) {
FAIL(c, "Reference to non-existent node or label
\"%s\"\n",
- m->ref);
+ m->ref);
continue;
}
- phandle = get_node_phandle(dt, refnode);
- *((cell_t *)(prop->val.val + m->offset)) =
cpu_to_fdt32(phandle);
+ if (!refnode) {
+ /* allocate fixup entry */
+ fe = xmalloc(sizeof(*fe));
+
+ fe->node = node;
+ fe->prop = prop;
+ fe->offset = m->offset;
+ fe->next = NULL;
+
+ /* search for an already existing fixup */
+ for_each_fixup(dt, f)
+ if (strcmp(f->ref, m->ref) == 0)
+ break;
+
+ /* no fixup found, add new */
+ if (f == NULL) {
+ f = xmalloc(sizeof(*f));
+ f->ref = m->ref;
+ f->entries = NULL;
+ f->next = NULL;
+
+ /* add it to the tree */
+ fp = &dt->fixups;
+ while (*fp)
+ fp = &(*fp)->next;
+ *fp = f;
+ }
+
+ /* and now append fixup entry */
+ fep = &f->entries;
+ while (*fep)
+ fep = &(*fep)->next;
+ *fep = fe;
+
+ /* mark the entry as unresolved */
+ phandle = 0xdeadbeef;
+ } else {
+ phandle = get_node_phandle(dt, refnode);
+
+ /* if it's a plugin, we need to record it */
+ if (symbol_fixup_support && dt->is_plugin) {
+
+ /* allocate a new local fixup entry */
+ fe = xmalloc(sizeof(*fe));
+
+ fe->node = node;
+ fe->prop = prop;
+ fe->offset = m->offset;
+ fe->next = NULL;
+
+ /* append it to the local fixups */
+ fep = &dt->local_fixups;
+ while (*fep)
+ fep = &(*fep)->next;
+ *fep = fe;
+ }
+ }
+
+ *((cell_t *)(prop->val.val + m->offset)) =
+ cpu_to_fdt32(phandle);
}
+
}
ERROR(phandle_references, NULL, NULL, fixup_phandle_references, NULL,
&duplicate_node_names, &explicit_phandles);
@@ -651,6 +722,45 @@ static void
check_obsolete_chosen_interrupt_controller(struct check *c,
}
TREE_WARNING(obsolete_chosen_interrupt_controller, NULL);
+static void check_auto_label_phandles(struct check *c, struct node *dt,
+ struct node *node)
+{
+ struct label *l;
+ struct symbol *s, **sp;
+ int has_label;
+
+ if (!symbol_fixup_support)
+ return;
+
+ has_label = 0;
+ for_each_label(node->labels, l) {
+ has_label = 1;
+ break;
+ }
+
+ if (!has_label)
+ return;
+
+ /* force allocation of a phandle for this node */
+ (void)get_node_phandle(dt, node);
+
+ /* add the symbol */
+ for_each_label(node->labels, l) {
+
+ s = xmalloc(sizeof(*s));
+ s->label = l;
+ s->node = node;
+ s->next = NULL;
+
+ /* add it to the symbols list */
+ sp = &dt->symbols;
+ while (*sp)
+ sp = &((*sp)->next);
+ *sp = s;
+ }
+}
+NODE_WARNING(auto_label_phandles, NULL);
+
static struct check *check_table[] = {
&duplicate_node_names, &duplicate_property_names,
&node_name_chars, &node_name_format, &property_name_chars,
@@ -669,6 +779,8 @@ static struct check *check_table[] = {
&avoid_default_addr_size,
&obsolete_chosen_interrupt_controller,
+ &auto_label_phandles,
+
&always_fail,
};
diff --git a/dtc-lexer.l b/dtc-lexer.l
index 254d5af..2cef406 100644
--- a/dtc-lexer.l
+++ b/dtc-lexer.l
@@ -112,6 +112,11 @@ static int pop_input_file(void);
return DT_V1;
}
+<*>"/plugin/" {
+ DPRINT("Keyword: /plugin/\n");
+ return DT_PLUGIN;
+ }
+
<*>"/memreserve/" {
DPRINT("Keyword: /memreserve/\n");
BEGIN_DEFAULT();
diff --git a/dtc-parser.y b/dtc-parser.y
index f412460..e444acf 100644
--- a/dtc-parser.y
+++ b/dtc-parser.y
@@ -20,6 +20,7 @@
%{
#include <stdio.h>
+#include <inttypes.h>
#include "dtc.h"
#include "srcpos.h"
@@ -56,9 +57,11 @@ static unsigned char eval_char_literal(const char *s);
struct node *nodelist;
struct reserve_info *re;
uint64_t integer;
+ int is_plugin;
}
%token DT_V1
+%token DT_PLUGIN
%token DT_MEMRESERVE
%token DT_LSHIFT DT_RSHIFT DT_LE DT_GE DT_EQ DT_NE DT_AND DT_OR
%token DT_BITS
@@ -76,6 +79,7 @@ static unsigned char eval_char_literal(const char *s);
%type <data> propdata
%type <data> propdataprefix
+%type <is_plugin> plugindecl
%type <re> memreserve
%type <re> memreserves
%type <array> arrayprefix
@@ -106,10 +110,23 @@ static unsigned char eval_char_literal(const char *s);
%%
sourcefile:
- DT_V1 ';' memreserves devicetree
+ DT_V1 ';' plugindecl memreserves devicetree
{
- the_boot_info = build_boot_info($3, $4,
- guess_boot_cpuid($4));
+ $5->is_plugin = $3;
+ $5->is_root = 1;
+ the_boot_info = build_boot_info($4, $5,
+ guess_boot_cpuid($5));
+ }
+ ;
+
+plugindecl:
+ /* empty */
+ {
+ $$ = 0;
+ }
+ | DT_PLUGIN ';'
+ {
+ $$ = 1;
}
;
diff --git a/dtc.c b/dtc.c
index a375683..30d9607 100644
--- a/dtc.c
+++ b/dtc.c
@@ -31,6 +31,7 @@ int reservenum; /* Number of memory reservation
slots */
int minsize; /* Minimum blob size */
int padsize; /* Additional padding to blob */
int phandle_format = PHANDLE_BOTH; /* Use linux,phandle or phandle
properties */
+int symbol_fixup_support = 0;
static void fill_fullpaths(struct node *tree, const char *prefix)
{
@@ -96,6 +97,8 @@ static void __attribute__ ((noreturn)) usage(void)
fprintf(stderr, "\t-W [no-]<checkname>\n");
fprintf(stderr, "\t-E [no-]<checkname>\n");
fprintf(stderr, "\t\t\tenable or disable warnings and errors\n");
+ fprintf(stderr, "\t-@\n");
+ fprintf(stderr, "\t\tSymbols and Fixups support\n");
exit(3);
}
@@ -118,7 +121,7 @@ int main(int argc, char *argv[])
minsize = 0;
padsize = 0;
- while ((opt = getopt(argc, argv, "hI:O:o:V:d:R:S:p:fqb:i:vH:sW:E:"))
+ while ((opt = getopt(argc, argv, "hI:O:o:V:d:R:S:p:fqb:i:vH:sW:E:@"))
!= EOF) {
switch (opt) {
case 'I':
@@ -183,7 +186,9 @@ int main(int argc, char *argv[])
case 'E':
parse_checks_option(false, true, optarg);
break;
-
+ case '@':
+ symbol_fixup_support = 1;
+ break;
case 'h':
default:
usage();
diff --git a/dtc.h b/dtc.h
index 3e42a07..0c8ecf6 100644
--- a/dtc.h
+++ b/dtc.h
@@ -54,6 +54,7 @@ extern int reservenum; /* Number of memory
reservation slots */
extern int minsize; /* Minimum blob size */
extern int padsize; /* Additional padding to blob */
extern int phandle_format; /* Use linux,phandle or phandle properties */
+extern int symbol_fixup_support;/* enable symbols & fixup support */
#define PHANDLE_LEGACY 0x1
#define PHANDLE_EPAPR 0x2
@@ -133,6 +134,25 @@ struct label {
struct label *next;
};
+struct fixup_entry {
+ int offset;
+ struct node *node;
+ struct property *prop;
+ struct fixup_entry *next;
+};
+
+struct fixup {
+ char *ref;
+ struct fixup_entry *entries;
+ struct fixup *next;
+};
+
+struct symbol {
+ struct label *label;
+ struct node *node;
+ struct symbol *next;
+};
+
struct property {
int deleted;
char *name;
@@ -159,6 +179,12 @@ struct node {
int addr_cells, size_cells;
struct label *labels;
+
+ int is_root;
+ int is_plugin;
+ struct fixup *fixups;
+ struct symbol *symbols;
+ struct fixup_entry *local_fixups;
};
#define for_each_label_withdel(l0, l) \
@@ -182,6 +208,18 @@ struct node {
for_each_child_withdel(n, c) \
if (!(c)->deleted)
+#define for_each_fixup(n, f) \
+ for ((f) = (n)->fixups; (f); (f) = (f)->next)
+
+#define for_each_fixup_entry(f, fe) \
+ for ((fe) = (f)->entries; (fe); (fe) = (fe)->next)
+
+#define for_each_symbol(n, s) \
+ for ((s) = (n)->symbols; (s); (s) = (s)->next)
+
+#define for_each_local_fixup_entry(n, fe) \
+ for ((fe) = (n)->local_fixups; (fe); (fe) = (fe)->next)
+
void add_label(struct label **labels, char *label);
void delete_labels(struct label **labels);
diff --git a/flattree.c b/flattree.c
index 665dad7..6237715 100644
--- a/flattree.c
+++ b/flattree.c
@@ -262,6 +262,12 @@ static void flatten_tree(struct node *tree, struct emitter
*emit,
struct property *prop;
struct node *child;
int seen_name_prop = 0;
+ struct symbol *sym;
+ struct fixup *f;
+ struct fixup_entry *fe;
+ char *name, *s;
+ const char *fullpath;
+ int namesz, nameoff, vallen;
if (tree->deleted)
return;
@@ -310,6 +316,139 @@ static void flatten_tree(struct node *tree, struct
emitter *emit,
flatten_tree(child, emit, etarget, strbuf, vi);
}
+ if (!symbol_fixup_support)
+ goto no_symbols;
+
+ /* add the symbol nodes (if any) */
+ if (tree->symbols) {
+
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__symbols__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ for_each_symbol(tree, sym) {
+
+ vallen = strlen(sym->node->fullpath);
+
+ nameoff = stringtable_insert(strbuf, sym->label->label);
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, sym->node->fullpath,
+ strlen(sym->node->fullpath));
+ emit->align(etarget, sizeof(cell_t));
+ }
+
+ emit->endnode(etarget, NULL);
+ }
+
+ /* add the fixup nodes */
+ if (tree->fixups) {
+
+ /* emit the external fixups */
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__fixups__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ for_each_fixup(tree, f) {
+
+ namesz = 0;
+ for_each_fixup_entry(f, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ namesz += strlen(fullpath) + 1;
+ namesz += strlen(fe->prop->name) + 1;
+ namesz += 32; /* space for :<number> + '\0' */
+ }
+
+ name = xmalloc(namesz);
+
+ s = name;
+ for_each_fixup_entry(f, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ snprintf(s, name + namesz - s, "%s:%s:%d",
+ fullpath,
+ fe->prop->name, fe->offset);
+ s += strlen(s) + 1;
+ }
+
+ nameoff = stringtable_insert(strbuf, f->ref);
+ vallen = s - name - 1;
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, name, vallen);
+ emit->align(etarget, sizeof(cell_t));
+
+ free(name);
+ }
+
+ emit->endnode(etarget, tree->labels);
+ }
+
+ /* add the local fixup property */
+ if (tree->local_fixups) {
+
+ /* emit the external fixups */
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__local_fixups__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ namesz = 0;
+ for_each_local_fixup_entry(tree, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ namesz += strlen(fullpath) + 1;
+ namesz += strlen(fe->prop->name) + 1;
+ namesz += 32; /* space for :<number> + '\0' */
+ }
+
+ name = xmalloc(namesz);
+
+ s = name;
+ for_each_local_fixup_entry(tree, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ snprintf(s, name + namesz - s, "%s:%s:%d",
+ fullpath, fe->prop->name,
+ fe->offset);
+ s += strlen(s) + 1;
+ }
+
+ nameoff = stringtable_insert(strbuf, "fixup");
+ vallen = s - name - 1;
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, name, vallen);
+ emit->align(etarget, sizeof(cell_t));
+
+ free(name);
+
+ emit->endnode(etarget, tree->labels);
+ }
+
+no_symbols:
emit->endnode(etarget, tree->labels);
}
--
1.7.12
_______________________________________________
devicetree-discuss mailing list
devicetree-discuss@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/devicetree-discuss
