source: rtems/bsps/arm/altera-cyclone-v/start/bspgetworkarea.c @ eea21eac

5
Last change on this file since eea21eac was eea21eac, checked in by Sebastian Huber <sebastian.huber@…>, on Dec 13, 2019 at 5:18:36 AM

bsps: Rework work area initialization

The work area initialization was done by the BSP through
bsp_work_area_initialize(). This approach predated the system
initialization through the system initialization linker set. The
workspace and C program heap were unconditionally initialized. The aim
is to support RTEMS application configurations which do not need the
workspace and C program heap. In these configurations, the workspace
and C prgram heap should not get initialized.

Change all bsp_work_area_initialize() to implement _Memory_Get()
instead. Move the dirty memory, sbrk(), per-CPU data, workspace, and
malloc() heap initialization into separate system initialization steps.
This makes it also easier to test the individual initialization steps.

This change adds a dependency to _Heap_Extend() to all BSPs. This
dependency will be removed in a follow up change.

Update #3838.

  • Property mode set to 100644
File size: 4.2 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup RTEMSBSPsARMCycV
5 */
6
7/*
8 * Copyright (c) 2017, 2019 embedded brains GmbH
9 *
10 * The license and distribution terms for this file may be
11 * found in the file LICENSE in this distribution or at
12 * http://www.rtems.org/license/LICENSE.
13 */
14
15#include <bsp/bootcard.h>
16#include <bsp/fdt.h>
17#include <bsp/linker-symbols.h>
18
19#ifdef BSP_FDT_IS_SUPPORTED
20
21#include <bsp/arm-cp15-start.h>
22
23#include <libcpu/arm-cp15.h>
24
25#include <libfdt.h>
26
27#include <rtems/sysinit.h>
28
29#define AREA_COUNT_MAX 16
30
31static const char memory_path[] = "/memory";
32
33static const char reserved_memory_path[] = "/reserved-memory";
34
35static void adjust_memory_size(const void *fdt, Memory_Area *area)
36{
37  int node;
38
39  node = fdt_path_offset_namelen(
40    fdt,
41    memory_path,
42    (int) sizeof(memory_path) - 1
43  );
44
45  if (node >= 0) {
46    int len;
47    const void *val;
48    uintptr_t begin;
49    uintptr_t size;
50    uintptr_t a_bit;
51
52    val = fdt_getprop(fdt, node, "reg", &len);
53    if (len == 8) {
54      begin = fdt32_to_cpu(((fdt32_t *) val)[0]);
55      size = fdt32_to_cpu(((fdt32_t *) val)[1]);
56    } else {
57      begin = 0;
58      size = 0;
59    }
60
61    /*
62     * Remove a bit to avoid problems with speculative memory accesses beyond
63     * the valid memory area.
64     */
65    a_bit = 0x100000;
66    if (size >= a_bit) {
67      size -= a_bit;
68    }
69
70    if (
71      begin == 0
72        && size > (uintptr_t) bsp_section_work_end
73        && (uintptr_t) bsp_section_nocache_end
74          < (uintptr_t) bsp_section_work_end
75    ) {
76      _Memory_Set_end(area, (void *) (begin + size));
77    }
78  }
79}
80
81static Memory_Area *find_area(
82  Memory_Area *areas,
83  size_t area_count,
84  uint32_t begin
85)
86{
87  size_t i;
88
89  for (i = 0; i < area_count; ++i) {
90    uintptr_t b;
91    uintptr_t e;
92
93    b = (uintptr_t) _Memory_Get_begin(&areas[i]);
94    e = (uintptr_t) _Memory_Get_end(&areas[i]);
95
96    if (b <= begin && begin < e) {
97      return &areas[i];
98    }
99  }
100
101  return NULL;
102}
103
104static size_t remove_reserved_memory(
105  const void *fdt,
106  Memory_Area *areas,
107  size_t area_count
108)
109{
110  int node;
111
112  node = fdt_path_offset_namelen(
113    fdt,
114    reserved_memory_path,
115    (int) sizeof(reserved_memory_path) - 1
116  );
117
118  if (node >= 0) {
119    node = fdt_first_subnode(fdt, node);
120
121    while (node >= 0) {
122      int len;
123      const void *val;
124      uintptr_t area_end;
125      uintptr_t hole_begin;
126      uintptr_t hole_end;
127      Memory_Area *area;
128
129      val = fdt_getprop(fdt, node, "reg", &len);
130      if (len == 8) {
131        hole_begin = fdt32_to_cpu(((fdt32_t *) val)[0]);
132        hole_end = hole_begin + fdt32_to_cpu(((fdt32_t *) val)[1]);
133      } else {
134        rtems_panic("unexpected reserved memory area");
135      }
136
137      area = find_area(areas, area_count, hole_begin);
138      area_end = (uintptr_t) _Memory_Get_end(area);
139      _Memory_Set_end(area, (void *) hole_end);
140
141      if (hole_end <= area_end) {
142        if (area_count >= AREA_COUNT_MAX) {
143          rtems_panic("too many reserved memory areas");
144        }
145
146        area = &areas[area_count];
147        ++area_count;
148        _Memory_Initialize(area, (void *) hole_end, (void *) area_end);
149      }
150
151      node = fdt_next_subnode(fdt, node);
152    }
153  }
154
155  return area_count;
156}
157
158static Memory_Area _Memory_Areas[AREA_COUNT_MAX];
159
160static void bsp_memory_initialize(void)
161{
162  size_t area_count;
163  const void *fdt;
164  size_t i;
165
166  _Memory_Initialize(
167    &_Memory_Areas[0],
168    bsp_section_work_begin,
169    bsp_section_work_end
170  );
171
172  area_count = 1;
173  fdt = bsp_fdt_get();
174  adjust_memory_size(fdt, &_Memory_Areas[0]);
175  area_count = remove_reserved_memory(fdt, &_Memory_Areas[0], area_count);
176
177  for (i = 0; i < area_count; ++i) {
178    arm_cp15_set_translation_table_entries(
179      _Memory_Get_begin(&_Memory_Areas[i]),
180      _Memory_Get_end(&_Memory_Areas[i]),
181      ARMV7_MMU_READ_WRITE_CACHED
182    );
183  }
184}
185
186RTEMS_SYSINIT_ITEM(
187  bsp_memory_initialize,
188  RTEMS_SYSINIT_MEMORY,
189  RTEMS_SYSINIT_ORDER_MIDDLE
190);
191
192#else /* !BSP_FDT_IS_SUPPORTED */
193
194static Memory_Area _Memory_Areas[] = {
195  MEMORY_INITIALIZER(bsp_section_work_begin, bsp_section_work_end)
196};
197
198#endif /* BSP_FDT_IS_SUPPORTED */
199
200static const Memory_Information _Memory_Information =
201  MEMORY_INFORMATION_INITIALIZER( _Memory_Areas );
202
203const Memory_Information *_Memory_Get( void )
204{
205  return &_Memory_Information;
206}
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