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Virtualizing memory after exiting boot services

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This commit is contained in:
Justin C. Miller
2018-03-22 19:16:44 -07:00
parent b5c579fe0d
commit cdef82f06f
6 changed files with 86 additions and 35 deletions
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39
src/boot/memory.c
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@@ -2,6 +2,7 @@
#include <efilib.h>
#include "memory.h"
#include "loader.h"
#include "utility.h"
const UINTN PAGE_SIZE = 4096;
@@ -30,20 +31,35 @@ static const CHAR16 *memory_type_name(UINT32 value) {
return memory_type_names[value];
}
void EFIAPI memory_update_addresses(EFI_EVENT UNUSED *event, void UNUSED *context) {
//ST->RuntimeServices->ConvertPointer(0, (void **)&BS);
ST->RuntimeServices->ConvertPointer(0, (void **)&ST);
void EFIAPI memory_update_addresses(EFI_EVENT UNUSED *event, void *context) {
ST->RuntimeServices->ConvertPointer(0, (void **)context);
}
EFI_STATUS memory_virtualize() {
EFI_STATUS status;
EFI_STATUS memory_mark_address_for_update(void **pointer) {
EFI_EVENT event;
EFI_STATUS status;
status = ST->BootServices->CreateEvent(
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
TPL_CALLBACK,
(EFI_EVENT_NOTIFY)&memory_update_addresses,
(void*)pointer,
&event);
status = ST->BootServices->CreateEvent(EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
TPL_CALLBACK, (EFI_EVENT_NOTIFY)&memory_update_addresses, NULL, &event);
CHECK_EFI_STATUS_OR_RETURN(status, "Failed to create memory update event");
}
return status;
EFI_STATUS memory_virtualize(void **kernel_addr, EFI_MEMORY_DESCRIPTOR *memory_map,
UINTN memmap_size, UINTN desc_size, UINT32 desc_version) {
unsigned count = memmap_size / desc_size;
for (unsigned i=0; i<count; ++i) {
if (memory_map[i].Type == KERNEL_MEMTYPE)
memory_map[i].VirtualStart = (EFI_VIRTUAL_ADDRESS)KERNEL_VIRT_ADDRESS;
else
memory_map[i].VirtualStart = (EFI_VIRTUAL_ADDRESS)memory_map[i].PhysicalStart;
}
return ST->RuntimeServices->SetVirtualAddressMap(memmap_size, desc_size, desc_version, memory_map);
}
EFI_STATUS memory_get_map(EFI_MEMORY_DESCRIPTOR **buffer, UINTN *buffer_size,
@@ -58,7 +74,6 @@ EFI_STATUS memory_get_map(EFI_MEMORY_DESCRIPTOR **buffer, UINTN *buffer_size,
// Give some extra buffer to account for changes.
*buffer_size = needs_size + 256;
Print(L"Trying to load memory map with size %d.\n", *buffer_size);
status = ST->BootServices->AllocatePool(EfiLoaderData, *buffer_size, (void**)buffer);
CHECK_EFI_STATUS_OR_RETURN(status, "Failed to allocate space for memory map");
@@ -88,10 +103,8 @@ EFI_STATUS memory_dump_map() {
while (d < end) {
UINTN size_bytes = d->NumberOfPages * PAGE_SIZE;
Print(L"Type: %s Attr: 0x%x\n", memory_type_name(d->Type), d->Attribute);
Print(L"\t Physical %016llx - %016llx\n", d->PhysicalStart, d->PhysicalStart + size_bytes);
if (d->VirtualStart != 0)
Print(L"\t Virtual %016llx - %016llx\n\n", d->VirtualStart, d->VirtualStart + size_bytes);
Print(L"%23s ", memory_type_name(d->Type));
Print(L"%016llx (%3d pages)\n", d->PhysicalStart, size_bytes / 0x1000);
d = (EFI_MEMORY_DESCRIPTOR *)((uint8_t *)d + desc_size);
}