1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_FIXMAP_H
3 #define _ASM_FIXMAP_H
4
5 /*
6 * This file defines the locations of the fixed mappings on parisc.
7 *
8 * All of the values in this file are machine virtual addresses.
9 *
10 * All of the values in this file must be <4GB (because of assembly
11 * loading restrictions). If you place this region anywhere above
12 * __PAGE_OFFSET, you must adjust the memory map accordingly */
13
14 /* The alias region is used in kernel space to do copy/clear to or
15 * from areas congruently mapped with user space. It is 8MB large
16 * and must be 16MB aligned */
17 #define TMPALIAS_MAP_START ((__PAGE_OFFSET) - 16*1024*1024)
18
19 #define FIXMAP_SIZE (FIX_BITMAP_COUNT << PAGE_SHIFT)
20 #define FIXMAP_START (TMPALIAS_MAP_START - FIXMAP_SIZE)
21 /* This is the kernel area for all maps (vmalloc, dma etc.) most
22 * usually, it extends up to TMPALIAS_MAP_START. Virtual addresses
23 * 0..GATEWAY_PAGE_SIZE are reserved for the gateway page */
24 #define KERNEL_MAP_START (GATEWAY_PAGE_SIZE)
25 #define KERNEL_MAP_END (FIXMAP_START)
26
27 #ifndef __ASSEMBLY__
28
29
30 enum fixed_addresses {
31 /* Support writing RO kernel text via kprobes, jump labels, etc. */
32 FIX_TEXT_POKE0,
33 FIX_TEXT_KEXEC,
34 FIX_BITMAP_COUNT
35 };
36
37 extern void *parisc_vmalloc_start;
38 #define PCXL_DMA_MAP_SIZE (8*1024*1024)
39 #define VMALLOC_START ((unsigned long)parisc_vmalloc_start)
40 #define VMALLOC_END (KERNEL_MAP_END)
41
42 #define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
43
44 void set_fixmap(enum fixed_addresses idx, phys_addr_t phys);
45 void clear_fixmap(enum fixed_addresses idx);
46
47 #endif /*__ASSEMBLY__*/
48
49 #endif /*_ASM_FIXMAP_H*/