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move McKernel out of Linux kernel virtual

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Cherry-pick of 88a8277f17da62d349b4340b66d37482344db649
This commit is contained in:
Balazs Gerofi
2018-02-19 10:41:12 +09:00
parent 86ae1380e4
commit cfbab0ee82
3 changed files with 41 additions and 4 deletions
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20
arch/x86_64/kernel/include/arch-memory.h
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@ -42,10 +42,24 @@
#define USER_END 0x0000800000000000UL
#define TASK_UNMAPPED_BASE 0x00002AAAAAA00000UL
/*
* Canonical negative addresses (i.e., the smallest kernel virtual address)
* on x86 64 bit mode (in its most restricted 48 bit format) starts from
* 0xffff800000000000, but Linux starts mapping physical memory at 0xffff880000000000.
* The 0x80000000000 long gap (8TBs, i.e., 16 PGD level entries in the page tables)
* is used for Xen hyervisor (see arch/x86/include/asm/page.h) and that is
* what we utilize for McKernel.
* This gives us the benefit of being able to use Linux kernel virtual
* addresses identically as in Linux.
*
* NOTE: update these also in eclair.c when modified!
*/
#define MAP_ST_START 0xffff800000000000UL
#define MAP_VMAP_START 0xfffff00000000000UL
#define MAP_FIXED_START 0xffffffff70000000UL
#define MAP_KERNEL_START 0xffffffff80000000UL
#define MAP_VMAP_START 0xffff850000000000UL
#define MAP_FIXED_START 0xffff860000000000UL
#define MAP_KERNEL_START 0xffff870000000000UL
#define LINUX_PAGE_OFFSET 0xffff880000000000UL
#define STACK_TOP(region) ((region)->user_end)
#define MAP_VMAP_SIZE 0x0000000100000000UL