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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/include/asm/fixmap.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/include/asm/fixmap.h')
-rw-r--r--arch/arm/include/asm/fixmap.h66
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 000000000..707068f85
--- /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