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pm/cfg: simplify initial process id range logic

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This commit is contained in:
Michael Scire 2021-10-01 17:37:39 -07:00
parent 18825866ac
commit 65fd967550
2 changed files with 30 additions and 56 deletions
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58
libraries/libstratosphere/source/cfg/cfg_privileged_process.cpp
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@ -19,66 +19,42 @@ namespace ams::cfg {
namespace {
/* Convenience definitions. */
constexpr os::ProcessId InitialProcessIdMinDeprecated = {0x00};
constexpr os::ProcessId InitialProcessIdMaxDeprecated = {0x50};
/* Privileged process globals. */
constinit os::SdkMutex g_lock;
constinit bool g_got_privileged_process_status = false;
constinit os::ProcessId g_min_initial_process_id = os::InvalidProcessId, g_max_initial_process_id = os::InvalidProcessId;
constinit os::ProcessId g_cur_process_id = os::InvalidProcessId;
/* SD card helpers. */
void GetPrivilegedProcessIdRange(os::ProcessId *out_min, os::ProcessId *out_max) {
os::ProcessId min = os::InvalidProcessId, max = os::InvalidProcessId;
if (hos::GetVersion() >= hos::Version_5_0_0) {
/* On 5.0.0+, we can get precise limits from svcGetSystemInfo. */
R_ABORT_UNLESS(svcGetSystemInfo(reinterpret_cast<u64 *>(&min), SystemInfoType_InitialProcessIdRange, INVALID_HANDLE, InitialProcessIdRangeInfo_Minimum));
R_ABORT_UNLESS(svcGetSystemInfo(reinterpret_cast<u64 *>(&max), SystemInfoType_InitialProcessIdRange, INVALID_HANDLE, InitialProcessIdRangeInfo_Maximum));
} else if (hos::GetVersion() >= hos::Version_4_0_0) {
/* On 4.0.0-4.1.0, we can get the precise limits from normal svcGetInfo. */
R_ABORT_UNLESS(svcGetInfo(reinterpret_cast<u64 *>(&min), InfoType_InitialProcessIdRange, INVALID_HANDLE, InitialProcessIdRangeInfo_Minimum));
R_ABORT_UNLESS(svcGetInfo(reinterpret_cast<u64 *>(&max), InfoType_InitialProcessIdRange, INVALID_HANDLE, InitialProcessIdRangeInfo_Maximum));
} else {
/* On < 4.0.0, we just use hardcoded extents. */
min = InitialProcessIdMinDeprecated;
max = InitialProcessIdMaxDeprecated;
ALWAYS_INLINE void EnsurePrivilegedProcessStatusCached() {
if (AMS_LIKELY(g_got_privileged_process_status)) {
return;
}
*out_min = min;
*out_max = max;
}
std::scoped_lock lk(g_lock);
void GetPrivilegedProcessStatus() {
GetPrivilegedProcessIdRange(&g_min_initial_process_id, &g_max_initial_process_id);
g_cur_process_id = os::GetCurrentProcessId();
g_got_privileged_process_status = true;
if (AMS_LIKELY(!g_got_privileged_process_status)) {
R_ABORT_UNLESS(svc::GetSystemInfo(std::addressof(g_min_initial_process_id.value), svc::SystemInfoType_InitialProcessIdRange, svc::InvalidHandle, svc::InitialProcessIdRangeInfo_Minimum));
R_ABORT_UNLESS(svc::GetSystemInfo(std::addressof(g_max_initial_process_id.value), svc::SystemInfoType_InitialProcessIdRange, svc::InvalidHandle, svc::InitialProcessIdRangeInfo_Maximum));
g_cur_process_id = os::GetCurrentProcessId();
g_got_privileged_process_status = true;
}
}
}
/* Privileged Process utilities. */
bool IsInitialProcess() {
std::scoped_lock lk(g_lock);
/* Cache initial process range and extents. */
EnsurePrivilegedProcessStatusCached();
/* If we've not detected, do detection. */
if (!g_got_privileged_process_status) {
GetPrivilegedProcessStatus();
}
/* Determine if we're privileged, and return. */
/* Determine if we're Initial. */
return g_min_initial_process_id <= g_cur_process_id && g_cur_process_id <= g_max_initial_process_id;
}
void GetInitialProcessRange(os::ProcessId *out_min, os::ProcessId *out_max) {
std::scoped_lock lk(g_lock);
/* If we've not detected, do detection. */
if (!g_got_privileged_process_status) {
GetPrivilegedProcessStatus();
}
/* Cache initial process range and extents. */
EnsurePrivilegedProcessStatusCached();
/* Set output. */
*out_min = g_min_initial_process_id;
*out_max = g_max_initial_process_id;
}