Viewing file:  mem-layout.h (2.8 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Memory layout definitions for the Hexagon architecture
*
* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
*/
#ifndef _ASM_HEXAGON_MEM_LAYOUT_H
#define _ASM_HEXAGON_MEM_LAYOUT_H
#include <linux/const.h>
/*
* Have to do this for ginormous numbers, else they get printed as
* negative numbers, which the linker no likey when you try to
* assign it to the location counter.
*/
#define PAGE_OFFSET _AC(0xc0000000, UL)
/*
* Compiling for a platform that needs a crazy physical offset
* (like if the memory starts at 1GB and up) means we need
* an actual PHYS_OFFSET. Should be set up in head.S.
*/
#ifdef CONFIG_HEXAGON_PHYS_OFFSET
#ifndef __ASSEMBLY__
extern unsigned long __phys_offset;
#endif
#define PHYS_OFFSET __phys_offset
#endif
#ifndef PHYS_OFFSET
#define PHYS_OFFSET 0
#endif
#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
#define TASK_SIZE (PAGE_OFFSET)
/* not sure how these are used yet */
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE
#ifndef __ASSEMBLY__
enum fixed_addresses {
FIX_KMAP_BEGIN,
FIX_KMAP_END, /* check for per-cpuism */
__end_of_fixed_addresses
};
#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */
extern int max_kernel_seg;
/*
* Start of vmalloc virtual address space for kernel;
* supposed to be based on the amount of physical memory available
*/
#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET))
/* Gap between physical ram and vmalloc space for guard purposes. */
#define VMALLOC_OFFSET PAGE_SIZE
/*
* Create the space between VMALLOC_START and FIXADDR_TOP backwards
* from the ... "top".
*
* Permanent IO mappings will live at 0xfexx_xxxx
* Hypervisor occupies the last 16MB page at 0xffxxxxxx
*/
#define FIXADDR_TOP 0xfe000000
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
/*
* "permanent kernel mappings", defined as long-lasting mappings of
* high-memory page frames into the kernel address space.
*/
#define LAST_PKMAP PTRS_PER_PTE
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
/*
* To the "left" of the fixed map space is the kmap space
*
* "Permanent Kernel Mappings"; fancy (or less fancy) PTE table
* that looks like it's actually walked.
* Need to check the alignment/shift usage; some archs use
* PMD_MASK on this value
*/
#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP)
/*
* 2 pages of guard gap between where vmalloc area ends
* and pkmap_base begins.
*/
#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2)
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */
|