1/* 2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <platform_def.h> 32 33OUTPUT_FORMAT(PLATFORM_LINKER_FORMAT) 34OUTPUT_ARCH(PLATFORM_LINKER_ARCH) 35ENTRY(bl31_entrypoint) 36 37 38MEMORY { 39 RAM (rwx): ORIGIN = BL31_BASE, LENGTH = BL31_LIMIT - BL31_BASE 40} 41 42 43SECTIONS 44{ 45 . = BL31_BASE; 46 ASSERT(. == ALIGN(4096), 47 "BL31_BASE address is not aligned on a page boundary.") 48 49 ro . : { 50 __RO_START__ = .; 51 *bl31_entrypoint.o(.text*) 52 *(.text*) 53 *(.rodata*) 54 55 /* Ensure 8-byte alignment for descriptors and ensure inclusion */ 56 . = ALIGN(8); 57 __RT_SVC_DESCS_START__ = .; 58 KEEP(*(rt_svc_descs)) 59 __RT_SVC_DESCS_END__ = .; 60 61 /* 62 * Ensure 8-byte alignment for cpu_ops so that its fields are also 63 * aligned. Also ensure cpu_ops inclusion. 64 */ 65 . = ALIGN(8); 66 __CPU_OPS_START__ = .; 67 KEEP(*(cpu_ops)) 68 __CPU_OPS_END__ = .; 69 70 *(.vectors) 71 __RO_END_UNALIGNED__ = .; 72 /* 73 * Memory page(s) mapped to this section will be marked as read-only, 74 * executable. No RW data from the next section must creep in. 75 * Ensure the rest of the current memory page is unused. 76 */ 77 . = NEXT(4096); 78 __RO_END__ = .; 79 } >RAM 80 81 ASSERT(__CPU_OPS_END__ > __CPU_OPS_START__, 82 "cpu_ops not defined for this platform.") 83 84 /* 85 * Define a linker symbol to mark start of the RW memory area for this 86 * image. 87 */ 88 __RW_START__ = . ; 89 90 .data . : { 91 __DATA_START__ = .; 92 *(.data*) 93 __DATA_END__ = .; 94 } >RAM 95 96#ifdef BL31_PROGBITS_LIMIT 97 ASSERT(. <= BL31_PROGBITS_LIMIT, "BL31 progbits has exceeded its limit.") 98#endif 99 100 stacks (NOLOAD) : { 101 __STACKS_START__ = .; 102 *(tzfw_normal_stacks) 103 __STACKS_END__ = .; 104 } >RAM 105 106 /* 107 * The .bss section gets initialised to 0 at runtime. 108 * Its base address must be 16-byte aligned. 109 */ 110 .bss (NOLOAD) : ALIGN(16) { 111 __BSS_START__ = .; 112 *(.bss*) 113 *(COMMON) 114#if !USE_COHERENT_MEM 115 /* 116 * Bakery locks are stored in normal .bss memory 117 * 118 * Each lock's data is spread across multiple cache lines, one per CPU, 119 * but multiple locks can share the same cache line. 120 * The compiler will allocate enough memory for one CPU's bakery locks, 121 * the remaining cache lines are allocated by the linker script 122 */ 123 . = ALIGN(CACHE_WRITEBACK_GRANULE); 124 __BAKERY_LOCK_START__ = .; 125 *(bakery_lock) 126 . = ALIGN(CACHE_WRITEBACK_GRANULE); 127 __PERCPU_BAKERY_LOCK_SIZE__ = ABSOLUTE(. - __BAKERY_LOCK_START__); 128 . = . + (__PERCPU_BAKERY_LOCK_SIZE__ * (PLATFORM_CORE_COUNT - 1)); 129 __BAKERY_LOCK_END__ = .; 130#ifdef PLAT_PERCPU_BAKERY_LOCK_SIZE 131 ASSERT(__PERCPU_BAKERY_LOCK_SIZE__ == PLAT_PERCPU_BAKERY_LOCK_SIZE, 132 "PLAT_PERCPU_BAKERY_LOCK_SIZE does not match bakery lock requirements"); 133#endif 134#endif 135 __BSS_END__ = .; 136 } >RAM 137 138 /* 139 * The xlat_table section is for full, aligned page tables (4K). 140 * Removing them from .bss avoids forcing 4K alignment on 141 * the .bss section and eliminates the unecessary zero init 142 */ 143 xlat_table (NOLOAD) : { 144 *(xlat_table) 145 } >RAM 146 147#if USE_COHERENT_MEM 148 /* 149 * The base address of the coherent memory section must be page-aligned (4K) 150 * to guarantee that the coherent data are stored on their own pages and 151 * are not mixed with normal data. This is required to set up the correct 152 * memory attributes for the coherent data page tables. 153 */ 154 coherent_ram (NOLOAD) : ALIGN(4096) { 155 __COHERENT_RAM_START__ = .; 156 /* 157 * Bakery locks are stored in coherent memory 158 * 159 * Each lock's data is contiguous and fully allocated by the compiler 160 */ 161 *(bakery_lock) 162 *(tzfw_coherent_mem) 163 __COHERENT_RAM_END_UNALIGNED__ = .; 164 /* 165 * Memory page(s) mapped to this section will be marked 166 * as device memory. No other unexpected data must creep in. 167 * Ensure the rest of the current memory page is unused. 168 */ 169 . = NEXT(4096); 170 __COHERENT_RAM_END__ = .; 171 } >RAM 172#endif 173 174 /* 175 * Define a linker symbol to mark end of the RW memory area for this 176 * image. 177 */ 178 __RW_END__ = .; 179 __BL31_END__ = .; 180 181 __BSS_SIZE__ = SIZEOF(.bss); 182#if USE_COHERENT_MEM 183 __COHERENT_RAM_UNALIGNED_SIZE__ = 184 __COHERENT_RAM_END_UNALIGNED__ - __COHERENT_RAM_START__; 185#endif 186 187 ASSERT(. <= BL31_LIMIT, "BL31 image has exceeded its limit.") 188} 189