[U-Boot] [PATCH v10 03/10] 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. Note
that there is a header at the start of the allocated pointer. To avoid
returning a pointer which is not aligned to a page boundary, we waste
almost an entire page of memory for each allocation.

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

Changes in v10:
- Explain the padding of the returned pointer in the commit message

Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: 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)
-- 
2.19.0.397.gdd90340f6a-goog