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reset2: Add PSCI system_reset2 function

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This patch implements PSCI_SYSTEM_RESET2 API as defined in PSCI
v1.1 specification. The specification allows architectural and
vendor-specific resets via this API. In the current specification,
there is only one architectural reset, the warm reset. This reset is
intended to provide a fast reboot path that guarantees not to reset
system main memory.

Change-Id: I057bb81a60cd0fe56465dbb5791d8e1cca025bd3
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
This commit is contained in:
Roberto Vargas 2017-07-26 09:23:09 +01:00
parent 4d415c11c4
commit 36a8f8fd47
5 changed files with 54 additions and 1 deletions
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30
lib/psci/psci_system_off.c
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@ -49,3 +49,33 @@ void __dead2 psci_system_reset(void)
/* This function does not return. We should never get here */
}
int psci_system_reset2(uint32_t reset_type, u_register_t cookie)
{
int is_vendor;
psci_print_power_domain_map();
assert(psci_plat_pm_ops->system_reset2);
is_vendor = (reset_type >> PSCI_RESET2_TYPE_VENDOR_SHIFT) & 1;
if (!is_vendor) {
/*
* Only WARM_RESET is allowed for architectural type resets.
*/
if (reset_type != PSCI_RESET2_SYSTEM_WARM_RESET)
return PSCI_E_INVALID_PARAMS;
if (psci_plat_pm_ops->write_mem_protect &&
psci_plat_pm_ops->write_mem_protect(0) < 0) {
return PSCI_E_NOT_SUPPORTED;
}
}
/* Notify the Secure Payload Dispatcher */
if (psci_spd_pm && psci_spd_pm->svc_system_reset) {
psci_spd_pm->svc_system_reset();
}
console_flush();
return psci_plat_pm_ops->system_reset2(is_vendor, reset_type, cookie);
}