| Olivier Deprez | cb4c562 | 2019-09-19 17:46:46 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2019, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <assert.h> |
| 8 | #include <common/debug.h> |
| 9 | #include <lib/debugfs.h> |
| 10 | |
| 11 | #include "blobs.h" |
| 12 | #include "dev.h" |
| 13 | |
| 14 | /******************************************************************************* |
| 15 | * This array contains the directories available from the root directory. |
| 16 | ******************************************************************************/ |
| 17 | static const dirtab_t dirtab[] = { |
| 18 | {"dev", CHDIR | DEV_ROOT_QDEV, 0, O_READ}, |
| 19 | {"blobs", CHDIR | DEV_ROOT_QBLOBS, 0, O_READ}, |
| 20 | {"fip", CHDIR | DEV_ROOT_QFIP, 0, O_READ} |
| 21 | }; |
| 22 | |
| 23 | static const dirtab_t devfstab[] = { |
| 24 | }; |
| 25 | |
| 26 | /******************************************************************************* |
| 27 | * This function exposes the elements of the root directory. |
| 28 | * It also exposes the content of the dev and blobs directories. |
| 29 | ******************************************************************************/ |
| 30 | static int rootgen(chan_t *channel, const dirtab_t *tab, int ntab, |
| 31 | int n, dir_t *dir) |
| 32 | { |
| 33 | switch (channel->qid & ~CHDIR) { |
| 34 | case DEV_ROOT_QROOT: |
| 35 | tab = dirtab; |
| 36 | ntab = NELEM(dirtab); |
| 37 | break; |
| 38 | case DEV_ROOT_QDEV: |
| 39 | tab = devfstab; |
| 40 | ntab = NELEM(devfstab); |
| 41 | break; |
| 42 | case DEV_ROOT_QBLOBS: |
| 43 | tab = blobtab; |
| 44 | ntab = NELEM(blobtab); |
| 45 | break; |
| 46 | default: |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | return devgen(channel, tab, ntab, n, dir); |
| 51 | } |
| 52 | |
| 53 | static int rootwalk(chan_t *channel, const char *name) |
| 54 | { |
| 55 | return devwalk(channel, name, NULL, 0, rootgen); |
| 56 | } |
| 57 | |
| 58 | /******************************************************************************* |
| 59 | * This function copies at most n bytes from the element referred by c into buf. |
| 60 | ******************************************************************************/ |
| 61 | static int rootread(chan_t *channel, void *buf, int size) |
| 62 | { |
| 63 | const dirtab_t *dp; |
| 64 | dir_t *dir; |
| 65 | |
| 66 | if ((channel->qid & CHDIR) != 0) { |
| 67 | if (size < sizeof(dir_t)) { |
| 68 | return -1; |
| 69 | } |
| 70 | |
| 71 | dir = buf; |
| 72 | return dirread(channel, dir, NULL, 0, rootgen); |
| 73 | } |
| 74 | |
| 75 | /* Only makes sense when using debug language */ |
| 76 | assert(channel->qid != DEV_ROOT_QBLOBCTL); |
| 77 | |
| 78 | dp = &blobtab[channel->qid - DEV_ROOT_QBLOBCTL]; |
| 79 | return buf_to_channel(channel, buf, dp->data, size, dp->length); |
| 80 | } |
| 81 | |
| 82 | static int rootstat(chan_t *channel, const char *file, dir_t *dir) |
| 83 | { |
| 84 | return devstat(channel, file, dir, NULL, 0, rootgen); |
| 85 | } |
| 86 | |
| 87 | const dev_t rootdevtab = { |
| 88 | .id = '/', |
| 89 | .stat = rootstat, |
| 90 | .clone = devclone, |
| 91 | .attach = devattach, |
| 92 | .walk = rootwalk, |
| 93 | .read = rootread, |
| 94 | .write = deverrwrite, |
| 95 | .mount = deverrmount, |
| 96 | .seek = devseek |
| 97 | }; |