[PATCH 4/9] move x86's simple heap management to common code

[Andrew Jones <drjones@xxxxxxxxxx>]

Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
 config/config-x86-common.mak |  1 +
 lib/heap.c                   | 43 +++++++++++++++++++++++++++++++++++++++++++
 lib/heap.h                   |  8 ++++++++
 lib/x86/vm.c                 | 33 ++-------------------------------
 4 files changed, 54 insertions(+), 31 deletions(-)
 create mode 100644 lib/heap.c
 create mode 100644 lib/heap.h

diff --git a/config/config-x86-common.mak b/config/config-x86-common.mak
index 917cbbf801a65..8a78f7a6c8849 100644
--- a/config/config-x86-common.mak
+++ b/config/config-x86-common.mak
@@ -2,6 +2,7 @@
 
 all: test_cases
 
+cflatobjs += lib/heap.o
 cflatobjs += lib/x86/io.o
 cflatobjs += lib/x86/smp.o
 cflatobjs += lib/x86/vm.o
diff --git a/lib/heap.c b/lib/heap.c
new file mode 100644
index 0000000000000..e52ee0edba163
--- /dev/null
+++ b/lib/heap.c
@@ -0,0 +1,43 @@
+#include "libcflat.h"
+
+static size_t pagesize;
+static void *free_head;
+
+void heap_init(void *start, size_t size, size_t page_size)
+{
+	unsigned long s = (unsigned long)start;
+	void *p = start;
+
+	pagesize = page_size;
+
+	if (s != (s & ~(pagesize - 1))) {
+		s += pagesize;
+		s &= ~(pagesize - 1);
+		p = (void *)s;
+	}
+
+	while (size >= pagesize) {
+		*(void **)p = free_head;
+		free_head = p;
+		p += pagesize;
+		size -= pagesize;
+	}
+}
+
+void *alloc_page(void)
+{
+	void *p;
+
+	if (!free_head)
+		return NULL;
+
+	p = free_head;
+	free_head = *(void **)free_head;
+	return p;
+}
+
+void free_page(void *page)
+{
+	*(void **)page = free_head;
+	free_head = page;
+}
diff --git a/lib/heap.h b/lib/heap.h
new file mode 100644
index 0000000000000..78b893021ae92
--- /dev/null
+++ b/lib/heap.h
@@ -0,0 +1,8 @@
+#ifndef _HEAP_H_
+#define _HEAP_H_
+#include "libcflat.h"
+
+extern void heap_init(void *start, size_t size, size_t page_size);
+extern void *alloc_page(void);
+extern void free_page(void *page);
+#endif
diff --git a/lib/x86/vm.c b/lib/x86/vm.c
index 188bf57587aa7..725cfe33259c2 100644
--- a/lib/x86/vm.c
+++ b/lib/x86/vm.c
@@ -1,6 +1,7 @@
 #include "fwcfg.h"
 #include "vm.h"
 #include "libcflat.h"
+#include "heap.h"
 
 #define PAGE_SIZE 4096ul
 #ifdef __x86_64__
@@ -9,38 +10,8 @@
 #define LARGE_PAGE_SIZE (1024 * PAGE_SIZE)
 #endif
 
-static void *free = 0;
 static void *vfree_top = 0;
 
-static void free_memory(void *mem, unsigned long size)
-{
-    while (size >= PAGE_SIZE) {
-	*(void **)mem = free;
-	free = mem;
-	mem += PAGE_SIZE;
-	size -= PAGE_SIZE;
-    }
-}
-
-void *alloc_page()
-{
-    void *p;
-
-    if (!free)
-	return 0;
-
-    p = free;
-    free = *(void **)free;
-
-    return p;
-}
-
-void free_page(void *page)
-{
-    *(void **)page = free;
-    free = page;
-}
-
 extern char edata;
 static unsigned long end_of_memory;
 
@@ -185,7 +156,7 @@ static void setup_mmu(unsigned long len)
 void setup_vm()
 {
     end_of_memory = fwcfg_get_u64(FW_CFG_RAM_SIZE);
-    free_memory(&edata, end_of_memory - (unsigned long)&edata);
+    heap_init(&edata, end_of_memory - (unsigned long)&edata, PAGE_SIZE);
     setup_mmu(end_of_memory);
 }
 
-- 
1.8.1.4

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