source: rtems/c/src/lib/libbsp/powerpc/gen83xx/startup/bspstart.c @ dde1fedb

4.104.114.95
Last change on this file since dde1fedb was dde1fedb, checked in by Joel Sherrill <joel.sherrill@…>, on May 15, 2008 at 3:55:28 PM

2008-05-15 Joel Sherrill <joel.sherrill@…>

  • startup/bspstart.c: Add capability for bootcard.c BSP Initialization Framework to ask the BSP where it has memory for the RTEMS Workspace and C Program Heap. These collectively are referred to as work area. If the BSP supports this, then it does not have to include code to split the available memory between the two areas. This reduces the amount of code in the BSP specific bspstart.c file. Additionally, the shared framework can initialize the C Library, call rtems_debug_enable(), and dirty the work area memory. Until most/all BSPs support this new capability, if the BSP supports this, it should call RTEMS_BSP_BOOTCARD_HANDLES_RAM_ALLOCATION from its configure.ac. When the transition is complete, this autoconf macro can be removed.
  • Property mode set to 100644
File size: 6.1 KB
Line 
1/*===============================================================*\
2| Project: RTEMS generic MPC83xx BSP                              |
3+-----------------------------------------------------------------+
4|                    Copyright (c) 2007                           |
5|                    Embedded Brains GmbH                         |
6|                    Obere Lagerstr. 30                           |
7|                    D-82178 Puchheim                             |
8|                    Germany                                      |
9|                    rtems@embedded-brains.de                     |
10+-----------------------------------------------------------------+
11| The license and distribution terms for this file may be         |
12| found in the file LICENSE in this distribution or at            |
13|                                                                 |
14| http://www.rtems.com/license/LICENSE.                           |
15|                                                                 |
16+-----------------------------------------------------------------+
17| this file contains the BSP startup code                         |
18\*===============================================================*/
19
20/*
21 *  $Id$
22 */
23
24#include <bsp.h>
25
26#include <rtems/libio.h>
27#include <rtems/libcsupport.h>
28#include <rtems/powerpc/powerpc.h>
29#include <rtems/score/thread.h>
30
31#include <rtems/bspIo.h>
32#include <libcpu/cpuIdent.h>
33#include <libcpu/spr.h>
34#include <bsp/irq.h>
35
36#include <string.h>
37
38SPR_RW(SPRG0)
39SPR_RW(SPRG1)
40
41extern unsigned long intrStackPtr;
42static char *BSP_heap_start, *BSP_heap_end;
43
44/*
45 * constants for c_clock driver:
46 * system bus frequency (for timebase etc)
47 * and
48 * Time base divisior: scaling value:
49 * BSP_time_base_divisor = TB ticks per millisecond/BSP_bus_frequency
50 */
51unsigned int BSP_bus_frequency;
52unsigned int BSP_time_base_divisor = 4000;  /* 4 bus clicks per TB click */
53
54/*
55 *  Driver configuration parameters
56 */
57uint32_t   bsp_clicks_per_usec;
58
59/*
60 *  Use the shared implementations of the following routines.
61 *  Look in rtems/c/src/lib/libbsp/shared/bsplibc.c.
62 */
63void bsp_libc_init( void *, uint32_t, int );
64extern void initialize_exceptions(void);
65extern void cpu_init(void);
66
67void BSP_panic(char *s)
68  {
69  printk("%s PANIC %s\n",_RTEMS_version, s);
70  /*
71   * FIXME: hang/restart system
72   */
73  __asm__ __volatile ("sc");
74  }
75
76void _BSP_Fatal_error(unsigned int v)
77  {
78  printk("%s PANIC ERROR %x\n",_RTEMS_version, v);
79  /*
80   * FIXME: hang/restart system
81   */
82  __asm__ __volatile ("sc");
83  }
84
85/*
86 *  Function:   bsp_pretasking_hook
87 *  Created:    95/03/10
88 *
89 *  Description:
90 *      BSP pretasking hook.  Called just before drivers are initialized.
91 *      Used to setup libc and install any BSP extensions.
92 *
93 *  NOTES:
94 *      Must not use libc (to do io) from here, since drivers are
95 *      not yet initialized.
96 *
97 */
98
99void
100bsp_pretasking_hook(void)
101{
102
103  /*
104   * initialize libc including the heap
105   */
106  bsp_libc_init( BSP_heap_start, 
107                 BSP_heap_end - BSP_heap_start,
108                 0);
109}
110
111void bsp_calc_mem_layout()
112{
113  /*
114   * these labels (!) are defined in the linker command file
115   * or when the linker is invoked
116   * NOTE: the information(size) is the address of the object,
117   * not the object otself
118   */
119  extern unsigned char TopRamReserved;
120  extern unsigned char _WorkspaceBase[];
121
122  /*
123   * compute the memory layout:
124   * - first unused address is Workspace start
125   * - Heap starts at end of workspace
126   * - Heap ends at end of memory - reserved memory area
127   */
128  Configuration.work_space_start = _WorkspaceBase;
129
130  BSP_heap_start = ((char *)Configuration.work_space_start +
131                    rtems_configuration_get_work_space_size());
132
133#if defined(HAS_UBOOT)
134  BSP_heap_end = (uboot_bdinfo_ptr->bi_memstart
135                  + uboot_bdinfo_ptr->bi_memsize
136                  - (uint32_t)&TopRamReserved);
137#else
138  BSP_heap_end = (void *)(RAM_END - (uint32_t)&TopRamReserved);
139#endif
140
141}
142
143
144void bsp_start(void)
145{
146  ppc_cpu_id_t myCpu;
147  ppc_cpu_revision_t myCpuRevision;
148  register unsigned char* intrStack;
149
150  /*
151   * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function
152   * store the result in global variables so that it can be used latter...
153   */
154  myCpu             = get_ppc_cpu_type();
155  myCpuRevision = get_ppc_cpu_revision();
156  /*
157   * determine heap and workspace placement
158   */
159  bsp_calc_mem_layout();
160
161  cpu_init();
162
163  /*
164   * Initialize some SPRG registers related to irq handling
165   */
166
167  intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE);
168
169  _write_SPRG1((unsigned int)intrStack);
170
171  /* Signal them that this BSP has fixed PR288 - eventually, this should
172   * go away
173   */
174  _write_SPRG0(PPC_BSP_HAS_FIXED_PR288);
175
176  /*
177   * this is evaluated during runtime, so it should be ok to set it
178   * before we initialize the drivers
179   */
180  BSP_bus_frequency   = BSP_CLKIN_FRQ * BSP_SYSPLL_MF / BSP_SYSPLL_CKID;
181  /*
182   *  initialize the device driver parameters
183   */
184  bsp_clicks_per_usec = (BSP_bus_frequency/1000000);
185
186  /*
187   * Install our own set of exception vectors
188   */
189
190  initialize_exceptions();
191
192  /*
193   * Enable instruction and data caches. Do not force writethrough mode.
194   */
195#if INSTRUCTION_CACHE_ENABLE
196  rtems_cache_enable_instruction();
197#endif
198#if DATA_CACHE_ENABLE
199  rtems_cache_enable_data();
200#endif
201
202  /*
203   *  Allocate the memory for the RTEMS Work Space.  This can come from
204   *  a variety of places: hard coded address, malloc'ed from outside
205   *  RTEMS world (e.g. simulator or primitive memory manager), or (as
206   *  typically done by stock BSPs) by subtracting the required amount
207   *  of work space from the last physical address on the CPU board.
208   */
209
210  /*
211   * Initalize RTEMS IRQ system
212   */
213  BSP_rtems_irq_mng_init(0);
214
215#ifdef SHOW_MORE_INIT_SETTINGS
216  printk("Exit from bspstart\n");
217#endif
218
219  }
220
221/*
222 *
223 *  _Thread_Idle_body
224 *
225 *  Replaces the one in c/src/exec/score/src/threadidlebody.c
226 *  The MSR[POW] bit is set to put the CPU into the low power mode
227 *  defined in HID0.  HID0 is set during starup in start.S.
228 *
229 */
230Thread _Thread_Idle_body(uint32_t ignored )
231  {
232
233  for(;;)
234    {
235
236    asm volatile("mfmsr 3; oris 3,3,4; sync; mtmsr 3; isync; ori 3,3,0; ori 3,3,0");
237
238    }
239
240  return 0;
241
242  }
243
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