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/*
* OF flat tree builder
* Written by: Pantelis Antoniou <pantelis.antoniou@gmail.com>
* Updated by: Matthew McClintock <msm@freescale.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#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>
#include <linux/ctype.h>
#undef DEBUG
/* align addr on a size boundary - adjust address up if needed -- Cort */
#define _ALIGN(addr,size) (((addr)+(size)-1)&(~((size)-1)))
#ifndef CONFIG_OF_BOOT_CPU
#define CONFIG_OF_BOOT_CPU 0
#endif
#define SIZE_OF_RSVMAP_ENTRY (2*sizeof(u64))
static void ft_put_word(struct ft_cxt *cxt, u32 v)
{
memmove(cxt->p + sizeof(u32), cxt->p, cxt->p_end - cxt->p);
*(u32 *) cxt->p = cpu_to_be32(v);
cxt->p += sizeof(u32);
cxt->p_end += sizeof(u32);
}
static inline void ft_put_bin(struct ft_cxt *cxt, const void *data, int sz)
{
int aligned_size = ((u8 *)_ALIGN((unsigned long)cxt->p + sz,
sizeof(u32))) - cxt->p;
memmove(cxt->p + aligned_size, cxt->p, cxt->p_end - cxt->p);
/* make sure the last bytes are zeroed */
memset(cxt->p + aligned_size - (aligned_size % sizeof(u32)), 0,
(aligned_size % sizeof(u32)));
memcpy(cxt->p, data, sz);
cxt->p += aligned_size;
cxt->p_end += aligned_size;
}
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->p;
while (p < cxt->p_end) {
if (strcmp((char *)p, name) == 0)
return p - cxt->p;
p += strlen((char *)p) + 1;
}
return -1;
}
void ft_prop(struct ft_cxt *cxt, const char *name, const void *data, int sz)
{
int off = 0;
off = lookup_string(cxt, name);
if (off == -1) {
memcpy(cxt->p_end, name, strlen(name) + 1);
off = cxt->p_end - cxt->p;
cxt->p_end += strlen(name) + 1;
}
/* 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, sizeof(u32));
}
/* pick up and start working on a tree in place */
void ft_init_cxt(struct ft_cxt *cxt, void *blob)
{
struct boot_param_header *bph = blob;
memset(cxt, 0, sizeof(*cxt));
cxt->bph = bph;
bph->boot_cpuid_phys = CONFIG_OF_BOOT_CPU;
/* find beginning and end of reserve map table (zeros in last entry) */
cxt->p_rsvmap = (u8 *)bph + bph->off_mem_rsvmap;
while ( ((uint64_t *)cxt->p_rsvmap)[0] != 0 &&
((uint64_t *)cxt->p_rsvmap)[1] != 0 ) {
cxt->p_rsvmap += SIZE_OF_RSVMAP_ENTRY;
}
cxt->p_start = (u8 *)bph + bph->off_dt_struct;
cxt->p_end = (u8 *)bph + bph->totalsize;
cxt->p = (u8 *)bph + bph->off_dt_strings;
}
/* add a reserver physical area to the rsvmap */
void ft_add_rsvmap(struct ft_cxt *cxt, u64 physstart, u64 physend)
{
memmove(cxt->p_rsvmap + SIZE_OF_RSVMAP_ENTRY, cxt->p_rsvmap,
cxt->p_end - cxt->p_rsvmap);
((u64 *)cxt->p_rsvmap)[0] = cpu_to_be64(physstart);
((u64 *)cxt->p_rsvmap)[1] = cpu_to_be64(physend);
((u64 *)cxt->p_rsvmap)[2] = 0;
((u64 *)cxt->p_rsvmap)[3] = 0;
cxt->p_rsvmap += SIZE_OF_RSVMAP_ENTRY;
cxt->p_start += SIZE_OF_RSVMAP_ENTRY;
cxt->p += SIZE_OF_RSVMAP_ENTRY;
cxt->p_end += SIZE_OF_RSVMAP_ENTRY;
}
void ft_end_tree(struct ft_cxt *cxt)
{
ft_put_word(cxt, OF_DT_END);
}
/* update the boot param header with correct values */
void ft_finalize_tree(struct ft_cxt *cxt) {
struct boot_param_header *bph = cxt->bph;
bph->totalsize = cxt->p_end - (u8 *)bph;
bph->off_dt_struct = cxt->p_start - (u8 *)bph;
bph->off_dt_strings = cxt->p - (u8 *)bph;
bph->dt_strings_size = cxt->p_end - cxt->p;
}
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)) {
puts(" = \"");
puts(data);
puts("\"");
return;
}
switch (len) {
case 1: /* byte */
printf(" = <%02x>", (*(u8 *) data) & 0xff);
break;
case 2: /* half-word */
printf(" = <%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
break;
case 4: /* word */
printf(" = <%x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
break;
case 8: /* double-word */
printf(" = <%qx>", 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/ %qx %qx;\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 at 0x%x\n",
depth * shift, "", tag, --p);
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)
{
int i = 4;
while (be32_to_cpu(*(u32 *) (cxt->p - i)) != OF_DT_END_NODE)
i += 4;
memmove (cxt->p - i, cxt->p, cxt->p_end - cxt->p);
cxt->p_end -= i;
cxt->p -= i;
}
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;
}
/********************************************************************/
void ft_setup(void *blob, bd_t * bd, ulong initrd_start, ulong initrd_end)
{
u32 *p;
int len;
struct ft_cxt cxt;
ulong clock;
/* disable OF tree; booting old kernel */
if (getenv("disable_of") != NULL) {
memcpy(blob, bd, sizeof(*bd));
return;
}
#ifdef DEBUG
printf ("recieved oftree\n");
ft_dump_blob(blob);
#endif
ft_init_cxt(&cxt, blob);
if (initrd_start && initrd_end)
ft_add_rsvmap(&cxt, initrd_start, initrd_end - initrd_start + 1);
/* back into root */
ft_backtrack_node(&cxt);
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);
ft_finalize_tree(&cxt);
#ifdef CONFIG_PPC
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
/* in case the size changed in the platform code */
ft_finalize_tree(&cxt);
#ifdef DEBUG
printf("final OF-tree\n");
ft_dump_blob(blob);
#endif
}
#endif