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Add a threading syscall API.

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This commit is contained in:
Drew Galbraith 2023-06-06 16:24:03 -07:00
parent e2aad55a8a
commit ef8eb5d993
14 changed files with 235 additions and 30 deletions
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35
zion/memory/paging_util.cpp
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@ -136,6 +136,22 @@ uint64_t CurrCr3() {
return pml4_addr;
}
void CopyPageIntoNonResidentProcess(uint64_t base, uint64_t size,
Process& dest_proc, uint64_t dest_virt) {
if (size > 0x1000) {
panic("NR copy > 1 page");
}
if (dest_virt & 0xFFF) {
panic("NR copy to non page aligned");
}
uint64_t phys = AllocatePageIfNecessary(dest_virt, dest_proc.vmm().cr3());
uint8_t* src = reinterpret_cast<uint8_t*>(base);
uint8_t* dest =
reinterpret_cast<uint8_t*>(phys + boot::GetHigherHalfDirectMap());
for (uint64_t i = 0; i < size; i++) {
dest[i] = src[i];
}
}
} // namespace
void InitializePml4(uint64_t pml4_physical_addr) {
@ -176,18 +192,13 @@ void EnsureResident(uint64_t addr, uint64_t size) {
void CopyIntoNonResidentProcess(uint64_t base, uint64_t size,
Process& dest_proc, uint64_t dest_virt) {
if (size > 0x1000) {
panic("Unimplemented NR copy > 1 page");
}
if (dest_virt & 0xFFF) {
panic("Unimplemented NR copy to non page aligned");
}
uint64_t phys = AllocatePageIfNecessary(dest_virt, dest_proc.vmm().cr3());
uint8_t* src = reinterpret_cast<uint8_t*>(base);
uint8_t* dest =
reinterpret_cast<uint8_t*>(phys + boot::GetHigherHalfDirectMap());
while (size > 0) {
uint64_t to_copy = size > 0x1000 ? 0x1000 : size;
for (uint64_t i = 0; i < size; i++) {
dest[i] = src[i];
CopyPageIntoNonResidentProcess(base, to_copy, dest_proc, dest_virt);
size -= to_copy;
base += 0x1000;
dest_virt += 0x1000;
}
}