| 1 |
|
| 2 | |
| 3 | * Copyright (C) 2019 Western Digital Corporation or its affiliates.
|
| 4 |
|
| 5 |
|
| 6 | #ifndef _ASM_RISCV_FIXMAP_H
|
| 7 | #define _ASM_RISCV_FIXMAP_H
|
| 8 |
|
| 9 | #include <linux/kernel.h>
|
| 10 | #include <linux/sizes.h>
|
| 11 | #include <linux/pgtable.h>
|
| 12 | #include <asm/page.h>
|
| 13 |
|
| 14 | #ifdef CONFIG_MMU
|
| 15 | |
| 16 | * Here we define all the compile-time 'special' virtual addresses.
|
| 17 | * The point is to have a constant address at compile time, but to
|
| 18 | * set the physical address only in the boot process.
|
| 19 | *
|
| 20 | * These 'compile-time allocated' memory buffers are page-sized. Use
|
| 21 | * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
|
| 22 |
|
| 23 | enum fixed_addresses {
|
| 24 | FIX_HOLE,
|
| 25 | |
| 26 | * The fdt fixmap mapping must be PMD aligned and will be mapped
|
| 27 | * using PMD entries in fixmap_pmd in 64-bit and a PGD entry in 32-bit.
|
| 28 |
|
| 29 | FIX_FDT_END,
|
| 30 | FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
|
| 31 |
|
| 32 |
|
| 33 | FIX_PTE,
|
| 34 | FIX_PMD,
|
| 35 | FIX_PUD,
|
| 36 | FIX_P4D,
|
| 37 | FIX_TEXT_POKE1,
|
| 38 | FIX_TEXT_POKE0,
|
| 39 | FIX_EARLYCON_MEM_BASE,
|
| 40 |
|
| 41 | __end_of_permanent_fixed_addresses,
|
| 42 | |
| 43 | * Temporary boot-time mappings, used by early_ioremap(),
|
| 44 | * before ioremap() is functional.
|
| 45 |
|
| 46 | #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
|
| 47 | #define FIX_BTMAPS_SLOTS 7
|
| 48 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
|
| 49 |
|
| 50 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
|
| 51 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
|
| 52 |
|
| 53 | __end_of_fixed_addresses
|
| 54 | };
|
| 55 |
|
| 56 | #define __early_set_fixmap __set_fixmap
|
| 57 |
|
| 58 | extern void __set_fixmap(enum fixed_addresses idx,
|
| 59 | phys_addr_t phys, pgprot_t prot);
|
| 60 |
|
| 61 | #include <asm-generic/fixmap.h>
|
| 62 |
|
| 63 | #endif
|
| 64 | #endif
|