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OpenCloudOS-Kernel/arch/x86/boot/compressed/eboot.c

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/* -----------------------------------------------------------------------
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*
* This file is part of the Linux kernel, and is made available under
* the terms of the GNU General Public License version 2.
*
* ----------------------------------------------------------------------- */
#include <linux/efi.h>
#include <linux/pci.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include <asm/desc.h>
#undef memcpy /* Use memcpy from misc.c */
#include "eboot.h"
static efi_system_table_t *sys_table;
#include "../../../../drivers/firmware/efi/efi-stub-helper.c"
static void find_bits(unsigned long mask, u8 *pos, u8 *size)
{
u8 first, len;
first = 0;
len = 0;
if (mask) {
while (!(mask & 0x1)) {
mask = mask >> 1;
first++;
}
while (mask & 0x1) {
mask = mask >> 1;
len++;
}
}
*pos = first;
*size = len;
}
static efi_status_t setup_efi_pci(struct boot_params *params)
{
efi_pci_io_protocol *pci;
efi_status_t status;
void **pci_handle;
efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
unsigned long nr_pci, size = 0;
int i;
struct setup_data *data;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, &pci_proto,
NULL, &size, pci_handle);
if (status == EFI_BUFFER_TOO_SMALL) {
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, size, &pci_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, &pci_proto,
NULL, &size, pci_handle);
}
if (status != EFI_SUCCESS)
goto free_handle;
nr_pci = size / sizeof(void *);
for (i = 0; i < nr_pci; i++) {
void *h = pci_handle[i];
uint64_t attributes;
struct pci_setup_rom *rom;
status = efi_call_phys3(sys_table->boottime->handle_protocol,
h, &pci_proto, &pci);
if (status != EFI_SUCCESS)
continue;
if (!pci)
continue;
#ifdef CONFIG_X86_64
status = efi_call_phys4(pci->attributes, pci,
EfiPciIoAttributeOperationGet, 0,
&attributes);
#else
status = efi_call_phys5(pci->attributes, pci,
EfiPciIoAttributeOperationGet, 0, 0,
&attributes);
#endif
if (status != EFI_SUCCESS)
continue;
if (!pci->romimage || !pci->romsize)
continue;
size = pci->romsize + sizeof(*rom);
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, size, &rom);
if (status != EFI_SUCCESS)
continue;
rom->data.type = SETUP_PCI;
rom->data.len = size - sizeof(struct setup_data);
rom->data.next = 0;
rom->pcilen = pci->romsize;
status = efi_call_phys5(pci->pci.read, pci,
EfiPciIoWidthUint16, PCI_VENDOR_ID,
1, &(rom->vendor));
if (status != EFI_SUCCESS)
goto free_struct;
status = efi_call_phys5(pci->pci.read, pci,
EfiPciIoWidthUint16, PCI_DEVICE_ID,
1, &(rom->devid));
if (status != EFI_SUCCESS)
goto free_struct;
status = efi_call_phys5(pci->get_location, pci,
&(rom->segment), &(rom->bus),
&(rom->device), &(rom->function));
if (status != EFI_SUCCESS)
goto free_struct;
memcpy(rom->romdata, pci->romimage, pci->romsize);
if (data)
data->next = (unsigned long)rom;
else
params->hdr.setup_data = (unsigned long)rom;
data = (struct setup_data *)rom;
continue;
free_struct:
efi_call_phys1(sys_table->boottime->free_pool, rom);
}
free_handle:
efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
return status;
}
/*
* See if we have Graphics Output Protocol
*/
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size)
{
struct efi_graphics_output_protocol *gop, *first_gop;
struct efi_pixel_bitmask pixel_info;
unsigned long nr_gops;
efi_status_t status;
void **gop_handle;
u16 width, height;
u32 fb_base, fb_size;
u32 pixels_per_scan_line;
int pixel_format;
int i;
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, size, &gop_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, proto,
NULL, &size, gop_handle);
if (status != EFI_SUCCESS)
goto free_handle;
first_gop = NULL;
nr_gops = size / sizeof(void *);
for (i = 0; i < nr_gops; i++) {
struct efi_graphics_output_mode_info *info;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
bool conout_found = false;
void *dummy;
void *h = gop_handle[i];
status = efi_call_phys3(sys_table->boottime->handle_protocol,
h, proto, &gop);
if (status != EFI_SUCCESS)
continue;
status = efi_call_phys3(sys_table->boottime->handle_protocol,
h, &conout_proto, &dummy);
if (status == EFI_SUCCESS)
conout_found = true;
status = efi_call_phys4(gop->query_mode, gop,
gop->mode->mode, &size, &info);
if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
/*
* Systems that use the UEFI Console Splitter may
* provide multiple GOP devices, not all of which are
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
*/
width = info->horizontal_resolution;
height = info->vertical_resolution;
fb_base = gop->mode->frame_buffer_base;
fb_size = gop->mode->frame_buffer_size;
pixel_format = info->pixel_format;
pixel_info = info->pixel_information;
pixels_per_scan_line = info->pixels_per_scan_line;
/*
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
first_gop = gop;
if (conout_found)
break;
}
}
/* Did we find any GOPs? */
if (!first_gop)
goto free_handle;
/* EFI framebuffer */
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_width = width;
si->lfb_height = height;
si->lfb_base = fb_base;
si->pages = 1;
if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
si->red_size = 8;
si->red_pos = 0;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 16;
si->rsvd_size = 8;
si->rsvd_pos = 24;
} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
si->red_size = 8;
si->red_pos = 16;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 0;
si->rsvd_size = 8;
si->rsvd_pos = 24;
} else if (pixel_format == PIXEL_BIT_MASK) {
find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
find_bits(pixel_info.green_mask, &si->green_pos,
&si->green_size);
find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
&si->rsvd_size);
si->lfb_depth = si->red_size + si->green_size +
si->blue_size + si->rsvd_size;
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
} else {
si->lfb_depth = 4;
si->lfb_linelength = si->lfb_width / 2;
si->red_size = 0;
si->red_pos = 0;
si->green_size = 0;
si->green_pos = 0;
si->blue_size = 0;
si->blue_pos = 0;
si->rsvd_size = 0;
si->rsvd_pos = 0;
}
si->lfb_size = si->lfb_linelength * si->lfb_height;
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
free_handle:
efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
return status;
}
/*
* See if we have Universal Graphics Adapter (UGA) protocol
*/
static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
unsigned long size)
{
struct efi_uga_draw_protocol *uga, *first_uga;
unsigned long nr_ugas;
efi_status_t status;
u32 width, height;
void **uga_handle = NULL;
int i;
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, size, &uga_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, uga_proto,
NULL, &size, uga_handle);
if (status != EFI_SUCCESS)
goto free_handle;
first_uga = NULL;
nr_ugas = size / sizeof(void *);
for (i = 0; i < nr_ugas; i++) {
efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
void *handle = uga_handle[i];
u32 w, h, depth, refresh;
void *pciio;
status = efi_call_phys3(sys_table->boottime->handle_protocol,
handle, uga_proto, &uga);
if (status != EFI_SUCCESS)
continue;
efi_call_phys3(sys_table->boottime->handle_protocol,
handle, &pciio_proto, &pciio);
status = efi_call_phys5(uga->get_mode, uga, &w, &h,
&depth, &refresh);
if (status == EFI_SUCCESS && (!first_uga || pciio)) {
width = w;
height = h;
/*
* Once we've found a UGA supporting PCIIO,
* don't bother looking any further.
*/
if (pciio)
break;
first_uga = uga;
}
}
if (!first_uga)
goto free_handle;
/* EFI framebuffer */
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_depth = 32;
si->lfb_width = width;
si->lfb_height = height;
si->red_size = 8;
si->red_pos = 16;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 0;
si->rsvd_size = 8;
si->rsvd_pos = 24;
free_handle:
efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
return status;
}
void setup_graphics(struct boot_params *boot_params)
{
efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
struct screen_info *si;
efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
efi_status_t status;
unsigned long size;
void **gop_handle = NULL;
void **uga_handle = NULL;
si = &boot_params->screen_info;
memset(si, 0, sizeof(*si));
size = 0;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
NULL, &size, gop_handle);
if (status == EFI_BUFFER_TOO_SMALL)
status = setup_gop(si, &graphics_proto, size);
if (status != EFI_SUCCESS) {
size = 0;
status = efi_call_phys5(sys_table->boottime->locate_handle,
EFI_LOCATE_BY_PROTOCOL, &uga_proto,
NULL, &size, uga_handle);
if (status == EFI_BUFFER_TOO_SMALL)
setup_uga(si, &uga_proto, size);
}
}
/*
* Because the x86 boot code expects to be passed a boot_params we
* need to create one ourselves (usually the bootloader would create
* one for us).
*/
struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
{
struct boot_params *boot_params;
struct sys_desc_table *sdt;
struct apm_bios_info *bi;
struct setup_header *hdr;
struct efi_info *efi;
efi_loaded_image_t *image;
void *options;
efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
int options_size = 0;
efi_status_t status;
char *cmdline_ptr;
u16 *s2;
u8 *s1;
int i;
unsigned long ramdisk_addr;
unsigned long ramdisk_size;
sys_table = _table;
/* Check if we were booted by the EFI firmware */
if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
return NULL;
status = efi_call_phys3(sys_table->boottime->handle_protocol,
handle, &proto, (void *)&image);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
return NULL;
}
status = efi_low_alloc(sys_table, 0x4000, 1,
(unsigned long *)&boot_params);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
return NULL;
}
memset(boot_params, 0x0, 0x4000);
hdr = &boot_params->hdr;
efi = &boot_params->efi_info;
bi = &boot_params->apm_bios_info;
sdt = &boot_params->sys_desc_table;
/* Copy the second sector to boot_params */
memcpy(&hdr->jump, image->image_base + 512, 512);
/*
* Fill out some of the header fields ourselves because the
* EFI firmware loader doesn't load the first sector.
*/
hdr->root_flags = 1;
hdr->vid_mode = 0xffff;
hdr->boot_flag = 0xAA55;
hdr->code32_start = (__u64)(unsigned long)image->image_base;
hdr->type_of_loader = 0x21;
/* Convert unicode cmdline to ascii */
cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
&options_size);
if (!cmdline_ptr)
goto fail;
hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
hdr->ramdisk_image = 0;
hdr->ramdisk_size = 0;
/* Clear APM BIOS info */
memset(bi, 0, sizeof(*bi));
memset(sdt, 0, sizeof(*sdt));
status = handle_cmdline_files(sys_table, image,
(char *)(unsigned long)hdr->cmd_line_ptr,
"initrd=", hdr->initrd_addr_max,
&ramdisk_addr, &ramdisk_size);
if (status != EFI_SUCCESS)
goto fail2;
hdr->ramdisk_image = ramdisk_addr;
hdr->ramdisk_size = ramdisk_size;
return boot_params;
fail2:
efi_free(sys_table, options_size, hdr->cmd_line_ptr);
fail:
efi_free(sys_table, 0x4000, (unsigned long)boot_params);
return NULL;
}
static void add_e820ext(struct boot_params *params,
struct setup_data *e820ext, u32 nr_entries)
{
struct setup_data *data;
efi_status_t status;
unsigned long size;
e820ext->type = SETUP_E820_EXT;
e820ext->len = nr_entries * sizeof(struct e820entry);
e820ext->next = 0;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;
if (data)
data->next = (unsigned long)e820ext;
else
params->hdr.setup_data = (unsigned long)e820ext;
}
static efi_status_t setup_e820(struct boot_params *params,
struct setup_data *e820ext, u32 e820ext_size)
{
struct e820entry *e820_map = &params->e820_map[0];
struct efi_info *efi = &params->efi_info;
struct e820entry *prev = NULL;
u32 nr_entries;
u32 nr_desc;
int i;
nr_entries = 0;
nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
for (i = 0; i < nr_desc; i++) {
efi_memory_desc_t *d;
unsigned int e820_type = 0;
unsigned long m = efi->efi_memmap;
d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
switch (d->type) {
case EFI_RESERVED_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
case EFI_MEMORY_MAPPED_IO:
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
case EFI_PAL_CODE:
e820_type = E820_RESERVED;
break;
case EFI_UNUSABLE_MEMORY:
e820_type = E820_UNUSABLE;
break;
case EFI_ACPI_RECLAIM_MEMORY:
e820_type = E820_ACPI;
break;
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
e820_type = E820_RAM;
break;
case EFI_ACPI_MEMORY_NVS:
e820_type = E820_NVS;
break;
default:
continue;
}
/* Merge adjacent mappings */
if (prev && prev->type == e820_type &&
(prev->addr + prev->size) == d->phys_addr) {
prev->size += d->num_pages << 12;
continue;
}
if (nr_entries == ARRAY_SIZE(params->e820_map)) {
u32 need = (nr_desc - i) * sizeof(struct e820entry) +
sizeof(struct setup_data);
if (!e820ext || e820ext_size < need)
return EFI_BUFFER_TOO_SMALL;
/* boot_params map full, switch to e820 extended */
e820_map = (struct e820entry *)e820ext->data;
}
e820_map->addr = d->phys_addr;
e820_map->size = d->num_pages << PAGE_SHIFT;
e820_map->type = e820_type;
prev = e820_map++;
nr_entries++;
}
if (nr_entries > ARRAY_SIZE(params->e820_map)) {
u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
add_e820ext(params, e820ext, nr_e820ext);
nr_entries -= nr_e820ext;
}
params->e820_entries = (u8)nr_entries;
return EFI_SUCCESS;
}
static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
u32 *e820ext_size)
{
efi_status_t status;
unsigned long size;
size = sizeof(struct setup_data) +
sizeof(struct e820entry) * nr_desc;
if (*e820ext) {
efi_call_phys1(sys_table->boottime->free_pool, *e820ext);
*e820ext = NULL;
*e820ext_size = 0;
}
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, size, e820ext);
if (status == EFI_SUCCESS)
*e820ext_size = size;
return status;
}
static efi_status_t exit_boot(struct boot_params *boot_params,
void *handle)
{
struct efi_info *efi = &boot_params->efi_info;
unsigned long map_sz, key, desc_size;
efi_memory_desc_t *mem_map;
struct setup_data *e820ext;
__u32 e820ext_size;
__u32 nr_desc, prev_nr_desc;
efi_status_t status;
__u32 desc_version;
bool called_exit = false;
u8 nr_entries;
int i;
nr_desc = 0;
e820ext = NULL;
e820ext_size = 0;
get_map:
status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
&desc_version, &key);
if (status != EFI_SUCCESS)
return status;
prev_nr_desc = nr_desc;
nr_desc = map_sz / desc_size;
if (nr_desc > prev_nr_desc &&
nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
if (status != EFI_SUCCESS)
goto free_mem_map;
efi_call_phys1(sys_table->boottime->free_pool, mem_map);
goto get_map; /* Allocated memory, get map again */
}
memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
efi->efi_systab = (unsigned long)sys_table;
efi->efi_memdesc_size = desc_size;
efi->efi_memdesc_version = desc_version;
efi->efi_memmap = (unsigned long)mem_map;
efi->efi_memmap_size = map_sz;
#ifdef CONFIG_X86_64
efi->efi_systab_hi = (unsigned long)sys_table >> 32;
efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
#endif
/* Might as well exit boot services now */
status = efi_call_phys2(sys_table->boottime->exit_boot_services,
handle, key);
if (status != EFI_SUCCESS) {
/*
* ExitBootServices() will fail if any of the event
* handlers change the memory map. In which case, we
* must be prepared to retry, but only once so that
* we're guaranteed to exit on repeated failures instead
* of spinning forever.
*/
if (called_exit)
goto free_mem_map;
called_exit = true;
efi_call_phys1(sys_table->boottime->free_pool, mem_map);
goto get_map;
}
/* Historic? */
boot_params->alt_mem_k = 32 * 1024;
status = setup_e820(boot_params, e820ext, e820ext_size);
if (status != EFI_SUCCESS)
return status;
return EFI_SUCCESS;
free_mem_map:
efi_call_phys1(sys_table->boottime->free_pool, mem_map);
return status;
}
/*
* On success we return a pointer to a boot_params structure, and NULL
* on failure.
*/
struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
struct boot_params *boot_params)
{
struct desc_ptr *gdt;
efi_loaded_image_t *image;
struct setup_header *hdr = &boot_params->hdr;
efi_status_t status;
struct desc_struct *desc;
sys_table = _table;
/* Check if we were booted by the EFI firmware */
if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
goto fail;
setup_graphics(boot_params);
setup_efi_pci(boot_params);
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, sizeof(*gdt),
(void **)&gdt);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
goto fail;
}
gdt->size = 0x800;
status = efi_low_alloc(sys_table, gdt->size, 8,
(unsigned long *)&gdt->address);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc mem for gdt\n");
goto fail;
}
/*
* If the kernel isn't already loaded at the preferred load
* address, relocate it.
*/
if (hdr->pref_address != hdr->code32_start) {
unsigned long bzimage_addr = hdr->code32_start;
status = efi_relocate_kernel(sys_table, &bzimage_addr,
hdr->init_size, hdr->init_size,
hdr->pref_address,
hdr->kernel_alignment);
if (status != EFI_SUCCESS)
goto fail;
hdr->pref_address = hdr->code32_start;
hdr->code32_start = bzimage_addr;
}
status = exit_boot(boot_params, handle);
if (status != EFI_SUCCESS)
goto fail;
memset((char *)gdt->address, 0x0, gdt->size);
desc = (struct desc_struct *)gdt->address;
/* The first GDT is a dummy and the second is unused. */
desc += 2;
desc->limit0 = 0xffff;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
desc->s = DESC_TYPE_CODE_DATA;
desc->dpl = 0;
desc->p = 1;
desc->limit = 0xf;
desc->avl = 0;
desc->l = 0;
desc->d = SEG_OP_SIZE_32BIT;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
desc++;
desc->limit0 = 0xffff;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
desc->s = DESC_TYPE_CODE_DATA;
desc->dpl = 0;
desc->p = 1;
desc->limit = 0xf;
desc->avl = 0;
desc->l = 0;
desc->d = SEG_OP_SIZE_32BIT;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
#ifdef CONFIG_X86_64
/* Task segment value */
desc++;
desc->limit0 = 0x0000;
desc->base0 = 0x0000;
desc->base1 = 0x0000;
desc->type = SEG_TYPE_TSS;
desc->s = 0;
desc->dpl = 0;
desc->p = 1;
desc->limit = 0x0;
desc->avl = 0;
desc->l = 0;
desc->d = 0;
desc->g = SEG_GRANULARITY_4KB;
desc->base2 = 0x00;
#endif /* CONFIG_X86_64 */
asm volatile("cli");
asm volatile ("lgdt %0" : : "m" (*gdt));
return boot_params;
fail:
return NULL;
}
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