u-boot/common/ft_build.c

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/*
* OF flat tree builder
*/
#include <common.h>
#include <malloc.h>
#include <environment.h>
#ifdef CONFIG_OF_FLAT_TREE
#include <asm/errno.h>
#include <stddef.h>
#include <ft_build.h>
/* align addr on a size boundary - adjust address up if needed -- Cort */
#define _ALIGN(addr,size) (((addr)+(size)-1)&(~((size)-1)))
static void ft_put_word(struct ft_cxt *cxt, u32 v)
{
if (cxt->overflow) /* do nothing */
return;
/* check for overflow */
if (cxt->p + 4 > cxt->pstr) {
cxt->overflow = 1;
return;
}
*(u32 *) cxt->p = cpu_to_be32(v);
cxt->p += 4;
}
static inline void ft_put_bin(struct ft_cxt *cxt, const void *data, int sz)
{
u8 *p;
if (cxt->overflow) /* do nothing */
return;
/* next pointer pos */
p = (u8 *) _ALIGN((unsigned long)cxt->p + sz, 4);
/* check for overflow */
if (p > cxt->pstr) {
cxt->overflow = 1;
return;
}
memcpy(cxt->p, data, sz);
if ((sz & 3) != 0)
memset(cxt->p + sz, 0, 4 - (sz & 3));
cxt->p = p;
}
void ft_begin_node(struct ft_cxt *cxt, const char *name)
{
ft_put_word(cxt, OF_DT_BEGIN_NODE);
ft_put_bin(cxt, name, strlen(name) + 1);
}
void ft_end_node(struct ft_cxt *cxt)
{
ft_put_word(cxt, OF_DT_END_NODE);
}
void ft_nop(struct ft_cxt *cxt)
{
ft_put_word(cxt, OF_DT_NOP);
}
static int lookup_string(struct ft_cxt *cxt, const char *name)
{
u8 *p;
p = cxt->pstr;
while (p < cxt->pstr_begin) {
if (strcmp(p, name) == 0)
return p - cxt->p_begin;
p += strlen(p) + 1;
}
return -1;
}
void ft_prop(struct ft_cxt *cxt, const char *name, const void *data, int sz)
{
int len, off;
if (cxt->overflow)
return;
len = strlen(name) + 1;
off = lookup_string(cxt, name);
if (off == -1) {
/* check if we have space */
if (cxt->p + 12 + sz + len > cxt->pstr) {
cxt->overflow = 1;
return;
}
cxt->pstr -= len;
memcpy(cxt->pstr, name, len);
off = cxt->pstr - cxt->p_begin;
}
/* now put offset from beginning of *STRUCTURE* */
/* will be fixed up at the end */
ft_put_word(cxt, OF_DT_PROP);
ft_put_word(cxt, sz);
ft_put_word(cxt, off);
ft_put_bin(cxt, data, sz);
}
void ft_prop_str(struct ft_cxt *cxt, const char *name, const char *str)
{
ft_prop(cxt, name, str, strlen(str) + 1);
}
void ft_prop_int(struct ft_cxt *cxt, const char *name, int val)
{
u32 v = cpu_to_be32((u32) val);
ft_prop(cxt, name, &v, 4);
}
/* start construction of the flat OF tree */
void ft_begin(struct ft_cxt *cxt, void *blob, int max_size)
{
struct boot_param_header *bph = blob;
u32 off;
/* clear the cxt */
memset(cxt, 0, sizeof(*cxt));
cxt->bph = bph;
cxt->max_size = max_size;
/* zero everything in the header area */
memset(bph, 0, sizeof(*bph));
bph->magic = cpu_to_be32(OF_DT_HEADER);
bph->version = cpu_to_be32(0x10);
bph->last_comp_version = cpu_to_be32(0x10);
/* start pointers */
cxt->pres_begin = (u8 *) _ALIGN((unsigned long)(bph + 1), 8);
cxt->pres = cxt->pres_begin;
off = (unsigned long)cxt->pres_begin - (unsigned long)bph;
bph->off_mem_rsvmap = cpu_to_be32(off);
((u64 *) cxt->pres)[0] = 0; /* phys = 0, size = 0, terminate */
((u64 *) cxt->pres)[1] = 0;
cxt->p_anchor = cxt->pres + 16; /* over the terminator */
}
/* add a reserver physical area to the rsvmap */
void ft_add_rsvmap(struct ft_cxt *cxt, u64 physaddr, u64 size)
{
((u64 *) cxt->pres)[0] = cpu_to_be64(physaddr); /* phys = 0, size = 0, terminate */
((u64 *) cxt->pres)[1] = cpu_to_be64(size);
cxt->pres += 16; /* advance */
((u64 *) cxt->pres)[0] = 0; /* phys = 0, size = 0, terminate */
((u64 *) cxt->pres)[1] = 0;
/* keep track of size */
cxt->res_size = cxt->pres + 16 - cxt->pres_begin;
cxt->p_anchor = cxt->pres + 16; /* over the terminator */
}
void ft_begin_tree(struct ft_cxt *cxt)
{
cxt->p_begin = cxt->p_anchor;
cxt->pstr_begin = (char *)cxt->bph + cxt->max_size; /* point at the end */
cxt->p = cxt->p_begin;
cxt->pstr = cxt->pstr_begin;
}
int ft_end_tree(struct ft_cxt *cxt)
{
struct boot_param_header *bph = cxt->bph;
int off, sz, sz1;
u32 tag, v;
u8 *p;
ft_put_word(cxt, OF_DT_END);
if (cxt->overflow)
return -ENOMEM;
/* size of the areas */
cxt->struct_size = cxt->p - cxt->p_begin;
cxt->strings_size = cxt->pstr_begin - cxt->pstr;
/* the offset we must move */
off = (cxt->pstr_begin - cxt->p_begin) - cxt->strings_size;
/* the new strings start */
cxt->pstr_begin = cxt->p_begin + cxt->struct_size;
/* move the whole string area */
memmove(cxt->pstr_begin, cxt->pstr, cxt->strings_size);
/* now perform the fixup of the strings */
p = cxt->p_begin;
while ((tag = be32_to_cpu(*(u32 *) p)) != OF_DT_END) {
p += 4;
if (tag == OF_DT_BEGIN_NODE) {
p = (u8 *) _ALIGN((unsigned long)p + strlen(p) + 1, 4);
continue;
}
if (tag == OF_DT_END_NODE || tag == OF_DT_NOP)
continue;
if (tag != OF_DT_PROP)
return -EINVAL;
sz = be32_to_cpu(*(u32 *) p);
p += 4;
v = be32_to_cpu(*(u32 *) p);
v -= off;
*(u32 *) p = cpu_to_be32(v); /* move down */
p += 4;
p = (u8 *) _ALIGN((unsigned long)p + sz, 4);
}
/* fix sizes */
p = (char *)cxt->bph;
sz = (cxt->pstr_begin + cxt->strings_size) - p;
sz1 = _ALIGN(sz, 16); /* align at 16 bytes */
if (sz != sz1)
memset(p + sz, 0, sz1 - sz);
bph->totalsize = cpu_to_be32(sz1);
bph->off_dt_struct = cpu_to_be32(cxt->p_begin - p);
bph->off_dt_strings = cpu_to_be32(cxt->pstr_begin - p);
/* the new strings start */
cxt->pstr_begin = cxt->p_begin + cxt->struct_size;
cxt->pstr = cxt->pstr_begin + cxt->strings_size;
return 0;
}
/**********************************************************************/
static inline int isprint(int c)
{
return c >= 0x20 && c <= 0x7e;
}
static int is_printable_string(const void *data, int len)
{
const char *s = data;
const char *ss;
/* zero length is not */
if (len == 0)
return 0;
/* must terminate with zero */
if (s[len - 1] != '\0')
return 0;
ss = s;
while (*s && isprint(*s))
s++;
/* not zero, or not done yet */
if (*s != '\0' || (s + 1 - ss) < len)
return 0;
return 1;
}
static void print_data(const void *data, int len)
{
int i;
const u8 *s;
/* no data, don't print */
if (len == 0)
return;
if (is_printable_string(data, len)) {
printf(" = \"%s\"", (char *)data);
return;
}
switch (len) {
case 1: /* byte */
printf(" = <0x%02x>", (*(u8 *) data) & 0xff);
break;
case 2: /* half-word */
printf(" = <0x%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
break;
case 4: /* word */
printf(" = <0x%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
break;
case 8: /* double-word */
printf(" = <0x%16llx>", be64_to_cpu(*(uint64_t *) data));
break;
default: /* anything else... hexdump */
printf(" = [");
for (i = 0, s = data; i < len; i++)
printf("%02x%s", s[i], i < len - 1 ? " " : "");
printf("]");
break;
}
}
void ft_dump_blob(const void *bphp)
{
const struct boot_param_header *bph = bphp;
const uint64_t *p_rsvmap = (const uint64_t *)
((const char *)bph + be32_to_cpu(bph->off_mem_rsvmap));
const u32 *p_struct = (const u32 *)
((const char *)bph + be32_to_cpu(bph->off_dt_struct));
const u32 *p_strings = (const u32 *)
((const char *)bph + be32_to_cpu(bph->off_dt_strings));
u32 tag;
const u32 *p;
const char *s, *t;
int depth, sz, shift;
int i;
uint64_t addr, size;
if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
/* not valid tree */
return;
}
depth = 0;
shift = 4;
for (i = 0;; i++) {
addr = be64_to_cpu(p_rsvmap[i * 2]);
size = be64_to_cpu(p_rsvmap[i * 2 + 1]);
if (addr == 0 && size == 0)
break;
printf("/memreserve/ 0x%llx 0x%llx;\n", addr, size);
}
p = p_struct;
while ((tag = be32_to_cpu(*p++)) != OF_DT_END) {
/* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */
if (tag == OF_DT_BEGIN_NODE) {
s = (const char *)p;
p = (u32 *) _ALIGN((unsigned long)p + strlen(s) + 1, 4);
printf("%*s%s {\n", depth * shift, "", s);
depth++;
continue;
}
if (tag == OF_DT_END_NODE) {
depth--;
printf("%*s};\n", depth * shift, "");
continue;
}
if (tag == OF_DT_NOP) {
printf("%*s[NOP]\n", depth * shift, "");
continue;
}
if (tag != OF_DT_PROP) {
fprintf(stderr, "%*s ** Unknown tag 0x%08x\n",
depth * shift, "", tag);
break;
}
sz = be32_to_cpu(*p++);
s = (const char *)p_strings + be32_to_cpu(*p++);
t = (const char *)p;
p = (const u32 *)_ALIGN((unsigned long)p + sz, 4);
printf("%*s%s", depth * shift, "", s);
print_data(t, sz);
printf(";\n");
}
}
void ft_backtrack_node(struct ft_cxt *cxt)
{
if (be32_to_cpu(*(u32 *) (cxt->p - 4)) != OF_DT_END_NODE)
return; /* XXX only for node */
cxt->p -= 4;
}
/* note that the root node of the blob is "peeled" off */
void ft_merge_blob(struct ft_cxt *cxt, void *blob)
{
struct boot_param_header *bph = (struct boot_param_header *)blob;
u32 *p_struct = (u32 *) ((char *)bph + be32_to_cpu(bph->off_dt_struct));
u32 *p_strings =
(u32 *) ((char *)bph + be32_to_cpu(bph->off_dt_strings));
u32 tag, *p;
char *s, *t;
int depth, sz;
if (be32_to_cpu(*(u32 *) (cxt->p - 4)) != OF_DT_END_NODE)
return; /* XXX only for node */
cxt->p -= 4;
depth = 0;
p = p_struct;
while ((tag = be32_to_cpu(*p++)) != OF_DT_END) {
/* printf("tag: 0x%08x (%d) - %d\n", tag, p - p_struct, depth); */
if (tag == OF_DT_BEGIN_NODE) {
s = (char *)p;
p = (u32 *) _ALIGN((unsigned long)p + strlen(s) + 1, 4);
if (depth++ > 0)
ft_begin_node(cxt, s);
continue;
}
if (tag == OF_DT_END_NODE) {
ft_end_node(cxt);
if (--depth == 0)
break;
continue;
}
if (tag == OF_DT_NOP)
continue;
if (tag != OF_DT_PROP)
break;
sz = be32_to_cpu(*p++);
s = (char *)p_strings + be32_to_cpu(*p++);
t = (char *)p;
p = (u32 *) _ALIGN((unsigned long)p + sz, 4);
ft_prop(cxt, s, t, sz);
}
}
void *ft_get_prop(void *bphp, const char *propname, int *szp)
{
struct boot_param_header *bph = bphp;
uint32_t *p_struct =
(uint32_t *) ((char *)bph + be32_to_cpu(bph->off_dt_struct));
uint32_t *p_strings =
(uint32_t *) ((char *)bph + be32_to_cpu(bph->off_dt_strings));
uint32_t version = be32_to_cpu(bph->version);
uint32_t tag;
uint32_t *p;
char *s, *t;
char *ss;
int sz;
static char path[256], prop[256];
path[0] = '\0';
p = p_struct;
while ((tag = be32_to_cpu(*p++)) != OF_DT_END) {
if (tag == OF_DT_BEGIN_NODE) {
s = (char *)p;
p = (uint32_t *) _ALIGN((unsigned long)p + strlen(s) +
1, 4);
strcat(path, s);
strcat(path, "/");
continue;
}
if (tag == OF_DT_END_NODE) {
path[strlen(path) - 1] = '\0';
ss = strrchr(path, '/');
if (ss != NULL)
ss[1] = '\0';
continue;
}
if (tag == OF_DT_NOP)
continue;
if (tag != OF_DT_PROP)
break;
sz = be32_to_cpu(*p++);
s = (char *)p_strings + be32_to_cpu(*p++);
if (version < 0x10 && sz >= 8)
p = (uint32_t *) _ALIGN((unsigned long)p, 8);
t = (char *)p;
p = (uint32_t *) _ALIGN((unsigned long)p + sz, 4);
strcpy(prop, path);
strcat(prop, s);
if (strcmp(prop, propname) == 0) {
*szp = sz;
return t;
}
}
return NULL;
}
/********************************************************************/
extern unsigned char oftree_dtb[];
extern unsigned int oftree_dtb_len;
/* Function that returns a character from the environment */
extern uchar(*env_get_char) (int);
#define BDM(x) { .name = #x, .offset = offsetof(bd_t, bi_ ##x ) }
#ifdef CONFIG_OF_HAS_BD_T
static const struct {
const char *name;
int offset;
} bd_map[] = {
BDM(memstart),
BDM(memsize),
BDM(flashstart),
BDM(flashsize),
BDM(flashoffset),
BDM(sramstart),
BDM(sramsize),
#if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_8260) \
|| defined(CONFIG_E500)
BDM(immr_base),
#endif
#if defined(CONFIG_MPC5xxx)
BDM(mbar_base),
#endif
#if defined(CONFIG_MPC83XX)
BDM(immrbar),
#endif
#if defined(CONFIG_MPC8220)
BDM(mbar_base),
BDM(inpfreq),
BDM(pcifreq),
BDM(pevfreq),
BDM(flbfreq),
BDM(vcofreq),
#endif
BDM(bootflags),
BDM(ip_addr),
BDM(intfreq),
BDM(busfreq),
#ifdef CONFIG_CPM2
BDM(cpmfreq),
BDM(brgfreq),
BDM(sccfreq),
BDM(vco),
#endif
#if defined(CONFIG_MPC5xxx)
BDM(ipbfreq),
BDM(pcifreq),
#endif
BDM(baudrate),
};
#endif
void ft_setup(void *blob, int size, bd_t * bd, ulong initrd_start, ulong initrd_end)
{
u32 *p;
int len;
struct ft_cxt cxt;
ulong clock;
#if defined(CONFIG_OF_HAS_UBOOT_ENV)
int k, nxt;
#endif
#if defined(CONFIG_OF_HAS_BD_T)
u8 *end;
#endif
#if defined(CONFIG_OF_HAS_UBOOT_ENV) || defined(CONFIG_OF_HAS_BD_T)
int i;
static char tmpenv[256];
#endif
/* disable OF tree; booting old kernel */
if (getenv("disable_of") != NULL) {
memcpy(blob, bd, sizeof(*bd));
return;
}
ft_begin(&cxt, blob, size);
if (initrd_start && initrd_end)
ft_add_rsvmap(&cxt, initrd_start, initrd_end - initrd_start + 1);
ft_begin_tree(&cxt);
ft_begin_node(&cxt, "");
ft_end_node(&cxt);
/* copy RO tree */
ft_merge_blob(&cxt, oftree_dtb);
/* back into root */
ft_backtrack_node(&cxt);
#ifdef CONFIG_OF_HAS_UBOOT_ENV
ft_begin_node(&cxt, "u-boot-env");
for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
char *s, *lval, *rval;
for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) ;
s = tmpenv;
for (k = i; k < nxt && s < &tmpenv[sizeof(tmpenv) - 1]; ++k)
*s++ = env_get_char(k);
*s++ = '\0';
lval = tmpenv;
s = strchr(tmpenv, '=');
if (s != NULL) {
*s++ = '\0';
rval = s;
} else
continue;
ft_prop_str(&cxt, lval, rval);
}
ft_end_node(&cxt);
#endif
ft_begin_node(&cxt, "chosen");
ft_prop_str(&cxt, "name", "chosen");
ft_prop_str(&cxt, "bootargs", getenv("bootargs"));
ft_prop_int(&cxt, "linux,platform", 0x600); /* what is this? */
if (initrd_start && initrd_end) {
ft_prop_int(&cxt, "linux,initrd-start", initrd_start);
ft_prop_int(&cxt, "linux,initrd-end", initrd_end);
}
#ifdef OF_STDOUT_PATH
ft_prop_str(&cxt, "linux,stdout-path", OF_STDOUT_PATH);
#endif
ft_end_node(&cxt);
ft_end_node(&cxt); /* end root */
ft_end_tree(&cxt);
/*
printf("merged OF-tree\n");
ft_dump_blob(blob);
*/
#ifdef CONFIG_OF_HAS_BD_T
/* paste the bd_t at the end of the flat tree */
end = (char *)blob +
be32_to_cpu(((struct boot_param_header *)blob)->totalsize);
memcpy(end, bd, sizeof(*bd));
#endif
#ifdef CONFIG_PPC
#ifdef CONFIG_OF_HAS_BD_T
for (i = 0; i < sizeof(bd_map)/sizeof(bd_map[0]); i++) {
uint32_t v;
sprintf(tmpenv, "/bd_t/%s", bd_map[i].name);
v = *(uint32_t *)((char *)bd + bd_map[i].offset);
p = ft_get_prop(blob, tmpenv, &len);
if (p != NULL)
*p = cpu_to_be32(v);
}
p = ft_get_prop(blob, "/bd_t/enetaddr", &len);
if (p != NULL)
memcpy(p, bd->bi_enetaddr, 6);
p = ft_get_prop(blob, "/bd_t/ethspeed", &len);
if (p != NULL)
*p = cpu_to_be32((uint32_t) bd->bi_ethspeed);
#endif
clock = bd->bi_intfreq;
p = ft_get_prop(blob, "/cpus/" OF_CPU "/clock-frequency", &len);
if (p != NULL)
*p = cpu_to_be32(clock);
#ifdef OF_TBCLK
clock = OF_TBCLK;
p = ft_get_prop(blob, "/cpus/" OF_CPU "/timebase-frequency", &len);
if (p != NULL)
*p = cpu_to_be32(clock);
#endif
#endif /* __powerpc__ */
#ifdef CONFIG_OF_BOARD_SETUP
ft_board_setup(blob, bd);
#endif
/*
printf("final OF-tree\n");
ft_dump_blob(blob);
*/
}
#endif