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soc/intel/skylake: Use C entry code for MTRR programming 

Make skylake cache as ram SPI mapped MTRR programming
align with apollolake code.

Change-Id: I87a5c655da8ff5f6d8ef86907b7ae2263239b1ac
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/18923
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Subrata Banik 2017-03-20 20:33:10 +05:30 committed by Aaron Durbin
parent ccc21ca685
commit 6e260fc873
2 changed files with 30 additions and 41 deletions
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45
src/soc/intel/skylake/bootblock/cache_as_ram.S
View File

@ -231,6 +231,7 @@ find_llc_subleaf:
xorl %edx, %edx
wrmsr
post_code(0x27)
/*
* Enable No-Eviction Mode Run State by setting
* NO_EVICT_MODE MSR 2E0h bit [1] = '1'.
@ -241,53 +242,15 @@ find_llc_subleaf:
orl $0x02, %eax
wrmsr
post_code(0x27)
/*
* Configure the BIOS code region as write-protected (WP) cacheable
* memory type using a single variable range MTRR.
*
* Ensure region to cache meets MTRR requirements for
* size and alignment.
*/
movl $(0xFFFFFFFF - CONFIG_ROM_SIZE + 1), %edi /* Code region base */
movl $CONFIG_ROM_SIZE, %eax /* Code region size */
cmpl $0, %edi
jz .halt_forever
cmpl $0, %eax
jz .halt_forever
post_code(0x28)
/*
* Program base register
*/
xorl %edx, %edx /* clear upper dword */
movl $MTRR_PHYS_BASE(1), %ecx /* setup variable mtrr */
movl %edi, %eax
orl $MTRR_TYPE_WRPROT, %eax /* set type to write protect */
wrmsr
movl $CONFIG_ROM_SIZE, %eax
/*
* Compute MTRR mask value: Mask = NOT (Size - 1)
*/
dec %eax /* eax - size to cache less one byte */
not %eax /* eax contains low 32 bits of mask */
or $MTRR_PHYS_MASK_VALID, %eax
/*
* Program mask register
*/
movl $MTRR_PHYS_MASK(1) , %ecx /* setup variable mtrr */
movl %esi, %edx /* edx <- MTRR_PHYS_MASK_HIGH */
wrmsr
car_init_done:
post_code(0x29)
post_code(0x28)
/* Setup bootblock stack */
mov $_car_stack_end, %esp
post_code(0x29)
/*push TSC value to stack*/
movd %mm2, %eax
pushl %eax /* tsc[63:32] */

26
src/soc/intel/skylake/bootblock/cpu.c
View File

@ -18,8 +18,10 @@
#include <delay.h>
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/mtrr.h>
#include <cpu/intel/microcode/microcode.c>
#include <reset.h>
#include <lib.h>
#include <soc/bootblock.h>
#include <soc/cpu.h>
#include <soc/iomap.h>
@ -101,8 +103,32 @@ static void set_flex_ratio_to_tdp_nominal(void)
soft_reset();
}
static void cache_bios_region(void)
{
int mtrr;
size_t rom_size;
uint32_t alignment;
mtrr = get_free_var_mtrr();
if (mtrr == -1)
return;
/* Only the IFD BIOS region is memory mapped (at top of 4G) */
rom_size = CONFIG_ROM_SIZE;
if (!rom_size)
return;
/* Round to power of two */
alignment = 1 << (log2_ceil(rom_size));
rom_size = ALIGN_UP(rom_size, alignment);
set_var_mtrr(mtrr, 4ULL*GiB - rom_size, rom_size, MTRR_TYPE_WRPROT);
}
void bootblock_cpu_init(void)
{
cache_bios_region();
/* Set flex ratio and reset if needed */
set_flex_ratio_to_tdp_nominal();
intel_update_microcode_from_cbfs();