sandbox: Align RAM buffer to the machine page size

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@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index 5839932b00571538d3e8291694f3e6a692e14dae..a1a982af2de605e3048f460a5a8afbbb6b1ec710 100644 (file)
--- 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)