diff options
Diffstat (limited to 'src/cpu/x86/smm/smihandler.c')
| -rw-r--r-- | src/cpu/x86/smm/smihandler.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/src/cpu/x86/smm/smihandler.c b/src/cpu/x86/smm/smihandler.c deleted file mode 100644 index 7946e90aea..0000000000 --- a/src/cpu/x86/smm/smihandler.c +++ /dev/null @@ -1,207 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ - -#include <arch/io.h> -#include <console/console.h> -#include <commonlib/region.h> -#include <cpu/x86/smm.h> -#include <cpu/x86/smi_deprecated.h> -#include <cpu/amd/amd64_save_state.h> -#include <cpu/intel/em64t100_save_state.h> -#include <cpu/intel/em64t101_save_state.h> -#include <cpu/x86/lapic.h> -#include <cpu/x86/lapic_def.h> -#include <cpu/x86/legacy_save_state.h> - -#if CONFIG(SPI_FLASH_SMM) -#include <spi-generic.h> -#endif - -static int do_driver_init = 1; - -typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore; - -/* SMI multiprocessing semaphore */ -static __attribute__((aligned(4))) volatile smi_semaphore smi_handler_status - = SMI_UNLOCKED; - -static int smi_obtain_lock(void) -{ - u8 ret = SMI_LOCKED; - - asm volatile ( - "movb %2, %%al\n" - "xchgb %%al, %1\n" - "movb %%al, %0\n" - : "=g" (ret), "=m" (smi_handler_status) - : "g" (SMI_LOCKED) - : "eax" - ); - - return (ret == SMI_UNLOCKED); -} - -static void smi_release_lock(void) -{ - asm volatile ( - "movb %1, %%al\n" - "xchgb %%al, %0\n" - : "=m" (smi_handler_status) - : "g" (SMI_UNLOCKED) - : "eax" - ); -} - -void io_trap_handler(int smif) -{ - /* If a handler function handled a given IO trap, it - * shall return a non-zero value - */ - printk(BIOS_DEBUG, "SMI function trap 0x%x: ", smif); - - if (southbridge_io_trap_handler(smif)) - return; - - if (mainboard_io_trap_handler(smif)) - return; - - printk(BIOS_DEBUG, "Unknown function\n"); -} - -/** - * @brief Set the EOS bit - */ -static void smi_set_eos(void) -{ - southbridge_smi_set_eos(); -} - -static u32 pci_orig; - -/** - * @brief Backup PCI address to make sure we do not mess up the OS - */ -static void smi_backup_pci_address(void) -{ - pci_orig = inl(0xcf8); -} - -/** - * @brief Restore PCI address previously backed up - */ -static void smi_restore_pci_address(void) -{ - outl(pci_orig, 0xcf8); -} - -static inline void *smm_save_state(uintptr_t base, int arch_offset, int node) -{ - base += SMM_SAVE_STATE_BEGIN(arch_offset) - (node * 0x400); - return (void *)base; -} - -/* This returns the SMM revision from the savestate of CPU0, - which is assumed to be the same for all CPU's. See the memory - map in smmhandler.S */ -uint32_t smm_revision(void) -{ - return *(uint32_t *)(SMM_BASE + SMM_ENTRY_OFFSET * 2 - SMM_REVISION_OFFSET_FROM_TOP); -} - -void *smm_get_save_state(int cpu) -{ - switch (smm_revision()) { - case 0x00030002: - case 0x00030007: - return smm_save_state(SMM_BASE, SMM_LEGACY_ARCH_OFFSET, cpu); - case 0x00030100: - return smm_save_state(SMM_BASE, SMM_EM64T100_ARCH_OFFSET, cpu); - case 0x00030101: /* SandyBridge, IvyBridge, and Haswell */ - return smm_save_state(SMM_BASE, SMM_EM64T101_ARCH_OFFSET, cpu); - case 0x00020064: - case 0x00030064: - return smm_save_state(SMM_BASE, SMM_AMD64_ARCH_OFFSET, cpu); - } - - return NULL; -} - -bool smm_region_overlaps_handler(const struct region *r) -{ - const struct region r_smm = {SMM_BASE, SMM_DEFAULT_SIZE}; - - return region_overlap(&r_smm, r); -} - -/** - * @brief Interrupt handler for SMI# - * - * @param smm_revision revision of the smm state save map - */ - -void smi_handler(void) -{ - unsigned int node; - - /* Are we ok to execute the handler? */ - if (!smi_obtain_lock()) { - /* For security reasons we don't release the other CPUs - * until the CPU with the lock is actually done - */ - while (smi_handler_status == SMI_LOCKED) { - asm volatile ( - ".byte 0xf3, 0x90\n" /* hint a CPU we are in - * spinlock (PAUSE - * instruction, REP NOP) - */ - ); - } - return; - } - - smi_backup_pci_address(); - - node = lapicid(); - - console_init(); - - printk(BIOS_SPEW, "\nSMI# #%d\n", node); - - /* Use smm_get_save_state() to see if the smm revision is supported */ - if (smm_get_save_state(node) == NULL) { - printk(BIOS_WARNING, "smm_revision: 0x%08x\n", smm_revision()); - printk(BIOS_WARNING, "SMI# not supported on your CPU\n"); - /* Don't release lock, so no further SMI will happen, - * if we don't handle it anyways. - */ - return; - } - - /* Allow drivers to initialize variables in SMM context. */ - if (do_driver_init) { -#if CONFIG(SPI_FLASH_SMM) - spi_init(); -#endif - do_driver_init = 0; - } - - /* Call chipset specific SMI handlers. */ - southbridge_smi_handler(); - - smi_restore_pci_address(); - - smi_release_lock(); - - /* De-assert SMI# signal to allow another SMI */ - smi_set_eos(); -} - -/* Provide a default implementation for all weak handlers so that relocation - * entries in the modules make sense. Without default implementations the - * weak relocations w/o a symbol have a 0 address which is where the modules - * are linked at. */ -int __weak mainboard_io_trap_handler(int smif) { return 0; } -void __weak southbridge_smi_handler(void) {} -void __weak mainboard_smi_gpi(u32 gpi_sts) {} -int __weak mainboard_smi_apmc(u8 data) { return 0; } -void __weak mainboard_smi_sleep(u8 slp_typ) {} -void __weak mainboard_smi_finalize(void) {} |