Change in coreboot[master]: src/lib/prog_loaders: Add preload_ramstage

[Raul Rangel (Code Review)]

Attention is currently required from: Martin Roth.
Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/58982 )

Change subject: src/lib/prog_loaders: Add preload_ramstage
......................................................................

src/lib/prog_loaders: Add preload_ramstage

This will enable preloading ramstage. By preloading the file into
cbfs_cache we reduce boot time.

BUG=b:179699789
TEST=Boot guybrush to OS and see 12ms reduction in boot time.

Signed-off-by: Raul E Rangel 
Change-Id: Ibe12de806449da25bc0033b02fcb97c3384eddc1
---
M Makefile.inc
M src/include/program_loading.h
M src/lib/prog_loaders.c
3 files changed, 19 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/82/58982/1

diff --git a/Makefile.inc b/Makefile.inc
index b784f3e..f14bc1e 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1214,6 +1214,10 @@
 $(CONFIG_CBFS_PREFIX)/ramstage-file := $(RAMSTAGE)
 $(CONFIG_CBFS_PREFIX)/ramstage-type := stage
 $(CONFIG_CBFS_PREFIX)/ramstage-compression := $(CBFS_COMPRESS_FLAG)
+# The AMD LPC SPI DMA controller requires source files to be 64 byte aligned.
+ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA),y)
+$(CONFIG_CBFS_PREFIX)/ramstage-align := 64
+endif

cbfs-files-$(CONFIG_HAVE_REFCODE_BLOB) += $(CONFIG_CBFS_PREFIX)/refcode
 $(CONFIG_CBFS_PREFIX)/refcode-file := $(REFCODE_BLOB)
diff --git a/src/include/program_loading.h b/src/include/program_loading.h
index 5b9a94d..ba42465 100644
--- a/src/include/program_loading.h
+++ b/src/include/program_loading.h
@@ -145,6 +145,13 @@
  *   RAMSTAGE LOADING   *
  ************************/

+/*
+ * Asynchronously preloads ramstage.
+ *
+ * This should be called early on to allow ramstage to load before
+ * `run_ramstage` is called.
+ */
+void preload_ramstage(void);
 /* Run ramstage from romstage. */
 void run_ramstage(void);

diff --git a/src/lib/prog_loaders.c b/src/lib/prog_loaders.c
index 1a361ea..671cd8a 100644
--- a/src/lib/prog_loaders.c
+++ b/src/lib/prog_loaders.c
@@ -75,7 +75,15 @@

return rmodule_stage_load(&rmod_ram);
 }
+void preload_ramstage(void)
+{
+	if (!CONFIG(CBFS_PRELOAD))
+		return;

+	printk(BIOS_DEBUG, "Preloading ramstage\n");
+
+	cbfs_preload(CONFIG_CBFS_PREFIX "/ramstage");
+}
 void run_ramstage(void)
 {
    struct prog ramstage =