From 823020d56be1bf6425b4e433a1f1c2bbc2c4c90b Mon Sep 17 00:00:00 2001 From: Kyösti Mälkki Date: Fri, 22 Jul 2016 22:53:19 +0300 Subject: intel i945 gm45 x4x post-car: Use postcar_frame for MTRR setup MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Adapt implementation from skylake to prepare for removal of HIGH_MEMORY_SAVE and moving on to RELOCATABLE_RAMSTAGE. With this change, CBMEM region is set early-on as WRBACK with MTRRs and romstage ram stack is moved to CBMEM. Change-Id: Idee5072fd499aa3815b0d78f54308c273e756fd1 Signed-off-by: Kyösti Mälkki Reviewed-on: https://review.coreboot.org/15791 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/northbridge/intel/gm45/ram_calc.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'src/northbridge/intel/gm45') diff --git a/src/northbridge/intel/gm45/ram_calc.c b/src/northbridge/intel/gm45/ram_calc.c index c22b491c66..780bed48b1 100644 --- a/src/northbridge/intel/gm45/ram_calc.c +++ b/src/northbridge/intel/gm45/ram_calc.c @@ -18,11 +18,14 @@ #define __SIMPLE_DEVICE__ #include +#include #include #include #include #include +#include #include +#include #include "gm45.h" /* @@ -92,7 +95,36 @@ void *cbmem_top(void) return (void *) top_of_ram; } +#define ROMSTAGE_RAM_STACK_SIZE 0x5000 + +/* setup_stack_and_mtrrs() determines the stack to use after + * cache-as-ram is torn down as well as the MTRR settings to use. */ void *setup_stack_and_mtrrs(void) { - return (void*)CONFIG_RAMTOP; + struct postcar_frame pcf; + uintptr_t top_of_ram; + + if (postcar_frame_init(&pcf, ROMSTAGE_RAM_STACK_SIZE)) + die("Unable to initialize postcar frame.\n"); + + /* Cache the ROM as WP just below 4GiB. */ + postcar_frame_add_mtrr(&pcf, -CACHE_ROM_SIZE, CACHE_ROM_SIZE, + MTRR_TYPE_WRPROT); + + /* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */ + postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); + + /* Cache two separate 4 MiB regions below the top of ram, this + * satisfies MTRR alignment requirements. If you modify this to + * cover TSEG, make sure UMA region is not set with WRBACK as it + * causes hard-to-recover boot failures. + */ + top_of_ram = (uintptr_t)cbmem_top(); + postcar_frame_add_mtrr(&pcf, top_of_ram - 4*MiB, 4*MiB, MTRR_TYPE_WRBACK); + postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 4*MiB, MTRR_TYPE_WRBACK); + + /* Save the number of MTRRs to setup. Return the stack location + * pointing to the number of MTRRs. + */ + return postcar_commit_mtrrs(&pcf); } -- cgit v1.2.3