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/* 2005.6 by yhlu
* 2006.3 yhlu add copy data from CAR to ram
*/
#include <string.h>
#include <arch/stages.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cpu/amd/car.h>
#include <arch/acpi.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
#define PRINTK_IN_CAR 1
#if PRINTK_IN_CAR
#define print_car_debug(x) print_debug(x)
#else
#define print_car_debug(x)
#endif
extern char _car_data_start[];
extern char _car_data_end[];
static size_t car_data_size(void)
{
size_t car_size = &_car_data_end[0] - &_car_data_start[0];
return ALIGN(car_size, 64);
}
static size_t backup_size(void)
{
size_t car_size = &_car_data_end[0] - &_car_data_start[0];
return ALIGN(car_size + 1024, 1024);
}
static void memcpy_(void *d, const void *s, size_t len)
{
#if PRINTK_IN_CAR
printk(BIOS_SPEW, " Copy [%08x-%08x] to [%08x - %08x] ... ",
(u32) s, (u32) (s + len - 1), (u32) d, (u32) (d + len - 1));
#endif
memcpy(d, s, len);
}
static void memset_(void *d, int val, size_t len)
{
#if PRINTK_IN_CAR
printk(BIOS_SPEW, " Fill [%08x-%08x] ... ", (u32) d, (u32) (d + len - 1));
#endif
memset(d, val, len);
}
static void prepare_romstage_ramstack(void *resume_backup_memory)
{
size_t backup_top = backup_size();
print_car_debug("Prepare CAR migration and stack regions...");
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(void *resume_backup_memory)
{
size_t backup_top = backup_size();
print_car_debug("Prepare ramstage memory region... ");
if (resume_backup_memory) {
memcpy_(resume_backup_memory, (void *) CONFIG_RAMBASE, HIGH_MEMORY_SAVE - backup_top);
memset_((void*) CONFIG_RAMBASE, 0, HIGH_MEMORY_SAVE - backup_top);
} else {
memset_((void*)0, 0, CONFIG_RAMTOP - backup_top);
}
print_car_debug("Done\n");
}
/* Disable Erratum 343 Workaround, see RevGuide for Fam10h, Pub#41322 Rev 3.33 */
static void vErrata343(void)
{
#ifdef BU_CFG2_MSR
msr_t msr;
unsigned int uiMask = 0xFFFFFFF7;
msr = rdmsr(BU_CFG2_MSR);
msr.hi &= uiMask; // set bit 35 to 0
wrmsr(BU_CFG2_MSR, msr);
#endif
}
void post_cache_as_ram(void)
{
void *resume_backup_memory = NULL;
int s3resume = acpi_s3_resume_allowed() && acpi_is_wakeup_early();
if (s3resume) {
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
cbmem_recovery(s3resume);
resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
#endif
}
prepare_romstage_ramstack(resume_backup_memory);
/* from here don't store more data in CAR */
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_data_start[0], car_size);
print_car_debug("Done\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)
{
void *resume_backup_memory = NULL;
#if PRINTK_IN_CAR
printk(BIOS_DEBUG, "Top about %08x ... Done\n", (u32) &resume_backup_memory);
#endif
print_car_debug("Disabling cache as ram now\n");
disable_cache_as_ram_bsp();
disable_cache();
set_var_mtrr(0, 0x00000000, CONFIG_RAMTOP, MTRR_TYPE_WRBACK);
enable_cache();
if (acpi_s3_resume_allowed() && acpi_is_wakeup_early()) {
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
#endif
}
prepare_ramstage_region(resume_backup_memory);
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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