diff options
| -rw-r--r-- | include/libfdt.h | 5 | ||||
| -rw-r--r-- | libfdt/fdt_ro.c | 72 | ||||
| -rw-r--r-- | libfdt/fdt_wip.c | 26 |
3 files changed, 103 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h index 61f56ec..f8bac73 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -86,6 +86,8 @@ void *fdt_getprop(const void *fdt, int nodeoffset, uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset, char **namep); +int fdt_num_reservemap(void *fdt, int *used, int *total); +int fdt_get_reservemap(void *fdt, int n, struct fdt_reserve_entry *re); /* Write-in-place functions */ int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, @@ -99,6 +101,8 @@ int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, int fdt_nop_property(void *fdt, int nodeoffset, const char *name); int fdt_nop_node(void *fdt, int nodeoffset); +int fdt_insert_reservemap_entry(void *fdt, int n, uint64_t addr, uint64_t size); + /* Sequential-write functions */ int fdt_create(void *buf, int bufsize); @@ -115,6 +119,7 @@ int fdt_property(void *fdt, const char *name, const void *val, int len); fdt_property(fdt, name, str, strlen(str)+1) int fdt_end_node(void *fdt); int fdt_finish(void *fdt); +int fdt_replace_reservemap_entry(void *fdt, int n, uint64_t addr, uint64_t size); /* Read-write functions */ int fdt_open_into(void *fdt, void *buf, int bufsize); diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c index 2711324..af33336 100644 --- a/libfdt/fdt_ro.c +++ b/libfdt/fdt_ro.c @@ -329,3 +329,75 @@ uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset, char **namep return tag; } + +/* + * Return the number of used reserve map entries and total slots available. + */ +int fdt_num_reservemap(void *fdt, int *used, int *total) +{ + struct fdt_reserve_entry *re; + int start; + int end; + int err = fdt_check_header(fdt); + + if (err != 0) + return err; + + start = fdt_off_mem_rsvmap(fdt); + + /* + * Convention is that the reserve map is before the dt_struct, + * but it does not have to be. + */ + end = fdt_totalsize(fdt); + if (end > fdt_off_dt_struct(fdt)) + end = fdt_off_dt_struct(fdt); + if (end > fdt_off_dt_strings(fdt)) + end = fdt_off_dt_strings(fdt); + + /* + * Since the reserved area list is zero terminated, you get one fewer. + */ + if (total) + *total = ((end - start) / sizeof(struct fdt_reserve_entry)) - 1; + + if (used) { + *used = 0; + while (start < end) { + re = (struct fdt_reserve_entry *)(fdt + start); + if (re->size == 0) + return 0; /* zero size terminates the list */ + + *used += 1; + start += sizeof(struct fdt_reserve_entry); + } + /* + * If we get here, there was no zero size termination. + */ + return -FDT_ERR_BADLAYOUT; + } + return 0; +} + +/* + * Return the nth reserve map entry. + */ +int fdt_get_reservemap(void *fdt, int n, struct fdt_reserve_entry *re) +{ + int used; + int total; + int err; + + err = fdt_num_reservemap(fdt, &used, &total); + if (err != 0) + return err; + + if (n >= total) + return -FDT_ERR_NOSPACE; + if (re) { + *re = *(struct fdt_reserve_entry *) + _fdt_offset_ptr(fdt, n * sizeof(struct fdt_reserve_entry)); + } + return 0; +} + diff --git a/libfdt/fdt_wip.c b/libfdt/fdt_wip.c index 261b9b0..cf81183 100644 --- a/libfdt/fdt_wip.c +++ b/libfdt/fdt_wip.c @@ -110,3 +110,29 @@ int fdt_nop_node(void *fdt, int nodeoffset) nop_region(fdt_offset_ptr(fdt, nodeoffset, 0), endoffset - nodeoffset); return 0; } + +/* + * Replace a reserve map entry in the nth slot. + */ +int fdt_replace_reservemap_entry(void *fdt, int n, uint64_t addr, uint64_t size) +{ + struct fdt_reserve_entry *re; + int used; + int total; + int err; + + err = fdt_num_reservemap(fdt, &used, &total); + if (err != 0) + return err; + + if (n >= total) + return -FDT_ERR_NOSPACE; + re = (struct fdt_reserve_entry *) + (fdt + fdt_off_mem_rsvmap(fdt) + + (n * sizeof(struct fdt_reserve_entry))); + re->address = cpu_to_fdt64(addr); + re->size = cpu_to_fdt64(size); + + return 0; +} + |