Atmosphere/exosphere/cpu_context.c

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#include <stdint.h>
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#include "cpu_context.h"
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#include "pmc.h"
#include "timers.h"
#include "utils.h"
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saved_cpu_context_t g_cpu_contexts[NUM_CPU_CORES] = {0};
void set_core_entrypoint_and_context_id(uint32_t core, uint64_t entrypoint_addr, uint64_t context_id) {
g_cpu_contexts[core].ELR_EL3 = entrypoint_addr;
g_cpu_contexts[core].context_id = context_id;
}
uint32_t cpu_on(uint32_t core, uint64_t entrypoint_addr, uint64_t context_id) {
/* Is core valid? */
if (core >= NUM_CPU_CORES) {
return 0xFFFFFFFE;
}
/* Is core already on? */
if (g_cpu_contexts[core].is_active) {
return 0xFFFFFFFC;
}
set_core_entrypoint_and_context_id(core, entrypoint_addr, context_id);
const uint32_t status_masks[NUM_CPU_CORES] = {0x4000, 0x200, 0x400, 0x800};
const uint32_t toggle_vals[NUM_CPU_CORES] = {0xE, 0x9, 0xA, 0xB};
/* Check if we're already in the correct state. */
if ((APBDEV_PMC_PWRGATE_STATUS_0 & status_masks[core]) != status_masks[core]) {
uint32_t counter = 5001;
/* Poll the start bit until 0 */
while (APBDEV_PMC_PWRGATE_TOGGLE_0 & 0x100) {
wait(1);
counter--;
if (counter < 1) {
return 0;
}
}
/* Program PWRGATE_TOGGLE with the START bit set to 1, selecting CE[N] */
APBDEV_PMC_PWRGATE_TOGGLE_0 = toggle_vals[core] | 0x100;
/* Poll until we're in the correct state. */
counter = 5001;
while (counter > 0) {
if ((APBDEV_PMC_PWRGATE_STATUS_0 & status_masks[core]) == status_masks[core]) {
break;
}
wait(1);
counter--;
}
}
return 0;
}