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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef CPU_X86_SMM_H
#define CPU_X86_SMM_H
#include <arch/cpu.h>
#include <commonlib/region.h>
#include <types.h>
#define SMM_DEFAULT_BASE 0x30000
#define SMM_DEFAULT_SIZE 0x10000
/* used only by C programs so far */
#define SMM_BASE 0xa0000
#define SMM_ENTRY_OFFSET 0x8000
#define SMM_SAVE_STATE_BEGIN(x) (SMM_ENTRY_OFFSET + (x))
#define APM_CNT 0xb2
#define APM_CNT_NOOP_SMI 0x00
#define APM_CNT_ACPI_DISABLE 0x1e
#define APM_CNT_ACPI_ENABLE 0xe1
#define APM_CNT_ROUTE_ALL_XHCI 0xca
#define APM_CNT_FINALIZE 0xcb
#define APM_CNT_LEGACY 0xcc
#define APM_CNT_MBI_UPDATE 0xeb
#define APM_CNT_SMMINFO 0xec
#define APM_CNT_SMMSTORE 0xed
#define APM_CNT_ELOG_GSMI 0xef
#define APM_STS 0xb3
/* Send cmd to APM_CNT with HAVE_SMI_HANDLER checking. */
int apm_control(u8 cmd);
u8 apm_get_apmc(void);
void io_trap_handler(int smif);
int southbridge_io_trap_handler(int smif);
int mainboard_io_trap_handler(int smif);
void southbridge_smi_set_eos(void);
void global_smi_enable(void);
void global_smi_enable_no_pwrbtn(void);
void cpu_smi_handler(void);
void northbridge_smi_handler(void);
void southbridge_smi_handler(void);
void mainboard_smi_gpi(u32 gpi_sts);
int mainboard_smi_apmc(u8 data);
void mainboard_smi_sleep(u8 slp_typ);
void mainboard_smi_finalize(void);
/* This is the SMM handler. */
extern unsigned char _binary_smm_start[];
extern unsigned char _binary_smm_end[];
struct smm_runtime {
u32 smbase;
u32 smm_size;
u32 save_state_size;
u32 num_cpus;
u32 gnvs_ptr;
u32 cbmemc_size;
void *cbmemc;
uintptr_t save_state_top[CONFIG_MAX_CPUS];
} __packed;
struct smm_module_params {
size_t cpu;
/* A canary value that has been placed at the end of the stack.
* If (uintptr_t)canary != *canary then a stack overflow has occurred.
*/
const uintptr_t *canary;
};
/* These parameters are used by the SMM stub code. A pointer to the params
* is also passed to the C-base handler. */
struct smm_stub_params {
u32 stack_size;
u32 stack_top;
u32 c_handler;
u32 fxsave_area;
u32 fxsave_area_size;
/* The apic_id_to_cpu provides a mapping from APIC id to CPU number.
* The CPU number is indicated by the index into the array by matching
* the default APIC id and value at the index. The stub loader
* initializes this array with a 1:1 mapping. If the APIC ids are not
* contiguous like the 1:1 mapping it is up to the caller of the stub
* loader to adjust this mapping. */
u16 apic_id_to_cpu[CONFIG_MAX_CPUS];
/* STM's 32bit entry into SMI handler */
u32 start32_offset;
} __packed;
/* smm_handler_t is called with arg of smm_module_params pointer. */
typedef asmlinkage void (*smm_handler_t)(void *);
/* SMM Runtime helpers. */
#if ENV_SMM
extern struct global_nvs *gnvs;
#endif
/* Entry point for SMM modules. */
asmlinkage void smm_handler_start(void *params);
/* Retrieve SMM save state for a given CPU. WARNING: This does not take into
* account CPUs which are configured to not save their state to RAM. */
void *smm_get_save_state(int cpu);
/* Returns true if the region overlaps with the SMM */
bool smm_region_overlaps_handler(const struct region *r);
/* Returns true if the memory pointed to overlaps with SMM reserved memory. */
static inline bool smm_points_to_smram(const void *ptr, const size_t len)
{
const struct region r = {(uintptr_t)ptr, len};
return smm_region_overlaps_handler(&r);
}
/* SMM Module Loading API */
/* The smm_loader_params structure provides direction to the SMM loader:
* - num_cpus - number of concurrent cpus in handler needing stack
* optional for setting up relocation handler.
* - per_cpu_save_state_size - the SMM save state size per cpu
* - num_concurrent_save_states - number of concurrent cpus needing save state
* space
* - handler - optional handler to call. Only used during SMM relocation setup.
* - runtime - this field is a result only. The SMM runtime location is filled
* into this field so the code doing the loading can manipulate the
* runtime's assumptions. e.g. updating the APIC id to CPU map to
* handle sparse APIC id space.
*/
struct smm_loader_params {
size_t num_cpus;
size_t real_cpu_save_state_size;
size_t per_cpu_save_state_size;
size_t num_concurrent_save_states;
smm_handler_t handler;
struct smm_stub_params *stub_params;
};
/* All of these return 0 on success, < 0 on failure. */
int smm_setup_stack(const uintptr_t perm_smbase, const size_t perm_smram_size,
const unsigned int total_cpus, const size_t stack_size);
int smm_setup_relocation_handler(struct smm_loader_params *params);
int smm_load_module(uintptr_t smram_base, size_t smram_size, struct smm_loader_params *params);
u32 smm_get_cpu_smbase(unsigned int cpu_num);
/* Backup and restore default SMM region. */
void *backup_default_smm_area(void);
void restore_default_smm_area(void *smm_save_area);
/*
* Fills in the arguments for the entire SMM region covered by chipset
* protections. e.g. TSEG.
*/
void smm_region(uintptr_t *start, size_t *size);
enum {
/* SMM handler area. */
SMM_SUBREGION_HANDLER,
/* SMM cache region. */
SMM_SUBREGION_CACHE,
/* Chipset specific area. */
SMM_SUBREGION_CHIPSET,
/* Total sub regions supported. */
SMM_SUBREGION_NUM,
};
/* Fills in the start and size for the requested SMM subregion. Returns
* 0 on success, < 0 on failure. */
int smm_subregion(int sub, uintptr_t *start, size_t *size);
/* Print the SMM memory layout on console. */
void smm_list_regions(void);
#define SMM_REVISION_OFFSET_FROM_TOP (0x8000 - 0x7efc)
/* Return the SMM save state revision. The revision can be fetched from the smm savestate
which is always at the same offset downward from the top of the save state. */
uint32_t smm_revision(void);
/* Returns the PM ACPI SMI port. On Intel systems this typically not configurable (APM_CNT, 0xb2).
On AMD systems it is sometimes configurable. */
uint16_t pm_acpi_smi_cmd_port(void);
#endif /* CPU_X86_SMM_H */
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