Atmosphere/exosphere/coldboot_main.c

#include <string.h>
#include "utils.h"
#include "mmu.h"
#include "memory_map.h"

extern void (*__fini_array_start[])(void);
extern void (*__fini_array_end[])(void);
extern void _fini(void);

extern uint8_t __pk2ldr_start__[], __pk2ldr_end__[];

extern void __jump_to_lower_el(uint64_t arg, uintptr_t ep, unsigned int el);

void coldboot_main(void);

/* Needs to be called for EL3->EL3 chainloading (and only in that case). TODO: use it */
static void __libc_fini_array(void) __attribute__((used)) {
    for (size_t i = __fini_array_end - __fini_array_start; i > 0; i--)
        __fini_array_start[i - 1]();
    _fini(); /* FIXME: do we have this gcc-provided symbol if we build with -nostartfiles? */
}

void coldboot_main(void) {
    uintptr_t *mmu_l3_table = (uintptr_t *)tzram_get_segment_address(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
    void *pk2ldr = (void *)tzram_get_segment_address(TZRAM_SEGMENT_ID_PK2LDR); 

    /* Clear and unmap pk2ldr (which is reused as exception entry stacks) */
    memset(pk2ldr, 0, __pk2ldr_end__ - __pk2ldr_start__);
    mmu_unmap_range(mmu_l3_table, pk2ldr, __pk2ldr_end__ - __pk2ldr_start__);
    tlb_invalidate_all_inner_shareable();

    /* TODO: stuff & jump to lower EL */
}