From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 11 Jul 2005 20:45:51 +0000 (+0000)
Subject: Define kmap_atomic_pfn() for MIPS.
X-Git-Tag: v2.6.15-rc1~731^2~1^2~152
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60080265a13ea43f0ebdcd25671dcab05ed01308;p=linux-2.6

Define kmap_atomic_pfn() for MIPS.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index dd5e2e3188..1f7b37b38f 100644
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -83,6 +83,25 @@ void __kunmap_atomic(void *kvaddr, enum km_type type)
 	preempt_check_resched();
 }
 
+/*
+ * This is the same as kmap_atomic() but can map memory that doesn't
+ * have a struct page associated with it.
+ */
+void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
+{
+	enum fixed_addresses idx;
+	unsigned long vaddr;
+
+	inc_preempt_count();
+
+	idx = type + KM_TYPE_NR*smp_processor_id();
+	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+	set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot));
+	flush_tlb_one(vaddr);
+
+	return (void*) vaddr;
+}
+
 struct page *__kmap_atomic_to_page(void *ptr)
 {
 	unsigned long idx, vaddr = (unsigned long)ptr;
diff --git a/include/asm-mips/highmem.h b/include/asm-mips/highmem.h
index f49930d947..8cf5984024 100644
--- a/include/asm-mips/highmem.h
+++ b/include/asm-mips/highmem.h
@@ -75,6 +75,7 @@ static inline void *kmap_atomic(struct page *page, enum km_type type)
 }
 
 static inline void kunmap_atomic(void *kvaddr, enum km_type type) { }
+#define kmap_atomic_pfn(pfn, idx)	page_address(pfn_to_page(pfn))
 
 #define kmap_atomic_to_page(ptr) virt_to_page(ptr)
 
@@ -86,6 +87,7 @@ extern void *__kmap(struct page *page);
 extern void __kunmap(struct page *page);
 extern void *__kmap_atomic(struct page *page, enum km_type type);
 extern void __kunmap_atomic(void *kvaddr, enum km_type type);
+extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
 extern struct page *__kmap_atomic_to_page(void *ptr);
 
 #define kmap			__kmap