lib/ioremap.c: add huge I/O map capability interfaces

[cascardo/linux.git] / lib / ioremap.c

diff --git a/lib/ioremap.c b/lib/ioremap.c
index 0c9216c..2008652 100644 (file)
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -13,6 +13,43 @@
 #include <asm/cacheflush.h>
 #include <asm/pgtable.h>
 
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+int __read_mostly ioremap_pud_capable;
+int __read_mostly ioremap_pmd_capable;
+int __read_mostly ioremap_huge_disabled;
+
+static int __init set_nohugeiomap(char *str)
+{
+       ioremap_huge_disabled = 1;
+       return 0;
+}
+early_param("nohugeiomap", set_nohugeiomap);
+
+void __init ioremap_huge_init(void)
+{
+       if (!ioremap_huge_disabled) {
+               if (arch_ioremap_pud_supported())
+                       ioremap_pud_capable = 1;
+               if (arch_ioremap_pmd_supported())
+                       ioremap_pmd_capable = 1;
+       }
+}
+
+static inline int ioremap_pud_enabled(void)
+{
+       return ioremap_pud_capable;
+}
+
+static inline int ioremap_pmd_enabled(void)
+{
+       return ioremap_pmd_capable;
+}
+
+#else  /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
+static inline int ioremap_pud_enabled(void) { return 0; }
+static inline int ioremap_pmd_enabled(void) { return 0; }
+#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
+
 static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
                unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
 {