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Create a kernel data area for passing information

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This commit is contained in:
Justin C. Miller
2018-03-27 10:40:38 -07:00
parent 561686abd3
commit 2b9a0ca15e
6 changed files with 218 additions and 68 deletions
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29
src/boot/loader.c
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@@ -4,11 +4,14 @@
static CHAR16 kernel_name[] = KERNEL_FILENAME;
EFI_STATUS
loader_load_kernel(void **kernel_image, uint64_t *length)
loader_load_kernel(void **kernel_image, uint64_t *kernel_length, void **kernel_data, uint64_t *data_length)
{
if (kernel_image == 0 || length == 0)
if (kernel_image == 0 || kernel_length == 0)
CHECK_EFI_STATUS_OR_RETURN(EFI_INVALID_PARAMETER, "NULL kernel_image or length pointer");
if (kernel_data == 0 || data_length == 0)
CHECK_EFI_STATUS_OR_RETURN(EFI_INVALID_PARAMETER, "NULL kernel_data or length pointer");
EFI_STATUS status;
EFI_GUID guid = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
EFI_HANDLE *handles = NULL;
@@ -48,7 +51,7 @@ loader_load_kernel(void **kernel_image, uint64_t *length)
CHECK_EFI_STATUS_OR_RETURN(status, "Freeing kernel file info memory");
UINTN page_count = ((buffer_size - 1) / 0x1000) + 1;
EFI_PHYSICAL_ADDRESS addr = KERNEL_PHYS_ADDRESS; // Try to load the kernel in at 1MiB
EFI_PHYSICAL_ADDRESS addr = KERNEL_PHYS_ADDRESS;
EFI_MEMORY_TYPE mem_type = KERNEL_MEMTYPE; // Special value to tell the kernel it's here
status = ST->BootServices->AllocatePages(AllocateAddress, mem_type, page_count, &addr);
if (status == EFI_NOT_FOUND) {
@@ -57,6 +60,7 @@ loader_load_kernel(void **kernel_image, uint64_t *length)
ST->BootServices->AllocatePages(AllocateAnyPages, mem_type, page_count, &addr);
}
CHECK_EFI_STATUS_OR_RETURN(status, "Allocating kernel pages");
Print(L"\n Allocating %u pages at 0x%x", page_count, addr);
buffer = (void *)addr;
status = file->Read(file, &buffer_size, buffer);
@@ -65,8 +69,25 @@ loader_load_kernel(void **kernel_image, uint64_t *length)
status = file->Close(file);
CHECK_EFI_STATUS_OR_RETURN(status, "Closing kernel file handle");
*length = buffer_size;
*kernel_length = buffer_size;
*kernel_image = buffer;
addr += page_count * 0x1000; // Get the next page after the kernel pages
mem_type = KERNEL_DATA_MEMTYPE; // Special value for kernel data
page_count = ((*data_length - 1) / 0x1000) + 1;
status = ST->BootServices->AllocatePages(AllocateAddress, mem_type, page_count, &addr);
if (status == EFI_NOT_FOUND) {
// couldn't get the address we wanted, try loading anywhere
status =
ST->BootServices->AllocatePages(AllocateAnyPages, mem_type, page_count, &addr);
}
CHECK_EFI_STATUS_OR_RETURN(status, "Allocating kernel data pages");
Print(L"\n Allocating %u pages at 0x%x", page_count, addr);
*data_length = page_count * 0x1000;
*kernel_data = (void *)addr;
ST->BootServices->SetMem(*kernel_data, *data_length, 0);
return EFI_SUCCESS;
}
}