diff options
Diffstat (limited to 'kernel/arch/arm64/include/asm/fixmap.h')
| -rw-r--r-- | kernel/arch/arm64/include/asm/fixmap.h | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/kernel/arch/arm64/include/asm/fixmap.h b/kernel/arch/arm64/include/asm/fixmap.h index 95e6b6dcb..309704544 100644 --- a/kernel/arch/arm64/include/asm/fixmap.h +++ b/kernel/arch/arm64/include/asm/fixmap.h @@ -8,7 +8,7 @@ * Copyright (C) 1998 Ingo Molnar * Copyright (C) 2013 Mark Salter <msalter@redhat.com> * - * Adapted from arch/x86_64 version. + * Adapted from arch/x86 version. * */ @@ -17,6 +17,8 @@ #ifndef __ASSEMBLY__ #include <linux/kernel.h> +#include <linux/sizes.h> +#include <asm/boot.h> #include <asm/page.h> /* @@ -32,6 +34,20 @@ */ 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. + */ +#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, __end_of_permanent_fixed_addresses, @@ -40,11 +56,7 @@ enum fixed_addresses { * Temporary boot-time mappings, used by early_ioremap(), * before ioremap() is functional. */ -#ifdef CONFIG_ARM64_64K_PAGES -#define NR_FIX_BTMAPS 4 -#else -#define NR_FIX_BTMAPS 64 -#endif +#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) #define FIX_BTMAPS_SLOTS 7 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |