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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Michal Konopa |
2 | * Copyright (c) 2007 Michal Konopa |
3 | * Copyright (c) 2007 Martin Jelen |
3 | * Copyright (c) 2007 Martin Jelen |
4 | * Copyright (c) 2007 Peter Majer |
4 | * Copyright (c) 2007 Peter Majer |
- | 5 | * Copyright (c) 2007 Jakub Jermar |
|
5 | * All rights reserved. |
6 | * All rights reserved. |
6 | * |
7 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * are met: |
Line 47... | Line 48... | ||
47 | #include <bool.h> |
48 | #include <bool.h> |
48 | #include <errno.h> |
49 | #include <errno.h> |
49 | #include <async.h> |
50 | #include <async.h> |
50 | #include <align.h> |
51 | #include <align.h> |
51 | #include <async.h> |
52 | #include <async.h> |
- | 53 | #include <futex.h> |
|
52 | #include "rd.h" |
54 | #include "rd.h" |
53 | 55 | ||
- | 56 | /** Pointer to the ramdisk's image. */ |
|
54 | static void *rd_addr; |
57 | static void *rd_addr; |
55 | static void *fs_addr; |
- | |
56 | 58 | ||
- | 59 | /** |
|
- | 60 | * This futex protects the ramdisk's data. |
|
- | 61 | * If we were to serve multiple requests (read + write or several writes) |
|
- | 62 | * concurrently (i.e. from two or more threads), each read and write needs to be |
|
- | 63 | * protected by this futex. |
|
- | 64 | */ |
|
- | 65 | atomic_t rd_futex = FUTEX_INITIALIZER; |
|
- | 66 | ||
- | 67 | /** Handle one connection to ramdisk. |
|
- | 68 | * |
|
- | 69 | * @param iid Hash of the request that opened the connection. |
|
- | 70 | * @param icall Call data of the request that opened the connection. |
|
- | 71 | */ |
|
57 | static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
72 | static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
58 | { |
73 | { |
59 | ipc_callid_t callid; |
74 | ipc_callid_t callid; |
60 | ipc_call_t call; |
75 | ipc_call_t call; |
61 | int retval; |
76 | int retval; |
62 | - | ||
63 | ipc_answer_fast(iid, 0, 0, 0); |
77 | uintptr_t fs_va = NULL; |
64 | ipcarg_t offset; |
78 | ipcarg_t offset; |
65 | 79 | ||
- | 80 | /* |
|
- | 81 | * We allocate VA for communication per connection. |
|
- | 82 | * This allows us to potentionally have more clients and work |
|
- | 83 | * concurrently. |
|
- | 84 | */ |
|
- | 85 | fs_va = as_get_mappable_page(ALIGN_UP(BLOCK_SIZE, PAGE_SIZE)); |
|
- | 86 | if (!fs_va) { |
|
- | 87 | /* |
|
- | 88 | * Hang up the phone if we cannot proceed any further. |
|
- | 89 | * This is the answer to the call that opened the connection. |
|
- | 90 | */ |
|
- | 91 | ipc_answer_fast(iid, EHANGUP, 0, 0); |
|
- | 92 | return; |
|
- | 93 | } else { |
|
- | 94 | /* |
|
- | 95 | * Answer the first IPC_M_CONNECT_ME_TO call. |
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- | 96 | * Return supported block size as ARG1. |
|
- | 97 | */ |
|
- | 98 | ipc_answer_fast(iid, EOK, BLOCK_SIZE, 0); |
|
- | 99 | } |
|
- | 100 | ||
- | 101 | /* |
|
- | 102 | * Now we wait for the client to send us its communication as_area. |
|
- | 103 | */ |
|
- | 104 | callid = async_get_call(&call); |
|
- | 105 | if (IPC_GET_METHOD(call) == IPC_M_AS_AREA_SEND) { |
|
- | 106 | if (IPC_GET_ARG1(call) >= (ipcarg_t) BLOCK_SIZE) { |
|
- | 107 | /* |
|
- | 108 | * The client sends an as_area that can absorb the whole |
|
- | 109 | * block. |
|
- | 110 | */ |
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- | 111 | ipc_answer_fast(callid, EOK, (uintptr_t) fs_va, 0); |
|
- | 112 | } else { |
|
- | 113 | /* |
|
- | 114 | * The client offered as_area too small. |
|
- | 115 | * Close the connection. |
|
- | 116 | */ |
|
- | 117 | ipc_answer_fast(callid, EHANGUP, 0, 0); |
|
- | 118 | return; |
|
- | 119 | } |
|
- | 120 | } else { |
|
- | 121 | /* |
|
- | 122 | * The client doesn't speak the same protocol. |
|
- | 123 | * At this point we can't handle protocol variations. |
|
- | 124 | * Close the connection. |
|
- | 125 | */ |
|
- | 126 | ipc_answer_fast(callid, EHANGUP, 0, 0); |
|
- | 127 | return; |
|
- | 128 | } |
|
- | 129 | ||
66 | while (1) { |
130 | while (1) { |
67 | callid = async_get_call(&call); |
131 | callid = async_get_call(&call); |
68 | switch (IPC_GET_METHOD(call)) { |
132 | switch (IPC_GET_METHOD(call)) { |
69 | case IPC_M_PHONE_HUNGUP: |
133 | case IPC_M_PHONE_HUNGUP: |
- | 134 | /* |
|
- | 135 | * The other side has hung up. |
|
- | 136 | * Answer the message and exit the pseudo thread. |
|
- | 137 | */ |
|
70 | ipc_answer_fast(callid, 0, 0, 0); |
138 | ipc_answer_fast(callid, EOK, 0, 0); |
71 | return; |
139 | return; |
72 | case IPC_M_AS_AREA_SEND: |
140 | case RD_READ_BLOCK: |
- | 141 | offset = IPC_GET_ARG1(call); |
|
- | 142 | futex_down(&rd_futex); |
|
73 | ipc_answer_fast(callid, 0, (uintptr_t) fs_addr, 0); |
143 | memcpy((void *) fs_va, rd_addr + offset, BLOCK_SIZE); |
- | 144 | futex_up(&rd_futex); |
|
- | 145 | retval = EOK; |
|
74 | continue; |
146 | break; |
75 | case RD_READ_BLOCK: |
147 | case RD_WRITE_BLOCK: |
76 | offset = IPC_GET_ARG1(call); |
148 | offset = IPC_GET_ARG1(call); |
- | 149 | futex_up(&rd_futex); |
|
77 | memcpy((void *) fs_addr, rd_addr + offset, BLOCK_SIZE); |
150 | memcpy(rd_addr + offset, (void *) fs_va, BLOCK_SIZE); |
- | 151 | futex_down(&rd_futex); |
|
78 | retval = EOK; |
152 | retval = EOK; |
79 | break; |
153 | break; |
80 | default: |
154 | default: |
- | 155 | /* |
|
- | 156 | * The client doesn't speak the same protocol. |
|
- | 157 | * Instead of closing the connection, we just ignore |
|
- | 158 | * the call. This can be useful if the client uses a |
|
- | 159 | * newer version of the protocol. |
|
- | 160 | */ |
|
81 | retval = EINVAL; |
161 | retval = EINVAL; |
- | 162 | break; |
|
82 | } |
163 | } |
83 | ipc_answer_fast(callid, retval, 0, 0); |
164 | ipc_answer_fast(callid, retval, 0, 0); |
84 | } |
165 | } |
85 | } |
166 | } |
86 | 167 | ||
87 | - | ||
- | 168 | /** Prepare the ramdisk image for operation. */ |
|
88 | static bool rd_init(void) |
169 | static bool rd_init(void) |
89 | { |
170 | { |
90 | int retval, flags; |
171 | int retval, flags; |
91 | 172 | ||
92 | size_t rd_size = sysinfo_value("rd.size"); |
173 | size_t rd_size = sysinfo_value("rd.size"); |
Line 101... | Line 182... | ||
101 | retval = physmem_map(rd_ph_addr, rd_addr, |
182 | retval = physmem_map(rd_ph_addr, rd_addr, |
102 | ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
183 | ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
103 | 184 | ||
104 | if (retval < 0) |
185 | if (retval < 0) |
105 | return false; |
186 | return false; |
106 | - | ||
107 | size_t fs_size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE); |
- | |
108 | fs_addr = as_get_mappable_page(fs_size); |
- | |
109 | - | ||
110 | return true; |
187 | return true; |
111 | } |
188 | } |
112 | 189 | ||
113 | int main(int argc, char **argv) |
190 | int main(int argc, char **argv) |
114 | { |
191 | { |