Re: [PATCH v7 2/5] DTBO magic and dtbo format options

[David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>]

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On Tue, May 24, 2016 at 08:50:36PM +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-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>

Apart from one nit this is ready to go.

> ---
>  Documentation/manual.txt |  7 +++++++
>  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, 34 insertions(+), 16 deletions(-)
> 
> diff --git a/Documentation/manual.txt b/Documentation/manual.txt
> index 398de32..f64c4f4 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 objects
> +
>       - "dts": "source" format
>  
>       - "asm": assembly language file.  A file that can be sourced
> @@ -78,6 +83,8 @@ 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 objects. Identical to "asm"

Please spell out dynamic device-tree object/overlay here, just
"object" is too vague.

>  
>  3) Command Line
>  
> diff --git a/dtc.c b/dtc.c
> index 5fa23c4..63c2c9c 100644
> --- a/dtc.c
> +++ b/dtc.c
> @@ -117,6 +117,8 @@ 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;
>  }
>  
> @@ -147,6 +149,8 @@ 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);
>  }
> @@ -275,7 +279,7 @@ int main(int argc, char *argv[])
>  		bi = dt_from_source(arg);
>  	else if (streq(inform, "fs"))
>  		bi = dt_from_fs(arg);
> -	else if(streq(inform, "dtb"))
> +	else if(streq(inform, "dtb") || streq(inform, "dtbo"))
>  		bi = dt_from_blob(arg);
>  	else
>  		die("Unknown input format \"%s\"\n", inform);
> @@ -306,9 +310,13 @@ int main(int argc, char *argv[])
>  	if (streq(outform, "dts")) {
>  		dt_to_source(outf, bi);
>  	} else if (streq(outform, "dtb")) {
> -		dt_to_blob(outf, bi, outversion);
> +		dt_to_blob(outf, bi, FDT_MAGIC, outversion);
> +	} else if (streq(outform, "dtbo")) {
> +		dt_to_blob(outf, bi, FDT_MAGIC_DTBO, outversion);
>  	} else if (streq(outform, "asm")) {
> -		dt_to_asm(outf, bi, outversion);
> +		dt_to_asm(outf, bi, FDT_MAGIC, outversion);
> +	} else if (streq(outform, "asmo")) {
> +		dt_to_asm(outf, bi, FDT_MAGIC_DTBO, outversion);
>  	} else if (streq(outform, "null")) {
>  		/* do nothing */
>  	} else {
> diff --git a/dtc.h b/dtc.h
> index 56212c8..9d7f2d6 100644
> --- a/dtc.h
> +++ b/dtc.h
> @@ -252,8 +252,8 @@ void process_checks(bool force, struct boot_info *bi);
>  
>  /* Flattened trees */
>  
> -void dt_to_blob(FILE *f, struct boot_info *bi, int version);
> -void dt_to_asm(FILE *f, struct boot_info *bi, int version);
> +void dt_to_blob(FILE *f, struct boot_info *bi, fdt32_t magic, int version);
> +void dt_to_asm(FILE *f, struct boot_info *bi, fdt32_t magic, int version);
>  
>  struct boot_info *dt_from_blob(const char *fname);
>  
> diff --git a/fdtdump.c b/fdtdump.c
> index 9183555..11c2b8d 100644
> --- a/fdtdump.c
> +++ b/fdtdump.c
> @@ -306,7 +306,7 @@ 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 ec14954..64ed375 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 boot_info *bi, int version)
> +void dt_to_blob(FILE *f, struct boot_info *bi, fdt32_t magic, int version)
>  {
>  	struct version_info *vi = NULL;
>  	int i;
> @@ -390,7 +391,7 @@ void dt_to_blob(FILE *f, struct boot_info *bi, int version)
>  	reservebuf = flatten_reserve_list(bi->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,
>  			bi->boot_cpuid_phys);
>  
>  	/*
> @@ -460,7 +461,7 @@ static void dump_stringtable_asm(FILE *f, struct data strbuf)
>  	}
>  }
>  
> -void dt_to_asm(FILE *f, struct boot_info *bi, int version)
> +void dt_to_asm(FILE *f, struct boot_info *bi, fdt32_t magic, int version)
>  {
>  	struct version_info *vi = NULL;
>  	int i;
> @@ -832,7 +833,7 @@ struct boot_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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