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main.c
171 lines (134 loc) · 4.97 KB
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main.c
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#include <stdalign.h>
#include <stddef.h>
#include <efi/efi.h>
#include "console.h"
#include "guids.h"
#include "kernel_data.h"
#include "loader.h"
#include "memory.h"
#include "utility.h"
#ifndef GIT_VERSION_WIDE
#define GIT_VERSION_WIDE L"no version"
#endif
#define KERNEL_HEADER_MAGIC 0x600db007
#define KERNEL_HEADER_VERSION 1
#pragma pack(push, 1)
struct kernel_header {
uint32_t magic;
uint16_t version;
uint16_t length;
uint8_t major;
uint8_t minor;
uint16_t patch;
uint32_t gitsha;
};
#pragma pack(pop)
EFI_STATUS
efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table)
{
EFI_STATUS status;
EFI_BOOT_SERVICES *bootsvc = system_table->BootServices;
EFI_RUNTIME_SERVICES *runsvc = system_table->RuntimeServices;
// When checking console initialization, use CHECK_EFI_STATUS_OR_RETURN
// because we can't be sure if the console was fully set up
status = con_initialize(system_table, GIT_VERSION_WIDE);
CHECK_EFI_STATUS_OR_RETURN(status, "con_initialize");
// From here on out, we can use CHECK_EFI_STATUS_OR_FAIL instead
memory_init_pointer_fixup(bootsvc, runsvc);
// Find ACPI tables. Ignore ACPI 1.0 if a 2.0 table is found.
//
void *acpi_table = NULL;
for (size_t i=0; i<system_table->NumberOfTableEntries; ++i) {
EFI_CONFIGURATION_TABLE *efi_table = &system_table->ConfigurationTable[i];
if (is_guid(&efi_table->VendorGuid, &guid_acpi2)) {
acpi_table = efi_table->VendorTable;
break;
} else if (is_guid(&efi_table->VendorGuid, &guid_acpi1)) {
// Mark a v1 table with the LSB high
acpi_table = (void *)((intptr_t)efi_table->VendorTable | 0x1);
}
}
// Compute necessary number of data pages
//
size_t data_length = 0;
status = memory_get_map_length(bootsvc, &data_length);
CHECK_EFI_STATUS_OR_FAIL(status);
size_t header_size = sizeof(struct popcorn_data);
const size_t header_align = alignof(struct popcorn_data);
if (header_size % header_align)
header_size += header_align - (header_size % header_align);
data_length += header_size;
// Load the kernel image from disk and check it
//
con_printf(L"Loading kernel into memory...\r\n");
struct loader_data load;
load.data_length = data_length;
status = loader_load_kernel(bootsvc, &load);
CHECK_EFI_STATUS_OR_FAIL(status);
con_printf(L" %u image bytes at 0x%x\r\n", load.kernel_length, load.kernel);
con_printf(L" %u font bytes at 0x%x\r\n", load.font_length, load.font);
con_printf(L" %u data bytes at 0x%x\r\n", load.data_length, load.data);
struct kernel_header *version = (struct kernel_header *)load.kernel;
if (version->magic != KERNEL_HEADER_MAGIC) {
con_printf(L" bad magic %x\r\n", version->magic);
CHECK_EFI_STATUS_OR_FAIL(EFI_CRC_ERROR);
}
con_printf(L" Kernel version %d.%d.%d %x%s\r\n",
version->major, version->minor, version->patch, version->gitsha & 0x0fffffff,
version->gitsha & 0xf0000000 ? "*" : "");
con_printf(L" Entrypoint 0x%x\r\n", load.kernel_entry);
void (*kernel_main)() = load.kernel_entry;
memory_mark_pointer_fixup((void **)&kernel_main);
// Set up the kernel data pages to pass to the kernel
//
struct popcorn_data *data_header = (struct popcorn_data *)load.data;
memory_mark_pointer_fixup((void **)&data_header);
data_header->magic = DATA_HEADER_MAGIC;
data_header->version = DATA_HEADER_VERSION;
data_header->length = sizeof(struct popcorn_data);
data_header->flags = 0;
data_header->font = load.font;
data_header->font_length = load.font_length;
memory_mark_pointer_fixup((void **)&data_header->font);
data_header->data = load.data;
data_header->data_length = load.data_length;
memory_mark_pointer_fixup((void **)&data_header->data);
data_header->memory_map = (EFI_MEMORY_DESCRIPTOR *)(data_header + 1);
memory_mark_pointer_fixup((void **)&data_header->memory_map);
data_header->runtime = runsvc;
memory_mark_pointer_fixup((void **)&data_header->runtime);
data_header->acpi_table = acpi_table;
memory_mark_pointer_fixup((void **)&data_header->acpi_table);
data_header->_reserved0 = 0;
data_header->_reserved1 = 0;
// Figure out the framebuffer (if any) and add that to the data header
//
status = con_get_framebuffer(
bootsvc,
&data_header->frame_buffer,
&data_header->frame_buffer_length,
&data_header->hres,
&data_header->vres,
&data_header->rmask,
&data_header->gmask,
&data_header->bmask);
CHECK_EFI_STATUS_OR_FAIL(status);
memory_mark_pointer_fixup((void **)&data_header->frame_buffer);
// Save the memory map and tell the firmware we're taking control.
//
struct memory_map map;
map.entries = data_header->memory_map;
map.length = (load.data_length - header_size);
status = memory_get_map(bootsvc, &map);
CHECK_EFI_STATUS_OR_FAIL(status);
data_header->memory_map_length = map.length;
data_header->memory_map_desc_size = map.size;
// bootsvc->Stall(5000000);
status = bootsvc->ExitBootServices(image_handle, map.key);
CHECK_EFI_STATUS_OR_ASSERT(status, 0);
memory_virtualize(runsvc, &map);
// Hand control to the kernel
//
kernel_main(data_header);
return EFI_LOAD_ERROR;
}