[U-Boot] [PATCH v9 09/18] sandbox: Align RAM buffer to the machine page size

[Simon Glass]

At present the sandbox RAM buffer is not aligned to any particular
address boundary. This makes the internal pointers somewhat random with
respect to the associated RAM buffer addresses.

Align the buffer to the page size of the machine to help with this.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 arch/sandbox/cpu/os.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index 5839932b005..a1a982af2de 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -143,14 +143,15 @@ void os_tty_raw(int fd, bool allow_sigs)
 void *os_malloc(size_t length)
 {
 	struct os_mem_hdr *hdr;
+	int page_size = getpagesize();
 
-	hdr = mmap(NULL, length + sizeof(*hdr), PROT_READ | PROT_WRITE,
-		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	hdr = mmap(NULL, length + page_size,
+		   PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 	if (hdr == MAP_FAILED)
 		return NULL;
 	hdr->length = length;
 
-	return hdr + 1;
+	return (void *)hdr + page_size;
 }
 
 void os_free(void *ptr)
-- 
2.18.0.597.ga71716f1ad-goog