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1/*
2 * Memory layout definitions for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_HEXAGON_MEM_LAYOUT_H
22#define _ASM_HEXAGON_MEM_LAYOUT_H
23
24#include <linux/const.h>
25
26/*
27 * Have to do this for ginormous numbers, else they get printed as
28 * negative numbers, which the linker no likey when you try to
29 * assign it to the location counter.
30 */
31
32#define PAGE_OFFSET _AC(0xc0000000, UL)
33
34/*
35 * Compiling for a platform that needs a crazy physical offset
36 * (like if the memory starts at 1GB and up) means we need
37 * an actual PHYS_OFFSET. Should be set up in head.S.
38 */
39
40#ifdef CONFIG_HEXAGON_PHYS_OFFSET
41#ifndef __ASSEMBLY__
42extern unsigned long __phys_offset;
43#endif
44#define PHYS_OFFSET __phys_offset
45#endif
46
47#ifndef PHYS_OFFSET
48#define PHYS_OFFSET 0
49#endif
50
51#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
52#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
53
54#define TASK_SIZE (PAGE_OFFSET)
55
56/* not sure how these are used yet */
57#define STACK_TOP TASK_SIZE
58#define STACK_TOP_MAX TASK_SIZE
59
60#ifndef __ASSEMBLY__
61enum fixed_addresses {
62 FIX_KMAP_BEGIN,
63 FIX_KMAP_END, /* check for per-cpuism */
64 __end_of_fixed_addresses
65};
66
67#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */
68extern int max_kernel_seg;
69
70/*
71 * Start of vmalloc virtual address space for kernel;
72 * supposed to be based on the amount of physical memory available
73 */
74
75#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET))
76
77/* Gap between physical ram and vmalloc space for guard purposes. */
78#define VMALLOC_OFFSET PAGE_SIZE
79
80/*
81 * Create the space between VMALLOC_START and FIXADDR_TOP backwards
82 * from the ... "top".
83 *
84 * Permanent IO mappings will live at 0xfexx_xxxx
85 * Hypervisor occupies the last 16MB page at 0xffxxxxxx
86 */
87
88#define FIXADDR_TOP 0xfe000000
89#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
90#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
91
92/*
93 * "permanent kernel mappings", defined as long-lasting mappings of
94 * high-memory page frames into the kernel address space.
95 */
96
97#define LAST_PKMAP PTRS_PER_PTE
98#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
99#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
100#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
101
102/*
103 * To the "left" of the fixed map space is the kmap space
104 *
105 * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table
106 * that looks like it's actually walked.
107 * Need to check the alignment/shift usage; some archs use
108 * PMD_MASK on this value
109 */
110#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP)
111
112/*
113 * 2 pages of guard gap between where vmalloc area ends
114 * and pkmap_base begins.
115 */
116#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2)
117#endif /* !__ASSEMBLY__ */
118
119
120#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */
1/*
2 * Memory layout definitions for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_HEXAGON_MEM_LAYOUT_H
22#define _ASM_HEXAGON_MEM_LAYOUT_H
23
24#include <linux/const.h>
25
26/*
27 * Have to do this for ginormous numbers, else they get printed as
28 * negative numbers, which the linker no likey when you try to
29 * assign it to the location counter.
30 */
31
32#define PAGE_OFFSET _AC(0xc0000000, UL)
33
34/*
35 * Compiling for a platform that needs a crazy physical offset
36 * (like if the memory starts at 1GB and up) means we need
37 * an actual PHYS_OFFSET. Should be set up in head.S.
38 */
39
40#ifdef CONFIG_HEXAGON_PHYS_OFFSET
41#ifndef __ASSEMBLY__
42extern unsigned long __phys_offset;
43#endif
44#define PHYS_OFFSET __phys_offset
45#endif
46
47#ifndef PHYS_OFFSET
48#define PHYS_OFFSET 0
49#endif
50
51#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
52#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
53
54#define TASK_SIZE (PAGE_OFFSET)
55
56/* not sure how these are used yet */
57#define STACK_TOP TASK_SIZE
58#define STACK_TOP_MAX TASK_SIZE
59
60#ifndef __ASSEMBLY__
61enum fixed_addresses {
62 FIX_KMAP_BEGIN,
63 FIX_KMAP_END, /* check for per-cpuism */
64 __end_of_fixed_addresses
65};
66
67#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */
68extern int max_kernel_seg;
69
70/*
71 * Start of vmalloc virtual address space for kernel;
72 * supposed to be based on the amount of physical memory available
73 */
74
75#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET))
76
77/* Gap between physical ram and vmalloc space for guard purposes. */
78#define VMALLOC_OFFSET PAGE_SIZE
79
80/*
81 * Create the space between VMALLOC_START and FIXADDR_TOP backwards
82 * from the ... "top".
83 *
84 * Permanent IO mappings will live at 0xfexx_xxxx
85 * Hypervisor occupies the last 16MB page at 0xffxxxxxx
86 */
87
88#define FIXADDR_TOP 0xfe000000
89#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
90#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
91
92/*
93 * "permanent kernel mappings", defined as long-lasting mappings of
94 * high-memory page frames into the kernel address space.
95 */
96
97#define LAST_PKMAP PTRS_PER_PTE
98#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
99#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
100#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
101
102/*
103 * To the "left" of the fixed map space is the kmap space
104 *
105 * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table
106 * that looks like it's actually walked.
107 * Need to check the alignment/shift usage; some archs use
108 * PMD_MASK on this value
109 */
110#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP)
111
112/*
113 * 2 pages of guard gap between where vmalloc area ends
114 * and pkmap_base begins.
115 */
116#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2)
117#endif /* !__ASSEMBLY__ */
118
119
120#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */