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Give kernel image a header.

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Kernel image now has a header with version, magic number, and a
pointer to its actual entrypoint. Entry point is now _start in
boot.s, and we now generate versions.s in the build tree for the
version macros.
This commit is contained in:
Justin C. Miller
2018-03-24 18:34:44 -07:00
parent d438392ed5
commit e19c7cee50
11 changed files with 246 additions and 28 deletions
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43
src/boot/main.c
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@@ -10,6 +10,19 @@
#define GIT_VERSION L"no version"
#endif
#define KERNEL_MAGIC 0x600db007
#pragma pack(push, 1)
struct kernel_version {
uint32_t magic;
uint8_t major;
uint8_t minor;
uint16_t patch;
uint32_t gitsha;
void *entrypoint;
};
#pragma pack(pop)
EFI_STATUS
efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
{
@@ -26,19 +39,39 @@ efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
// because the console is now set up
// Get info about the image
/*
con_status_begin(L"Gathering image information...");
EFI_LOADED_IMAGE *info = 0;
EFI_GUID image_proto = EFI_LOADED_IMAGE_PROTOCOL_GUID;
status = ST->BootServices->HandleProtocol(ImageHandle, &image_proto, (void **)&info);
CHECK_EFI_STATUS_OR_FAIL(status);
con_status_ok();
*/
con_status_begin(L"Loading kernel into memory...");
void *kernel_image = NULL;
uint64_t kernel_length = 0;
status = loader_load_kernel(&kernel_image, &kernel_length);
CHECK_EFI_STATUS_OR_FAIL(status);
Print(L" %u bytes at 0x%x", kernel_length, kernel_image);
Print(L"\n %u bytes at 0x%x", kernel_length, kernel_image);
struct kernel_version *version = (struct kernel_version*)kernel_image;
if (version->magic != KERNEL_MAGIC) {
Print(L"\n bad magic %x", version->magic);
CHECK_EFI_STATUS_OR_FAIL(EFI_CRC_ERROR);
}
Print(L"\n Kernel version %d.%d.%d %x%s",
version->major,
version->minor,
version->patch,
version->gitsha & 0x0fffffff,
version->gitsha & 0xf0000000 ? "*" : ""
);
Print(L"\n Entrypoint %d", version->entrypoint);
void (*kernel_main)() = version->entrypoint;
con_status_ok();
//memory_dump_map();
@@ -55,6 +88,9 @@ efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
status = memory_mark_address_for_update((void**)&kernel_image);
CHECK_EFI_STATUS_OR_FAIL(status);
status = memory_mark_address_for_update((void**)&kernel_main);
CHECK_EFI_STATUS_OR_FAIL(status);
status = memory_get_map(&memory_map,
&memmap_size, &memmap_key,
&desc_size, &desc_version);
@@ -70,10 +106,7 @@ efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
CHECK_EFI_STATUS_OR_FAIL(status);
void (*kernel_main)() = kernel_image;
kernel_main();
while (1) __asm__("hlt");
return status;
return EFI_LOAD_ERROR;
}