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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>,
* Raptor Engineering
* Copyright (C) 2012 ChromeOS Authors
* 2005.6 by yhlu
* 2006.3 yhlu add copy data from CAR to ram
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <string.h>
#include <arch/stages.h>
#include <arch/early_variables.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cpu/amd/car.h>
#include <arch/acpi.h>
#include <romstage_handoff.h>
#include "cbmem.h"
#include "cpu/amd/car/disable_cache_as_ram.c"
#if CONFIG_RAMTOP <= 0x100000
#error "You need to set CONFIG_RAMTOP greater than 1M"
#endif
#if IS_ENABLED(CONFIG_DEBUG_CAR)
#define print_car_debug(format, arg...) printk(BIOS_DEBUG, "%s: " format, __func__, ##arg)
#else
#define print_car_debug(format, arg...)
#endif
static size_t backup_size(void)
{
size_t car_size = car_data_size();
return ALIGN(car_size + 1024, 1024);
}
static void memcpy_(void *d, const void *s, size_t len)
{
print_car_debug(" Copy [%08x-%08x] to [%08x - %08x] ...",
(uint32_t) s, (uint32_t) (s + len - 1), (uint32_t) d, (uint32_t) (d + len - 1));
memcpy(d, s, len);
}
static void memset_(void *d, int val, size_t len)
{
print_car_debug(" Fill [%08x-%08x] ...", (uint32_t) d, (uint32_t) (d + len - 1));
memset(d, val, len);
}
static int memcmp_(void *d, const void *s, size_t len)
{
print_car_debug(" Compare [%08x-%08x] with [%08x - %08x] ...",
(uint32_t) s, (uint32_t) (s + len - 1), (uint32_t) d, (uint32_t) (d + len - 1));
return memcmp(d, s, len);
}
static void prepare_romstage_ramstack(int s3resume)
{
size_t backup_top = backup_size();
print_car_debug("Prepare CAR migration and stack regions...");
if (s3resume) {
void *resume_backup_memory = acpi_backup_container(CONFIG_RAMBASE, HIGH_MEMORY_SAVE);
if (resume_backup_memory)
memcpy_(resume_backup_memory + HIGH_MEMORY_SAVE - backup_top,
(void *)(CONFIG_RAMTOP - backup_top), backup_top);
}
memset_((void *)(CONFIG_RAMTOP - backup_top), 0, backup_top);
print_car_debug(" Done\n");
}
static void prepare_ramstage_region(int s3resume)
{
size_t backup_top = backup_size();
print_car_debug("Prepare ramstage memory region...");
if (s3resume) {
void *resume_backup_memory = acpi_backup_container(CONFIG_RAMBASE, HIGH_MEMORY_SAVE);
if (resume_backup_memory)
memcpy_(resume_backup_memory, (void *) CONFIG_RAMBASE,
HIGH_MEMORY_SAVE - backup_top);
}
print_car_debug(" Done\n");
}
/* Disable Erratum 343 Workaround, see RevGuide for Fam10h, Pub#41322 Rev 3.33
* and RevGuide for Fam12h, Pub#44739 Rev 3.10
*/
static void vErrata343(void)
{
msr_t msr;
unsigned int uiMask = 0xFFFFFFF7;
msr = rdmsr(BU_CFG2_MSR);
msr.hi &= uiMask; // IcDisSpecTlbWr (bit 35) = 0
wrmsr(BU_CFG2_MSR, msr);
}
void post_cache_as_ram(void)
{
uint32_t family = amd_fam1x_cpu_family();
/* Verify that the BSP didn't overrun the lower stack
* boundary during romstage execution
*/
volatile uint32_t *lower_stack_boundary;
lower_stack_boundary = (void *)((CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE) - CONFIG_DCACHE_BSP_STACK_SIZE);
if ((*lower_stack_boundary) != 0xdeadbeef)
printk(BIOS_WARNING, "BSP overran lower stack boundary. Undefined behaviour may result!\n");
int s3resume = acpi_is_wakeup_s3();
/* Boards with EARLY_CBMEM_INIT need to do this in cache_as_ram_main().
*/
if (s3resume && !IS_ENABLED(CONFIG_EARLY_CBMEM_INIT))
cbmem_recovery(s3resume);
prepare_romstage_ramstack(s3resume);
romstage_handoff_init(s3resume);
/* from here don't store more data in CAR */
if (family >= 0x1f && family <= 0x3f) {
/* Family 10h and 12h, 11h until shown otherwise */
vErrata343();
}
size_t car_size = car_data_size();
void *migrated_car = (void *)(CONFIG_RAMTOP - car_size);
print_car_debug("Copying data from cache to RAM...");
memcpy_(migrated_car, _car_relocatable_data_start, car_size);
print_car_debug(" Done\n");
print_car_debug("Verifying data integrity in RAM...");
if (memcmp_(migrated_car, _car_relocatable_data_start, car_size) == 0)
print_car_debug(" Done\n");
else
print_car_debug(" FAILED\n");
/* New stack grows right below migrated_car. */
print_car_debug("Switching to use RAM as stack...");
cache_as_ram_switch_stack(migrated_car);
/* We do not come back. */
}
void cache_as_ram_new_stack (void)
{
print_car_debug("Disabling cache as RAM now\n");
disable_cache_as_ram_bsp();
disable_cache();
/* Enable cached access to RAM in the range 0M to CACHE_TMP_RAMTOP */
set_var_mtrr(0, 0x00000000, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
enable_cache();
prepare_ramstage_region(acpi_is_wakeup_s3());
set_sysinfo_in_ram(1); // So other core0 could start to train mem
/*copy and execute ramstage */
copy_and_run();
/* We will not return */
print_car_debug("should not be here -\n");
}
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