OpenWrt – Rev 1
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#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/magic.h>
#include <asm/mach-ar7/prom.h>
#define IMAGE_A_SIZE 0X3c0000
#define WRTP_PARTS 14
#define NSP_IMG_MAGIC_NUMBER le32_to_cpu(0x4D544443)
#define NSP_IMG_SECTION_TYPE_KERNEL (0x01)
#define NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT (0x02)
#define NSP_IMG_SECTION_TYPE_FILESYSTEM (0x03)
#define MAX_NUM_PARTITIONS 14
static int part_count=0;
static struct mtd_partition titan_parts[WRTP_PARTS];
struct nsp_img_hdr_head
{
unsigned int magic; /* Magic number to identify this image header */
unsigned int boot_offset; /* Offset from start of header to kernel code. */
unsigned int flags; /* Image flags. */
unsigned int hdr_version; /* Version of this header. */
unsigned int hdr_size; /* The complete size of all portions of the header */
unsigned int prod_id; /* This product id */
unsigned int rel_id; /* Which release this is */
unsigned int version; /* name-MMM.nnn.ooo-rxx => 0xMMnnooxx. See comment
below */
unsigned int image_size; /* Image size (including header) */
unsigned int info_offset; /* Offset from start of header to info block */
unsigned int sect_info_offset; /* Offset from start of header to section desc */
unsigned int chksum_offset; /* Offset from start of header to chksum block */
unsigned int pad1;
};
struct nsp_img_hdr_section_info
{
unsigned int num_sects; /* Number of section (and section desc blocks) in this image */
unsigned int sect_size; /* Size of a SINGLE section_desc block */
unsigned int sections_offset; /* Offset to from start of header to the start of the section blocks */
};
/* There will be one of more of the following stuctures in the image header. Each
section will have one of these blocks. */
struct nsp_img_hdr_sections
{
unsigned int offset; /* Offset of section from start of NSP_IMG_HDR_HEAD */
unsigned int total_size; /* Size of section (including pad size.) */
unsigned int raw_size; /* Size of section only */
unsigned int flags; /* Section flags */
unsigned int chksum; /* Section checksum */
unsigned int type; /* Section type. What kind of info does this section describe */
char name[16]; /* Reference name for this section. */
};
static int titan_parse_env_address(char *env_name, unsigned int *flash_base,
unsigned int *flash_end)
{
char image_name[30];
char *env_ptr;
char *base_ptr;
char *end_ptr;
char * string_ptr;
/* Get the image variable */
env_ptr = prom_getenv(env_name);
if(!env_ptr){
printk("titan: invalid env name, %s.\n", env_name);
return -1; /* Error, no image variable */
}
strncpy(image_name, env_ptr, 30);
image_name[29]=0;
string_ptr = image_name;
/* Extract the start and stop addresses of the partition */
base_ptr = strsep(&string_ptr, ",");
end_ptr = strsep(&string_ptr, ",");
if ((base_ptr == NULL) || (end_ptr == NULL)) {
printk("titan: Couldn't tokenize %s start,end.\n", image_name);
return -1;
}
*flash_base = (unsigned int) simple_strtol(base_ptr, NULL, 0);
*flash_end = (unsigned int) simple_strtol(end_ptr, NULL, 0);
if((!*flash_base) || (!*flash_end)) {
printk("titan: Unable to convert :%s: :%s: into start,end values.\n",
env_name, image_name);
return -1;
}
*flash_base &= 0x0fffffff;
*flash_end &= 0x0fffffff;
return 0;
}
static int titan_get_single_image(char *bootcfg_name, unsigned int *flash_base,
unsigned int *flash_end)
{
char *env_ptr;
char *base_ptr;
char *end_ptr;
char image_name[30];
char * string_ptr;
if(!bootcfg_name || !flash_base || !flash_end)
return -1;
env_ptr = prom_getenv(bootcfg_name);
if(!env_ptr){
printk("titan: %s variable not found.\n", bootcfg_name);
return -1; /* Error, no bootcfg variable */
}
string_ptr = image_name;
/* Save off the image name */
strncpy(image_name, env_ptr, 30);
image_name[29]=0;
end_ptr=strsep(&string_ptr, "\"");
base_ptr=strsep(&string_ptr, "\""); /* Loose the last " */
if(!end_ptr || !base_ptr){
printk("titan: invalid bootcfg format, %s.\n", image_name);
return -1; /* Error, invalid bootcfg variable */
}
/* Now, parse the addresses */
return titan_parse_env_address(base_ptr, flash_base, flash_end);
}
static void titan_add_partition(char * env_name, unsigned int flash_base, unsigned int flash_end)
{
titan_parts[part_count].name = env_name;
titan_parts[part_count].offset = flash_base;
titan_parts[part_count].size = flash_end-flash_base;
titan_parts[part_count].mask_flags = (strcmp(env_name, "bootloader")==0||
strcmp(env_name, "boot_env")==0 ||
strcmp(env_name, "full_image")==0 )?MTD_WRITEABLE:0;
part_count++;
}
int create_titan_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
{
struct nsp_img_hdr_head hdr;
struct nsp_img_hdr_section_info sect_info;
struct nsp_img_hdr_sections section;
unsigned int flash_base, flash_end;
unsigned int start, end;
char *name;
int i;
int total_sects=0;
size_t len;
/* Get the bootcfg env variable first */
if(titan_get_single_image("BOOTCFG", &flash_base, &flash_end)) {
/* Error, fallback */
return -1;
}
/* Get access to the header, and do some validation checks */
//hdr=(struct nsp_img_hdr_head*)flash_base;
mtd_read(master, flash_base, sizeof(struct nsp_img_hdr_head), &len, (uint8_t *)&hdr);
if(hdr.magic != NSP_IMG_MAGIC_NUMBER)
return -1; /* Not a single image */
mtd_read(master, flash_base + hdr.sect_info_offset, sizeof(struct nsp_img_hdr_section_info), &len, (uint8_t *)§_info);
/* Look for the root fs, and add it first. This way we KNOW where the rootfs is */
for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
mtd_read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)§ion);
/* Add only the root partition */
if(section.type != NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT){
continue;
}
start=flash_base + section.offset;
end=start + section.total_size;
titan_add_partition("root", start, end);
total_sects++;
}
for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
mtd_read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)§ion);
name=section.name;
if(section.type == NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT)
{
name = "rootfs";
start=flash_base + section.offset;
end=flash_end;
titan_add_partition(name, start, end);
total_sects++;
}
else if(section.type == NSP_IMG_SECTION_TYPE_KERNEL)
{
name = "kernel";
start=flash_base + section.offset;
end=start + section.total_size;
titan_add_partition(name, start, end);
total_sects++;
}
}
/* Next, lets add the single image */
titan_add_partition("primary_image", flash_base, flash_end);
total_sects++;
titan_add_partition("full_image", 0, master->size);
total_sects++;
if (!titan_parse_env_address("BOOTLOADER", &start, &end)){
titan_add_partition("bootloader", start, end);
total_sects++;
}
if (!titan_parse_env_address("boot_env", &start, &end)){
titan_add_partition("boot_env", start, end);
total_sects++;
}
*pparts = titan_parts;
return total_sects;
}