stages.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/*
 * This file contains entry/exit functions for each stage during coreboot
 * execution (bootblock entry and ramstage exit will depend on external
 * loading).
 *
 * Entry points must be placed at the location the previous stage jumps
 * to (the lowest address in the stage image). This is done by giving
 * stage_entry() its own section in .text and placing it first in the
 * linker script.
 */
 
#include <cbmem.h>
#include <arch/stages.h>
#include <cpu/power/spr.h>
 
void stage_entry(uintptr_t stage_arg)
{
#if ENV_RAMSTAGE
        uint64_t hrmor;
#endif
 
        if (!ENV_ROMSTAGE_OR_BEFORE)
                _cbmem_top_ptr = stage_arg;
 
#if ENV_RAMSTAGE
        hrmor = read_spr(SPR_HRMOR);
        asm volatile("sync; isync" ::: "memory");
        write_spr(SPR_HRMOR, 0);
        asm volatile("or 1,1,%0; slbia 7; sync; isync" :: "r"(hrmor) : "memory");
#endif
 
        main();
}