/*
* 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/math.h>
#include <linux/sizes.h>
#include <asm/boot.h>
#include <asm/page.h>
#include <asm/pgtable-prot.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.
*
* Each enum increment in these 'compile-time allocated'
* memory buffers is page-sized. Use set_fixmap(idx,phys)
* to associate physical memory with a fixmap index.
*/
enum fixed_addresses {
FIX_HOLE,
/*
* Reserve a virtual window for the FDT that is a page bigger than the
* maximum supported size. The additional space ensures that any FDT
* that does not exceed MAX_FDT_SIZE can be mapped regardless of
* whether it crosses any page boundary.
*/
FIX_FDT_END,
FIX_FDT = FIX_FDT_END + DIV_ROUND_UP(MAX_FDT_SIZE, PAGE_SIZE) + 1,
FIX_EARLYCON_MEM_BASE,
FIX_TEXT_POKE0,
#ifdef CONFIG_ACPI_APEI_GHES
/* Used for GHES mapping from assorted contexts */
FIX_APEI_GHES_IRQ,
FIX_APEI_GHES_SEA,
#ifdef CONFIG_ARM_SDE_INTERFACE
FIX_APEI_GHES_SDEI_NORMAL,
FIX_APEI_GHES_SDEI_CRITICAL,
#endif
#endif /* CONFIG_ACPI_APEI_GHES */
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
#ifdef CONFIG_RELOCATABLE
FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */
#endif
FIX_ENTRY_TRAMP_TEXT3,
FIX_ENTRY_TRAMP_TEXT2,
FIX_ENTRY_TRAMP_TEXT1,
#define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
#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 FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
void __init early_fixmap_init(void);
void __init fixmap_copy(pgd_t *pgdir);
#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 */
