2 * fs_of.c - an implementation for OpenFirmware supported filesystems
4 * Copyright (C) 2001, 2002 Ethan Benson
6 * Copyright (C) 1999 Benjamin Herrenschmidt
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 * BrokenFirmware cannot "read" from the network. We use tftp "load"
25 * method for network boot for now, we may provide our own NFS
26 * implementation in a later version. That means that we allocate a
27 * huge block of memory for the entire file before loading it. We use
28 * the location where the kernel puts RTAS, it's not used by the
29 * bootloader and if freed when the kernel is booted. This will have
30 * to be changed if we plan to instanciate RTAS in the bootloader
41 #include "partition.h"
42 #include "fdisk-part.h"
47 #define LOAD_BUFFER_POS 0x1000000
48 #define LOAD_BUFFER_SIZE 0x1400000
50 static int of_open(struct boot_file_t* file,
51 struct partition_t* part, struct boot_fspec_t* fspec);
52 static int of_read(struct boot_file_t* file, unsigned int size, void* buffer);
53 static int of_seek(struct boot_file_t* file, unsigned int newpos);
54 static int of_close(struct boot_file_t* file);
57 static int of_net_open(struct boot_file_t* file,
58 struct partition_t* part, struct boot_fspec_t* fspec);
59 static int of_net_read(struct boot_file_t* file, unsigned int size, void* buffer);
60 static int of_net_seek(struct boot_file_t* file, unsigned int newpos);
63 struct fs_t of_filesystem =
72 struct fs_t of_net_filesystem =
82 of_open(struct boot_file_t* file,
83 struct partition_t* part, struct boot_fspec_t* fspec)
85 static char buffer[1024];
92 strncpy(buffer, fspec->dev, 768);
95 if (part->sys_ind == LINUX_RAID) {
96 DEBUG_F("skipping because partition is marked LINUX_RAID\n");
97 DEBUG_LEAVE(FILE_ERR_BAD_FSYS);
98 return FILE_ERR_BAD_FSYS;
101 sprintf(pn, "%02d", part->part_number);
104 if (fspec->file && strlen(fspec->file)) {
107 filename = strdup(fspec->file);
108 for (p = filename; *p; p++)
111 strcat(buffer, filename);
115 DEBUG_F("opening: \"%s\"\n", buffer);
117 file->of_device = prom_open(buffer);
119 DEBUG_F("file->of_device = %p\n", file->of_device);
123 if ((file->of_device == PROM_INVALID_HANDLE) || (file->of_device == 0))
125 DEBUG_LEAVE(FILE_ERR_BAD_FSYS);
126 return FILE_ERR_BAD_FSYS;
129 DEBUG_LEAVE(FILE_ERR_OK);
134 of_net_open(struct boot_file_t* file,
135 struct partition_t* part, struct boot_fspec_t* fspec)
137 static char buffer[1024];
138 char *filename = NULL;
144 if (fspec->file && strlen(fspec->file)) {
145 filename = strdup(fspec->file);
146 for (p = filename; *p; p++)
151 DEBUG_F("siaddr <%s>; filename <%s>; ciaddr <%s>; giaddr <%s>;\n",
152 fspec->siaddr, filename, fspec->ciaddr, fspec->giaddr);
153 strncpy(buffer, fspec->dev, 768);
154 strcat(buffer, fspec->siaddr);
156 strcat(buffer, filename);
158 strcat(buffer, fspec->ciaddr);
160 strcat(buffer, fspec->giaddr);
162 strcat(buffer, fspec->bootp_retries);
164 strcat(buffer, fspec->tftp_retries);
166 strcat(buffer, fspec->addl_params);
168 DEBUG_F("Opening: \"%s\"\n", buffer);
170 file->of_device = prom_open(buffer);
172 DEBUG_F("file->of_device = %p\n", file->of_device);
175 if ((file->of_device == PROM_INVALID_HANDLE) || (file->of_device == 0))
177 DEBUG_LEAVE(FILE_ERR_BAD_FSYS);
178 return FILE_ERR_BAD_FSYS;
182 file->buffer = prom_claim_chunk((void *)LOAD_BUFFER_POS,
183 LOAD_BUFFER_SIZE, 0);
184 if (file->buffer == (void *)-1) {
185 prom_printf("Can't claim memory for TFTP download\n");
186 prom_close(file->of_device);
187 DEBUG_LEAVE(FILE_IOERR);
190 memset(file->buffer, 0, LOAD_BUFFER_SIZE);
194 file->len = prom_loadmethod(file->of_device, file->buffer);
196 DEBUG_F("result: %Ld\n", file->len);
198 DEBUG_LEAVE(FILE_ERR_OK);
203 of_read(struct boot_file_t* file, unsigned int size, void* buffer)
207 count = prom_read(file->of_device, buffer, size);
213 of_net_read(struct boot_file_t* file, unsigned int size, void* buffer)
215 unsigned int count, av;
217 av = file->len - file->pos;
218 count = size > av ? av : size;
219 memcpy(buffer, file->buffer + file->pos, count);
225 of_seek(struct boot_file_t* file, unsigned int newpos)
227 if (prom_seek(file->of_device, newpos)) {
232 return FILE_CANT_SEEK;
236 of_net_seek(struct boot_file_t* file, unsigned int newpos)
238 file->pos = (newpos > file->len) ? file->len : newpos;
243 of_close(struct boot_file_t* file)
247 DEBUG_F("<@%p>\n", file->of_device);
250 prom_release(file->buffer, LOAD_BUFFER_SIZE);
252 prom_close(file->of_device);
253 DEBUG_F("of_close called\n");
261 * c-file-style: "k&r"