On Thu, Jun 02, 2016 at 08:47:20PM +0300, Pantelis Antoniou wrote:
> Introduce a new magic number for dynamic plugin objects,
> which is enabled by selecting dtbo/input output options.
>
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
So, I don't think we should need an explicit -I dtbo or -O dtbo.
Instead we should be able to autoselect the right magic number based
on the presence of the /plugin/ flag. In the other direction we
should be able to set the equivalent of the /plugin/ flag based on the
magic number.
> ---
> Documentation/manual.txt | 8 ++++++++
> dtc.c | 14 +++++++++++---
> dtc.h | 4 ++--
> fdtdump.c | 2 +-
> flattree.c | 11 ++++++-----
> libfdt/fdt.c | 2 +-
> libfdt/fdt.h | 3 ++-
> tests/mangle-layout.c | 7 ++++---
> 8 files changed, 35 insertions(+), 16 deletions(-)
>
> diff --git a/Documentation/manual.txt b/Documentation/manual.txt
> index 398de32..6d2811b 100644
> --- a/Documentation/manual.txt
> +++ b/Documentation/manual.txt
> @@ -60,6 +60,9 @@ The currently supported Input Formats are:
> - "dtb": "blob" format. A flattened device-tree block with
> header in one binary blob.
>
> + - "dtbo" : "blob" format. Identical with "dtb" but meant
> + for use with dynamic-device tree objects.
> +
> - "dts": "source" format. A text file containing a "source"
> for a device-tree.
>
> @@ -71,6 +74,8 @@ The currently supported Output Formats are:
>
> - "dtb": "blob" format
>
> + - "dtbo": "blob" format - for dynamic device tree objects/overlays
> +
> - "dts": "source" format
>
> - "asm": assembly language file. A file that can be sourced
> @@ -78,6 +83,9 @@ The currently supported Output Formats are:
> then simply be added to your Makefile. Additionally, the
> assembly file exports some symbols that can be used.
>
> + - "asmo": assembly language file for dynamic device tree objects/overlays.
> + Identical to "asm" for most purposes.
> +
>
> 3) Command Line
>
> diff --git a/dtc.c b/dtc.c
> index 1c1f88f..43ba19d 100644
> --- a/dtc.c
> +++ b/dtc.c
> @@ -127,6 +127,8 @@ static const char *guess_type_by_name(const char *fname, const char *fallback)
> return "dts";
> if (!strcasecmp(s, ".dtb"))
> return "dtb";
> + if (!strcasecmp(s, ".dtbo"))
> + return "dtbo";
> return fallback;
> }
>
> @@ -157,6 +159,8 @@ static const char *guess_input_format(const char *fname, const char *fallback)
> magic = fdt32_to_cpu(magic);
> if (magic == FDT_MAGIC)
> return "dtb";
> + if (magic == FDT_MAGIC_DTBO)
> + return "dtbo";
>
> return guess_type_by_name(fname, fallback);
> }
> @@ -285,7 +289,7 @@ int main(int argc, char *argv[])
> dti = dt_from_source(arg);
> else if (streq(inform, "fs"))
> dti = dt_from_fs(arg);
> - else if(streq(inform, "dtb"))
> + else if (streq(inform, "dtb") || streq(inform, "dtbo"))
> dti = dt_from_blob(arg);
> else
> die("Unknown input format \"%s\"\n", inform);
> @@ -319,9 +323,13 @@ int main(int argc, char *argv[])
> if (streq(outform, "dts")) {
> dt_to_source(outf, dti);
> } else if (streq(outform, "dtb")) {
> - dt_to_blob(outf, dti, outversion);
> + dt_to_blob(outf, dti, FDT_MAGIC, outversion);
> + } else if (streq(outform, "dtbo")) {
> + dt_to_blob(outf, dti, FDT_MAGIC_DTBO, outversion);
> } else if (streq(outform, "asm")) {
> - dt_to_asm(outf, dti, outversion);
> + dt_to_asm(outf, dti, FDT_MAGIC, outversion);
> + } else if (streq(outform, "asmo")) {
> + dt_to_asm(outf, dti, FDT_MAGIC_DTBO, outversion);
> } else if (streq(outform, "null")) {
> /* do nothing */
> } else {
> diff --git a/dtc.h b/dtc.h
> index 040f8d4..fa66dca 100644
> --- a/dtc.h
> +++ b/dtc.h
> @@ -266,8 +266,8 @@ void process_checks(bool force, struct dt_info *dti);
>
> /* Flattened trees */
>
> -void dt_to_blob(FILE *f, struct dt_info *dti, int version);
> -void dt_to_asm(FILE *f, struct dt_info *dti, int version);
> +void dt_to_blob(FILE *f, struct dt_info *dti, fdt32_t magic, int version);
> +void dt_to_asm(FILE *f, struct dt_info *dti, fdt32_t magic, int version);
>
> struct dt_info *dt_from_blob(const char *fname);
>
> diff --git a/fdtdump.c b/fdtdump.c
> index 95a6a20..fa5a050 100644
> --- a/fdtdump.c
> +++ b/fdtdump.c
> @@ -199,7 +199,7 @@ int main(int argc, char *argv[])
> p = memchr(p, smagic[0], endp - p - 4);
> if (!p)
> break;
> - if (fdt_magic(p) == FDT_MAGIC) {
> + if (fdt_magic(p) == FDT_MAGIC || fdt_magic(p) == FDT_MAGIC_DTBO) {
> /* try and validate the main struct */
> off_t this_len = endp - p;
> fdt32_t max_version = 17;
> diff --git a/flattree.c b/flattree.c
> index 45fcb04..59bdc7d 100644
> --- a/flattree.c
> +++ b/flattree.c
> @@ -335,6 +335,7 @@ static struct data flatten_reserve_list(struct reserve_info *reservelist,
> }
>
> static void make_fdt_header(struct fdt_header *fdt,
> + fdt32_t magic,
> struct version_info *vi,
> int reservesize, int dtsize, int strsize,
> int boot_cpuid_phys)
> @@ -345,7 +346,7 @@ static void make_fdt_header(struct fdt_header *fdt,
>
> memset(fdt, 0xff, sizeof(*fdt));
>
> - fdt->magic = cpu_to_fdt32(FDT_MAGIC);
> + fdt->magic = cpu_to_fdt32(magic);
> fdt->version = cpu_to_fdt32(vi->version);
> fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version);
>
> @@ -366,7 +367,7 @@ static void make_fdt_header(struct fdt_header *fdt,
> fdt->size_dt_struct = cpu_to_fdt32(dtsize);
> }
>
> -void dt_to_blob(FILE *f, struct dt_info *dti, int version)
> +void dt_to_blob(FILE *f, struct dt_info *dti, fdt32_t magic, int version)
> {
> struct version_info *vi = NULL;
> int i;
> @@ -390,7 +391,7 @@ void dt_to_blob(FILE *f, struct dt_info *dti, int version)
> reservebuf = flatten_reserve_list(dti->reservelist, vi);
>
> /* Make header */
> - make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len,
> + make_fdt_header(&fdt, magic, vi, reservebuf.len, dtbuf.len, strbuf.len,
> dti->boot_cpuid_phys);
>
> /*
> @@ -460,7 +461,7 @@ static void dump_stringtable_asm(FILE *f, struct data strbuf)
> }
> }
>
> -void dt_to_asm(FILE *f, struct dt_info *dti, int version)
> +void dt_to_asm(FILE *f, struct dt_info *dti, fdt32_t magic, int version)
> {
> struct version_info *vi = NULL;
> int i;
> @@ -832,7 +833,7 @@ struct dt_info *dt_from_blob(const char *fname)
> }
>
> magic = fdt32_to_cpu(magic);
> - if (magic != FDT_MAGIC)
> + if (magic != FDT_MAGIC && magic != FDT_MAGIC_DTBO)
> die("Blob has incorrect magic number\n");
>
> rc = fread(&totalsize, sizeof(totalsize), 1, f);
> diff --git a/libfdt/fdt.c b/libfdt/fdt.c
> index 22286a1..28d422c 100644
> --- a/libfdt/fdt.c
> +++ b/libfdt/fdt.c
> @@ -57,7 +57,7 @@
>
> int fdt_check_header(const void *fdt)
> {
> - if (fdt_magic(fdt) == FDT_MAGIC) {
> + if (fdt_magic(fdt) == FDT_MAGIC || fdt_magic(fdt) == FDT_MAGIC_DTBO) {
> /* Complete tree */
> if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
> return -FDT_ERR_BADVERSION;
> diff --git a/libfdt/fdt.h b/libfdt/fdt.h
> index 526aedb..493cd55 100644
> --- a/libfdt/fdt.h
> +++ b/libfdt/fdt.h
> @@ -55,7 +55,7 @@
> #ifndef __ASSEMBLY__
>
> struct fdt_header {
> - fdt32_t magic; /* magic word FDT_MAGIC */
> + fdt32_t magic; /* magic word FDT_MAGIC[|_DTBO] */
> fdt32_t totalsize; /* total size of DT block */
> fdt32_t off_dt_struct; /* offset to structure */
> fdt32_t off_dt_strings; /* offset to strings */
> @@ -93,6 +93,7 @@ struct fdt_property {
> #endif /* !__ASSEMBLY */
>
> #define FDT_MAGIC 0xd00dfeed /* 4: version, 4: total size */
> +#define FDT_MAGIC_DTBO 0xd00dfdb0 /* DTBO magic */
> #define FDT_TAGSIZE sizeof(fdt32_t)
>
> #define FDT_BEGIN_NODE 0x1 /* Start node: full name */
> diff --git a/tests/mangle-layout.c b/tests/mangle-layout.c
> index a76e51e..d29ebc6 100644
> --- a/tests/mangle-layout.c
> +++ b/tests/mangle-layout.c
> @@ -42,7 +42,8 @@ static void expand_buf(struct bufstate *buf, int newsize)
> buf->size = newsize;
> }
>
> -static void new_header(struct bufstate *buf, int version, const void *fdt)
> +static void new_header(struct bufstate *buf, fdt32_t magic, int version,
> + const void *fdt)
> {
> int hdrsize;
>
> @@ -56,7 +57,7 @@ static void new_header(struct bufstate *buf, int version, const void *fdt)
> expand_buf(buf, hdrsize);
> memset(buf->buf, 0, hdrsize);
>
> - fdt_set_magic(buf->buf, FDT_MAGIC);
> + fdt_set_magic(buf->buf, magic);
> fdt_set_version(buf->buf, version);
> fdt_set_last_comp_version(buf->buf, 16);
> fdt_set_boot_cpuid_phys(buf->buf, fdt_boot_cpuid_phys(fdt));
> @@ -145,7 +146,7 @@ int main(int argc, char *argv[])
> if (fdt_version(fdt) < 17)
> CONFIG("Input tree must be v17");
>
> - new_header(&buf, version, fdt);
> + new_header(&buf, FDT_MAGIC, version, fdt);
>
> while (*blockorder) {
> add_block(&buf, version, *blockorder, fdt);
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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