smi_handler.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <amdblocks/acpimmio.h>
#include <console/console.h>
#include <amdblocks/smi.h>
#include <amdblocks/smm.h>
#include <cpu/x86/smm.h>
#include <soc/smi.h>
 
__weak void mainboard_handle_smi(int event)
{
        printk(BIOS_WARNING, "SMI event %d is missing handler\n", event);
}
 
static void process_smi_sources(uint32_t reg)
{
        const uint32_t status = smi_read32(reg);
        int bit_zero = 32 / sizeof(uint32_t) * (reg - SMI_REG_SMISTS0);
        void (*source_handler)(void);
        int i;
 
        for (i = 0 ; i < 32 ; i++) {
                if (status & (1 << i)) {
                        source_handler = get_smi_source_handler(i + bit_zero);
                        if (source_handler)
                                source_handler();
                        else if (reg != SMI_REG_SMISTS0 || (status & GEVENT_MASK) == 0)
                                mainboard_handle_smi(i + bit_zero);
                }
        }
 
        if (reg == SMI_REG_SMISTS0)
                if (status & GEVENT_MASK)
                        /* Gevent[23:0] are assumed to be mainboard-specific */
                        mainboard_smi_gpi(status & GEVENT_MASK);
 
        /* Clear all events in this register */
        smi_write32(reg, status);
}
 
void southbridge_smi_handler(void)
{
        const uint16_t smi_src = smi_read16(SMI_REG_POINTER);
 
        if (smi_src & SMI_STATUS_SRC_SCI) {
                printk(BIOS_WARNING, "Ignoring SCI SMI: %#x\n", smi_read32(SMI_SCI_STATUS));
 
                /* Clear events to prevent re-entering SMI if event isn't handled */
                clear_smi_sci_status();
        }
        if (smi_src & SMI_STATUS_SRC_0)
                process_smi_sources(SMI_REG_SMISTS0);
        if (smi_src & SMI_STATUS_SRC_1)
                process_smi_sources(SMI_REG_SMISTS1);
        if (smi_src & SMI_STATUS_SRC_2)
                process_smi_sources(SMI_REG_SMISTS2);
        if (smi_src & SMI_STATUS_SRC_3)
                process_smi_sources(SMI_REG_SMISTS3);
        if (smi_src & SMI_STATUS_SRC_4)
                process_smi_sources(SMI_REG_SMISTS4);
}