/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 *
 * 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 "dtc.h"

/*
 * Tree building functions
 */

void add_label(struct label **labels, char *label)
{
        struct label *new;

        /* Make sure the label isn't already there */
        for_each_label(*labels, new)
                if (streq(new->label, label))
                        return;

        new = xmalloc(sizeof(*new));
        new->label = label;
        new->next = *labels;
        *labels = new;
}

struct property *build_property(char *name, struct data val)
{
        struct property *new = xmalloc(sizeof(*new));

        memset(new, 0, sizeof(*new));

        new->name = name;
        new->val = val;

        return new;
}

struct property *chain_property(struct property *first, struct property *list)
{
        assert(first->next == NULL);

        first->next = list;
        return first;
}

struct property *reverse_properties(struct property *first)
{
        struct property *p = first;
        struct property *head = NULL;
        struct property *next;

        while (p) {
                next = p->next;
                p->next = head;
                head = p;
                p = next;
        }
        return head;
}

struct node *build_node(struct property *proplist, struct node *children)
{
        struct node *new = xmalloc(sizeof(*new));
        struct node *child;

        memset(new, 0, sizeof(*new));

        new->proplist = reverse_properties(proplist);
        new->children = children;

        for_each_child(new, child) {
                child->parent = new;
        }

        return new;
}

struct node *name_node(struct node *node, char *name)
{
        assert(node->name == NULL);

        node->name = name;

        return node;
}

struct node *merge_nodes(struct node *old_node, struct node *new_node)
{
        struct property *new_prop, *old_prop;
        struct node *new_child, *old_child;
        struct label *l;

        /* Add new node labels to old node */
        for_each_label(new_node->labels, l)
                add_label(&old_node->labels, l->label);

        /* Move properties from the new node to the old node.  If there
         * is a collision, replace the old value with the new */
        while (new_node->proplist) {
                /* Pop the property off the list */
                new_prop = new_node->proplist;
                new_node->proplist = new_prop->next;
                new_prop->next = NULL;

                /* Look for a collision, set new value if there is */
                for_each_property(old_node, old_prop) {
                        if (streq(old_prop->name, new_prop->name)) {
                                /* Add new labels to old property */
                                for_each_label(new_prop->labels, l)
                                        add_label(&old_prop->labels, l->label);

                                old_prop->val = new_prop->val;
                                free(new_prop);
                                new_prop = NULL;
                                break;
                        }
                }

                /* if no collision occurred, add property to the old node. */
                if (new_prop)
                        add_property(old_node, new_prop);
        }

        /* Move the override child nodes into the primary node.  If
         * there is a collision, then merge the nodes. */
        while (new_node->children) {
                /* Pop the child node off the list */
                new_child = new_node->children;
                new_node->children = new_child->next_sibling;
                new_child->parent = NULL;
                new_child->next_sibling = NULL;

                /* Search for a collision.  Merge if there is */
                for_each_child(old_node, old_child) {
                        if (streq(old_child->name, new_child->name)) {
                                merge_nodes(old_child, new_child);
                                new_child = NULL;
                                break;
                        }
                }

                /* if no collision occured, add child to the old node. */
                if (new_child)
                        add_child(old_node, new_child);
        }

        /* The new node contents are now merged into the old node.  Free
         * the new node. */
        free(new_node);

        return old_node;
}

struct node *chain_node(struct node *first, struct node *list)
{
        assert(first->next_sibling == NULL);

        first->next_sibling = list;
        return first;
}

void add_property(struct node *node, struct property *prop)
{
        struct property **p;

        prop->next = NULL;

        p = &node->proplist;
        while (*p)
                p = &((*p)->next);

        *p = prop;
}

void add_child(struct node *parent, struct node *child)
{
        struct node **p;

        child->next_sibling = NULL;
        child->parent = parent;

        p = &parent->children;
        while (*p)
                p = &((*p)->next_sibling);

        *p = child;
}

struct reserve_info *build_reserve_entry(uint64_t address, uint64_t size)
{
        struct reserve_info *new = xmalloc(sizeof(*new));

        memset(new, 0, sizeof(*new));

        new->re.address = address;
        new->re.size = size;

        return new;
}

struct reserve_info *chain_reserve_entry(struct reserve_info *first,
                                        struct reserve_info *list)
{
        assert(first->next == NULL);

        first->next = list;
        return first;
}

struct reserve_info *add_reserve_entry(struct reserve_info *list,
                                      struct reserve_info *new)
{
        struct reserve_info *last;

        new->next = NULL;

        if (! list)
                return new;

        for (last = list; last->next; last = last->next)
                ;

        last->next = new;

        return list;
}

struct boot_info *build_boot_info(struct reserve_info *reservelist,
                                  struct node *tree, uint32_t boot_cpuid_phys)
{
        struct boot_info *bi;

        bi = xmalloc(sizeof(*bi));
        bi->reservelist = reservelist;
        bi->dt = tree;
        bi->boot_cpuid_phys = boot_cpuid_phys;

        return bi;
}

/*
 * Tree accessor functions
 */

const char *get_unitname(struct node *node)
{
        if (node->name[node->basenamelen] == '\0')
                return "";
        else
                return node->name + node->basenamelen + 1;
}

struct property *get_property(struct node *node, const char *propname)
{
        struct property *prop;

        for_each_property(node, prop)
                if (streq(prop->name, propname))
                        return prop;

        return NULL;
}

cell_t propval_cell(struct property *prop)
{
        assert(prop->val.len == sizeof(cell_t));
        return fdt32_to_cpu(*((cell_t *)prop->val.val));
}

struct property *get_property_by_label(struct node *tree, const char *label,
                                       struct node **node)
{
        struct property *prop;
        struct node *c;

        *node = tree;

        for_each_property(tree, prop) {
                struct label *l;

                for_each_label(prop->labels, l)
                        if (streq(l->label, label))
                                return prop;
        }

        for_each_child(tree, c) {
                prop = get_property_by_label(c, label, node);
                if (prop)
                        return prop;
        }

        *node = NULL;
        return NULL;
}

struct marker *get_marker_label(struct node *tree, const char *label,
                                struct node **node, struct property **prop)
{
        struct marker *m;
        struct property *p;
        struct node *c;

        *node = tree;

        for_each_property(tree, p) {
                *prop = p;
                m = p->val.markers;
                for_each_marker_of_type(m, LABEL)
                        if (streq(m->ref, label))
                                return m;
        }

        for_each_child(tree, c) {
                m = get_marker_label(c, label, node, prop);
                if (m)
                        return m;
        }

        *prop = NULL;
        *node = NULL;
        return NULL;
}

struct node *get_subnode(struct node *node, const char *nodename)
{
        struct node *child;

        for_each_child(node, child)
                if (streq(child->name, nodename))
                        return child;

        return NULL;
}

struct node *get_node_by_path(struct node *tree, const char *path)
{
        const char *p;
        struct node *child;

        if (!path || ! (*path))
                return tree;

        while (path[0] == '/')
                path++;

        p = strchr(path, '/');

        for_each_child(tree, child) {
                if (p && strneq(path, child->name, p-path))
                        return get_node_by_path(child, p+1);
                else if (!p && streq(path, child->name))
                        return child;
        }

        return NULL;
}

struct node *get_node_by_label(struct node *tree, const char *label)
{
        struct node *child, *node;
        struct label *l;

        assert(label && (strlen(label) > 0));

        for_each_label(tree->labels, l)
                if (streq(l->label, label))
                        return tree;

        for_each_child(tree, child) {
                node = get_node_by_label(child, label);
                if (node)
                        return node;
        }

        return NULL;
}

struct node *get_node_by_phandle(struct node *tree, cell_t phandle)
{
        struct node *child, *node;

        assert((phandle != 0) && (phandle != -1));

        if (tree->phandle == phandle)
                return tree;

        for_each_child(tree, child) {
                node = get_node_by_phandle(child, phandle);
                if (node)
                        return node;
        }

        return NULL;
}

struct node *get_node_by_ref(struct node *tree, const char *ref)
{
        if (ref[0] == '/')
                return get_node_by_path(tree, ref);
        else
                return get_node_by_label(tree, ref);
}

cell_t get_node_phandle(struct node *root, struct node *node)
{
        static cell_t phandle = 1; /* FIXME: ick, static local */

        if ((node->phandle != 0) && (node->phandle != -1))
                return node->phandle;

        while (get_node_by_phandle(root, phandle))
                phandle++;

        node->phandle = phandle;

        if (!get_property(node, "linux,phandle")
            && (phandle_format & PHANDLE_LEGACY))
                add_property(node,
                             build_property("linux,phandle",
                                            data_append_cell(empty_data, phandle)));

        if (!get_property(node, "phandle")
            && (phandle_format & PHANDLE_EPAPR))
                add_property(node,
                             build_property("phandle",
                                            data_append_cell(empty_data, phandle)));

        /* If the node *does* have a phandle property, we must
         * be dealing with a self-referencing phandle, which will be
         * fixed up momentarily in the caller */

        return node->phandle;
}

uint32_t guess_boot_cpuid(struct node *tree)
{
        struct node *cpus, *bootcpu;
        struct property *reg;

        cpus = get_node_by_path(tree, "/cpus");
        if (!cpus)
                return 0;


        bootcpu = cpus->children;
        if (!bootcpu)
                return 0;

        reg = get_property(bootcpu, "reg");
        if (!reg || (reg->val.len != sizeof(uint32_t)))
                return 0;

        /* FIXME: Sanity check node? */

        return propval_cell(reg);
}

static int cmp_reserve_info(const void *ax, const void *bx)
{
        const struct reserve_info *a, *b;

        a = *((const struct reserve_info * const *)ax);
        b = *((const struct reserve_info * const *)bx);

        if (a->re.address < b->re.address)
                return -1;
        else if (a->re.address > b->re.address)
                return 1;
        else if (a->re.size < b->re.size)
                return -1;
        else if (a->re.size > b->re.size)
                return 1;
        else
                return 0;
}

static void sort_reserve_entries(struct boot_info *bi)
{
        struct reserve_info *ri, **tbl;
        int n = 0, i = 0;

        for (ri = bi->reservelist;
             ri;
             ri = ri->next)
                n++;

        if (n == 0)
                return;

        tbl = xmalloc(n * sizeof(*tbl));

        for (ri = bi->reservelist;
             ri;
             ri = ri->next)
                tbl[i++] = ri;

        qsort(tbl, n, sizeof(*tbl), cmp_reserve_info);

        bi->reservelist = tbl[0];
        for (i = 0; i < (n-1); i++)
                tbl[i]->next = tbl[i+1];
        tbl[n-1]->next = NULL;

        free(tbl);
}

static int cmp_prop(const void *ax, const void *bx)
{
        const struct property *a, *b;

        a = *((const struct property * const *)ax);
        b = *((const struct property * const *)bx);

        return strcmp(a->name, b->name);
}

static void sort_properties(struct node *node)
{
        int n = 0, i = 0;
        struct property *prop, **tbl;

        for_each_property(node, prop)
                n++;

        if (n == 0)
                return;

        tbl = xmalloc(n * sizeof(*tbl));

        for_each_property(node, prop)
                tbl[i++] = prop;

        qsort(tbl, n, sizeof(*tbl), cmp_prop);

        node->proplist = tbl[0];
        for (i = 0; i < (n-1); i++)
                tbl[i]->next = tbl[i+1];
        tbl[n-1]->next = NULL;

        free(tbl);
}

static int cmp_subnode(const void *ax, const void *bx)
{
        const struct node *a, *b;

        a = *((const struct node * const *)ax);
        b = *((const struct node * const *)bx);

        return strcmp(a->name, b->name);
}

static void sort_subnodes(struct node *node)
{
        int n = 0, i = 0;
        struct node *subnode, **tbl;

        for_each_child(node, subnode)
                n++;

        if (n == 0)
                return;

        tbl = xmalloc(n * sizeof(*tbl));

        for_each_child(node, subnode)
                tbl[i++] = subnode;

        qsort(tbl, n, sizeof(*tbl), cmp_subnode);

        node->children = tbl[0];
        for (i = 0; i < (n-1); i++)
                tbl[i]->next_sibling = tbl[i+1];
        tbl[n-1]->next_sibling = NULL;

        free(tbl);
}

static void sort_node(struct node *node)
{
        struct node *c;

        sort_properties(node);
        sort_subnodes(node);
        for_each_child(node, c)
                sort_node(c);
}

void sort_tree(struct boot_info *bi)
{
        sort_reserve_entries(bi);
        sort_node(bi->dt);
}