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Subject[RFC PATCH v2 04/11] lib: memory management (kernel glue code)
Date
Signed-off-by: Hajime Tazaki <tazaki@sfc.wide.ad.jp>
---
arch/lib/slab.c | 203 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 203 insertions(+)
create mode 100644 arch/lib/slab.c

diff --git a/arch/lib/slab.c b/arch/lib/slab.c
new file mode 100644
index 0000000..a08f736
--- /dev/null
+++ b/arch/lib/slab.c
@@ -0,0 +1,203 @@
+/*
+ * glue code for library version of Linux kernel
+ * Copyright (c) 2015 INRIA, Hajime Tazaki
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@gmail.com>
+ * Hajime Tazaki <tazaki@sfc.wide.ad.jp>
+ */
+
+#include "sim.h"
+#include "sim-assert.h"
+#include <linux/page-flags.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+/* glues */
+struct kmem_cache *files_cachep;
+
+void kfree(const void *p)
+{
+ unsigned long start;
+
+ if (p == 0)
+ return;
+ start = (unsigned long)p;
+ start -= sizeof(size_t);
+ lib_free((void *)start);
+}
+size_t ksize(const void *p)
+{
+ size_t *psize = (size_t *)p;
+
+ psize--;
+ return *psize;
+}
+void *__kmalloc(size_t size, gfp_t flags)
+{
+ void *p = lib_malloc(size + sizeof(size));
+ unsigned long start;
+
+ if (!p)
+ return NULL;
+
+ if (p != 0 && (flags & __GFP_ZERO))
+ lib_memset(p, 0, size + sizeof(size));
+ lib_memcpy(p, &size, sizeof(size));
+ start = (unsigned long)p;
+ return (void *)(start + sizeof(size));
+}
+
+void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller)
+{
+ return kmalloc(size, flags);
+}
+
+void *krealloc(const void *p, size_t new_size, gfp_t flags)
+{
+ void *ret;
+
+ if (!new_size) {
+ kfree(p);
+ return ZERO_SIZE_PTR;
+ }
+
+ ret = __kmalloc(new_size, flags);
+ if (ret && p != ret)
+ kfree(p);
+
+ return ret;
+}
+
+struct kmem_cache *
+kmem_cache_create(const char *name, size_t size, size_t align,
+ unsigned long flags, void (*ctor)(void *))
+{
+ struct kmem_cache *cache = kmalloc(sizeof(struct kmem_cache), flags);
+
+ if (!cache)
+ return NULL;
+ cache->name = name;
+ cache->size = size;
+ cache->align = align;
+ cache->flags = flags;
+ cache->ctor = ctor;
+ return cache;
+}
+void kmem_cache_destroy(struct kmem_cache *cache)
+{
+ kfree(cache);
+}
+int kmem_cache_shrink(struct kmem_cache *cache)
+{
+ return 1;
+}
+const char *kmem_cache_name(struct kmem_cache *cache)
+{
+ return cache->name;
+}
+void *kmem_cache_alloc(struct kmem_cache *cache, gfp_t flags)
+{
+ void *p = kmalloc(cache->size, flags);
+
+ if (p == 0)
+ return NULL;
+ if (cache->ctor)
+ (cache->ctor)(p);
+ return p;
+
+}
+void kmem_cache_free(struct kmem_cache *cache, void *p)
+{
+ kfree(p);
+}
+
+struct page *
+__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
+ struct zonelist *zonelist, nodemask_t *nodemask)
+{
+ void *p;
+ struct page *page;
+ unsigned long pointer;
+
+ /* typically, called from networking code by alloc_page or */
+ /* directly with an order = 0. */
+ if (order)
+ return NULL;
+ p = lib_malloc(sizeof(struct page) + (1 << PAGE_SHIFT));
+ page = (struct page *)p;
+
+ atomic_set(&page->_count, 1);
+ page->flags = 0;
+ pointer = (unsigned long)page;
+ pointer += sizeof(struct page);
+ page->virtual = (void *)pointer;
+ return page;
+}
+void __free_pages(struct page *page, unsigned int order)
+{
+ /* typically, called from networking code by __free_page */
+ lib_assert(order == 0);
+ lib_free(page);
+}
+
+void put_page(struct page *page)
+{
+ if (atomic_dec_and_test(&page->_count))
+ lib_free(page);
+}
+unsigned long get_zeroed_page(gfp_t gfp_mask)
+{
+ return __get_free_pages(gfp_mask | __GFP_ZERO, 0);
+}
+
+void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
+{
+ return alloc_pages(gfp_mask, get_order(size));
+}
+
+unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order)
+{
+ int size = (1 << order) * PAGE_SIZE;
+ void *p = kmalloc(size, gfp_mask);
+
+ return (unsigned long)p;
+}
+void free_pages(unsigned long addr, unsigned int order)
+{
+ if (addr != 0)
+ kfree((void *)addr);
+}
+
+void *vmalloc(unsigned long size)
+{
+ return lib_malloc(size);
+}
+void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
+{
+ return kmalloc(size, gfp_mask);
+}
+void vfree(const void *addr)
+{
+ lib_free((void *)addr);
+}
+void *vmalloc_node(unsigned long size, int node)
+{
+ return lib_malloc(size);
+}
+void vmalloc_sync_all(void)
+{
+}
+void *__alloc_percpu(size_t size, size_t align)
+{
+ return kzalloc(size, GFP_KERNEL);
+}
+void free_percpu(void __percpu *ptr)
+{
+ kfree(ptr);
+}
+void *__alloc_bootmem_nopanic(unsigned long size,
+ unsigned long align,
+ unsigned long goal)
+{
+ return kzalloc(size, GFP_KERNEL);
+}
--
2.1.0


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