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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm64/include/asm/fixmap.h
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm64/include/asm/fixmap.h')
-rw-r--r--arch/arm64/include/asm/fixmap.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
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+/*
+ * 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 */