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drivers/intel/fsp1_1: Adjust postcar MTRRs 

Use of romstage_ram_stack_bottom() was invalid, it
potentially uses a different ROMSTAGE_RAM_STACK_SIZE
from the postcar_frame_init() call.

If alignment evaluated to 1 MiB, that WB MTRR may not
have covered all of CBMEM range, having some impact
on boot speeds.

There is no need to accurately describe write-back
MTRR ranges for postcar.

Change-Id: Icb65cef079df56fadcc292c648cab8bdbb667f47
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33927
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Kyösti Mälkki 2019-06-30 21:00:07 +03:00
parent 2874330828
commit 8f23b5d434
1 changed files with 7 additions and 49 deletions
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56
src/drivers/intel/fsp1_1/car.c
View File

@ -14,6 +14,7 @@
*/
#include <arch/symbols.h>
#include <cbmem.h>
#include <console/console.h>
#include <commonlib/helpers.h>
#include <cpu/intel/romstage.h>
@ -32,8 +33,7 @@
void platform_enter_postcar(void)
{
struct postcar_frame pcf;
size_t alignment;
uint32_t aligned_ram;
uintptr_t top_of_ram;
if (postcar_frame_init(&pcf, ROMSTAGE_RAM_STACK_SIZE))
die("Unable to initialize postcar frame.\n");
@ -44,53 +44,11 @@ void platform_enter_postcar(void)
/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
/*
* +-------------------------+ Top of RAM (aligned)
* | System Management Mode |
* | code and data | Length: CONFIG_TSEG_SIZE
* | (TSEG) |
* +-------------------------+ SMM base (aligned)
* | |
* | Chipset Reserved Memory | Length: Multiple of CONFIG_TSEG_SIZE
* | |
* +-------------------------+ top_of_ram (aligned)
* | |
* | CBMEM Root |
* | |
* +-------------------------+
* | |
* | FSP Reserved Memory |
* | |
* +-------------------------+
* | |
* | Various CBMEM Entries |
* | |
* +-------------------------+ top_of_stack (8 byte aligned)
* | |
* | stack (CBMEM Entry) |
* | |
* +-------------------------+
*/
alignment = mmap_region_granularity();
aligned_ram = ALIGN_DOWN(romstage_ram_stack_bottom(), alignment);
postcar_frame_add_mtrr(&pcf, aligned_ram, alignment, MTRR_TYPE_WRBACK);
if (CONFIG(HAVE_SMI_HANDLER)) {
void *smm_base;
size_t smm_size;
/*
* Cache the TSEG region at the top of ram. This region is not
* restricted to SMM mode until SMM has been relocated. By
* setting the region to cacheable it provides faster access
* when relocating the SMM handler as well as using the TSEG
* region for other purposes.
*/
smm_region(&smm_base, &smm_size);
postcar_frame_add_mtrr(&pcf, (uintptr_t)smm_base, alignment,
MTRR_TYPE_WRBACK);
}
/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
* above top of the ram. This satisfies MTRR alignment requirement
* with different TSEG size configurations. */
top_of_ram = ALIGN_DOWN((uintptr_t)cbmem_top(), 8*MiB);
postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 16*MiB, MTRR_TYPE_WRBACK);
run_postcar_phase(&pcf);
}