[U-Boot] [PATCH 32/38] x86: fsp: Save usable RAM and hob_list in the handoff area

[Simon Glass]

The useable RAM is calculated when the RAM is inited. Save this value so
that it can be easily used in U-Boot proper.

Also save a pointer to the hob list so that it is accessible (before
relocation only) in U-Boot proper. This avoids having to scan it in SPL,
for everything U-Boot proper might need later.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/x86/cpu/intel_common/cpu_from_spl.c |  6 ++++++
 arch/x86/include/asm/handoff.h           |  8 ++++++++
 arch/x86/lib/fsp/fsp_dram.c              | 10 ++++++++++
 3 files changed, 24 insertions(+)

diff --git a/arch/x86/cpu/intel_common/cpu_from_spl.c b/arch/x86/cpu/intel_common/cpu_from_spl.c
index a6233c75ce..b7bb524162 100644
--- a/arch/x86/cpu/intel_common/cpu_from_spl.c
+++ b/arch/x86/cpu/intel_common/cpu_from_spl.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <handoff.h>
 #include <asm/cpu_common.h>
 #include <asm/intel_regs.h>
 #include <asm/lapic.h>
@@ -21,6 +22,11 @@ int arch_cpu_init(void)
 {
 	int ret;
 
+#if CONFIG_IS_ENABLED(HANDOFF) && IS_ENABLED(CONFIG_USE_HOB)
+	struct spl_handoff *ho = gd->spl_handoff;
+
+	gd->arch.hob_list = ho->arch.hob_list;
+#endif
 	ret = x86_cpu_reinit_f();
 
 	return ret;
diff --git a/arch/x86/include/asm/handoff.h b/arch/x86/include/asm/handoff.h
index 4d18d59efe..aec49b9b81 100644
--- a/arch/x86/include/asm/handoff.h
+++ b/arch/x86/include/asm/handoff.h
@@ -9,7 +9,15 @@
 #ifndef __x86_asm_handoff_h
 #define __x86_asm_handoff_h
 
+/**
+ * struct arch_spl_handoff - architecture-specific handoff info
+ *
+ * @usable_ram_top: Value returned by board_get_usable_ram_top() in SPL
+ * @hob_list: Start of FSP hand-off blocks (HOBs)
+ */
 struct arch_spl_handoff {
+	ulong usable_ram_top;
+	void *hob_list;
 };
 
 #endif
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 8fe1e0bf73..38cc25839e 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -88,3 +88,13 @@ unsigned int install_e820_map(unsigned int max_entries,
 
 	return num_entries;
 }
+
+#if CONFIG_IS_ENABLED(HANDOFF)
+int handoff_arch_save(struct spl_handoff *ho)
+{
+	ho->arch.usable_ram_top = fsp_get_usable_lowmem_top(gd->arch.hob_list);
+	ho->arch.hob_list = gd->arch.hob_list;
+
+	return 0;
+}
+#endif
-- 
2.23.0.187.g17f5b7556c-goog