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kern: skeleton initial process loading

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This commit is contained in:
Michael Scire 2020-02-15 03:44:41 -08:00
parent 30d6b359f9
commit cbc73f4407
7 changed files with 465 additions and 1 deletions
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87
libraries/libmesosphere/source/kern_initial_process.cpp
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@ -19,6 +19,12 @@ namespace ams::kern {
namespace {
struct InitialProcessInfo {
KProcess *process;
size_t stack_size;
s32 priority;
};
KVirtualAddress GetInitialProcessBinaryAddress() {
return KMemoryLayout::GetPageTableHeapRegion().GetEndAddress() - InitialProcessBinarySizeMax;
}
@ -32,6 +38,59 @@ namespace ams::kern {
MESOSPHERE_ABORT_UNLESS(header->num_processes <= init::GetSlabResourceCounts().num_KProcess);
}
void CreateProcesses(InitialProcessInfo *infos, KVirtualAddress binary_address, const InitialProcessBinaryHeader &header) {
u8 *current = GetPointer<u8>(binary_address + sizeof(InitialProcessBinaryHeader));
const u8 * const end = GetPointer<u8>(binary_address + header.size - sizeof(KInitialProcessHeader));
const size_t num_processes = header.num_processes;
for (size_t i = 0; i < num_processes; i++) {
/* Validate that we can read the current KIP. */
MESOSPHERE_ABORT_UNLESS(current <= end);
KInitialProcessReader reader;
MESOSPHERE_ABORT_UNLESS(reader.Attach(current));
/* Parse process parameters and reserve memory. */
ams::svc::CreateProcessParameter params;
MESOSPHERE_R_ABORT_UNLESS(reader.MakeCreateProcessParameter(std::addressof(params), true));
MESOSPHERE_TODO("Reserve memory");
/* Create the process, and ensure we don't leak pages. */
{
/* Allocate memory for the process. */
MESOSPHERE_TODO("Allocate memory for the process");
/* Map the process's memory into the temporary region. */
MESOSPHERE_TODO("Map the process's page group");
/* Load the process. */
MESOSPHERE_TODO("Load the process");
/* Unmap the temporary mapping. */
MESOSPHERE_TODO("Unmap the process's page group");
/* Create a KProcess object. */
MESOSPHERE_TODO("Create a KProcess");
/* Initialize the process. */
MESOSPHERE_TODO("Initialize the process");
}
/* Set the process's memory permissions. */
MESOSPHERE_TODO("Set process's memory permissions");
/* Register the process. */
MESOSPHERE_TODO("Register the process");
/* Save the process info. */
infos[i].process = /* TODO */ nullptr;
infos[i].stack_size = reader.GetStackSize();
infos[i].priority = reader.GetPriority();
/* Advance the reader. */
current += reader.GetBinarySize();
}
}
KVirtualAddress g_initial_process_binary_address;
InitialProcessBinaryHeader g_initial_process_binary_header;
u64 g_initial_process_id_min = std::numeric_limits<u64>::max();
@ -71,4 +130,32 @@ namespace ams::kern {
}
}
void CreateAndRunInitialProcesses() {
/* Allocate space for the processes. */
InitialProcessInfo *infos = static_cast<InitialProcessInfo *>(__builtin_alloca(sizeof(InitialProcessInfo) * g_initial_process_binary_header.num_processes));
/* Create the processes. */
CreateProcesses(infos, g_initial_process_binary_address, g_initial_process_binary_header);
/* Release the memory used by the image. */
{
const size_t total_size = util::AlignUp(g_initial_process_binary_header.size, PageSize);
const size_t num_pages = total_size / PageSize;
Kernel::GetMemoryManager().Close(g_initial_process_binary_address, num_pages);
Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_PhysicalMemoryMax, total_size);
}
/* Determine the initial process id range. */
for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
const auto pid = infos[i].process->GetId();
g_initial_process_id_min = std::min(g_initial_process_id_min, pid);
g_initial_process_id_max = std::max(g_initial_process_id_max, pid);
}
/* Run the processes. */
for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
MESOSPHERE_TODO("infos[i].process->Run(infos[i].priority, infos[i].stack_size);");
}
}
}