smihandler.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <types.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <device/pci_def.h>
#include <southbridge/intel/common/pmutil.h>
#include "i82801jx.h"
 
/* While we read PMBASE dynamically in case it changed, let's
 * initialize it with a sane value
 */
u16 pmbase = DEFAULT_PMBASE;
 
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) << 3));
        }
 
        /* IOTRAP(3) SMI function call (unused) */
        if (IOTRAP(3)) {
                printk(BIOS_DEBUG, "SMI function call not implemented\n");
                return;
        }
 
        /* IOTRAP(2) currently unused
         * IOTRAP(1) currently unused */
 
        /* IOTRAP(0) SMIC */
        if (IOTRAP(0)) {
                if (!(trap_cycle & (1 << 24))) { // It's a write
                        printk(BIOS_DEBUG, "SMI1 command\n");
                        data = RCBA32(0x1e18);
                        data &= mask;
                        // if (smi1)
                        //      southbridge_smi_command(data);
                        // return;
                }
                // Fall through to debug
        }
 
        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)
{
}