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Code Issues Releases Activity

Finish writing coldboot_main

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This commit is contained in:
TuxSH 2018-03-01 01:40:09 +01:00
parent 19dda5ed48
commit 78b9698260
3 changed files with 27 additions and 6 deletions
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10
exosphere/src/coldboot_main.c
View file

@ -3,20 +3,26 @@
#include "mmu.h"
#include "memory_map.h"
#include "arm.h"
#include "cpu_context.h"
extern uint8_t __pk2ldr_start__[], __pk2ldr_end__[];
/* start.s */
void __jump_to_lower_el(uint64_t arg, uintptr_t ep, unsigned int el);
void __attribute__((noreturn)) __jump_to_lower_el(uint64_t arg, uintptr_t ep, unsigned int el);
void coldboot_main(void) {
uintptr_t *mmu_l3_table = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
uintptr_t pk2ldr = TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_PK2LDR);
uintptr_t ep;
uint64_t arg;
/* Clear and unmap pk2ldr (which is reused as exception entry stacks) */
memset((void *)pk2ldr, 0, __pk2ldr_end__ - __pk2ldr_start__);
mmu_unmap_range(3, mmu_l3_table, pk2ldr, __pk2ldr_end__ - __pk2ldr_start__);
tlb_invalidate_all_inner_shareable();
/* TODO: stuff & jump to lower EL */
use_core_entrypoint_and_argument(get_core_id(), &ep, &arg);
/* Nintendo jumps to EL1, we jump to EL2. Both are supported with all current packages2. */
__jump_to_lower_el(arg, ep, 2);
}

18
exosphere/src/cpu_context.c
View file

@ -21,12 +21,26 @@
static saved_cpu_context_t g_cpu_contexts[NUM_CPU_CORES] = {0};
void set_core_entrypoint_and_argument(uint32_t core, uint64_t entrypoint_addr, uint64_t argument) {
void use_core_entrypoint_and_argument(uint32_t core, uintptr_t *entrypoint_addr, uint64_t *argument) {
saved_cpu_context_t *ctx = &g_cpu_contexts[core];
if(ctx->ELR_EL3 == 0 || ctx->is_active) {
panic(0xFA000007); /* invalid context */
}
*entrypoint_addr = ctx->ELR_EL3;
*argument = ctx->argument;
ctx->ELR_EL3 = 0;
ctx->argument = 0;
ctx->is_active = true;
}
void set_core_entrypoint_and_argument(uint32_t core, uintptr_t entrypoint_addr, uint64_t argument) {
g_cpu_contexts[core].ELR_EL3 = entrypoint_addr;
g_cpu_contexts[core].argument = argument;
}
uint32_t cpu_on(uint32_t core, uint64_t entrypoint_addr, uint64_t argument) {
uint32_t cpu_on(uint32_t core, uintptr_t entrypoint_addr, uint64_t argument) {
/* Is core valid? */
if (core >= NUM_CPU_CORES) {
return 0xFFFFFFFE;

5
exosphere/src/cpu_context.h
View file

@ -50,9 +50,10 @@ void restore_current_core_context(void);
void set_current_core_active(void);
void set_current_core_inactive(void);
void set_core_entrypoint_and_argument(uint32_t core, uint64_t entrypoint_addr, uint64_t argument);
void use_core_entrypoint_and_argument(uint32_t core, uintptr_t *entrypoint_addr, uint64_t *argument);
void set_core_entrypoint_and_argument(uint32_t core, uintptr_t entrypoint_addr, uint64_t argument);
uint32_t cpu_on(uint32_t core, uint64_t entrypoint_addr, uint64_t argument);
uint32_t cpu_on(uint32_t core, uintptr_t entrypoint_addr, uint64_t argument);
uint32_t cpu_off(void);