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-rw-r--r--src/arch/x86/boot/cbmem.c20
-rw-r--r--src/include/cbmem.h3
2 files changed, 22 insertions, 1 deletions
diff --git a/src/arch/x86/boot/cbmem.c b/src/arch/x86/boot/cbmem.c
index 9ee5db49f0..f48e46aa80 100644
--- a/src/arch/x86/boot/cbmem.c
+++ b/src/arch/x86/boot/cbmem.c
@@ -34,10 +34,23 @@ void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
/* Do nothing. Chipset may have implementation to save ramtop in NVRAM. */
}
+static void *ramtop_pointer;
+
void set_top_of_ram(uint64_t ramtop)
{
backup_top_of_ram(ramtop);
- cbmem_set_top((void*)(uintptr_t)ramtop);
+ ramtop_pointer = (void *)(uintptr_t)ramtop;
+ cbmem_set_top(ramtop_pointer);
+}
+
+static inline void *saved_ramtop(void)
+{
+ return ramtop_pointer;
+}
+#else
+static inline void *saved_ramtop(void)
+{
+ return NULL;
}
#endif /* !__PRE_RAM__ */
@@ -50,6 +63,11 @@ unsigned long __attribute__((weak)) get_top_of_ram(void)
void *cbmem_top(void)
{
/* Top of cbmem is at lowest usable DRAM address below 4GiB. */
+ void *ptr = saved_ramtop();
+
+ if (ptr != NULL)
+ return ptr;
+
return (void *)get_top_of_ram();
}
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);