^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * fixmap.h: compile-time virtual memory allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1998 Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #ifndef _ASM_FIXMAP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define _ASM_FIXMAP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/threads.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/kmap_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Here we define all the compile-time 'special' virtual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * addresses. The point is to have a constant address at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * compile time, but to set the physical address only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * in the boot process. We allocate these special addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * from the end of P3 backwards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Also this lets us do fail-safe vmalloc(), we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * can guarantee that these special addresses and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * vmalloc()-ed addresses never overlap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * these 'compile-time allocated' memory buffers are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * fixed-size 4k pages. (or larger if used with an increment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * highger than 1) use fixmap_set(idx,phys) to associate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * physical memory with fixmap indices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * TLB entries of such buffers will not be flushed across
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * task switches.
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * on UP currently we will have no trace of the fixmap mechanizm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * no page table allocations, etc. This might change in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * future, say framebuffers for the console driver(s) could be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * fix-mapped?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) enum fixed_addresses {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * The FIX_CMAP entries are used by kmap_coherent() to get virtual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * addresses which are of a known color, and so their values are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * important. __fix_to_virt(FIX_CMAP_END - n) must give an address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * which is the same color as a page (n<<PAGE_SHIFT).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define FIX_N_COLOURS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) FIX_CMAP_BEGIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS) - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #ifdef CONFIG_IOREMAP_FIXED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * FIX_IOREMAP entries are useful for mapping physical address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * space before ioremap() is useable, e.g. really early in boot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * before kmalloc() is working.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define FIX_N_IOREMAPS 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) FIX_IOREMAP_BEGIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) __end_of_fixed_addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) extern void __set_fixmap(enum fixed_addresses idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) unsigned long phys, pgprot_t flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) extern void __clear_fixmap(enum fixed_addresses idx, pgprot_t flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * used by vmalloc.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * Leave one empty page between vmalloc'ed areas and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * the start of the fixmap, and leave one page empty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * at the top of mem..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #define FIXADDR_TOP (P4SEG - PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #include <asm-generic/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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