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Atmosphere/exosphere/src/coldboot_init.c

184 lines
8.2 KiB
C
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#include <string.h>
#include "utils.h"
#include "mmu.h"
#include "memory_map.h"
#include "arm.h"
#include "package2.h"
#include "timers.h"
#include "exocfg.h"
#undef MAILBOX_NX_BOOTLOADER_BASE
#undef TIMERS_BASE
#define MAILBOX_NX_BOOTLOADER_BASE (MMIO_GET_DEVICE_PA(MMIO_DEVID_NXBOOTLOADER_MAILBOX))
#define TIMERS_BASE (MMIO_GET_DEVICE_PA(MMIO_DEVID_TMRs_WDTs))
extern const uint8_t __start_cold[];
static void identity_map_all_mappings(uintptr_t *mmu_l1_tbl, uintptr_t *mmu_l3_tbl) {
static const uintptr_t addrs[] = { TUPLE_FOLD_LEFT_0(EVAL(IDENTIY_MAPPING_ID_MAX), _MMAPID, COMMA) };
static const size_t sizes[] = { TUPLE_FOLD_LEFT_1(EVAL(IDENTIY_MAPPING_ID_MAX), _MMAPID, COMMA) };
static const uint64_t attribs[] = { TUPLE_FOLD_LEFT_2(EVAL(IDENTIY_MAPPING_ID_MAX), _MMAPID, COMMA) };
static const uint64_t is_block[] = { TUPLE_FOLD_LEFT_3(EVAL(IDENTIY_MAPPING_ID_MAX), _MMAPID, COMMA) };
for(size_t i = 0; i < IDENTIY_MAPPING_ID_MAX; i++) {
identity_map_mapping(mmu_l1_tbl, mmu_l3_tbl, addrs[i], sizes[i], attribs[i], is_block[i]);
}
}
static void mmio_map_all_devices(uintptr_t *mmu_l3_tbl) {
static const uintptr_t pas[] = { TUPLE_FOLD_LEFT_0(EVAL(MMIO_DEVID_MAX), _MMAPDEV, COMMA) };
static const size_t sizes[] = { TUPLE_FOLD_LEFT_1(EVAL(MMIO_DEVID_MAX), _MMAPDEV, COMMA) };
static const bool is_secure[] = { TUPLE_FOLD_LEFT_2(EVAL(MMIO_DEVID_MAX), _MMAPDEV, COMMA) };
for(size_t i = 0, offset = 0; i < MMIO_DEVID_MAX; i++) {
mmio_map_device(mmu_l3_tbl, MMIO_BASE + offset, pas[i], sizes[i], is_secure[i]);
offset += sizes[i];
offset += 0x1000;
}
}
static void lp0_entry_map_all_ram_segments(uintptr_t *mmu_l3_tbl) {
static const uintptr_t pas[] = { TUPLE_FOLD_LEFT_0(EVAL(LP0_ENTRY_RAM_SEGMENT_ID_MAX), _MMAPLP0ES, COMMA) };
static const size_t sizes[] = { TUPLE_FOLD_LEFT_1(EVAL(LP0_ENTRY_RAM_SEGMENT_ID_MAX), _MMAPLP0ES, COMMA) };
static const uint64_t attribs[] = { TUPLE_FOLD_LEFT_2(EVAL(LP0_ENTRY_RAM_SEGMENT_ID_MAX), _MMAPLP0ES, COMMA) };
for(size_t i = 0, offset = 0; i < LP0_ENTRY_RAM_SEGMENT_ID_MAX; i++) {
lp0_entry_map_ram_segment(mmu_l3_tbl, LP0_ENTRY_RAM_SEGMENT_BASE + offset, pas[i], sizes[i], attribs[i]);
offset += 0x10000;
}
}
static void warmboot_map_all_ram_segments(uintptr_t *mmu_l3_tbl) {
static const uintptr_t pas[] = { TUPLE_FOLD_LEFT_0(EVAL(WARMBOOT_RAM_SEGMENT_ID_MAX), _MMAPWBS, COMMA) };
static const size_t sizes[] = { TUPLE_FOLD_LEFT_1(EVAL(WARMBOOT_RAM_SEGMENT_ID_MAX), _MMAPWBS, COMMA) };
static const uint64_t attribs[] = { TUPLE_FOLD_LEFT_2(EVAL(WARMBOOT_RAM_SEGMENT_ID_MAX), _MMAPWBS, COMMA) };
for(size_t i = 0, offset = 0; i < WARMBOOT_RAM_SEGMENT_ID_MAX; i++) {
warmboot_map_ram_segment(mmu_l3_tbl, WARMBOOT_RAM_SEGMENT_BASE + offset, pas[i], sizes[i], attribs[i]);
offset += sizes[i];
}
}
static void tzram_map_all_segments(uintptr_t *mmu_l3_tbl) {
static const uintptr_t offs[] = { TUPLE_FOLD_LEFT_0(EVAL(TZRAM_SEGMENT_ID_MAX), _MMAPTZS, COMMA) };
static const size_t sizes[] = { TUPLE_FOLD_LEFT_1(EVAL(TZRAM_SEGMENT_ID_MAX), _MMAPTZS, COMMA) };
static const size_t increments[] = { TUPLE_FOLD_LEFT_2(EVAL(TZRAM_SEGMENT_ID_MAX), _MMAPTZS, COMMA) };
static const bool is_executable[] = { TUPLE_FOLD_LEFT_3(EVAL(TZRAM_SEGMENT_ID_MAX), _MMAPTZS, COMMA) };
for(size_t i = 0, offset = 0; i < TZRAM_SEGMENT_ID_MAX; i++) {
tzram_map_segment(mmu_l3_tbl, TZRAM_SEGMENT_BASE + offset, 0x7C010000ull + offs[i], sizes[i], is_executable[i]);
offset += increments[i];
}
}
static void configure_ttbls(void) {
uintptr_t *mmu_l1_tbl = (uintptr_t *)(TZRAM_GET_SEGMENT_PA(TZRAM_SEGEMENT_ID_SECMON_EVT) + 0x800 - 64);
uintptr_t *mmu_l2_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_L2_TRANSLATION_TABLE);
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_init_table(mmu_l1_tbl, 64); /* 33-bit address space */
mmu_init_table(mmu_l2_tbl, 4096);
/*
Nintendo uses the same L3 table for everything, but they make sure
nothing clashes.
*/
mmu_init_table(mmu_l3_tbl, 4096);
mmu_map_table(1, mmu_l1_tbl, 0x40000000, mmu_l2_tbl, 0);
mmu_map_table(1, mmu_l1_tbl, 0x1C0000000, mmu_l2_tbl, 0);
mmu_map_table(2, mmu_l2_tbl, 0x40000000, mmu_l3_tbl, 0);
mmu_map_table(2, mmu_l2_tbl, 0x7C000000, mmu_l3_tbl, 0);
mmu_map_table(2, mmu_l2_tbl, 0x1F0000000ull, mmu_l3_tbl, 0);
identity_map_all_mappings(mmu_l1_tbl, mmu_l3_tbl);
mmio_map_all_devices(mmu_l3_tbl);
lp0_entry_map_all_ram_segments(mmu_l3_tbl);
warmboot_map_all_ram_segments(mmu_l3_tbl);
tzram_map_all_segments(mmu_l3_tbl);
}
static void translate_func_list(coldboot_crt0_reloc_list_t *reloc_list, boot_func_list_t *func_list, bool in_tzram) {
coldboot_crt0_reloc_t *warmboot_crt0_reloc = &reloc_list->relocs[0];
coldboot_crt0_reloc_t *main_reloc = &reloc_list->relocs[reloc_list->nb_relocs_pre_mmu_init];
uintptr_t main_pa;
if (in_tzram) {
/* The main segment immediately follows the warmboot crt0 in TZRAM, in the same page. */
main_pa = (uintptr_t)warmboot_crt0_reloc->vma | ((uintptr_t)main_reloc->vma & 0xFFF);
} else {
main_pa = reloc_list->reloc_base + main_reloc->reloc_offset;
}
for(size_t i = 0; i < func_list->nb_funcs; i++) {
if(func_list->addrs[i] >= 0x1F0000000ull) {
func_list->addrs[i] = main_pa + func_list->addrs[i] - (uintptr_t)main_reloc->vma;
}
}
}
static void do_relocation(const coldboot_crt0_reloc_list_t *reloc_list, size_t index) {
uint64_t *p_vma = (uint64_t *)reloc_list->relocs[index].vma;
const uint64_t *p_lma = (const uint64_t *)(reloc_list->reloc_base + reloc_list->relocs[index].reloc_offset);
size_t size = reloc_list->relocs[index].end_vma - reloc_list->relocs[index].vma;
for(size_t i = 0; i < size / 8; i++) {
p_vma[i] = reloc_list->relocs[index].reloc_offset != 0 ? p_lma[i] : 0;
}
}
uintptr_t get_coldboot_crt0_stack_address(void) {
return TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_CORE3_STACK) + 0x800;
}
void coldboot_init(coldboot_crt0_reloc_list_t *reloc_list, boot_func_list_t *func_list, boot_func_list_t *func_list_warmboot) {
MAILBOX_NX_SECMON_BOOT_TIME = TIMERUS_CNTR_1US_0;
boot_func_list_t func_copy = *func_list;
/* Custom approach */
reloc_list->reloc_base = (uintptr_t)__start_cold;
translate_func_list(reloc_list, func_list, false);
/*
From https://events.static.linuxfound.org/sites/events/files/slides/slides_17.pdf :
Caches may write back dirty lines at any time:
- To make space for new allocations
- Even if MMU is off
- Even if Cacheable accesses are disabled (caches are never 'off')
It should be fine to clear that here and not before.
*/
func_list->funcs.flush_dcache_all();
func_list->funcs.invalidate_icache_all();
/* TODO: Set NX BOOTLOADER clock time field */
/* This at least copies .warm_crt0 to its VMA. */
for(size_t i = 0; i < reloc_list->nb_relocs_pre_mmu_init; i++) {
do_relocation(reloc_list, i);
}
/* At this point, we can (and will) access functions located in .warm_crt0 */
/* Set target firmware. */
func_list->target_firmware = exosphere_get_target_firmware_physical();
/* Initialize DMA controllers, and write to AHB_GIZMO_TZRAM. */
/* TZRAM accesses should work normally after this point. */
func_list->funcs.init_dma_controllers(func_list->target_firmware);
configure_ttbls();
func_list->funcs.set_memory_registers_enable_mmu();
/* Copy or clear the remaining sections */
for(size_t i = 0; i < reloc_list->nb_relocs_post_mmu_init; i++) {
do_relocation(reloc_list, reloc_list->nb_relocs_pre_mmu_init + i);
}
func_list->funcs.flush_dcache_all();
func_list->funcs.invalidate_icache_all();
/* At this point we can access all the mapped segments (all other functions, data...) normally */
*func_list_warmboot = func_copy;
translate_func_list(reloc_list, func_list_warmboot, true);
}
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