| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_POWERPC_TASK_SIZE_64_H |
| #define _ASM_POWERPC_TASK_SIZE_64_H |
| |
| /* |
| * 64-bit user address space can have multiple limits |
| * For now supported values are: |
| */ |
| #define TASK_SIZE_64TB (0x0000400000000000UL) |
| #define TASK_SIZE_128TB (0x0000800000000000UL) |
| #define TASK_SIZE_512TB (0x0002000000000000UL) |
| #define TASK_SIZE_1PB (0x0004000000000000UL) |
| #define TASK_SIZE_2PB (0x0008000000000000UL) |
| |
| /* |
| * With 52 bits in the address we can support up to 4PB of range. |
| */ |
| #define TASK_SIZE_4PB (0x0010000000000000UL) |
| |
| /* |
| * For now 512TB is only supported with book3s and 64K linux page size. |
| */ |
| #ifdef CONFIG_PPC_64K_PAGES |
| /* |
| * Max value currently used: |
| */ |
| #define TASK_SIZE_USER64 TASK_SIZE_4PB |
| #define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_128TB |
| #define TASK_CONTEXT_SIZE TASK_SIZE_512TB |
| #else |
| #define TASK_SIZE_USER64 TASK_SIZE_64TB |
| #define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_64TB |
| |
| /* |
| * We don't need to allocate extended context ids for 4K page size, because we |
| * limit the max effective address on this config to 64TB. |
| */ |
| #define TASK_CONTEXT_SIZE TASK_SIZE_64TB |
| #endif |
| |
| /* |
| * 32-bit user address space is 4GB - 1 page |
| * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT |
| */ |
| #define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE)) |
| |
| #define TASK_SIZE_OF(tsk) \ |
| (test_tsk_thread_flag(tsk, TIF_32BIT) ? TASK_SIZE_USER32 : \ |
| TASK_SIZE_USER64) |
| |
| #define TASK_SIZE TASK_SIZE_OF(current) |
| |
| #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4)) |
| #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4)) |
| |
| /* |
| * This decides where the kernel will search for a free chunk of vm space during |
| * mmap's. |
| */ |
| #define TASK_UNMAPPED_BASE \ |
| ((is_32bit_task()) ? TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64) |
| |
| /* |
| * Initial task size value for user applications. For book3s 64 we start |
| * with 128TB and conditionally enable upto 512TB |
| */ |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| #define DEFAULT_MAP_WINDOW \ |
| ((is_32bit_task()) ? TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64) |
| #else |
| #define DEFAULT_MAP_WINDOW TASK_SIZE |
| #endif |
| |
| #define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64 |
| #define STACK_TOP_USER32 TASK_SIZE_USER32 |
| #define STACK_TOP_MAX TASK_SIZE_USER64 |
| #define STACK_TOP (is_32bit_task() ? STACK_TOP_USER32 : STACK_TOP_USER64) |
| |
| #endif /* _ASM_POWERPC_TASK_SIZE_64_H */ |
