| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_X86_PAGE_32_DEFS_H |
| #define _ASM_X86_PAGE_32_DEFS_H |
| |
| #include <linux/const.h> |
| |
| /* |
| * This handles the memory map. |
| * |
| * A __PAGE_OFFSET of 0xC0000000 means that the kernel has |
| * a virtual address space of one gigabyte, which limits the |
| * amount of physical memory you can use to about 950MB. |
| * |
| * If you want more physical memory than this then see the CONFIG_HIGHMEM4G |
| * and CONFIG_HIGHMEM64G options in the kernel configuration. |
| */ |
| #define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL) |
| #define __PAGE_OFFSET __PAGE_OFFSET_BASE |
| |
| #define __START_KERNEL_map __PAGE_OFFSET |
| |
| #define THREAD_SIZE_ORDER 1 |
| #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
| |
| #define IRQ_STACK_SIZE THREAD_SIZE |
| |
| #define N_EXCEPTION_STACKS 1 |
| |
| #ifdef CONFIG_X86_PAE |
| /* |
| * This is beyond the 44 bit limit imposed by the 32bit long pfns, |
| * but we need the full mask to make sure inverted PROT_NONE |
| * entries have all the host bits set in a guest. |
| * The real limit is still 44 bits. |
| */ |
| #define __PHYSICAL_MASK_SHIFT 52 |
| #define __VIRTUAL_MASK_SHIFT 32 |
| |
| #else /* !CONFIG_X86_PAE */ |
| #define __PHYSICAL_MASK_SHIFT 32 |
| #define __VIRTUAL_MASK_SHIFT 32 |
| #endif /* CONFIG_X86_PAE */ |
| |
| /* |
| * User space process size: 3GB (default). |
| */ |
| #define IA32_PAGE_OFFSET __PAGE_OFFSET |
| #define TASK_SIZE __PAGE_OFFSET |
| #define TASK_SIZE_LOW TASK_SIZE |
| #define TASK_SIZE_MAX TASK_SIZE |
| #define DEFAULT_MAP_WINDOW TASK_SIZE |
| #define STACK_TOP TASK_SIZE |
| #define STACK_TOP_MAX STACK_TOP |
| |
| /* |
| * In spite of the name, KERNEL_IMAGE_SIZE is a limit on the maximum virtual |
| * address for the kernel image, rather than the limit on the size itself. On |
| * 32-bit, this is not a strict limit, but this value is used to limit the |
| * link-time virtual address range of the kernel, and by KASLR to limit the |
| * randomized address from which the kernel is executed. A relocatable kernel |
| * can be loaded somewhat higher than KERNEL_IMAGE_SIZE as long as enough space |
| * remains for the vmalloc area. |
| */ |
| #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * This much address space is reserved for vmalloc() and iomap() |
| * as well as fixmap mappings. |
| */ |
| extern unsigned int __VMALLOC_RESERVE; |
| extern int sysctl_legacy_va_layout; |
| |
| extern void find_low_pfn_range(void); |
| extern void setup_bootmem_allocator(void); |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* _ASM_X86_PAGE_32_DEFS_H */ |