[9d41fca] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup RTEMSBSPsARMCycV |
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| 5 | */ |
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| 6 | |
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[f0e5e17] | 7 | /* |
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| 8 | * Copyright (c) 2017 embedded brains GmbH |
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| 9 | * |
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| 10 | * The license and distribution terms for this file may be |
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| 11 | * found in the file LICENSE in this distribution or at |
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| 12 | * http://www.rtems.org/license/LICENSE. |
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| 13 | */ |
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| 14 | |
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| 15 | #include <bsp/bootcard.h> |
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| 16 | #include <bsp/arm-cp15-start.h> |
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| 17 | #include <bsp/fdt.h> |
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| 18 | #include <bsp/linker-symbols.h> |
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| 19 | |
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| 20 | #include <libcpu/arm-cp15.h> |
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| 21 | |
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| 22 | #include <libfdt.h> |
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| 23 | |
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[43fbb50f] | 24 | #ifdef BSP_FDT_IS_SUPPORTED |
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| 25 | |
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[f0e5e17] | 26 | #define AREA_COUNT_MAX 16 |
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| 27 | |
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| 28 | static const char memory_path[] = "/memory"; |
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| 29 | |
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[94f3c2db] | 30 | static const char reserved_memory_path[] = "/reserved-memory"; |
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| 31 | |
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[f0e5e17] | 32 | static void adjust_memory_size(const void *fdt, Heap_Area *area) |
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| 33 | { |
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| 34 | int node; |
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| 35 | |
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| 36 | node = fdt_path_offset_namelen( |
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| 37 | fdt, |
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| 38 | memory_path, |
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| 39 | (int) sizeof(memory_path) - 1 |
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| 40 | ); |
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| 41 | |
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| 42 | if (node >= 0) { |
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| 43 | int len; |
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| 44 | const void *val; |
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| 45 | uintptr_t begin; |
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| 46 | uintptr_t size; |
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| 47 | uintptr_t a_bit; |
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| 48 | |
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| 49 | val = fdt_getprop(fdt, node, "reg", &len); |
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| 50 | if (len == 8) { |
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| 51 | begin = fdt32_to_cpu(((fdt32_t *) val)[0]); |
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| 52 | size = fdt32_to_cpu(((fdt32_t *) val)[1]); |
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| 53 | } else { |
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| 54 | begin = 0; |
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| 55 | size = 0; |
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| 56 | } |
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| 57 | |
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| 58 | /* |
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| 59 | * Remove a bit to avoid problems with speculative memory accesses beyond |
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| 60 | * the valid memory area. |
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| 61 | */ |
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| 62 | a_bit = 0x100000; |
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| 63 | if (size >= a_bit) { |
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| 64 | size -= a_bit; |
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| 65 | } |
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| 66 | |
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| 67 | if ( |
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| 68 | begin == 0 |
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| 69 | && size > (uintptr_t) bsp_section_work_end |
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| 70 | && (uintptr_t) bsp_section_nocache_end |
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| 71 | < (uintptr_t) bsp_section_work_end |
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| 72 | ) { |
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| 73 | area->size += size - (uintptr_t) bsp_section_work_end; |
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| 74 | } |
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| 75 | } |
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| 76 | } |
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| 77 | |
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[94f3c2db] | 78 | static Heap_Area *find_area( |
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| 79 | Heap_Area *areas, |
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| 80 | size_t area_count, |
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| 81 | uint32_t begin |
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| 82 | ) |
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| 83 | { |
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| 84 | size_t i; |
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| 85 | |
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| 86 | for (i = 0; i < area_count; ++i) { |
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| 87 | uintptr_t b; |
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| 88 | uintptr_t e; |
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| 89 | |
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| 90 | b = (uintptr_t) areas[i].begin; |
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| 91 | e = b + (uintptr_t) areas[i].size; |
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| 92 | |
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| 93 | if (b <= begin && begin < e) { |
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| 94 | return &areas[i]; |
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| 95 | } |
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| 96 | } |
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| 97 | |
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| 98 | return NULL; |
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| 99 | } |
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| 100 | |
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| 101 | static size_t remove_reserved_memory( |
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| 102 | const void *fdt, |
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| 103 | Heap_Area *areas, |
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| 104 | size_t area_count |
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| 105 | ) |
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| 106 | { |
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| 107 | int node; |
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| 108 | |
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| 109 | node = fdt_path_offset_namelen( |
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| 110 | fdt, |
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| 111 | reserved_memory_path, |
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| 112 | (int) sizeof(reserved_memory_path) - 1 |
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| 113 | ); |
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| 114 | |
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| 115 | if (node >= 0) { |
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| 116 | node = fdt_first_subnode(fdt, node); |
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| 117 | |
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| 118 | while (node >= 0) { |
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| 119 | int len; |
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| 120 | const void *val; |
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| 121 | uintptr_t area_begin; |
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| 122 | uintptr_t area_end; |
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| 123 | uintptr_t hole_begin; |
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| 124 | uintptr_t hole_end; |
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| 125 | Heap_Area *area; |
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| 126 | |
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| 127 | val = fdt_getprop(fdt, node, "reg", &len); |
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| 128 | if (len == 8) { |
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| 129 | hole_begin = fdt32_to_cpu(((fdt32_t *) val)[0]); |
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| 130 | hole_end = hole_begin + fdt32_to_cpu(((fdt32_t *) val)[1]); |
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| 131 | } else { |
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| 132 | rtems_panic("unexpected reserved memory area"); |
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| 133 | } |
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| 134 | |
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| 135 | area = find_area(areas, area_count, hole_begin); |
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| 136 | area_begin = (uintptr_t) area->begin; |
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| 137 | area_end = area_begin + (uintptr_t) area->size; |
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| 138 | area->size = hole_begin - area_begin; |
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| 139 | |
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| 140 | if (hole_end <= area_end) { |
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| 141 | if (area_count >= AREA_COUNT_MAX) { |
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| 142 | rtems_panic("too many reserved memory areas"); |
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| 143 | } |
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| 144 | |
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| 145 | area = &areas[area_count]; |
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| 146 | ++area_count; |
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| 147 | area->begin = (void *) hole_end; |
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| 148 | area->size = area_end - hole_end; |
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| 149 | } |
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| 150 | |
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| 151 | node = fdt_next_subnode(fdt, node); |
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| 152 | } |
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| 153 | } |
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| 154 | |
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| 155 | return area_count; |
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| 156 | } |
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| 157 | |
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[43fbb50f] | 158 | #else /* !BSP_FDT_IS_SUPPORTED */ |
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| 159 | |
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| 160 | #define AREA_COUNT_MAX 1 |
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| 161 | |
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| 162 | #endif /* BSP_FDT_IS_SUPPORTED */ |
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| 163 | |
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[f0e5e17] | 164 | void bsp_work_area_initialize(void) |
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| 165 | { |
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| 166 | Heap_Area areas[AREA_COUNT_MAX]; |
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| 167 | size_t area_count; |
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[43fbb50f] | 168 | #ifdef BSP_FDT_IS_SUPPORTED |
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| 169 | const void *fdt; |
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[f0e5e17] | 170 | size_t i; |
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[43fbb50f] | 171 | #endif |
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[f0e5e17] | 172 | |
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| 173 | areas[0].begin = bsp_section_work_begin; |
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| 174 | areas[0].size = (uintptr_t) bsp_section_work_size; |
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| 175 | area_count = 1; |
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| 176 | |
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[43fbb50f] | 177 | #ifdef BSP_FDT_IS_SUPPORTED |
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[f0e5e17] | 178 | fdt = bsp_fdt_get(); |
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| 179 | |
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| 180 | adjust_memory_size(fdt, &areas[0]); |
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[94f3c2db] | 181 | area_count = remove_reserved_memory(fdt, areas, area_count); |
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[f0e5e17] | 182 | |
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| 183 | for (i = 0; i < area_count; ++i) { |
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| 184 | arm_cp15_set_translation_table_entries( |
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| 185 | areas[i].begin, |
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| 186 | (void *) ((uintptr_t) areas[i].begin + areas[i].size), |
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| 187 | ARMV7_MMU_READ_WRITE_CACHED |
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| 188 | ); |
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| 189 | } |
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[43fbb50f] | 190 | #endif |
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[f0e5e17] | 191 | |
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| 192 | bsp_work_area_initialize_with_table(areas, area_count); |
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| 193 | } |
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