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/* SPDX-License-Identifier: GPL-2.0-only */
#include <commonlib/helpers.h>
#include <console/console.h>
#include <cpu/amd/amd64_save_state.h>
#include <cpu/intel/smm_reloc.h>
#include <cpu/x86/legacy_save_state.h>
#include <cpu/x86/mp.h>
#include <cpu/x86/smm.h>
#include <mainboard/emulation/qemu-i440fx/fw_cfg.h>
#include <stddef.h>
#include <stdint.h>
static void get_smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
size_t *smm_save_state_size)
{
printk(BIOS_DEBUG, "Setting up SMI for CPU\n");
smm_subregion(SMM_SUBREGION_HANDLER, perm_smbase, perm_smsize);
smm_open();
/* FIXME: on X86_64 the save state size is smaller than the size of the SMM stub */
*smm_save_state_size = sizeof(amd64_smm_state_save_area_t);
printk(BIOS_DEBUG, "Save state size: 0x%zx bytes\n", *smm_save_state_size);
}
/*
* The relocation work is actually performed in SMM context, but the code
* resides in the ramstage module. This occurs by trampolining from the default
* SMRAM entry point to here.
*/
union __packed save_state {
amd64_smm_state_save_area_t amd64;
struct {
char _reserved[sizeof(amd64_smm_state_save_area_t)
- sizeof(legacy_smm_state_save_area_t)];
legacy_smm_state_save_area_t legacy;
};
};
_Static_assert(sizeof(union save_state) == sizeof(amd64_smm_state_save_area_t),
"Incorrect save state union size");
_Static_assert(offsetof(union save_state, amd64.smm_revision)
== offsetof(union save_state, legacy.smm_revision),
"Incompatible SMM save state revision offset");
static void relocation_handler(int cpu, uintptr_t curr_smbase,
uintptr_t staggered_smbase)
{
union save_state *save_state =
(void *)(curr_smbase + SMM_DEFAULT_SIZE - sizeof(*save_state));
u32 smbase = staggered_smbase;
/* The SMM save state revision is always at a compatible offset */
const u32 revision = save_state->legacy.smm_revision;
switch (revision) {
case 0x00020000:
save_state->legacy.smbase = smbase;
break;
case 0x00020064:
save_state->amd64.smbase = smbase;
break;
default:
printk(BIOS_ERR, "Unknown SMM revision 0x%x, not relocating SMM\n", revision);
return;
};
printk(BIOS_DEBUG, "In relocation handler: cpu %d\n", cpu);
printk(BIOS_DEBUG, "SMM revision: 0x%08x\n", revision);
printk(BIOS_DEBUG, "New SMBASE=0x%08x\n", smbase);
}
static void post_mp_init(void)
{
/* Limit access to SMRAM to SMM module. */
smm_close();
/* Now that all APs have been relocated as well as the BSP let SMIs start flowing. */
global_smi_enable();
/* Lock down the SMRAM space. */
smm_lock();
}
const struct mp_ops mp_ops_with_smm = {
.get_cpu_count = fw_cfg_max_cpus,
.get_smm_info = get_smm_info,
.pre_mp_smm_init = smm_southbridge_clear_state,
.relocation_handler = relocation_handler,
.post_mp_init = post_mp_init,
};
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