[mirror_ubuntu-jammy-kernel.git] / arch / hexagon / include / asm / mem-layout.h

/* 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 */
Commit	Line	Data
08dbd0f8	1	/* SPDX-License-Identifier: GPL-2.0-only */
499236d9 RK	2	/*
	3	* Memory layout definitions for the Hexagon architecture
	4	*
7c6a5df4	5	* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
499236d9 RK	6	*/
	7
	8	#ifndef _ASM_HEXAGON_MEM_LAYOUT_H
	9	#define _ASM_HEXAGON_MEM_LAYOUT_H
	10
	11	#include <linux/const.h>
	12
	13	/*
	14	* Have to do this for ginormous numbers, else they get printed as
	15	* negative numbers, which the linker no likey when you try to
	16	* assign it to the location counter.
	17	*/
	18
	19	#define PAGE_OFFSET _AC(0xc0000000, UL)
	20
	21	/*
8f5a0b9d RK	22	* Compiling for a platform that needs a crazy physical offset
	23	* (like if the memory starts at 1GB and up) means we need
	24	* an actual PHYS_OFFSET. Should be set up in head.S.
499236d9 RK	25	*/
499236d9 RK	26
8f5a0b9d RK	27	#ifdef CONFIG_HEXAGON_PHYS_OFFSET
	28	#ifndef __ASSEMBLY__
	29	extern unsigned long __phys_offset;
	30	#endif
	31	#define PHYS_OFFSET __phys_offset
	32	#endif
	33
	34	#ifndef PHYS_OFFSET
	35	#define PHYS_OFFSET 0
499236d9 RK	36	#endif
499236d9 RK	37
8f5a0b9d RK	38	#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
	39	#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
	40
499236d9 RK	41	#define TASK_SIZE (PAGE_OFFSET)
	42
	43	/* not sure how these are used yet */
	44	#define STACK_TOP TASK_SIZE
	45	#define STACK_TOP_MAX TASK_SIZE
	46
	47	#ifndef __ASSEMBLY__
	48	enum fixed_addresses {
	49	FIX_KMAP_BEGIN,
	50	FIX_KMAP_END, /* check for per-cpuism */
	51	__end_of_fixed_addresses
	52	};
	53
e470d932	54	#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */
499236d9 RK	55	extern int max_kernel_seg;
	56
	57	/*
	58	* Start of vmalloc virtual address space for kernel;
	59	* supposed to be based on the amount of physical memory available
	60	*/
	61
5c883b46	62	#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET))
499236d9 RK	63
	64	/* Gap between physical ram and vmalloc space for guard purposes. */
	65	#define VMALLOC_OFFSET PAGE_SIZE
	66
	67	/*
	68	* Create the space between VMALLOC_START and FIXADDR_TOP backwards
	69	* from the ... "top".
	70	*
	71	* Permanent IO mappings will live at 0xfexx_xxxx
	72	* Hypervisor occupies the last 16MB page at 0xffxxxxxx
	73	*/
	74
	75	#define FIXADDR_TOP 0xfe000000
	76	#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
	77	#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
	78
	79	/*
	80	* "permanent kernel mappings", defined as long-lasting mappings of
	81	* high-memory page frames into the kernel address space.
	82	*/
	83
	84	#define LAST_PKMAP PTRS_PER_PTE
	85	#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
	86	#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
	87	#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
	88
	89	/*
	90	* To the "left" of the fixed map space is the kmap space
	91	*
	92	* "Permanent Kernel Mappings"; fancy (or less fancy) PTE table
	93	* that looks like it's actually walked.
	94	* Need to check the alignment/shift usage; some archs use
	95	* PMD_MASK on this value
	96	*/
	97	#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP)
	98
	99	/*
	100	* 2 pages of guard gap between where vmalloc area ends
	101	* and pkmap_base begins.
	102	*/
	103	#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2)
	104	#endif /* !__ASSEMBLY__ */
	105
	106
	107	#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */