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authorAaron Durbin <adurbin@chromium.org>2013-05-10 00:45:37 -0500
committerAaron Durbin <adurbin@google.com>2013-05-16 01:30:17 +0200
commit2ad6bd23a7ebcaf593f717db9c356284237ed639 (patch)
treeae86ae82dcf7953c7aacbe9624f16f6a86e09a76 /src/lib/cbmem_console.c
parent677e1558c32d1c88ade486e5ac42e60a3da1fdcf (diff)
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cbmem console: use cache-as-ram API and cleanup
Allow for automatic cache-as-ram migration for the cbmem console. The code was refactored in the thought of making it easier to read. The #ifdefs still exist, but they are no longer sprinkled throughout the code. The cbmem_console_p variable now exists globally in both romstage and ramstage. However, the cbmem_console_p is referenced using the cache-as-ram API. When cbmem is initialized the console is automatically copied over by calling cbmemc_reinit() through a callback. Change-Id: I9f4a64e33c58b8b7318db27942e37c13804e6f2c Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/3235 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/lib/cbmem_console.c')
-rw-r--r--src/lib/cbmem_console.c93
1 files changed, 60 insertions, 33 deletions
diff --git a/src/lib/cbmem_console.c b/src/lib/cbmem_console.c
index 2e22decd6..efb8e86f8 100644
--- a/src/lib/cbmem_console.c
+++ b/src/lib/cbmem_console.c
@@ -34,6 +34,8 @@ struct cbmem_console {
u8 buffer_body[0];
} __attribute__ ((__packed__));
+static struct cbmem_console *cbmem_console_p CAR_GLOBAL;
+
#ifdef __PRE_RAM__
/*
* While running from ROM, before DRAM is initialized, some area in cache as
@@ -42,7 +44,6 @@ struct cbmem_console {
*/
static struct cbmem_console car_cbmem_console CAR_CBMEM;
-#define cbmem_console_p (&car_cbmem_console)
/*
* Once DRAM is initialized and the cache as ram mode is disabled, while still
@@ -54,6 +55,7 @@ static struct cbmem_console car_cbmem_console CAR_CBMEM;
* find out where the actual console log buffer is.
*/
#define CBMEM_CONSOLE_REDIRECT (*((struct cbmem_console **)0x600))
+
#else
/*
@@ -63,41 +65,64 @@ static struct cbmem_console car_cbmem_console CAR_CBMEM;
* during the ROM stage, once CBMEM becomes available at RAM stage.
*/
static u8 static_console[40000];
-static struct cbmem_console *cbmem_console_p;
#endif
+static inline struct cbmem_console *current_console(void)
+{
+#if CONFIG_CAR_MIGRATION || !defined(__PRE_RAM__)
+ return car_get_var(cbmem_console_p);
+#else
+ /*
+ * This check allows to tell if the cache as RAM mode has been exited
+ * or not. If it has been exited, the real memory is being used
+ * (resulting in the variable on the stack located below
+ * DCACHE_RAM_BASE), use the redirect pointer to find out where the
+ * actual console buffer is.
+ */
+ if ((uintptr_t)__builtin_frame_address(0) <
+ (uintptr_t)CONFIG_DCACHE_RAM_BASE)
+ return CBMEM_CONSOLE_REDIRECT;
+ return car_get_var(cbmem_console_p);
+#endif /* CONFIG_CAR_MIGRATION */
+}
+
+static inline void current_console_set(struct cbmem_console *new_console_p)
+{
+#if CONFIG_CAR_MIGRATION || !defined(__PRE_RAM__)
+ car_set_var(cbmem_console_p, new_console_p);
+#else
+ CBMEM_CONSOLE_REDIRECT = new_console_p;
+#endif
+}
+
+static inline void init_console_ptr(void *storage, u32 total_space)
+{
+ struct cbmem_console *cbm_cons_p = storage;
+
+ /* Initialize the cache-as-ram pointer and underlying structure. */
+ car_set_var(cbmem_console_p, cbm_cons_p);
+ cbm_cons_p->buffer_size = total_space - sizeof(struct cbmem_console);
+ cbm_cons_p->buffer_cursor = 0;
+}
+
void cbmemc_init(void)
{
#ifdef __PRE_RAM__
- cbmem_console_p->buffer_size = CONFIG_CONSOLE_CAR_BUFFER_SIZE -
- sizeof(struct cbmem_console);
+ init_console_ptr(&car_cbmem_console, CONFIG_CONSOLE_CAR_BUFFER_SIZE);
#else
/*
* Initializing before CBMEM is available, use static buffer to store
* the log.
*/
- cbmem_console_p = (struct cbmem_console *) static_console;
- cbmem_console_p->buffer_size = sizeof(static_console) -
- sizeof(struct cbmem_console);
+ init_console_ptr(static_console, sizeof(static_console));
#endif
- cbmem_console_p->buffer_cursor = 0;
}
void cbmemc_tx_byte(unsigned char data)
{
- struct cbmem_console *cbm_cons_p = cbmem_console_p;
+ struct cbmem_console *cbm_cons_p = current_console();
u32 cursor;
-#ifdef __PRE_RAM__
- /*
- * This check allows to tell if the cache as RAM mode has been exited
- * or not. If it has been exited, the real memory is being used
- * (resulting in the variable on the stack located below
- * DCACHE_RAM_BASE), use the redirect pointer to find out where the
- * actual console buffer is.
- */
- if ((uintptr_t)&cursor < (uintptr_t)&car_cbmem_console)
- cbm_cons_p = CBMEM_CONSOLE_REDIRECT;
-#endif
+
if (!cbm_cons_p)
return;
@@ -119,14 +144,17 @@ static void copy_console_buffer(struct cbmem_console *new_cons_p)
{
u32 copy_size;
u32 cursor = new_cons_p->buffer_cursor;
- int overflow = cbmem_console_p->buffer_cursor >
- cbmem_console_p->buffer_size;
+ struct cbmem_console *old_cons_p;
+ int overflow;
+
+ old_cons_p = current_console();
+
+ overflow = old_cons_p->buffer_cursor > old_cons_p->buffer_size;
copy_size = overflow ?
- cbmem_console_p->buffer_size : cbmem_console_p->buffer_cursor;
+ old_cons_p->buffer_size : old_cons_p->buffer_cursor;
- memcpy(new_cons_p->buffer_body + cursor,
- cbmem_console_p->buffer_body,
+ memcpy(new_cons_p->buffer_body + cursor, old_cons_p->buffer_body,
copy_size);
cursor += copy_size;
@@ -134,7 +162,7 @@ static void copy_console_buffer(struct cbmem_console *new_cons_p)
if (overflow) {
const char loss_str1[] = "\n\n*** Log truncated, ";
const char loss_str2[] = " characters dropped. ***\n\n";
- u32 dropped_chars = cbmem_console_p->buffer_cursor - copy_size;
+ u32 dropped_chars = old_cons_p->buffer_cursor - copy_size;
/*
* When running from ROM sprintf is not available, a simple
@@ -173,7 +201,7 @@ void cbmemc_reinit(void)
cbm_cons_p = cbmem_add(CBMEM_ID_CONSOLE,
CONFIG_CONSOLE_CBMEM_BUFFER_SIZE);
if (!cbm_cons_p) {
- CBMEM_CONSOLE_REDIRECT = NULL;
+ current_console_set(NULL);
return;
}
@@ -181,18 +209,17 @@ void cbmemc_reinit(void)
sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
-
- copy_console_buffer(cbm_cons_p);
-
- CBMEM_CONSOLE_REDIRECT = cbm_cons_p;
#else
cbm_cons_p = cbmem_find(CBMEM_ID_CONSOLE);
if (!cbm_cons_p)
return;
+#endif
copy_console_buffer(cbm_cons_p);
- cbmem_console_p = cbm_cons_p;
-#endif
+ current_console_set(cbm_cons_p);
}
+
+/* Call cbmemc_reinit() at CAR migration time. */
+CAR_MIGRATE(cbmemc_reinit)