diff options
| -rw-r--r-- | drivers/of/fdt.c | 106 |
1 files changed, 100 insertions, 6 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 88f0523260..b2253aa7a2 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -46,6 +46,70 @@ static inline char *dt_string(struct fdt_header *f, char *strstart, uint32_t ofs return strstart + ofs; } +static int of_reservemap_num_entries(const struct fdt_header *fdt) +{ + const struct fdt_reserve_entry *r; + int n = 0; + + r = (void *)fdt + be32_to_cpu(fdt->off_mem_rsvmap); + + while (r->size) { + n++; + r++; + if (n == OF_MAX_RESERVE_MAP) + return -EINVAL; + } + + return n; +} + +/** + * of_unflatten_reservemap - store /memreserve/ entries in unflattened tree + * @root - The unflattened tree + * @fdt - the flattened device tree blob + * + * This stores the memreserve entries from the dtb in a newly created + * /memserve node in the unflattened device tree. The device tree + * flatten code moves the entries back to the /memreserve/ area in the + * flattened tree. + * + * Return: 0 for success or negative error code + */ +static int of_unflatten_reservemap(struct device_node *root, + const struct fdt_header *fdt) +{ + int n; + struct property *p; + struct device_node *memreserve; + __be32 cells; + + n = of_reservemap_num_entries(fdt); + if (n <= 0) + return n; + + memreserve = of_new_node(root, "memreserve"); + if (!memreserve) + return -ENOMEM; + + cells = cpu_to_be32(2); + + p = of_new_property(memreserve, "#address-cells", &cells, sizeof(__be32)); + if (!p) + return -ENOMEM; + + p = of_new_property(memreserve, "#size-cells", &cells, sizeof(__be32)); + if (!p) + return -ENOMEM; + + p = of_new_property(memreserve, "reg", + (void *)fdt + be32_to_cpu(fdt->off_mem_rsvmap), + n * sizeof(struct fdt_reserve_entry)); + if (!p) + return -ENOMEM; + + return 0; +} + /** * of_unflatten_dtb - unflatten a dtb binary blob * @infdt - the fdt blob to unflatten @@ -103,6 +167,10 @@ struct device_node *of_unflatten_dtb(const void *infdt) if (!root) return ERR_PTR(-ENOMEM); + ret = of_unflatten_reservemap(root, fdt); + if (ret) + goto err; + while (1) { tag = be32_to_cpu(*(uint32_t *)(infdt + dt_struct)); @@ -289,7 +357,7 @@ static inline int dt_add_string(struct fdt *fdt, const char *str) return ret; } -static int __of_flatten_dtb(struct fdt *fdt, struct device_node *node) +static int __of_flatten_dtb(struct fdt *fdt, struct device_node *node, int is_root) { struct property *p; struct device_node *n; @@ -322,7 +390,10 @@ static int __of_flatten_dtb(struct fdt *fdt, struct device_node *node) } list_for_each_entry(n, &node->children, parent_list) { - ret = __of_flatten_dtb(fdt, n); + if (is_root && !strcmp(n->name, "memreserve")) + continue; + + ret = __of_flatten_dtb(fdt, n, 0); if (ret) return ret; } @@ -347,8 +418,10 @@ void *of_flatten_dtb(struct device_node *node) int ret; struct fdt_header header = {}; struct fdt fdt = {}; - uint32_t ofs; + uint32_t ofs, off_mem_rsvmap; struct fdt_node_header *nh; + struct device_node *memreserve; + int len; header.magic = cpu_to_fdt32(FDT_MAGIC); header.version = cpu_to_fdt32(0x11); @@ -364,14 +437,24 @@ void *of_flatten_dtb(struct device_node *node) ofs = sizeof(struct fdt_header); - header.off_mem_rsvmap = cpu_to_fdt32(ofs); + off_mem_rsvmap = ofs; + header.off_mem_rsvmap = cpu_to_fdt32(off_mem_rsvmap); ofs += sizeof(struct fdt_reserve_entry) * OF_MAX_RESERVE_MAP; fdt.dt_nextofs = ofs; - ret = __of_flatten_dtb(&fdt, node); + ret = __of_flatten_dtb(&fdt, node, 1); if (ret) goto out_free; + + memreserve = of_find_node_by_name(node, "memreserve"); + if (memreserve) { + const void *entries = of_get_property(memreserve, "reg", &len); + + if (entries) + memcpy(fdt.dt + off_mem_rsvmap, entries, len); + } + nh = fdt.dt + fdt.dt_nextofs; nh->tag = cpu_to_fdt32(FDT_END); fdt.dt_nextofs = dt_next_ofs(fdt.dt_nextofs, sizeof(struct fdt_node_header)); @@ -453,7 +536,18 @@ void fdt_add_reserve_map(void *__fdt) struct of_reserve_map *res = &of_reserve_map; struct fdt_reserve_entry *fdt_res = __fdt + be32_to_cpu(fdt->off_mem_rsvmap); - int i; + int i, n; + + n = of_reservemap_num_entries(fdt); + if (n < 0) + return; + + if (n + res->num_entries + 2 > OF_MAX_FREE_RESERVE_MAP) { + pr_err("Too many entries in reserve map\n"); + return; + } + + fdt_res += n; for (i = 0; i < res->num_entries; i++) { of_write_number(&fdt_res->address, res->start[i], 2); |