^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * fixmap.h: compile-time virtual memory allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 1998 Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright 2008 Freescale Semiconductor Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Port to powerpc added by Kumar Gala
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #ifndef _ASM_FIXMAP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define _ASM_FIXMAP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/threads.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/kmap_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define FIXADDR_TOP (IOREMAP_END + FIXADDR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define FIXADDR_SIZE 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifdef CONFIG_KASAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Here we define all the compile-time 'special' virtual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * addresses. The point is to have a constant address at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * compile time, but to set the physical address only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * in the boot process. We allocate these special addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * from the end of virtual memory (0xfffff000) backwards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Also this lets us do fail-safe vmalloc(), we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * can guarantee that these special addresses and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * vmalloc()-ed addresses never overlap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * these 'compile-time allocated' memory buffers are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * fixed-size 4k pages. (or larger if used with an increment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * highger than 1) use fixmap_set(idx,phys) to associate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * physical memory with fixmap indices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * TLB entries of such buffers will not be flushed across
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * task switches.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) enum fixed_addresses {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) FIX_HOLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #ifdef CONFIG_PPC32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* reserve the top 128K for early debugging purposes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) FIX_EARLY_DEBUG_TOP = FIX_HOLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #ifdef CONFIG_PPC_8xx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* For IMMR we need an aligned 512K area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) FIX_IMMR_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) FIX_IMMR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #ifdef CONFIG_PPC_83xx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* For IMMR we need an aligned 2M area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) FIX_IMMR_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) FIX_IMMR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* FIX_PCIE_MCFG, */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif /* CONFIG_PPC32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __end_of_permanent_fixed_addresses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #define FIX_BTMAPS_SLOTS 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) __end_of_fixed_addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define FIXMAP_PAGE_IO PAGE_KERNEL_NCG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #include <asm-generic/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static inline void __set_fixmap(enum fixed_addresses idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) phys_addr_t phys, pgprot_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (__builtin_constant_p(idx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) else if (WARN_ON(idx >= __end_of_fixed_addresses))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (pgprot_val(flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) map_kernel_page(__fix_to_virt(idx), phys, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) unmap_kernel_page(__fix_to_virt(idx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define __early_set_fixmap __set_fixmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif /* !__ASSEMBLY__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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