| /* |
| * Copyright (c) 2023 Nordic Semiconductor ASA |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /* |
| * DESCRIPTION |
| * Platform independent set of macros for creating a memory segment for |
| * aggregating data that shall be kept in the elf file but not in the binary. |
| */ |
| |
| #ifndef ZEPHYR_INCLUDE_LINKER_LINKER_DEVNULL_H_ |
| |
| #if defined(CONFIG_LINKER_DEVNULL_MEMORY) |
| |
| #if defined(CONFIG_XIP) |
| #if (!defined(ROM_ADDR) && !defined(ROM_BASE)) || !defined(ROM_SIZE) |
| #error "ROM_SIZE, ROM_ADDR or ROM_BASE not defined" |
| #endif |
| #endif /* CONFIG_XIP */ |
| |
| #if (!defined(RAM_ADDR) && !defined(RAM_BASE)) || !defined(RAM_SIZE) |
| #error "RAM_SIZE, RAM_ADDR or RAM_BASE not defined" |
| #endif |
| |
| #if defined(CONFIG_XIP) && !defined(ROM_ADDR) |
| #define ROM_ADDR ROM_BASE |
| #endif |
| |
| #if !defined(RAM_ADDR) |
| #define RAM_ADDR RAM_BASE |
| #endif |
| |
| #define ROM_END_ADDR (ROM_ADDR + ROM_SIZE) |
| #define DEVNULL_SIZE CONFIG_LINKER_DEVNULL_MEMORY_SIZE |
| #define ROM_DEVNULL_END_ADDR (ROM_END_ADDR + DEVNULL_SIZE) |
| #define MAX_ADDR UINT32_MAX |
| |
| /* Determine where to put the devnull region. It should be adjacent to the ROM |
| * region. If ROM starts after RAM or the distance between ROM and RAM is big |
| * enough to fit the devnull region then devnull region is placed just after |
| * the ROM region. If it cannot be done then the devnull region is placed before |
| * the ROM region. It is possible that the devnull region cannot be placed |
| * adjacent to the ROM (e.g. ROM starts at 0 and RAM follows ROM). In that |
| * case compilation fails and the devnull region is not supported in that |
| * configuration. |
| */ |
| #if !defined(CONFIG_XIP) |
| |
| #if RAM_ADDR >= DEVNULL_SIZE |
| #define DEVNULL_ADDR (RAM_ADDR - DEVNULL_SIZE) |
| #else |
| #define DEVNULL_ADDR (RAM_ADDR + RAM_SIZE) |
| #endif |
| |
| #else /* CONFIG_XIP */ |
| |
| #if ((ROM_ADDR > RAM_ADDR) && ((MAX_ADDR - ROM_END_ADDR) >= DEVNULL_SIZE)) || \ |
| ((ROM_END_ADDR + DEVNULL_SIZE) <= RAM_ADDR) |
| #define DEVNULL_ADDR ROM_END_ADDR |
| #elif ROM_ADDR > DEVNULL_SIZE |
| #define DEVNULL_ADDR (ROM_ADDR - DEVNULL_SIZE) |
| #else |
| #error "Cannot place devnull segment adjacent to ROM region." |
| #endif |
| |
| #endif /* CONFIG_XIP */ |
| |
| #define DEVNULL_REGION DEVNULL_ROM |
| |
| #endif /* CONFIG_LINKER_DEVNULL_MEMORY */ |
| |
| #endif /* ZEPHYR_INCLUDE_LINKER_LINKER_DEVNULL_H_ */ |
