Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Michal Simek monstr@monstr.eu --- Note: Completely untested --- arch/microblaze/Kconfig | 1 arch/microblaze/include/asm/highmem.h | 6 ++ arch/microblaze/mm/Makefile | 1 arch/microblaze/mm/highmem.c | 78 ---------------------------------- arch/microblaze/mm/init.c | 6 -- 5 files changed, 6 insertions(+), 86 deletions(-)
--- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -170,6 +170,7 @@ config XILINX_UNCACHED_SHADOW config HIGHMEM bool "High memory support" depends on MMU + select KMAP_ATOMIC_GENERIC help The address space of Microblaze processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address --- a/arch/microblaze/include/asm/highmem.h +++ b/arch/microblaze/include/asm/highmem.h @@ -25,7 +25,6 @@ #include <linux/uaccess.h> #include <asm/fixmap.h>
-extern pte_t *kmap_pte; extern pte_t *pkmap_page_table;
/* @@ -52,6 +51,11 @@ extern pte_t *pkmap_page_table;
#define flush_cache_kmaps() { flush_icache(); flush_dcache(); }
+#define arch_kmap_temp_post_map(vaddr, pteval) \ + local_flush_tlb_page(NULL, vaddr); +#define arch_kmap_temp_post_unmap(vaddr) \ + local_flush_tlb_page(NULL, vaddr); + #endif /* __KERNEL__ */
#endif /* _ASM_HIGHMEM_H */ --- a/arch/microblaze/mm/Makefile +++ b/arch/microblaze/mm/Makefile @@ -6,4 +6,3 @@ obj-y := consistent.o init.o
obj-$(CONFIG_MMU) += pgtable.o mmu_context.o fault.o -obj-$(CONFIG_HIGHMEM) += highmem.o --- a/arch/microblaze/mm/highmem.c +++ /dev/null @@ -1,78 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * highmem.c: virtual kernel memory mappings for high memory - * - * PowerPC version, stolen from the i386 version. - * - * Used in CONFIG_HIGHMEM systems for memory pages which - * are not addressable by direct kernel virtual addresses. - * - * Copyright (C) 1999 Gerhard Wichert, Siemens AG - * Gerhard.Wichert@pdb.siemens.de - * - * - * Redesigned the x86 32-bit VM architecture to deal with - * up to 16 Terrabyte physical memory. With current x86 CPUs - * we now support up to 64 Gigabytes physical RAM. - * - * Copyright (C) 1999 Ingo Molnar mingo@redhat.com - * - * Reworked for PowerPC by various contributors. Moved from - * highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp. - */ - -#include <linux/export.h> -#include <linux/highmem.h> - -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need - * it. - */ -#include <asm/tlbflush.h> - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - - unsigned long vaddr; - int idx, type; - - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte-idx))); -#endif - set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot)); - local_flush_tlb_page(NULL, vaddr); - - return (void *) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int type; - unsigned int idx; - - if (vaddr < __fix_to_virt(FIX_KMAP_END)) - return; - - type = kmap_atomic_idx(); - - idx = type + KM_TYPE_NR * smp_processor_id(); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); -#endif - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - local_flush_tlb_page(NULL, vaddr); - - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); --- a/arch/microblaze/mm/init.c +++ b/arch/microblaze/mm/init.c @@ -49,17 +49,11 @@ unsigned long lowmem_size; EXPORT_SYMBOL(min_low_pfn); EXPORT_SYMBOL(max_low_pfn);
-#ifdef CONFIG_HIGHMEM -pte_t *kmap_pte; -EXPORT_SYMBOL(kmap_pte); - static void __init highmem_init(void) { pr_debug("%x\n", (u32)PKMAP_BASE); map_page(PKMAP_BASE, 0, 0); /* XXX gross */ pkmap_page_table = virt_to_kpte(PKMAP_BASE); - - kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); }
static void highmem_setup(void)