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nb/intel/gm45: Correctly cache TSEG 

Change-Id: I6a8752da9f92b90a2cb2cca5ebf28e2bc5a9c9a8
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/29866
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Arthur Heymans 2018-11-27 14:06:21 +01:00
parent 66c22508c7
commit 009518e79b
3 changed files with 14 additions and 22 deletions
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1
src/northbridge/intel/gm45/gm45.h
View File

@ -434,7 +434,6 @@ void gm45_late_init(stepping_t);
u32 decode_igd_memory_size(u32 gms);
u32 decode_igd_gtt_size(u32 gsm);
u32 decode_tseg_size(u8 esmramc);
uintptr_t smm_region_start(void);
void init_iommu(void);

16
src/northbridge/intel/gm45/northbridge.c
View File

@ -221,22 +221,6 @@ static const char *northbridge_acpi_name(const struct device *dev)
return NULL;
}
u32 northbridge_get_tseg_base(void)
{
return (u32)smm_region_start();
}
u32 northbridge_get_tseg_size(void)
{
struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
if (dev == NULL)
die("could not find pci 00:00.0!\n");
const u8 esmramc = pci_read_config8(dev, D0F0_ESMRAMC);
return decode_tseg_size(esmramc) << 10;
}
void northbridge_write_smram(u8 smram)
{
struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));

19
src/northbridge/intel/gm45/ram_calc.c
View File

@ -26,6 +26,7 @@
#include <cpu/x86/mtrr.h>
#include <cbmem.h>
#include <program_loading.h>
#include <cpu/intel/smm/gen1/smi.h>
#include "gm45.h"
/*
@ -83,7 +84,7 @@ u32 decode_tseg_size(u8 esmramc)
}
}
uintptr_t smm_region_start(void)
u32 northbridge_get_tseg_base(void)
{
const pci_devfn_t dev = PCI_DEV(0, 0, 0);
@ -106,13 +107,19 @@ uintptr_t smm_region_start(void)
return tor;
}
u32 northbridge_get_tseg_size(void)
{
const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC);
return decode_tseg_size(esmramc) << 10;
}
/* Depending of UMA and TSEG configuration, TSEG might start at any
* 1 MiB alignment. As this may cause very greedy MTRR setup, push
* CBMEM top downwards to 4 MiB boundary.
*/
void *cbmem_top(void)
{
uintptr_t top_of_ram = ALIGN_DOWN(smm_region_start(), 4*MiB);
uintptr_t top_of_ram = ALIGN_DOWN(northbridge_get_tseg_base(), 4*MiB);
return (void *) top_of_ram;
}
@ -135,12 +142,14 @@ 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);
/* Cache a 8 MiB region below the top of ram and 8 MiB above top of
/* Cache 8 MiB region below the top of ram and 2 MiB above top of
* ram to cover both cbmem as the TSEG region.
*/
top_of_ram = (uintptr_t)cbmem_top();
postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 16*MiB,
MTRR_TYPE_WRBACK);
postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB,
MTRR_TYPE_WRBACK);
postcar_frame_add_mtrr(&pcf, northbridge_get_tseg_base(),
northbridge_get_tseg_size(), MTRR_TYPE_WRBACK);
run_postcar_phase(&pcf);