| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <types.h> |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <device/pci_def.h> |
| #include <southbridge/intel/common/pmutil.h> |
| #include "i82801gx.h" |
| |
| /* I945 */ |
| #define SMRAM 0x9d |
| #define D_OPEN (1 << 6) |
| #define D_CLS (1 << 5) |
| #define D_LCK (1 << 4) |
| #define G_SMRANE (1 << 3) |
| #define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0)) |
| |
| #include "nvs.h" |
| |
| /* While we read PMBASE dynamically in case it changed, let's initialize it with a sane value */ |
| u16 pmbase = DEFAULT_PMBASE; |
| u8 smm_initialized = 0; |
| |
| /* GNVS needs to be updated by an 0xEA PM Trap (B2) after it has been located by coreboot. */ |
| global_nvs_t *gnvs = (global_nvs_t *)0x0; |
| |
| void southbridge_update_gnvs(u8 apm_cnt, int *smm_done) |
| { |
| gnvs = *(global_nvs_t **)0x500; |
| *smm_done = 1; |
| } |
| |
| int southbridge_io_trap_handler(int smif) |
| { |
| switch (smif) { |
| case 0x32: |
| printk(BIOS_DEBUG, "OS Init\n"); |
| /* gnvs->smif: |
| * On success, the IO Trap Handler returns 0 |
| * On failure, the IO Trap Handler returns a value != 0 |
| */ |
| gnvs->smif = 0; |
| return 1; /* IO trap handled */ |
| } |
| |
| /* Not handled */ |
| return 0; |
| } |
| |
| void southbridge_smi_monitor(void) |
| { |
| #define IOTRAP(x) (trap_sts & (1 << x)) |
| u32 trap_sts, trap_cycle; |
| u32 data, mask = 0; |
| int i; |
| |
| trap_sts = RCBA32(0x1e00); // TRSR - Trap Status Register |
| RCBA32(0x1e00) = trap_sts; // Clear trap(s) in TRSR |
| |
| trap_cycle = RCBA32(0x1e10); |
| for (i = 16; i < 20; i++) { |
| if (trap_cycle & (1 << i)) |
| mask |= (0xff << ((i - 16) << 2)); |
| } |
| |
| |
| /* IOTRAP(3) SMI function call */ |
| if (IOTRAP(3)) { |
| if (gnvs && gnvs->smif) |
| io_trap_handler(gnvs->smif); // call function smif |
| return; |
| } |
| |
| /* IOTRAP(2) currently unused |
| * IOTRAP(1) currently unused */ |
| |
| /* IOTRAP(0) SMIC: currently unused */ |
| |
| printk(BIOS_DEBUG, " trapped io address = 0x%x\n", trap_cycle & 0xfffc); |
| for (i = 0; i < 4; i++) |
| if (IOTRAP(i)) |
| printk(BIOS_DEBUG, " TRAP = %d\n", i); |
| printk(BIOS_DEBUG, " AHBE = %x\n", (trap_cycle >> 16) & 0xf); |
| printk(BIOS_DEBUG, " MASK = 0x%08x\n", mask); |
| printk(BIOS_DEBUG, " read/write: %s\n", (trap_cycle & (1 << 24)) ? "read" : "write"); |
| |
| if (!(trap_cycle & (1 << 24))) { |
| /* Write Cycle */ |
| data = RCBA32(0x1e18); |
| printk(BIOS_DEBUG, " iotrap written data = 0x%08x\n", data); |
| } |
| #undef IOTRAP |
| } |
| |
| void southbridge_finalize_all(void) |
| { |
| } |