New patch to review for coreboot: 7bbf17c x86: use boot state callbacks to disable rom cache

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3138

-gerrit

commit 7bbf17cc62f177f1f520818bc2ea49775af85abe
Author: Aaron Durbin 
Date:   Wed Apr 24 20:59:43 2013 -0500

x86: use boot state callbacks to disable rom cache

On x86 systems there is a concept of cachings the ROM. However,
    the typical policy is that the boot cpu is the only one with
    it enabled. In order to ensure the MTRRs are the same across cores
    the rom cache needs to be disabled prior to OS resume or boot handoff.
    Therefore, utilize the boot state callbacks to schedule the disabling
    of the ROM cache at the ramstage exit points.

Change-Id: I4da5886d9f1cf4c6af2f09bb909f0d0f0faa4e62
    Signed-off-by: Aaron Durbin 
---
 src/arch/x86/boot/acpi.c |  3 ---
 src/cpu/x86/mtrr/mtrr.c  | 10 +++++++++-
 src/include/cpu/cpu.h    |  3 ---
 src/lib/selfboot.c       |  4 ----
 4 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index a3bf718..3b77caa 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -637,9 +637,6 @@ void acpi_resume(void *wake_vec)
    /* Call mainboard resume handler first, if defined. */
    if (mainboard_suspend_resume)
    	mainboard_suspend_resume();
-	/* Tear down the caching of the ROM. */
-	if (disable_cache_rom)
-		disable_cache_rom();

post_code(POST_OS_RESUME);
    acpi_jump_to_wakeup(wake_vec);
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c
index 6089127..b69787b 100644
--- a/src/cpu/x86/mtrr/mtrr.c
+++ b/src/cpu/x86/mtrr/mtrr.c
@@ -27,6 +27,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
+#include <bootstate.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <cpu/cpu.h>
@@ -408,10 +409,17 @@ void x86_mtrr_disable_rom_caching(void)
    enable_cache();
 }

-void disable_cache_rom(void)
+static void disable_cache_rom(void *unused)
 {
    x86_mtrr_disable_rom_caching();
 }
+
+BOOT_STATE_INIT_ENTRIES(disable_rom_cache_bscb) = {
+	BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY,
+	                      disable_cache_rom, NULL),
+	BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT,
+	                      disable_cache_rom, NULL),
+};
 #endif

struct var_mtrr_state {
diff --git a/src/include/cpu/cpu.h b/src/include/cpu/cpu.h
index a2272f3..bed77de 100644
--- a/src/include/cpu/cpu.h
+++ b/src/include/cpu/cpu.h
@@ -9,9 +9,6 @@ struct bus;
 void initialize_cpus(struct bus *cpu_bus);
 void asmlinkage secondary_cpu_init(unsigned int cpu_index);

-/* If a ROM cache was set up disable it before jumping to the payload or OS. */
-void __attribute__((weak)) disable_cache_rom(void);
-
 #if CONFIG_HAVE_SMI_HANDLER
 void smm_init(void);
 void smm_lock(void);
diff --git a/src/lib/selfboot.c b/src/lib/selfboot.c
index 934c131..324d43e 100644
--- a/src/lib/selfboot.c
+++ b/src/lib/selfboot.c
@@ -537,10 +537,6 @@ int selfboot(struct lb_memory *mem, struct cbfs_payload *payload)
    timestamp_add_now(TS_SELFBOOT_JUMP);
 #endif

-	/* Tear down the caching of the ROM. */
-	if (disable_cache_rom)
-		disable_cache_rom();
-
    /* Before we go off to run the payload, see if
     * we stayed within our bounds.
     */