diff options
Diffstat (limited to 'stand/powerpc/kboot/kbootfdt.c')
| -rw-r--r-- | stand/powerpc/kboot/kbootfdt.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/stand/powerpc/kboot/kbootfdt.c b/stand/powerpc/kboot/kbootfdt.c new file mode 100644 index 000000000000..5ab3c3da43c9 --- /dev/null +++ b/stand/powerpc/kboot/kbootfdt.c @@ -0,0 +1,184 @@ +/*- + * Copyright (C) 2014 Nathan Whitehorn + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <fdt_platform.h> +#include <libfdt.h> +#include "bootstrap.h" +#include "host_syscall.h" + +static void +add_node_to_fdt(void *buffer, const char *path, int fdt_offset) +{ + int child_offset, fd, pfd, error, dentsize; + char subpath[512]; + void *propbuf; + ssize_t proplen; + + struct host_dent { + unsigned long d_fileno; + unsigned long d_off; + unsigned short d_reclen; + char d_name[]; + /* uint8_t d_type; */ + }; + char dents[2048]; + struct host_dent *dent; + int d_type; + + fd = host_open(path, O_RDONLY, 0); + while (1) { + dentsize = host_getdents(fd, dents, sizeof(dents)); + if (dentsize <= 0) + break; + for (dent = (struct host_dent *)dents; + (char *)dent < dents + dentsize; + dent = (struct host_dent *)((void *)dent + dent->d_reclen)) { + sprintf(subpath, "%s/%s", path, dent->d_name); + if (strcmp(dent->d_name, ".") == 0 || + strcmp(dent->d_name, "..") == 0) + continue; + d_type = *((char *)(dent) + dent->d_reclen - 1); + if (d_type == 4 /* DT_DIR */) { + child_offset = fdt_add_subnode(buffer, fdt_offset, + dent->d_name); + if (child_offset < 0) { + printf("Error %d adding node %s/%s, skipping\n", + child_offset, path, dent->d_name); + continue; + } + + add_node_to_fdt(buffer, subpath, child_offset); + } else { + propbuf = malloc(1024); + proplen = 0; + pfd = host_open(subpath, O_RDONLY, 0); + if (pfd > 0) { + proplen = host_read(pfd, propbuf, 1024); + host_close(pfd); + } + error = fdt_setprop(buffer, fdt_offset, dent->d_name, + propbuf, proplen); + free(propbuf); + if (error) + printf("Error %d adding property %s to " + "node %d\n", error, dent->d_name, + fdt_offset); + } + } + } + + host_close(fd); +} + +/* Fix up wrong values added to the device tree by prom_init() in Linux */ + +static void +fdt_linux_fixups(void *fdtp) +{ + int offset, len; + const void *prop; + + /* + * Remove /memory/available properties, which reflect long-gone OF + * state + */ + + offset = fdt_path_offset(fdtp, "/memory@0"); + if (offset > 0) + fdt_delprop(fdtp, offset, "available"); + + /* + * Add reservations for OPAL and RTAS state if present + */ + + offset = fdt_path_offset(fdtp, "/ibm,opal"); + if (offset > 0) { + uint64_t *base, *size; + base = fdt_getprop(fdtp, offset, "opal-base-address", + &len); + size = fdt_getprop(fdtp, offset, "opal-runtime-size", + &len); + if (base != NULL && size != NULL) + fdt_add_mem_rsv(fdtp, fdt64_to_cpu(*base), + fdt64_to_cpu(*size)); + } + offset = fdt_path_offset(fdtp, "/rtas"); + if (offset > 0) { + uint32_t *base, *size; + base = fdt_getprop(fdtp, offset, "linux,rtas-base", &len); + size = fdt_getprop(fdtp, offset, "rtas-size", &len); + if (base != NULL && size != NULL) + fdt_add_mem_rsv(fdtp, fdt32_to_cpu(*base), + fdt32_to_cpu(*size)); + } + + /* + * Patch up /chosen nodes so that the stored handles mean something, + * where possible. + */ + offset = fdt_path_offset(fdtp, "/chosen"); + if (offset > 0) { + fdt_delprop(fdtp, offset, "cpu"); /* This node not meaningful */ + + offset = fdt_path_offset(fdtp, "/chosen"); + prop = fdt_getprop(fdtp, offset, "linux,stdout-package", &len); + if (prop != NULL) { + fdt_setprop(fdtp, offset, "stdout", prop, len); + offset = fdt_path_offset(fdtp, "/chosen"); + fdt_setprop(fdtp, offset, "stdin", prop, len); + } + } +} + +int +fdt_platform_load_dtb(void) +{ + void *buffer; + size_t buflen = 409600; + + buffer = malloc(buflen); + fdt_create_empty_tree(buffer, buflen); + add_node_to_fdt(buffer, "/proc/device-tree", + fdt_path_offset(buffer, "/")); + fdt_linux_fixups(buffer); + + fdt_pack(buffer); + + fdt_load_dtb_addr(buffer); + free(buffer); + + return (0); +} + +void +fdt_platform_fixups(void) +{ + +} + |