1 files changed, 58 insertions, 0 deletions
diff --git a/src/mainboard/emulation/qemu-q35/cpu.c b/src/mainboard/emulation/qemu-q35/cpu.c
new file mode 100644
index 0000000000..b30d7298ec
--- /dev/null
+++ b/src/mainboard/emulation/qemu-q35/cpu.c
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <cpu/x86/mp.h>
+#include <stdint.h>
+#include <cpu/intel/smm_reloc.h>
+#include <cpu/amd/amd64_save_state.h>
+#include <mainboard/emulation/qemu-i440fx/fw_cfg.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);
+
+	/* 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%lx 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.
+ */
+static void relocation_handler(int cpu, uintptr_t curr_smbase,
+			       uintptr_t staggered_smbase)
+{
+	/* The em64t101 save state is sufficiently compatible with older
+	   save states with regards of smbase, smm_revision. */
+	amd64_smm_state_save_area_t *save_state;
+	u32 smbase = staggered_smbase;
+
+	save_state = (void *)(curr_smbase + SMM_DEFAULT_SIZE - sizeof(*save_state));
+	save_state->smbase = smbase;
+
+	printk(BIOS_DEBUG, "In relocation handler: cpu %d\n", cpu);
+	printk(BIOS_DEBUG, "SMM revision: 0x%08x\n", save_state->smm_revision);
+	printk(BIOS_DEBUG, "New SMBASE=0x%08x\n", smbase);
+}
+
+static void post_mp_init(void)
+{
+	/* 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,
+};