summaryrefslogtreecommitdiffstats
path: root/arch/sh/mm/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/mm/init.c')
-rw-r--r--arch/sh/mm/init.c74
1 files changed, 60 insertions, 14 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index b75a7ac..2a53943 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -23,7 +23,19 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
-unsigned long cached_to_uncached = 0;
+
+#ifdef CONFIG_SUPERH32
+/*
+ * Handle trivial transitions between cached and uncached
+ * segments, making use of the 1:1 mapping relationship in
+ * 512MB lowmem.
+ *
+ * This is the offset of the uncached section from its cached alias.
+ * Default value only valid in 29 bit mode, in 32bit mode will be
+ * overridden in pmb_init.
+ */
+unsigned long cached_to_uncached = P2SEG - P1SEG;
+#endif
#ifdef CONFIG_MMU
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
@@ -58,9 +70,7 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
}
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
-
- if (cached_to_uncached)
- flush_tlb_one(get_asid(), addr);
+ flush_tlb_one(get_asid(), addr);
}
/*
@@ -113,7 +123,6 @@ void __init page_table_range_init(unsigned long start, unsigned long end,
if (!pmd_present(*pmd)) {
pte_t *pte_table;
pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
- memset(pte_table, 0, PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte_table);
}
@@ -165,15 +174,6 @@ void __init paging_init(void)
#ifdef CONFIG_SUPERH32
/* Set up the uncached fixmap */
set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
-
-#ifdef CONFIG_29BIT
- /*
- * Handle trivial transitions between cached and uncached
- * segments, making use of the 1:1 mapping relationship in
- * 512MB lowmem.
- */
- cached_to_uncached = P2SEG - P1SEG;
-#endif
#endif
}
@@ -265,6 +265,35 @@ void free_initrd_mem(unsigned long start, unsigned long end)
}
#endif
+#if THREAD_SHIFT < PAGE_SHIFT
+static struct kmem_cache *thread_info_cache;
+
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+ struct thread_info *ti;
+
+ ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
+ if (unlikely(ti == NULL))
+ return NULL;
+#ifdef CONFIG_DEBUG_STACK_USAGE
+ memset(ti, 0, THREAD_SIZE);
+#endif
+ return ti;
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+ kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+ thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+ THREAD_SIZE, 0, NULL);
+ BUG_ON(thread_info_cache == NULL);
+}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
+
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
@@ -292,4 +321,21 @@ int memory_add_physaddr_to_nid(u64 addr)
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT);
+ int ret;
+
+ ret = offline_pages(start_pfn, end_pfn, 120 * HZ);
+ if (unlikely(ret))
+ printk("%s: Failed, offline_pages() == %d\n", __func__, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
#endif
+
+#endif /* CONFIG_MEMORY_HOTPLUG */
OpenPOWER on IntegriCloud