UPSTREAM: ACPI S3: Remove HIGH_MEMORY_SAVE where possible

Add implementation to use actual requirements of ramstage size
for S3 resume backup in CBMEM. The backup covers complete pages of 4 KiB.

Only the required amount of low memory is backed up when ACPI_TINY_LOWMEM_BACKUP
is selected for the platform. Enable this option for AGESA and binaryPI, other
platforms (without RELOCATABLE_RAMSTAGE) currently keep their romstage ramstack
in low memory for s3 resume path.

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Kysti Mlkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15255
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>

Change-Id: Ide7ce013f3727c2928cdb00fbcc7e7e84e859ff1
Reviewed-on: https://chromium-review.googlesource.com/410076
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/include/cbfs.h

@@ -47,6 +47,9 @@ size_t cbfs_boot_load_struct(const char *name, void *buf, size_t buf_size);
 size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
 	size_t in_size, void *buffer, size_t buffer_size, uint32_t compression);
 
+/* Return the size and fill base of the memory pstage will occupy after loaded. */
+size_t cbfs_prog_stage_section(struct prog *pstage, uintptr_t *base);
+
 /* Load stage into memory filling in prog. Return 0 on success. < 0 on error. */
 int cbfs_prog_stage_load(struct prog *prog);
 

src/include/program_loading.h

@@ -173,6 +173,10 @@ uintptr_t romstage_ram_stack_base(size_t size, int src);
 uintptr_t romstage_ram_stack_top(void);
 uintptr_t romstage_ram_stack_bottom(void);
 
+/* Backup OS memory to CBMEM_ID_RESUME on ACPI S3 resume path,
+ * if ramstage overwrites low memory. */
+void backup_ramstage_section(uintptr_t base, size_t size);
+
 /***********************
  *   PAYLOAD LOADING   *
  ***********************/