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exosphere: Add support for rebooting to a payload in IRAM.

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This commit is contained in:
Michael Scire 2019-01-20 02:50:13 -08:00
parent d349bdb1f8
commit a52e601f2e
2 changed files with 25 additions and 8 deletions
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25
exosphere/src/configitem.c
View file

@ -35,13 +35,26 @@ uint32_t configitem_set(bool privileged, ConfigItem item, uint64_t value) {
case CONFIGITEM_BATTERYPROFILE:
g_battery_profile = (value != 0);
break;
case CONFIGITEM_NEEDS_REBOOT_TO_RCM:
case CONFIGITEM_NEEDS_REBOOT:
/* Force a reboot to RCM, if requested. */
if (value != 0) {
switch (value) {
case REBOOT_KIND_NO_REBOOT:
return 0;
case REBOOT_KIND_TO_RCM:
/* Set reboot kind = rcm. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x450ull) = 0x2;
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x400ull) = 0x10;
while (1) { }
break;
case REBOOT_KIND_TO_WB_PAYLOAD:
/* Set reboot kind = warmboot. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x450ull) = 0x1;
/* Patch bootrom to jump to payload. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x118) = 0x40010000; /* Return to start of payload. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x11C) = 0x4000FFA4; /* Overwrite bootrom return address on stack. */
break;
default:
return 2;
}
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x400ull) = 0x10;
break;
default:
return 2;
@ -187,8 +200,8 @@ uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue)
((uint64_t)(exosphere_get_target_firmware() & 0xFF) << 8ull) |
((uint64_t)(mkey_get_revision() & 0xFF) << 0ull);
break;
case CONFIGITEM_NEEDS_REBOOT_TO_RCM:
/* UNOFFICIAL: The fact that we are executing means we aren't in the process of rebooting to rcm. */
case CONFIGITEM_NEEDS_REBOOT:
/* UNOFFICIAL: The fact that we are executing means we aren't in the process of rebooting. */
*p_outvalue = 0;
break;
default:

6
exosphere/src/configitem.h
View file

@ -41,9 +41,13 @@ typedef enum {
/* These are unofficial, for usage by Exosphere. */
CONFIGITEM_EXOSPHERE_VERSION = 65000,
CONFIGITEM_NEEDS_REBOOT_TO_RCM = 65001,
CONFIGITEM_NEEDS_REBOOT = 65001,
} ConfigItem;
#define REBOOT_KIND_NO_REBOOT 0
#define REBOOT_KIND_TO_RCM 1
#define REBOOT_KIND_TO_WB_PAYLOAD 2
uint32_t configitem_set(bool privileged, ConfigItem item, uint64_t value);
uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue);