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/* SPDX-License-Identifier: GPL-2.0-only */
#define __SIMPLE_DEVICE__
#include <arch/romstage.h>
#include <commonlib/helpers.h>
#include <device/pci_ops.h>
#include <device/device.h>
#include <device/pci_def.h>
#include <console/console.h>
#include <cbmem.h>
#include <northbridge/intel/pineview/pineview.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <cpu/intel/smm_reloc.h>
#include <stdint.h>
/** Decodes used Graphics Mode Select (GMS) to kilobytes. */
u32 decode_igd_memory_size(const u32 gms)
{
const u32 gmssize[] = {0, 1, 4, 8, 16, 32, 48, 64, 128, 256};
if (gms > 9) {
printk(BIOS_DEBUG, "Bad Graphics Mode Select (GMS) value.\n");
return 0;
}
return gmssize[gms] << 10;
}
/** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */
u32 decode_igd_gtt_size(const u32 gsm)
{
const u8 gsmsize[] = {0, 1, 0, 0};
if (gsm > 3) {
printk(BIOS_DEBUG, "Bad Graphics Stolen Memory (GSM) value.\n");
return 0;
}
return (u32)(gsmsize[gsm] << 10);
}
/** Decodes used TSEG size to bytes. */
static u32 decode_tseg_size(const u32 esmramc)
{
if (!(esmramc & 1))
return 0;
switch ((esmramc >> 1) & 3) {
case 0:
return 1 * MiB;
case 1:
return 2 * MiB;
case 2:
return 8 * MiB;
case 3:
default:
die("Bad TSEG setting.\n");
}
}
static size_t northbridge_get_tseg_size(void)
{
const u8 esmramc = pci_read_config8(HOST_BRIDGE, ESMRAMC);
return decode_tseg_size(esmramc);
}
static uintptr_t northbridge_get_tseg_base(void)
{
return pci_read_config32(HOST_BRIDGE, TSEG);
}
/*
* 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_chipset(void)
{
return (void *) ALIGN_DOWN(northbridge_get_tseg_base(), 4 * MiB);
}
void smm_region(uintptr_t *start, size_t *size)
{
*start = northbridge_get_tseg_base();
*size = northbridge_get_tseg_size();
}
void fill_postcar_frame(struct postcar_frame *pcf)
{
uintptr_t top_of_ram;
/*
* Cache 8 MiB region below the top of RAM and 2 MiB above top of RAM to cover both
* CBMEM and the TSEG region.
*/
top_of_ram = (uintptr_t)cbmem_top();
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);
}
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