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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-12-05 17:30:54 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-12-05 17:30:54 +0100 |
| commit | e9f2d6d66037cdf97487491e04053f411abc5d16 (patch) | |
| tree | 123cec080d17fb74a2531d8cc7ad1cf44bbad9ec /arch/arm/mm/mmu.c | |
| parent | Merge branches 'fixes', 'misc', 'pm' and 'sa1100' into for-next (diff) | |
| parent | Merge tag 'ronx-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/l... (diff) | |
| download | linux-e9f2d6d66037cdf97487491e04053f411abc5d16.tar.xz linux-e9f2d6d66037cdf97487491e04053f411abc5d16.zip | |
Merge branch 'devel-stable' into for-next
Diffstat (limited to 'arch/arm/mm/mmu.c')
| -rw-r--r-- | arch/arm/mm/mmu.c | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index f86ce1a9f525..cda7c40999b6 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -22,6 +22,7 @@ #include <asm/cputype.h> #include <asm/sections.h> #include <asm/cachetype.h> +#include <asm/fixmap.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/smp_plat.h> @@ -357,6 +358,29 @@ const struct mem_type *get_mem_type(unsigned int type) EXPORT_SYMBOL(get_mem_type); /* + * To avoid TLB flush broadcasts, this uses local_flush_tlb_kernel_range(). + * As a result, this can only be called with preemption disabled, as under + * stop_machine(). + */ +void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) +{ + unsigned long vaddr = __fix_to_virt(idx); + pte_t *pte = pte_offset_kernel(pmd_off_k(vaddr), vaddr); + + /* Make sure fixmap region does not exceed available allocation. */ + BUILD_BUG_ON(FIXADDR_START + (__end_of_fixed_addresses * PAGE_SIZE) > + FIXADDR_END); + BUG_ON(idx >= __end_of_fixed_addresses); + + if (pgprot_val(prot)) + set_pte_at(NULL, vaddr, pte, + pfn_pte(phys >> PAGE_SHIFT, prot)); + else + pte_clear(NULL, vaddr, pte); + local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); +} + +/* * Adjust the PMD section entries according to the CPU in use. */ static void __init build_mem_type_table(void) @@ -1296,10 +1320,10 @@ static void __init kmap_init(void) #ifdef CONFIG_HIGHMEM pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE), PKMAP_BASE, _PAGE_KERNEL_TABLE); - - fixmap_page_table = early_pte_alloc(pmd_off_k(FIXADDR_START), - FIXADDR_START, _PAGE_KERNEL_TABLE); #endif + + early_pte_alloc(pmd_off_k(FIXADDR_START), FIXADDR_START, + _PAGE_KERNEL_TABLE); } static void __init map_lowmem(void) @@ -1319,13 +1343,20 @@ static void __init map_lowmem(void) if (start >= end) break; - if (end < kernel_x_start || start >= kernel_x_end) { + if (end < kernel_x_start) { map.pfn = __phys_to_pfn(start); map.virtual = __phys_to_virt(start); map.length = end - start; map.type = MT_MEMORY_RWX; create_mapping(&map); + } else if (start >= kernel_x_end) { + map.pfn = __phys_to_pfn(start); + map.virtual = __phys_to_virt(start); + map.length = end - start; + map.type = MT_MEMORY_RW; + + create_mapping(&map); } else { /* This better cover the entire kernel */ if (start < kernel_x_start) { |