diff options
Diffstat (limited to 'common/shared_mem.c')
| -rw-r--r-- | common/shared_mem.c | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/common/shared_mem.c b/common/shared_mem.c index bff3ec6da3..63edd7e755 100644 --- a/common/shared_mem.c +++ b/common/shared_mem.c @@ -1,35 +1,30 @@ -/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. +/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ /* Shared memory module for Chrome EC */ +#include "config.h" +#include "link_defs.h" #include "shared_mem.h" -#include "uart.h" +#include "system.h" -/* Size of shared memory buffer */ -#define SHARED_MEM_SIZE 4096 - -static char shared_buf[SHARED_MEM_SIZE]; -static int buf_in_use = 0; - - -int shared_mem_init(void) -{ - return EC_SUCCESS; -} +static int buf_in_use; int shared_mem_size(void) { - return SHARED_MEM_SIZE; + /* Use all the RAM we can. The shared memory buffer is the + * last thing allocated from the start of RAM, so we can use + * everything up to the jump data at the end of RAM. */ + return system_usable_ram_end() - (uint32_t)__shared_mem_buf; } int shared_mem_acquire(int size, int wait, char **dest_ptr) { - if (size > SHARED_MEM_SIZE || size <= 0) + if (size > shared_mem_size() || size <= 0) return EC_ERROR_INVAL; /* TODO: if task_start() hasn't been called, fail immediately @@ -42,7 +37,7 @@ int shared_mem_acquire(int size, int wait, char **dest_ptr) /* TODO: atomically acquire buf_in_use. */ buf_in_use = 1; - *dest_ptr = shared_buf; + *dest_ptr = __shared_mem_buf; return EC_SUCCESS; } |