qemu/linux-user/x86_64/target_mman.h

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/*
* arch/x86/include/asm/processor.h:
* TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
* __TASK_UNMAPPED_BASE(S) PAGE_ALIGN(S / 3)
*
* arch/x86/include/asm/page_64_types.h:
* TASK_SIZE_LOW DEFAULT_MAP_WINDOW
* DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
*/
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1ull << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
/* arch/x86/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"