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comparison packages/hal/powerpc/adder/current/src/redboot_linux_exec.c @ 432:cc4df9225149

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Add Adder platform from Analogue & Micro
author gthomas
date Mon, 25 Nov 2002 23:18:41 +0000
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431:010c4eef5042 432:cc4df9225149
1 //==========================================================================
2 //
3 // redboot_linux_boot.c
4 //
5 // RedBoot command to boot Linux
6 //
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12 // Copyright (C) 2002 Gary Thomas
13 //
14 // eCos is free software; you can redistribute it and/or modify it under
15 // the terms of the GNU General Public License as published by the Free
16 // Software Foundation; either version 2 or (at your option) any later version.
17 //
18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 // for more details.
22 //
23 // You should have received a copy of the GNU General Public License along
24 // with eCos; if not, write to the Free Software Foundation, Inc.,
25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 //
27 // As a special exception, if other files instantiate templates or use macros
28 // or inline functions from this file, or you compile this file and link it
29 // with other works to produce a work based on this file, this file does not
30 // by itself cause the resulting work to be covered by the GNU General Public
31 // License. However the source code for this file must still be made available
32 // in accordance with section (3) of the GNU General Public License.
33 //
34 // This exception does not invalidate any other reasons why a work based on
35 // this file might be covered by the GNU General Public License.
36 //
37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
38 // at http://sources.redhat.com/ecos/ecos-license/
39 // -------------------------------------------
40 //####ECOSGPLCOPYRIGHTEND####
41 //####OTHERCOPYRIGHTBEGIN####
42 //
43 // The structure definitions below are taken from include/ppc/platforms/am860.h in
44 // the Linux kernel, Copyright (c) 2002 Gary Thomas, Copyright (c) 1997 Dan Malek.
45 // Their presence here is for the express purpose of communication with the Linux
46 // kernel being booted and is considered 'fair use' by the original author and
47 // are included with their permission.
48 //
49 //####OTHERCOPYRIGHTEND####
50 //==========================================================================
51 //#####DESCRIPTIONBEGIN####
52 //
53 // Author(s): msalter
54 // Contributors: gthomas,msalter
55 // Date: 2002-01-14
56 // Purpose:
57 // Description:
58 //
59 // This code is part of RedBoot (tm).
60 //
61 //####DESCRIPTIONEND####
62 //
63 //==========================================================================
64
65 #include <redboot.h>
66 #include <pkgconf/hal_powerpc_quicc.h>
67
68 #include <cyg/hal/hal_arch.h>
69 #include <cyg/hal/hal_if.h>
70 #include <cyg/hal/hal_intr.h>
71 #include <cyg/hal/hal_cache.h>
72
73 #ifdef CYGPKG_REDBOOT_NETWORKING
74 #include <net/net.h>
75 #endif
76
77 #ifdef CYGSEM_REDBOOT_HAL_LINUX_BOOT
78
79 #include CYGHWR_MEMORY_LAYOUT_H
80
81 //=========================================================================
82
83 // Exported CLI function(s)
84 static void do_exec(int argc, char *argv[]);
85 RedBoot_cmd("exec",
86 "Execute a Linux image - with MMU off",
87 "[-w timeout]\n"
88 " [-c \"kernel command line\"] [<entry_point>]",
89 do_exec
90 );
91
92 //=========================================================================
93 // Imported from Linux kernel include/asm-ppc/am860.h
94 // Copyright (c) 2002 Gary Thomas (gary@chez-thomas.org)
95 // Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
96 // Used with permission of author(s).
97
98
99 /* A Board Information structure that is given to a program when
100 * RedBoot starts it up.
101 */
102 typedef struct bd_info {
103 unsigned int bi_tag; /* Should be 0x42444944 "BDID" */
104 unsigned int bi_size; /* Size of this structure */
105 unsigned int bi_revision; /* revision of this structure */
106 unsigned int bi_bdate; /* EPPCbug date, i.e. 0x11061997 */
107 unsigned int bi_memstart; /* Memory start address */
108 unsigned int bi_memsize; /* Memory (end) size in bytes */
109 unsigned int bi_intfreq; /* Internal Freq, in Hz */
110 unsigned int bi_busfreq; /* Bus Freq, in Hz */
111 unsigned int bi_clun; /* Boot device controller */
112 unsigned int bi_dlun; /* Boot device logical dev */
113 unsigned char bi_enetaddr[6];
114 unsigned int bi_baudrate;
115 unsigned char *bi_cmdline;
116 } bd_t;
117
118 //
119 // Execute a Linux kernel - this is a RedBoot CLI command
120 //
121 static void
122 do_exec(int argc, char *argv[])
123 {
124 unsigned long entry;
125 bool wait_time_set, cmd_line_set;
126 int wait_time;
127 char *cmd_line;
128 char *cline;
129 struct option_info opts[2];
130 hal_virtual_comm_table_t *__chan;
131 int baud_rate;
132
133 bd_t *board_info;
134 CYG_INTERRUPT_STATE oldints;
135 unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE;
136
137 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
138 (void **)&wait_time, (bool *)&wait_time_set, "wait timeout");
139 init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR,
140 (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
141 entry = entry_address; // Default from last 'load' operation
142 if (!scan_opts(argc, argv, 1, opts, 2, (void *)&entry, OPTION_ARG_TYPE_NUM,
143 "[physical] starting address")) {
144 return;
145 }
146
147 // Determine baud rate on current console
148 __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
149 baud_rate = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_GETBAUD);
150 if (baud_rate <= 0) {
151 baud_rate = CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD;
152 }
153
154 // Make a little space at the top of the stack, and align to
155 // 64-bit boundary.
156 sp = (sp-128) & ~7; // The Linux boot code uses this space for FIFOs
157
158 // Copy the commandline onto the stack, and set the SP to just below it.
159 if (cmd_line_set) {
160 int len,i;
161
162 // get length of string
163 for( len = 0; cmd_line[len] != '\0'; len++ );
164
165 // decrement sp by length of string and align to
166 // word boundary.
167 sp = (sp-(len+1)) & ~3;
168
169 // assign this SP value to command line start
170 cline = (char *)sp;
171
172 // copy command line over.
173 for( i = 0; i < len; i++ )
174 cline[i] = cmd_line[i];
175 cline[len] = '\0';
176
177 } else {
178 cline = (char *)NULL;
179 }
180
181 // Set up parameter struct at top of stack
182 sp = sp-sizeof(bd_t);
183 board_info = (bd_t *)sp;
184 memset(board_info, sizeof(*board_info), 0);
185
186 board_info->bi_tag = 0x42444944;
187 board_info->bi_size = sizeof(board_info);
188 board_info->bi_revision = 1;
189 board_info->bi_bdate = 0x06012002;
190 board_info->bi_memstart = CYGMEM_REGION_ram;
191 board_info->bi_memsize = CYGMEM_REGION_ram_SIZE;
192 board_info->bi_intfreq = CYGHWR_HAL_POWERPC_BOARD_SPEED*1000000;
193 board_info->bi_busfreq = 66*1000000;
194 board_info->bi_clun = 0; // ????
195 board_info->bi_dlun = 0; // ????
196 board_info->bi_baudrate = baud_rate;
197 board_info->bi_cmdline = cline;
198 #ifdef CYGPKG_REDBOOT_NETWORKING
199 memcpy(board_info->bi_enetaddr, __local_enet_addr, sizeof(enet_addr_t));
200 #endif
201
202 // adjust SP to 64 bit boundary, and leave a little space
203 // between it and the commandline for PowerPC calling
204 // conventions.
205
206 sp = (sp-32)&~7;
207
208 if (wait_time_set) {
209 int script_timeout_ms = wait_time * 1000;
210 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
211 unsigned char *hold_script = script;
212 script = (unsigned char *)0;
213 #endif
214 diag_printf("About to start execution at %p - abort with ^C within %d seconds\n",
215 (void *)entry, wait_time);
216 while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
217 int res;
218 char line[80];
219 res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
220 if (res == _GETS_CTRLC) {
221 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
222 script = hold_script; // Re-enable script
223 #endif
224 return;
225 }
226 script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
227 }
228 }
229
230 // Disable interrupts
231 HAL_DISABLE_INTERRUPTS(oldints);
232
233 // Put the caches to sleep.
234 HAL_DCACHE_SYNC();
235 HAL_ICACHE_DISABLE();
236 HAL_DCACHE_DISABLE();
237 HAL_DCACHE_SYNC();
238 HAL_ICACHE_INVALIDATE_ALL();
239 HAL_DCACHE_INVALIDATE_ALL();
240
241 // diag_printf("entry %08x, sp %08x, info %08x, cmd line %08x, baud %d\n",
242 // entry, sp, board_info, cline, baud_rate);
243 // breakpoint();
244
245 // Call into Linux
246 __asm__ volatile (
247 // Start by disabling MMU - the mappings are
248 // 1-1 so this should not cause any problems
249 "mfmsr 3\n"
250 "li 4,0xFFFFFFCF\n"
251 "and 3,3,4\n"
252 "sync\n"
253 "mtmsr 3\n"
254 "sync\n"
255
256 // Now set up parameters to jump into linux
257
258 "mtlr %0\n" // set entry address in LR
259 "mr 1,%1\n" // set stack pointer
260 "mr 3,%2\n" // set board info in R3
261 "mr 4,%3\n" // set command line in R4
262 "blr \n" // jump into linux
263 :
264 : "r"(entry),"r"(sp),"r"(board_info),"r"(cline)
265 : "r3", "r4"
266
267 );
268 }
269
270 #endif // CYGSEM_REDBOOT_HAL_LINUX_BOOT
271
272 //=========================================================================
273 // EOF redboot_linux_exec.c