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authorAaron Durbin <adurbin@chromium.org>2015-05-26 11:15:45 -0500
committerAaron Durbin <adurbin@chromium.org>2015-05-26 19:06:48 +0200
commit28d5ec9a7d8fe11175c8907cc6fa0305c469b194 (patch)
tree6e5f82e8b0f6fe01c283398e6faa2fbc96b3bae5 /src/include/cbmem.h
parentaadf2b8b59adec05a84e4884ba76bc2ebc4d9b00 (diff)
downloadcoreboot-28d5ec9a7d8fe11175c8907cc6fa0305c469b194.tar.xz
x86: provide consistent cbmem_top() for CONFIG_LATE_CBMEM_INIT
For x86 systems employing CONFIG_LATE_CBMEM_INIT, set_top_of_ram() is called in ramstage to note the upper address of the 32-bit address space. This in turn is consumed by cbmem. However, in this scenario cbmem_top() cannot always be relied upon because get_top_of_ram() doesn't return the same value provided to set_top_of_ram(). To fix the inconsistency in ramstage save the value passed in to set_top_of_ram() and defer to it as the return value for cbmem_top(). Change-Id: Ida796fb836c59b9776019e7f8b3f2cd71156f0e5 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/10313 Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/include/cbmem.h')
-rw-r--r--src/include/cbmem.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 20cc174d05..0a7ca89cd4 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -221,6 +221,9 @@ void cbmem_list(void);
* early features like COLLECT_TIMESTAMPS and CBMEM_CONSOLE.
*/
#if IS_ENABLED(CONFIG_ARCH_X86) && IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
+/* Note that many of the current providers of get_top_of_ram() conditionally
+ * return 0 when the sleep type is non S3. i.e. cold and warm boots would
+ * return 0 from get_top_of_ram(). */
unsigned long get_top_of_ram(void);
void set_top_of_ram(uint64_t ramtop);
void backup_top_of_ram(uint64_t ramtop);