diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 7 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/Makefile | 10 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/eboot.c | 1014 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/eboot.h | 60 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/efi_stub_32.S | 86 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/efi_stub_64.S | 1 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_32.S | 22 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 20 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/string.c | 9 | ||||
| -rw-r--r-- | arch/x86/boot/header.S | 158 | ||||
| -rw-r--r-- | arch/x86/boot/string.c | 35 | ||||
| -rw-r--r-- | arch/x86/boot/tools/build.c | 39 | ||||
| -rw-r--r-- | arch/x86/kernel/asm-offsets.c | 2 |
13 files changed, 1462 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index efb42949cc09..d71b656bcb97 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1478,6 +1478,13 @@ config EFI resultant kernel should continue to boot on existing non-EFI platforms. +config EFI_STUB + bool "EFI stub support" + depends on EFI + ---help--- + This kernel feature allows a bzImage to be loaded directly + by EFI firmware without the use of a bootloader. + config SECCOMP def_bool y prompt "Enable seccomp to safely compute untrusted bytecode" diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 09664efb9cee..b123b9a8f5b3 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -23,7 +23,15 @@ LDFLAGS_vmlinux := -T hostprogs-y := mkpiggy -$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/early_serial_console.o $(obj)/piggy.o FORCE +VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ + $(obj)/string.o $(obj)/cmdline.o $(obj)/early_serial_console.o \ + $(obj)/piggy.o + +ifeq ($(CONFIG_EFI_STUB), y) + VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o +endif + +$(obj)/vmlinux: $(VMLINUX_OBJS) FORCE $(call if_changed,ld) @: diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c new file mode 100644 index 000000000000..4055e63d0b04 --- /dev/null +++ b/arch/x86/boot/compressed/eboot.c @@ -0,0 +1,1014 @@ +/* ----------------------------------------------------------------------- + * + * 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 <asm/efi.h> +#include <asm/setup.h> +#include <asm/desc.h> + +#include "eboot.h" + +static efi_system_table_t *sys_table; + +static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size, + unsigned long *desc_size) +{ + efi_memory_desc_t *m = NULL; + efi_status_t status; + unsigned long key; + u32 desc_version; + + *map_size = sizeof(*m) * 32; +again: + /* + * Add an additional efi_memory_desc_t because we're doing an + * allocation which may be in a new descriptor region. + */ + *map_size += sizeof(*m); + status = efi_call_phys3(sys_table->boottime->allocate_pool, + EFI_LOADER_DATA, *map_size, (void **)&m); + if (status != EFI_SUCCESS) + goto fail; + + status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size, + m, &key, desc_size, &desc_version); + if (status == EFI_BUFFER_TOO_SMALL) { + efi_call_phys1(sys_table->boottime->free_pool, m); + goto again; + } + + if (status != EFI_SUCCESS) + efi_call_phys1(sys_table->boottime->free_pool, m); + +fail: + *map = m; + return status; +} + +/* + * Allocate at the highest possible address that is not above 'max'. + */ +static efi_status_t high_alloc(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long max) +{ + unsigned long map_size, desc_size; + efi_memory_desc_t *map; + efi_status_t status; + unsigned long nr_pages; + u64 max_addr = 0; + int i; + + status = __get_map(&map, &map_size, &desc_size); + if (status != EFI_SUCCESS) + goto fail; + + nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; +again: + for (i = 0; i < map_size / desc_size; i++) { + efi_memory_desc_t *desc; + unsigned long m = (unsigned long)map; + u64 start, end; + + desc = (efi_memory_desc_t *)(m + (i * desc_size)); + if (desc->type != EFI_CONVENTIONAL_MEMORY) + continue; + + if (desc->num_pages < nr_pages) + continue; + + start = desc->phys_addr; + end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); + + if ((start + size) > end || (start + size) > max) + continue; + + if (end - size > max) + end = max; + + if (round_down(end - size, align) < start) + continue; + + start = round_down(end - size, align); + + /* + * Don't allocate at 0x0. It will confuse code that + * checks pointers against NULL. + */ + if (start == 0x0) + continue; + + if (start > max_addr) + max_addr = start; + } + + if (!max_addr) + status = EFI_NOT_FOUND; + else { + status = efi_call_phys4(sys_table->boottime->allocate_pages, + EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, + nr_pages, &max_addr); + if (status != EFI_SUCCESS) { + max = max_addr; + max_addr = 0; + goto again; + } + + *addr = max_addr; + } + +free_pool: + efi_call_phys1(sys_table->boottime->free_pool, map); + +fail: + return status; +} + +/* + * Allocate at the lowest possible address. + */ +static efi_status_t low_alloc(unsigned long size, unsigned long align, + unsigned long *addr) +{ + unsigned long map_size, desc_size; + efi_memory_desc_t *map; + efi_status_t status; + unsigned long nr_pages; + int i; + + status = __get_map(&map, &map_size, &desc_size); + if (status != EFI_SUCCESS) + goto fail; + + nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; + for (i = 0; i < map_size / desc_size; i++) { + efi_memory_desc_t *desc; + unsigned long m = (unsigned long)map; + u64 start, end; + + desc = (efi_memory_desc_t *)(m + (i * desc_size)); + + if (desc->type != EFI_CONVENTIONAL_MEMORY) + continue; + + if (desc->num_pages < nr_pages) + continue; + + start = desc->phys_addr; + end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); + + /* + * Don't allocate at 0x0. It will confuse code that + * checks pointers against NULL. Skip the first 8 + * bytes so we start at a nice even number. + */ + if (start == 0x0) + start += 8; + + start = round_up(start, align); + if ((start + size) > end) + continue; + + status = efi_call_phys4(sys_table->boottime->allocate_pages, + EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, + nr_pages, &start); + if (status == EFI_SUCCESS) { + *addr = start; + break; + } + } + + if (i == map_size / desc_size) + status = EFI_NOT_FOUND; + +free_pool: + efi_call_phys1(sys_table->boottime->free_pool, map); +fail: + return status; +} + +static void low_free(unsigned long size, unsigned long addr) +{ + unsigned long nr_pages; + + nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; + efi_call_phys2(sys_table->boottime->free_pages, addr, size); +} + +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; +} + +/* + * 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 pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; + void *pciio; + void *h = gop_handle[i]; + + status = efi_call_phys3(sys_table->boottime->handle_protocol, + h, proto, &gop); + if (status != EFI_SUCCESS) + continue; + + efi_call_phys3(sys_table->boottime->handle_protocol, + h, &pciio_proto, &pciio); + + status = efi_call_phys4(gop->query_mode, gop, + gop->mode->mode, &size, &info); + if (status == EFI_SUCCESS && (!first_gop || pciio)) { + /* + * Apple provide GOPs that are not backed by + * real hardware (they're used to handle + * multiple displays). The workaround is to + * search for a GOP implementing the PCIIO + * protocol, and if one isn't found, to just + * fallback 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 PCIIO, + * don't bother looking any further. + */ + if (pciio) + break; + + first_gop = gop; + } + } + + /* 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->lfb_size = fb_size; + 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; + } + +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); + } +} + +struct initrd { + efi_file_handle_t *handle; + u64 size; +}; + +/* + * Check the cmdline for a LILO-style initrd= arguments. + * + * We only support loading an initrd from the same filesystem as the + * kernel image. + */ +static efi_status_t handle_ramdisks(efi_loaded_image_t *image, + struct setup_header *hdr) +{ + struct initrd *initrds; + unsigned long initrd_addr; + efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; + u64 initrd_total; + efi_file_io_interface_t *io; + efi_file_handle_t *fh; + efi_status_t status; + int nr_initrds; + char *str; + int i, j, k; + + initrd_addr = 0; + initrd_total = 0; + + str = (char *)(unsigned long)hdr->cmd_line_ptr; + + j = 0; /* See close_handles */ + + if (!str || !*str) + return EFI_SUCCESS; + + for (nr_initrds = 0; *str; nr_initrds++) { + str = strstr(str, "initrd="); + if (!str) + break; + + str += 7; + + /* Skip any leading slashes */ + while (*str == '/' || *str == '\\') + str++; + + while (*str && *str != ' ' && *str != '\n') + str++; + } + + if (!nr_initrds) + return EFI_SUCCESS; + + status = efi_call_phys3(sys_table->boottime->allocate_pool, + EFI_LOADER_DATA, + nr_initrds * sizeof(*initrds), + &initrds); + if (status != EFI_SUCCESS) + goto fail; + + str = (char *)(unsigned long)hdr->cmd_line_ptr; + for (i = 0; i < nr_initrds; i++) { + struct initrd *initrd; + efi_file_handle_t *h; + efi_file_info_t *info; + efi_char16_t filename[256]; + unsigned long info_sz; + efi_guid_t info_guid = EFI_FILE_INFO_ID; + efi_char16_t *p; + u64 file_sz; + + str = strstr(str, "initrd="); + if (!str) + break; + + str += 7; + + initrd = &initrds[i]; + p = filename; + + /* Skip any leading slashes */ + while (*str == '/' || *str == '\\') + str++; + + while (*str && *str != ' ' && *str != '\n') { + if (p >= filename + sizeof(filename)) + break; + + *p++ = *str++; + } + + *p = '\0'; + + /* Only open the volume once. */ + if (!i) { + efi_boot_services_t *boottime; + + boottime = sys_table->boottime; + + status = efi_call_phys3(boottime->handle_protocol, + image->device_handle, &fs_proto, &io); + if (status != EFI_SUCCESS) + goto free_initrds; + + status = efi_call_phys2(io->open_volume, io, &fh); + if (status != EFI_SUCCESS) + goto free_initrds; + } + + status = efi_call_phys5(fh->open, fh, &h, filename, + EFI_FILE_MODE_READ, (u64)0); + if (status != EFI_SUCCESS) + goto close_handles; + + initrd->handle = h; + + info_sz = 0; + status = efi_call_phys4(h->get_info, h, &info_guid, + &info_sz, NULL); + if (status != EFI_BUFFER_TOO_SMALL) + goto close_handles; + +grow: + status = efi_call_phys3(sys_table->boottime->allocate_pool, + EFI_LOADER_DATA, info_sz, &info); + if (status != EFI_SUCCESS) + goto close_handles; + + status = efi_call_phys4(h->get_info, h, &info_guid, + &info_sz, info); + if (status == EFI_BUFFER_TOO_SMALL) { + efi_call_phys1(sys_table->boottime->free_pool, info); + goto grow; + } + + file_sz = info->file_size; + efi_call_phys1(sys_table->boottime->free_pool, info); + + if (status != EFI_SUCCESS) + goto close_handles; + + initrd->size = file_sz; + initrd_total += file_sz; + } + + if (initrd_total) { + unsigned long addr; + + /* + * Multiple initrd's need to be at consecutive + * addresses in memory, so allocate enough memory for + * all the initrd's. + */ + status = high_alloc(initrd_total, 0x1000, + &initrd_addr, hdr->initrd_addr_max); + if (status != EFI_SUCCESS) + goto close_handles; + + /* We've run out of free low memory. */ + if (initrd_addr > hdr->initrd_addr_max) { + status = EFI_INVALID_PARAMETER; + goto free_initrd_total; + } + + addr = initrd_addr; + for (j = 0; j < nr_initrds; j++) { + u64 size; + + size = initrds[j].size; + status = efi_call_phys3(fh->read, initrds[j].handle, + &size, addr); + if (status != EFI_SUCCESS) + goto free_initrd_total; + + efi_call_phys1(fh->close, initrds[j].handle); + + addr += size; + } + + } + + efi_call_phys1(sys_table->boottime->free_pool, initrds); + + hdr->ramdisk_image = initrd_addr; + hdr->ramdisk_size = initrd_total; + + return status; + +free_initrd_total: + low_free(initrd_total, initrd_addr); + +close_handles: + for (k = j; k < nr_initrds; k++) + efi_call_phys1(fh->close, initrds[k].handle); +free_initrds: + efi_call_phys1(sys_table->boottime->free_pool, initrds); +fail: + hdr->ramdisk_image = 0; + hdr->ramdisk_size = 0; + + return status; +} + +/* + * 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). + */ +static efi_status_t make_boot_params(struct boot_params *boot_params, + efi_loaded_image_t *image, + void *handle) +{ + struct efi_info *efi = &boot_params->efi_info; + struct apm_bios_info *bi = &boot_params->apm_bios_info; + struct sys_desc_table *sdt = &boot_params->sys_desc_table; + struct e820entry *e820_map = &boot_params->e820_map[0]; + struct e820entry *prev = NULL; + struct setup_header *hdr = &boot_params->hdr; + unsigned long size, key, desc_size, _size; + efi_memory_desc_t *mem_map; + void *options = image->load_options; + u32 load_options_size = image->load_options_size / 2; /* ASCII */ + int options_size = 0; + efi_status_t status; + __u32 desc_version; + unsigned long cmdline; + u8 nr_entries; + u16 *s2; + u8 *s1; + int i; + + hdr->type_of_loader = 0x21; + + /* Convert unicode cmdline to ascii */ + cmdline = 0; + s2 = (u16 *)options; + + if (s2) { + while (*s2 && *s2 != '\n' && options_size < load_options_size) { + s2++; + options_size++; + } + + if (options_size) { + if (options_size > hdr->cmdline_size) + options_size = hdr->cmdline_size; + + options_size++; /* NUL termination */ + + status = low_alloc(options_size, 1, &cmdline); + if (status != EFI_SUCCESS) + goto fail; + + s1 = (u8 *)(unsigned long)cmdline; + s2 = (u16 *)options; + + for (i = 0; i < options_size - 1; i++) + *s1++ = *s2++; + + *s1 = '\0'; + } + } + + hdr->cmd_line_ptr = cmdline; + + hdr->ramdisk_image = 0; + hdr->ramdisk_size = 0; + + status = handle_ramdisks(image, hdr); + if (status != EFI_SUCCESS) + goto free_cmdline; + + setup_graphics(boot_params); + + /* Clear APM BIOS info */ + memset(bi, 0, sizeof(*bi)); + + memset(sdt, 0, sizeof(*sdt)); + + memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32)); + + size = sizeof(*mem_map) * 32; + +again: + size += sizeof(*mem_map); + _size = size; + status = low_alloc(size, 1, (unsigned long *)&mem_map); + if (status != EFI_SUCCESS) + goto free_cmdline; + + status = efi_call_phys5(sys_table->boottime->get_memory_map, &size, + mem_map, &key, &desc_size, &desc_version); + if (status == EFI_BUFFER_TOO_SMALL) { + low_free(_size, (unsigned long)mem_map); + goto again; + } + + if (status != EFI_SUCCESS) + goto free_mem_map; + + 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 = size; + +#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) + goto free_mem_map; + + /* Historic? */ + boot_params->alt_mem_k = 32 * 1024; + + /* + * Convert the EFI memory map to E820. + */ + nr_entries = 0; + for (i = 0; i < size / desc_size; i++) { + efi_memory_desc_t *d; + unsigned int e820_type = 0; + unsigned long m = (unsigned long)mem_map; + + d = (efi_memory_desc_t *)(m + (i * desc_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; + else { + e820_map->addr = d->phys_addr; + e820_map->size = d->num_pages << 12; + e820_map->type = e820_type; + prev = e820_map++; + nr_entries++; + } + } + + boot_params->e820_entries = nr_entries; + + return EFI_SUCCESS; + +free_mem_map: + low_free(_size, (unsigned long)mem_map); +free_cmdline: + if (options_size) + low_free(options_size, hdr->cmd_line_ptr); +fail: + 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; + unsigned long start, nr_pages; + struct desc_ptr *gdt, *idt; + efi_loaded_image_t *image; + struct setup_header *hdr; + efi_status_t status; + efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; + 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; + + status = efi_call_phys3(sys_table->boottime->handle_protocol, + handle, &proto, (void *)&image); + if (status != EFI_SUCCESS) + goto fail; + + status = low_alloc(0x4000, 1, (unsigned long *)&boot_params); + if (status != EFI_SUCCESS) + goto fail; + + memset(boot_params, 0x0, 0x4000); + + /* Copy first two sectors to boot_params */ + memcpy(boot_params, image->image_base, 1024); + + hdr = &boot_params->hdr; + + /* + * The EFI firmware loader could have placed the kernel image + * anywhere in memory, but the kernel has various restrictions + * on the max physical address it can run at. Attempt to move + * the kernel to boot_params.pref_address, or as low as + * possible. + */ + start = hdr->pref_address; + nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; + + status = efi_call_phys4(sys_table->boottime->allocate_pages, + EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, + nr_pages, &start); + if (status != EFI_SUCCESS) { + status = low_alloc(hdr->init_size, hdr->kernel_alignment, + &start); + if (status != EFI_SUCCESS) + goto fail; + } + + hdr->code32_start = (__u32)start; + hdr->pref_address = (__u64)(unsigned long)image->image_base; + + memcpy((void *)start, image->image_base, image->image_size); + + status = efi_call_phys3(sys_table->boottime->allocate_pool, + EFI_LOADER_DATA, sizeof(*gdt), + (void **)&gdt); + if (status != EFI_SUCCESS) + goto fail; + + gdt->size = 0x800; + status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address); + if (status != EFI_SUCCESS) + goto fail; + + status = efi_call_phys3(sys_table->boottime->allocate_pool, + EFI_LOADER_DATA, sizeof(*idt), + (void **)&idt); + if (status != EFI_SUCCESS) + goto fail; + + idt->size = 0; + idt->address = 0; + + status = make_boot_params(boot_params, image, 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 ("lidt %0" : : "m" (*idt)); + asm volatile ("lgdt %0" : : "m" (*gdt)); + + asm volatile("cli"); + + return boot_params; +fail: + return NULL; +} diff --git a/arch/x86/boot/compressed/eboot.h b/arch/x86/boot/compressed/eboot.h new file mode 100644 index 000000000000..f66d023e91ef --- /dev/null +++ b/arch/x86/boot/compressed/eboot.h @@ -0,0 +1,60 @@ +#ifndef BOOT_COMPRESSED_EBOOT_H +#define BOOT_COMPRESSED_EBOOT_H + +#define SEG_TYPE_DATA (0 << 3) +#define SEG_TYPE_READ_WRITE (1 << 1) +#define SEG_TYPE_CODE (1 << 3) +#define SEG_TYPE_EXEC_READ (1 << 1) +#define SEG_TYPE_TSS ((1 << 3) | (1 << 0)) +#define SEG_OP_SIZE_32BIT (1 << 0) +#define SEG_GRANULARITY_4KB (1 << 0) + +#define DESC_TYPE_CODE_DATA (1 << 0) + +#define EFI_PAGE_SIZE (1UL << EFI_PAGE_SHIFT) + +#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0 +#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1 +#define PIXEL_BIT_MASK 2 +#define PIXEL_BLT_ONLY 3 +#define PIXEL_FORMAT_MAX 4 + +struct efi_pixel_bitmask { + u32 red_mask; + u32 green_mask; + u32 blue_mask; + u32 reserved_mask; +}; + +struct efi_graphics_output_mode_info { + u32 version; + u32 horizontal_resolution; + u32 vertical_resolution; + int pixel_format; + struct efi_pixel_bitmask pixel_information; + u32 pixels_per_scan_line; +} __packed; + +struct efi_graphics_output_protocol_mode { + u32 max_mode; + u32 mode; + unsigned long info; + unsigned long size_of_info; + u64 frame_buffer_base; + unsigned long frame_buffer_size; +} __packed; + +struct efi_graphics_output_protocol { + void *query_mode; + unsigned long set_mode; + unsigned long blt; + struct efi_graphics_output_protocol_mode *mode; +}; + +struct efi_uga_draw_protocol { + void *get_mode; + void *set_mode; + void *blt; +}; + +#endif /* BOOT_COMPRESSED_EBOOT_H */ diff --git a/arch/x86/boot/compressed/efi_stub_32.S b/arch/x86/boot/compressed/efi_stub_32.S new file mode 100644 index 000000000000..a53440e81d52 --- /dev/null +++ b/arch/x86/boot/compressed/efi_stub_32.S @@ -0,0 +1,86 @@ +/* + * EFI call stub for IA32. + * + * This stub allows us to make EFI calls in physical mode with interrupts + * turned off. Note that this implementation is different from the one in + * arch/x86/platform/efi/efi_stub_32.S because we're _already_ in physical + * mode at this point. + */ + +#include <linux/linkage.h> +#include <asm/page_types.h> + +/* + * efi_call_phys(void *, ...) is a function with variable parameters. + * All the callers of this function assure that all the parameters are 4-bytes. + */ + +/* + * In gcc calling convention, EBX, ESP, EBP, ESI and EDI are all callee save. + * So we'd better save all of them at the beginning of this function and restore + * at the end no matter how many we use, because we can not assure EFI runtime + * service functions will comply with gcc calling convention, too. + */ + +.text +ENTRY(efi_call_phys) + /* + * 0. The function can only be called in Linux kernel. So CS has been + * set to 0x0010, DS and SS have been set to 0x0018. In EFI, I found + * the values of these registers are the same. And, the corresponding + * GDT entries are identical. So I will do nothing about segment reg + * and GDT, but change GDT base register in prelog and epilog. + */ + + /* + * 1. Because we haven't been relocated by this point we need to + * use relative addressing. + */ + call 1f +1: popl %edx + subl $1b, %edx + + /* + * 2. Now on the top of stack is the return + * address in the caller of efi_call_phys(), then parameter 1, + * parameter 2, ..., param n. To make things easy, we save the return + * address of efi_call_phys in a global variable. + */ + popl %ecx + movl %ecx, saved_return_addr(%edx) + /* get the function pointer into ECX*/ + popl %ecx + movl %ecx, efi_rt_function_ptr(%edx) + + /* + * 3. Call the physical function. + */ + call *%ecx + + /* + * 4. Balance the stack. And because EAX contain the return value, + * we'd better not clobber it. We need to calculate our address + * again because %ecx and %edx are not preserved across EFI function + * calls. + */ + call 1f +1: popl %edx + subl $1b, %edx + + movl efi_rt_function_ptr(%edx), %ecx + pushl %ecx + + /* + * 10. Push the saved return address onto the stack and return. + */ + movl saved_return_addr(%edx), %ecx + pushl %ecx + ret +ENDPROC(efi_call_phys) +.previous + +.data +saved_return_addr: + .long 0 +efi_rt_function_ptr: + .long 0 diff --git a/arch/x86/boot/compressed/efi_stub_64.S b/arch/x86/boot/compressed/efi_stub_64.S new file mode 100644 index 000000000000..cedc60de86eb --- /dev/null +++ b/arch/x86/boot/compressed/efi_stub_64.S @@ -0,0 +1 @@ +#include "../../platform/efi/efi_stub_64.S" diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S index 67a655a39ce4..a0559930a180 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -32,6 +32,28 @@ __HEAD ENTRY(startup_32) +#ifdef CONFIG_EFI_STUB + /* + * We don't need the return address, so set up the stack so + * efi_main() can find its arugments. + */ + add $0x4, %esp + + call efi_main + cmpl $0, %eax + je preferred_addr + movl %eax, %esi + call 1f +1: + popl %eax + subl $1b, %eax + subl BP_pref_address(%esi), %eax + add BP_code32_start(%esi), %eax + leal preferred_addr(%eax), %eax + jmp *%eax + +preferred_addr: +#endif cld /* * Test KEEP_SEGMENTS flag to see if the bootloader is asking diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 35af09d13dc1..558d76ce23bc 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -199,6 +199,26 @@ ENTRY(startup_64) * an identity mapped page table being provied that maps our * entire text+data+bss and hopefully all of memory. */ +#ifdef CONFIG_EFI_STUB + pushq %rsi + mov %rcx, %rdi + mov %rdx, %rsi + call efi_main + popq %rsi + cmpq $0,%rax + je preferred_addr + movq %rax,%rsi + call 1f +1: + popq %rax + subq $1b, %rax + subq BP_pref_address(%rsi), %rax + add BP_code32_start(%esi), %eax + leaq preferred_addr(%rax), %rax + jmp *%rax + +preferred_addr: +#endif /* Setup data segments. */ xorl %eax, %eax diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c index 19b3e693cd72..ffb9c5c9d748 100644 --- a/arch/x86/boot/compressed/string.c +++ b/arch/x86/boot/compressed/string.c @@ -1,2 +1,11 @@ #include "misc.h" + +int memcmp(const void *s1, const void *s2, size_t len) +{ + u8 diff; + asm("repe; cmpsb; setnz %0" + : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); + return diff; +} + #include "../string.c" diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index bdb4d458ec8c..f1bbeeb09148 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -45,6 +45,11 @@ SYSSEG = 0x1000 /* historical load address >> 4 */ .global bootsect_start bootsect_start: +#ifdef CONFIG_EFI_STUB + # "MZ", MS-DOS header + .byte 0x4d + .byte 0x5a +#endif # Normalize the start address ljmp $BOOTSEG, $start2 @@ -79,6 +84,14 @@ bs_die: # invoke the BIOS reset code... ljmp $0xf000,$0xfff0 +#ifdef CONFIG_EFI_STUB + .org 0x3c + # + # Offset to the PE header. + # + .long pe_header +#endif /* CONFIG_EFI_STUB */ + .section ".bsdata", "a" bugger_off_msg: .ascii "Direct booting from floppy is no longer supported.\r\n" @@ -87,6 +100,141 @@ bugger_off_msg: .ascii "Remove disk and press any key to reboot . . .\r\n" .byte 0 +#ifdef CONFIG_EFI_STUB +pe_header: + .ascii "PE" + .word 0 + +coff_header: +#ifdef CONFIG_X86_32 + .word 0x14c # i386 +#else + .word 0x8664 # x86-64 +#endif + .word 2 # nr_sections + .long 0 # TimeDateStamp + .long 0 # PointerToSymbolTable + .long 1 # NumberOfSymbols + .word section_table - optional_header # SizeOfOptionalHeader +#ifdef CONFIG_X86_32 + .word 0x306 # Characteristics. + # IMAGE_FILE_32BIT_MACHINE | + # IMAGE_FILE_DEBUG_STRIPPED | + # IMAGE_FILE_EXECUTABLE_IMAGE | + # IMAGE_FILE_LINE_NUMS_STRIPPED +#else + .word 0x206 # Characteristics + # IMAGE_FILE_DEBUG_STRIPPED | + # IMAGE_FILE_EXECUTABLE_IMAGE | + # IMAGE_FILE_LINE_NUMS_STRIPPED +#endif + +optional_header: +#ifdef CONFIG_X86_32 + .word 0x10b # PE32 format +#else + .word 0x20b # PE32+ format +#endif + .byte 0x02 # MajorLinkerVersion + .byte 0x14 # MinorLinkerVersion + + # Filled in by build.c + .long 0 # SizeOfCode + + .long 0 # SizeOfInitializedData + .long 0 # SizeOfUninitializedData + + # Filled in by build.c + .long 0x0000 # AddressOfEntryPoint + + .long 0x0000 # BaseOfCode +#ifdef CONFIG_X86_32 + .long 0 # data +#endif + +extra_header_fields: +#ifdef CONFIG_X86_32 + .long 0 # ImageBase +#else + .quad 0 # ImageBase +#endif + .long 0x1000 # SectionAlignment + .long 0x200 # FileAlignment + .word 0 # MajorOperatingSystemVersion + .word 0 # MinorOperatingSystemVersion + .word 0 # MajorImageVersion + .word 0 # MinorImageVersion + .word 0 # MajorSubsystemVersion + .word 0 # MinorSubsystemVersion + .long 0 # Win32VersionValue + + # + # The size of the bzImage is written in tools/build.c + # + .long 0 # SizeOfImage + + .long 0x200 # SizeOfHeaders + .long 0 # CheckSum + .word 0xa # Subsystem (EFI application) + .word 0 # DllCharacteristics +#ifdef CONFIG_X86_32 + .long 0 # SizeOfStackReserve + .long 0 # SizeOfStackCommit + .long 0 # SizeOfHeapReserve + .long 0 # SizeOfHeapCommit +#else + .quad 0 # SizeOfStackReserve + .quad 0 # SizeOfStackCommit + .quad 0 # SizeOfHeapReserve + .quad 0 # SizeOfHeapCommit +#endif + .long 0 # LoaderFlags + .long 0x1 # NumberOfRvaAndSizes + + .quad 0 # ExportTable + .quad 0 # ImportTable + .quad 0 # ResourceTable + .quad 0 # ExceptionTable + .quad 0 # CertificationTable + .quad 0 # BaseRelocationTable + + # Section table +section_table: + .ascii ".text" + .byte 0 + .byte 0 + .byte 0 + .long 0 + .long 0x0 # startup_{32,64} + .long 0 # Size of initialized data + # on disk + .long 0x0 # startup_{32,64} + .long 0 # PointerToRelocations + .long 0 # PointerToLineNumbers + .word 0 # NumberOfRelocations + .word 0 # NumberOfLineNumbers + .long 0x60500020 # Characteristics (section flags) + + # + # The EFI application loader requires a relocation section + # because EFI applications are relocatable and not having + # this section seems to confuse it. But since we don't need + # the loader to fixup any relocs for us just fill it with a + # single dummy reloc. + # + .ascii ".reloc" + .byte 0 + .byte 0 + .long reloc_end - reloc_start + .long reloc_start + .long reloc_end - reloc_start # SizeOfRawData + .long reloc_start # PointerToRawData + .long 0 # PointerToRelocations + .long 0 # PointerToLineNumbers + .word 0 # NumberOfRelocations + .word 0 # NumberOfLineNumbers + .long 0x42100040 # Characteristics (section flags) +#endif /* CONFIG_EFI_STUB */ # Kernel attributes; used by setup. This is part 1 of the # header, from the old boot sector. @@ -318,3 +466,13 @@ die: setup_corrupt: .byte 7 .string "No setup signature found...\n" + + .data +dummy: .long 0 + + .section .reloc +reloc_start: + .long dummy - reloc_start + .long 10 + .word 0 +reloc_end: diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c index 3cbc4058dd26..574dedfe2890 100644 --- a/arch/x86/boot/string.c +++ b/arch/x86/boot/string.c @@ -111,3 +111,38 @@ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int bas return result; } + +/** + * strlen - Find the length of a string + * @s: The string to be sized + */ +size_t strlen(const char *s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; ++sc) + /* nothing */; + return sc - s; +} + +/** + * strstr - Find the first substring in a %NUL terminated string + * @s1: The string to be searched + * @s2: The string to search for + */ +char *strstr(const char *s1, const char *s2) +{ + size_t l1, l2; + + l2 = strlen(s2); + if (!l2) + return (char *)s1; + l1 = strlen(s1); + while (l1 >= l2) { + l1--; + if (!memcmp(s1, s2, l2)) + return (char *)s1; + s1++; + } + return NULL; +} diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c index fdc60a0b3c20..4e9bd6bcafa6 100644 --- a/arch/x86/boot/tools/build.c +++ b/arch/x86/boot/tools/build.c @@ -135,6 +135,9 @@ static void usage(void) int main(int argc, char ** argv) { +#ifdef CONFIG_EFI_STUB + unsigned int file_sz, pe_header; +#endif unsigned int i, sz, setup_sectors; int c; u32 sys_size; @@ -194,6 +197,42 @@ int main(int argc, char ** argv) buf[0x1f6] = sys_size >> 16; buf[0x1f7] = sys_size >> 24; +#ifdef CONFIG_EFI_STUB + file_sz = sz + i + ((sys_size * 16) - sz); + + pe_header = *(unsigned int *)&buf[0x3c]; + + /* Size of code */ + *(unsigned int *)&buf[pe_header + 0x1c] = file_sz; + + /* Size of image */ + *(unsigned int *)&buf[pe_header + 0x50] = file_sz; + +#ifdef CONFIG_X86_32 + /* Address of entry point */ + *(unsigned int *)&buf[pe_header + 0x28] = i; + + /* .text size */ + *(unsigned int *)&buf[pe_header + 0xb0] = file_sz; + + /* .text size of initialised data */ + *(unsigned int *)&buf[pe_header + 0xb8] = file_sz; +#else + /* + * Address of entry point. startup_32 is at the beginning and + * the 64-bit entry point (startup_64) is always 512 bytes + * after. + */ + *(unsigned int *)&buf[pe_header + 0x28] = i + 512; + + /* .text size */ + *(unsigned int *)&buf[pe_header + 0xc0] = file_sz; + + /* .text size of initialised data */ + *(unsigned int *)&buf[pe_header + 0xc8] = file_sz; +#endif /* CONFIG_X86_32 */ +#endif /* CONFIG_EFI_STUB */ + crc = partial_crc32(buf, i, crc); if (fwrite(buf, 1, i, stdout) != i) die("Writing setup failed"); diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c index 4f13fafc5264..68de2dc962ec 100644 --- a/arch/x86/kernel/asm-offsets.c +++ b/arch/x86/kernel/asm-offsets.c @@ -67,4 +67,6 @@ void common(void) { OFFSET(BP_hardware_subarch, boot_params, hdr.hardware_subarch); OFFSET(BP_version, boot_params, hdr.version); OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment); + OFFSET(BP_pref_address, boot_params, hdr.pref_address); + OFFSET(BP_code32_start, boot_params, hdr.code32_start); } |