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441692aafc
Pull ARM updates from Russell King: - add support for ELF fdpic binaries on both MMU and noMMU platforms - linker script cleanups - support for compressed .data section for XIP images - discard memblock arrays when possible - various cleanups - atomic DMA pool updates - better diagnostics of missing/corrupt device tree - export information to allow userspace kexec tool to place images more inteligently, so that the device tree isn't overwritten by the booting kernel - make early_printk more efficient on semihosted systems - noMMU cleanups - SA1111 PCMCIA update in preparation for further cleanups * 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (38 commits) ARM: 8719/1: NOMMU: work around maybe-uninitialized warning ARM: 8717/2: debug printch/printascii: translate '\n' to "\r\n" not "\n\r" ARM: 8713/1: NOMMU: Support MPU in XIP configuration ARM: 8712/1: NOMMU: Use more MPU regions to cover memory ARM: 8711/1: V7M: Add support for MPU to M-class ARM: 8710/1: Kconfig: Kill CONFIG_VECTORS_BASE ARM: 8709/1: NOMMU: Disallow MPU for XIP ARM: 8708/1: NOMMU: Rework MPU to be mostly done in C ARM: 8707/1: NOMMU: Update MPU accessors to use cp15 helpers ARM: 8706/1: NOMMU: Move out MPU setup in separate module ARM: 8702/1: head-common.S: Clear lr before jumping to start_kernel() ARM: 8705/1: early_printk: use printascii() rather than printch() ARM: 8703/1: debug.S: move hexbuf to a writable section ARM: add additional table to compressed kernel ARM: decompressor: fix BSS size calculation pcmcia: sa1111: remove special sa1111 mmio accessors pcmcia: sa1111: use sa1111_get_irq() to obtain IRQ resources ARM: better diagnostics with missing/corrupt dtb ARM: 8699/1: dma-mapping: Remove init_dma_coherent_pool_size() ARM: 8698/1: dma-mapping: Mark atomic_pool as __ro_after_init ..
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#include <asm/kmap_types.h>
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#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE)
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#define LAST_PKMAP PTRS_PER_PTE
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
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#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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#define kmap_prot PAGE_KERNEL
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#define flush_cache_kmaps() \
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do { \
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if (cache_is_vivt()) \
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flush_cache_all(); \
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} while (0)
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extern pte_t *pkmap_page_table;
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extern void *kmap_high(struct page *page);
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extern void kunmap_high(struct page *page);
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/*
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* The reason for kmap_high_get() is to ensure that the currently kmap'd
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* page usage count does not decrease to zero while we're using its
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* existing virtual mapping in an atomic context. With a VIVT cache this
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* is essential to do, but with a VIPT cache this is only an optimization
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* so not to pay the price of establishing a second mapping if an existing
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* one can be used. However, on platforms without hardware TLB maintenance
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* broadcast, we simply cannot use ARCH_NEEDS_KMAP_HIGH_GET at all since
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* the locking involved must also disable IRQs which is incompatible with
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* the IPI mechanism used by global TLB operations.
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*/
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#define ARCH_NEEDS_KMAP_HIGH_GET
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#if defined(CONFIG_SMP) && defined(CONFIG_CPU_TLB_V6)
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#undef ARCH_NEEDS_KMAP_HIGH_GET
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#if defined(CONFIG_HIGHMEM) && defined(CONFIG_CPU_CACHE_VIVT)
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#error "The sum of features in your kernel config cannot be supported together"
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#endif
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#endif
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/*
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* Needed to be able to broadcast the TLB invalidation for kmap.
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*/
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#ifdef CONFIG_ARM_ERRATA_798181
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#undef ARCH_NEEDS_KMAP_HIGH_GET
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#endif
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#ifdef ARCH_NEEDS_KMAP_HIGH_GET
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extern void *kmap_high_get(struct page *page);
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#else
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static inline void *kmap_high_get(struct page *page)
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{
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return NULL;
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}
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#endif
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/*
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* The following functions are already defined by <linux/highmem.h>
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* when CONFIG_HIGHMEM is not set.
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*/
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#ifdef CONFIG_HIGHMEM
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extern void *kmap(struct page *page);
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extern void kunmap(struct page *page);
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extern void *kmap_atomic(struct page *page);
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extern void __kunmap_atomic(void *kvaddr);
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extern void *kmap_atomic_pfn(unsigned long pfn);
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#endif
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#endif
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