| /* |
| * fixmap.h: compile-time virtual memory allocation |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1998 Ingo Molnar |
| * Copyright (C) 2013 Mark Salter <msalter@redhat.com> |
| * |
| * Adapted from arch/x86 version. |
| * |
| */ |
| |
| #ifndef _ASM_ARM64_FIXMAP_H |
| #define _ASM_ARM64_FIXMAP_H |
| |
| #ifndef __ASSEMBLY__ |
| #include <linux/kernel.h> |
| #include <linux/sizes.h> |
| #include <asm/boot.h> |
| #include <asm/page.h> |
| |
| /* |
| * Here we define all the compile-time 'special' virtual |
| * addresses. The point is to have a constant address at |
| * compile time, but to set the physical address only |
| * in the boot process. |
| * |
| * These 'compile-time allocated' memory buffers are |
| * page-sized. Use set_fixmap(idx,phys) to associate |
| * physical memory with fixmap indices. |
| * |
| */ |
| enum fixed_addresses { |
| FIX_HOLE, |
| |
| /* |
| * Reserve a virtual window for the FDT that is 2 MB larger than the |
| * maximum supported size, and put it at the top of the fixmap region. |
| * The additional space ensures that any FDT that does not exceed |
| * MAX_FDT_SIZE can be mapped regardless of whether it crosses any |
| * 2 MB alignment boundaries. |
| * |
| * Keep this at the top so it remains 2 MB aligned. |
| */ |
| #ifdef CONFIG_UH |
| FIX_UH_END, |
| FIX_UH = FIX_UH_END + SZ_2M / PAGE_SIZE - 1, |
| #endif |
| #define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M) |
| FIX_FDT_END, |
| FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, |
| |
| FIX_EARLYCON_MEM_BASE, |
| FIX_TEXT_POKE0, |
| #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 |
| FIX_ENTRY_TRAMP_DATA, |
| FIX_ENTRY_TRAMP_TEXT, |
| #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT)) |
| #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ |
| __end_of_permanent_fixed_addresses, |
| |
| /* |
| * Temporary boot-time mappings, used by early_ioremap(), |
| * before ioremap() is functional. |
| */ |
| #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) |
| #define FIX_BTMAPS_SLOTS 7 |
| #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
| |
| FIX_BTMAP_END = __end_of_permanent_fixed_addresses, |
| FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
| |
| /* |
| * Used for kernel page table creation, so unmapped memory may be used |
| * for tables. |
| */ |
| FIX_PTE, |
| FIX_PMD, |
| FIX_PUD, |
| FIX_PGD, |
| |
| __end_of_fixed_addresses |
| }; |
| |
| #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
| #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
| |
| #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) |
| |
| void __init early_fixmap_init(void); |
| |
| #define __early_set_fixmap __set_fixmap |
| |
| #define __late_set_fixmap __set_fixmap |
| #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) |
| |
| extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); |
| |
| #include <asm-generic/fixmap.h> |
| |
| #endif /* !__ASSEMBLY__ */ |
| #endif /* _ASM_ARM64_FIXMAP_H */ |