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#include "loader_efi.h"
#include <loader/data_efi.h>
#include <kernel/entry.h>
static CHAR16 *kernel_path = L"\\adasoft\\sophia\\kernel.os";
static struct system_image *kernel_image = NULL;
static struct efi_memory_map_data *get_memory_map_data(void);
static struct efi_framebuffer_data *get_framebuffer_data(void);
static void *get_acpi_data(void);
noreturn static void enter_kernel()
{
struct efi_boot_data data;
kernel_entry_func kernel_entry;
kernel_entry = (kernel_entry_func)(kernel_image->ehdr.e_entry);
struct memory_range kernel_entry_stack =
system_allocate(KERNEL_ENTRY_STACK_SIZE);
// get a stack here for now idfk
paging_map_range(KERNEL_ENTRY_STACK_BASE,
&kernel_entry_stack,
DATA_PAGE_TYPE);
data.system_table = e_st;
data.acpi = get_acpi_data();
data.framebuffer = get_framebuffer_data();
data.memory_map = get_memory_map_data();
EFI_STATUS status = e_bs->ExitBootServices(e_image_handle,
data.memory_map->key);
if (EFI_ERROR(status))
{
Print(L"failed exiting boot services environment: %r\r\n", status);
efi_exit(status);
}
// enter the kernel address environment
paging_enter();
// set the kernel entry stack.
__asm__
(
"mov %0, %%rsp"
:
: "r"((uint64_t)KERNEL_ENTRY_STACK_HEAD)
);
kernel_entry(&data);
while(true);
}
void loader_main(void)
{
kernel_image = system_image_open(kernel_path);
Print(L"loading %s\r\n", kernel_path);
if (system_image_load(kernel_image))
{
Print(L"loaded kernel image at base %16.0lx size %d bytes\r\n",
kernel_image->buffer.base,
kernel_image->buffer.size);
}
else
{
Print(L"failed loading kernel image\r\n");
efi_exit(EFI_ABORTED);
}
paging_init();
system_image_map(kernel_image);
Print(L"kernel maps created. entering kernel\r\n");
enter_kernel();
efi_exit(EFI_ABORTED);
}
static struct efi_memory_map_data *get_memory_map_data(void)
{
EFI_STATUS status;
UINTN mapsize = 0;
struct efi_memory_map_data *map = NULL;
status = e_bs->GetMemoryMap(&mapsize, NULL, NULL, NULL, NULL);
if (status == EFI_BUFFER_TOO_SMALL)
{
map = efi_allocate(sizeof(*map) + mapsize);
}
if (map)
{
status = e_bs->GetMemoryMap(&map->size,
map->data,
&map->key,
&map->descsize,
&map->descver);
}
else
{
status = e_last_error;
}
if (EFI_ERROR(status))
{
Print(L"failed getting memory map: %r\r\n", status);
return NULL;
}
return map;
}
static struct efi_framebuffer_data *get_framebuffer_data(void)
{
struct efi_framebuffer_data *framebuffer;
if (!e_graphics_output)
{
return NULL;
}
framebuffer = efi_allocate(sizeof(*framebuffer));
if (framebuffer)
{
EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *mode = e_graphics_output->Mode;
framebuffer->bitmask = mode->Info->PixelInformation;
framebuffer->width = mode->Info->HorizontalResolution;
framebuffer->height = mode->Info->VerticalResolution;
framebuffer->buffer.base = mode->FrameBufferBase;
framebuffer->buffer.size = mode->FrameBufferSize;
framebuffer->buffer.type = RESERVED_MEMORY;
framebuffer->pxformat = mode->Info->PixelFormat;
switch (framebuffer->pxformat)
{
//falthrough
case PixelBlueGreenRedReserved8BitPerColor:
case PixelRedGreenBlueReserved8BitPerColor:
framebuffer->pxsize = sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL);
break;
default:
// TODO: calculate pixel size for bitmask format
framebuffer->pxsize = 0;
}
framebuffer->pitch = framebuffer->width * framebuffer->pxsize;
}
else
{
Print(L"failed getting framebuffer data: %r\r\n", e_last_error);
return NULL;
}
return framebuffer;
}
static void *get_acpi_data(void)
{
struct efi_acpi_data *acpi = efi_allocate(sizeof(*acpi));
EFI_GUID acpi_20_guid = ACPI_20_TABLE_GUID;
for (UINTN i = 0; acpi && i < e_st->NumberOfTableEntries; i++)
{
if (!CompareGuid(&acpi_20_guid, &e_st->ConfigurationTable[i].VendorGuid))
{
acpi->rsdp = e_st->ConfigurationTable[i].VendorTable;
return acpi;
}
}
Print(L"failed getting acpi rsdp\r\n");
return NULL;
}
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