Atmosphere/exosphere/mc.c

#include <stdint.h>

#include "mmu.h"
#include "mc.h"

volatile security_carveout_t *get_carveout_by_id(unsigned int carveout) {
    if (CARVEOUT_ID_MIN <= carveout && carveout <= CARVEOUT_ID_MAX) {
         return (volatile security_carveout_t *)(MC_BASE + 0xC08ULL + 0x50 * (carveout - CARVEOUT_ID_MIN));
    }
    generic_panic();
    return NULL;
    switch (carveout) {
        case 4: /* Kernel carveout */
            return (volatile security_carveout_t *)(MC_BASE + 0xCF8ULL);
        case 5: /* Unused Kernel carveout */
            return (volatile security_carveout_t *)(MC_BASE + 0xD48ULL);
        default:
            generic_panic();
            return NULL;
    }
}

void configure_default_carveouts(void) {
    /* Configure Carveout 1 (UNUSED) */
    volatile security_carveout_t *carveout = get_carveout_by_id(1);
    carveout->paddr_low = 0;
    carveout->paddr_high = 0;
    carveout->size_big_pages = 0; 
    carveout->flags_0 = 0;
    carveout->flags_1 = 0;
    carveout->flags_2 = 0;
    carveout->flags_3 = 0;
    carveout->flags_4 = 0;
    carveout->flags_5 = 0;
    carveout->flags_6 = 0;
    carveout->flags_7 = 0;
    carveout->flags_8 = 0;
    carveout->flags_9 = 0;
    carveout->allowed_clients = 0x04000006;

    /* Configure Carveout 2 (GPU UCODE) */
    carveout = get_carveout_by_id(2);
    carveout->paddr_low = 0x80020000;
    carveout->paddr_high = 0;
    carveout->size_big_pages = 2; /* 0x40000 */
    carveout->flags_0 = 0;
    carveout->flags_1 = 0;
    carveout->flags_2 = 0x3000000;
    carveout->flags_3 = 0;
    carveout->flags_4 = 0x300;
    carveout->flags_5 = 0;
    carveout->flags_6 = 0;
    carveout->flags_7 = 0;
    carveout->flags_8 = 0;
    carveout->flags_9 = 0;
    carveout->allowed_clients = 0x440167E;
    
    /* Configure Carveout 3 (UNUSED GPU) */
    carveout = get_carveout_by_id(3);
    carveout->paddr_low = 0;
    carveout->paddr_high = 0;
    carveout->size_big_pages = 0;
    carveout->flags_0 = 0;
    carveout->flags_1 = 0;
    carveout->flags_2 = 0x3000000;
    carveout->flags_3 = 0;
    carveout->flags_4 = 0x300;
    carveout->flags_5 = 0;
    carveout->flags_6 = 0;
    carveout->flags_7 = 0;
    carveout->flags_8 = 0;
    carveout->flags_9 = 0;
    carveout->allowed_clients = 0x4401E7E;
    
    /* Configure default Kernel carveouts based on 2.0.0+. */
    
    /* Configure Carveout 4 (KERNEL_BUILTINS) */
    configure_kernel_carveout(5, 0x80060000, KERNEL_CARVEOUT_SIZE_MAX);
    
    /* Configure Carveout 5 (KERNEL_UNUSED) */
    configure_kernel_carveout(5, 0, 0);
}

void configure_kernel_carveout(unsigned int carveout_id, uint64_t address, uint64_t size) {
    if (carveout_id != 4 && carveout_id != 5) {
        generic_panic();
    }
    
    volatile security_carveout_t *carveout = get_carveout_by_id(carveout_id);
    carveout->paddr_low = (uint32_t)(address & 0xFFFFFFFF);
    carveout->paddr_high = (uint32_t)(address >> 32);
    carveout->size_big_pages = (uint32_t)(size >> 17);
    carveout->flags_0 = 0x70E3407F;
    carveout->flags_1 = 0x1A620880;
    carveout->flags_2 = 0x303C00;
    carveout->flags_3 = 0xCF0830BB;
    carveout->flags_4 = 0x3;
    carveout->flags_5 = 0;
    carveout->flags_6 = 0;
    carveout->flags_7 = 0;
    carveout->flags_8 = 0;
    carveout->flags_9 = 0;
    carveout->allowed_clients = 0x8B;
}