lcd/liblcd: Define page alloc/free helpers

Define helpers for __get_free_page(s) and free_page(s)
Signed-off-by: Vikram Narayanan <vikram186@gmail.com>

lcd-domains/config/isolated/lcd_config/post_hook.h

@@ -302,6 +302,12 @@ static inline void force_up_write(void *x)
 #undef __pa
 #define __pa(vaddr) gpa_val(lcd_gva2gpa(__gva((unsigned long)vaddr)))
 
+#undef free_page
+#define free_page(addr) __lcd_free_pages(addr, 0)
+
+#undef __get_free_page
+#define __get_free_page(gfp_mask) __lcd_get_free_pages(gfp_mask, 0)
+
 /* The "real" get_current tries to read a percpu variable that using
  * the %gs segment register. */
 #undef get_current

lcd-domains/include/liblcd/mem.h

@@ -183,6 +183,9 @@ void _lcd_munmap(cptr_t mo, gpa_t base);
  */
 struct page *lcd_alloc_pages_exact_node(int nid, unsigned int flags, 
 					unsigned int order);
+
+struct page *lcd_alloc_pages_node(int nid, unsigned int flags,
+					unsigned int order);
 /**
  * lcd_alloc_pages -- Get free pages from the heap
  * @flags: GFP flags to control allocation
@@ -191,6 +194,11 @@ struct page *lcd_alloc_pages_exact_node(int nid, unsigned int flags,
  * Similar to lcd_alloc_pages_exact_node.
  */
 struct page *lcd_alloc_pages(unsigned int flags, unsigned int order);
+
+void *__lcd_get_free_pages(gfp_t mask, unsigned int order);
+
+void __lcd_free_pages(unsigned long addr, unsigned int order);
+
 /**
  * lcd_free_pages -- Free pages allocated via lcd_alloc_pages
  * @base: pointer to first struct page in the chunk

lcd-domains/liblcd/lcd-domains/heap.c

@@ -331,6 +331,15 @@ static inline struct lcd_page_block *heap_struct_page_to_page_block(
 
 /* PAGE ALLOC INTERFACE ---------------------------------------- */
 
+struct page *lcd_alloc_pages_node(int nid, unsigned int flags,
+					unsigned int order)
+{
+	/*
+	 * For now, we ignore the node id (not numa aware).
+	 */
+	return lcd_alloc_pages(flags, order);
+}
+
 struct page *lcd_alloc_pages_exact_node(int nid, unsigned int flags, 
 					unsigned int order)
 {
@@ -551,3 +560,15 @@ fail2:
 fail1:
 	return ret;
 }
+
+void *__lcd_get_free_pages(gfp_t mask, unsigned int order)
+{
+	struct page *p = lcd_alloc_pages(mask, order);
+	return p ? lcd_page_address(p) : NULL;
+}
+
+void __lcd_free_pages(unsigned long addr, unsigned int order)
+{
+	if (addr)
+		lcd_free_pages(heap_addr_to_struct_page(__gva(addr)), order);
+}