diff options
Diffstat (limited to 'arch/arm/include/asm/fixmap.h')
-rw-r--r-- | arch/arm/include/asm/fixmap.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h new file mode 100644 index 0000000000..707068f852 --- /dev/null +++ b/arch/arm/include/asm/fixmap.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_FIXMAP_H +#define _ASM_FIXMAP_H + +#define FIXADDR_START 0xffc80000UL +#define FIXADDR_END 0xfff00000UL +#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE) + +#include <linux/pgtable.h> +#include <asm/kmap_size.h> + +enum fixed_addresses { + FIX_EARLYCON_MEM_BASE, + __end_of_permanent_fixed_addresses, + + FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses, + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, + + /* Support writing RO kernel text via kprobes, jump labels, etc. */ + FIX_TEXT_POKE0, + FIX_TEXT_POKE1, + + __end_of_fixmap_region, + + /* + * Share the kmap() region with early_ioremap(): this is guaranteed + * not to clash since early_ioremap() is only available before + * paging_init(), and kmap() only after. + */ +#define NR_FIX_BTMAPS 32 +#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, + __end_of_early_ioremap_region +}; + +static const enum fixed_addresses __end_of_fixed_addresses = + __end_of_fixmap_region > __end_of_early_ioremap_region ? + __end_of_fixmap_region : __end_of_early_ioremap_region; + +#define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY) + +#define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN) +#define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY) + +/* Used by set_fixmap_(io|nocache), both meant for mapping a device */ +#define FIXMAP_PAGE_IO (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED) +#define FIXMAP_PAGE_NOCACHE FIXMAP_PAGE_IO + +#define __early_set_fixmap __set_fixmap + +#ifdef CONFIG_MMU + +void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); +void __init early_fixmap_init(void); + +#include <asm-generic/fixmap.h> + +#else + +static inline void early_fixmap_init(void) { } + +#endif +#endif |