diff options
Diffstat (limited to 'sys/dev/ofw')
| -rw-r--r-- | sys/dev/ofw/fdt.c | 115 | ||||
| -rw-r--r-- | sys/dev/ofw/fdt.h | 13 |
2 files changed, 122 insertions, 6 deletions
diff --git a/sys/dev/ofw/fdt.c b/sys/dev/ofw/fdt.c index ddc837fa858..9646d74eeb8 100644 --- a/sys/dev/ofw/fdt.c +++ b/sys/dev/ofw/fdt.c @@ -1,4 +1,4 @@ -/* $OpenBSD: fdt.c,v 1.24 2020/07/06 15:18:03 kettenis Exp $ */ +/* $OpenBSD: fdt.c,v 1.25 2020/07/18 09:44:59 kettenis Exp $ */ /* * Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net> @@ -93,13 +93,30 @@ fdt_init(void *fdt) tree.tree = (char *)fdt + betoh32(tree.header->fh_struct_off); tree.strings = (char *)fdt + betoh32(tree.header->fh_strings_off); tree.memory = (char *)fdt + betoh32(tree.header->fh_reserve_off); + tree.end = (char *)fdt + betoh32(tree.header->fh_size); tree.version = version; tree.strings_size = betoh32(tree.header->fh_strings_size); + if (tree.version >= 17) + tree.struct_size = betoh32(tree.header->fh_struct_size); tree_inited = 1; return version; } +void +fdt_finalize(void) +{ + char *start = (char *)tree.header; + + tree.header->fh_size = htobe32(tree.end - start); + tree.header->fh_struct_off = htobe32(tree.tree - start); + tree.header->fh_strings_off = htobe32(tree.strings - start); + tree.header->fh_reserve_off = htobe32(tree.memory - start); + tree.header->fh_strings_size = htobe32(tree.strings_size); + if (tree.version >= 17) + tree.header->fh_struct_size = htobe32(tree.struct_size); +} + /* * Return the size of the FDT. */ @@ -126,6 +143,25 @@ fdt_get_str(u_int32_t num) return (tree.strings) ? (tree.strings + num) : NULL; } +int +fdt_add_str(char *name) +{ + size_t len = roundup(strlen(name) + 1, sizeof(uint32_t)); + char *end = tree.strings + tree.strings_size; + + memmove(end + len, end, tree.end - end); + tree.strings_size += len; + if (tree.tree > tree.strings) + tree.tree += len; + if (tree.memory > tree.strings) + tree.memory += len; + tree.end += len; + memset(end, 0, len); + memcpy(end, name, strlen(name)); + + return (end - tree.strings); +} + /* * Utility functions for skipping parts of tree. */ @@ -203,6 +239,81 @@ fdt_node_property(void *node, char *name, char **out) return -1; } +int +fdt_node_set_property(void *node, char *name, void *data, int len) +{ + uint32_t *ptr, *next; + uint32_t nameid; + uint32_t curlen; + size_t delta; + char *tmp; + + if (!tree_inited) + return 0; + + ptr = (uint32_t *)node; + + if (betoh32(*ptr) != FDT_NODE_BEGIN) + return 0; + + ptr = skip_node_name(ptr + 1); + + while (betoh32(*ptr) == FDT_PROPERTY) { + nameid = betoh32(*(ptr + 2)); /* id of name in strings table */ + tmp = fdt_get_str(nameid); + next = skip_property(ptr); + if (!strcmp(name, tmp)) { + curlen = betoh32(*(ptr + 1)); + delta = roundup(len, sizeof(uint32_t)) - + roundup(curlen, sizeof(uint32_t)); + memmove((char *)next + delta, next, + tree.end - (char *)next); + tree.struct_size += delta; + if (tree.strings > tree.tree) + tree.strings += delta; + if (tree.memory > tree.tree) + tree.memory += delta; + tree.end += delta; + *(ptr + 1) = htobe32(len); + memcpy(ptr + 3, data, len); + return 1; + } + ptr = next; + } + return 0; +} + +int +fdt_node_add_property(void *node, char *name, void *data, int len) +{ + char *dummy; + + if (!tree_inited) + return 0; + + if (fdt_node_property(node, name, &dummy) == -1) { + uint32_t *ptr = (uint32_t *)node; + + if (betoh32(*ptr) != FDT_NODE_BEGIN) + return 0; + + ptr = skip_node_name(ptr + 1); + + memmove(ptr + 3, ptr, tree.end - (char *)ptr); + tree.struct_size += 3 * sizeof(uint32_t); + if (tree.strings > tree.tree) + tree.strings += 3 * sizeof(uint32_t); + if (tree.memory > tree.tree) + tree.memory += 3 * sizeof(uint32_t); + tree.end += 3 * sizeof(uint32_t); + *ptr++ = htobe32(FDT_PROPERTY); + *ptr++ = htobe32(0); + *ptr++ = htobe32(fdt_add_str(name)); + } + + return fdt_node_set_property(node, name, data, len); +} + /* * Retrieves next node, skipping all the children nodes of the pointed node, * returns pointer to next node, no matter if it exists or not. @@ -240,7 +351,7 @@ fdt_next_node(void *node) ptr = node; if (node == NULL) { - ptr = skip_nops(tree.tree); + ptr = skip_nops((uint32_t *)tree.tree); return (betoh32(*ptr) == FDT_NODE_BEGIN) ? ptr : NULL; } diff --git a/sys/dev/ofw/fdt.h b/sys/dev/ofw/fdt.h index 1e4263cceba..d53fd9e97f4 100644 --- a/sys/dev/ofw/fdt.h +++ b/sys/dev/ofw/fdt.h @@ -1,4 +1,4 @@ -/* $OpenBSD: fdt.h,v 1.5 2016/07/26 22:10:10 patrick Exp $ */ +/* $OpenBSD: fdt.h,v 1.6 2020/07/18 09:44:59 kettenis Exp $ */ /* * Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net> @@ -31,11 +31,13 @@ struct fdt_head { struct fdt { struct fdt_head *header; - void * tree; - void * strings; - void * memory; + char *tree; + char *strings; + char *memory; + char *end; int version; int strings_size; + int struct_size; }; struct fdt_reg { @@ -53,12 +55,15 @@ struct fdt_reg { #define FDT_CODE_VERSION 0x11 int fdt_init(void *); +void fdt_finalize(void); size_t fdt_get_size(void *); void *fdt_next_node(void *); void *fdt_child_node(void *); char *fdt_node_name(void *); void *fdt_find_node(char *); int fdt_node_property(void *, char *, char **); +int fdt_node_set_property(void *, char *, void *, int); +int fdt_node_add_property(void *, char *, void *, int); void *fdt_parent_node(void *); void *fdt_find_phandle(uint32_t); int fdt_get_reg(void *, int, struct fdt_reg *); |