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[zion] Add utility to zero out a page when allocating one.

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This commit is contained in:
Drew Galbraith 2023-06-19 23:44:33 -07:00
parent 0b9e0adfbb
commit 164309eada
3 changed files with 25 additions and 19 deletions
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18
zion/memory/physical_memory.cpp
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@ -8,6 +8,17 @@
namespace phys_mem {
namespace {
uint64_t* PageAlign(uint64_t* addr) {
return reinterpret_cast<uint64_t*>(reinterpret_cast<uint64_t>(addr) & ~0xFFF);
}
void ZeroOutPage(uint64_t* ptr) {
ptr = PageAlign(ptr);
for (uint64_t i = 0; i < 512; i++) {
ptr[i] = 0;
}
}
struct BootstrapMemory {
uint64_t init_page = 0;
uint64_t next_page = 0;
@ -163,6 +174,13 @@ uint64_t AllocatePage() {
return page;
}
uint64_t AllocateAndZeroPage() {
uint64_t paddr = AllocatePage();
ZeroOutPage(
reinterpret_cast<uint64_t*>(boot::GetHigherHalfDirectMap() + paddr));
return paddr;
}
uint64_t AllocateContinuous(uint64_t num_continuous) {
if (gPmm == nullptr) {
panic("No physical memory manager!");