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linux-pinenote/arch/x86/boot/compressed/eboot.c
Roy Franz 876dc36ace efi: Add system table pointer argument to shared functions. 
Add system table pointer argument to shared EFI stub related functions
so they no longer use a global system table pointer as they did when part
of eboot.c.  For the ARM EFI stub this allows us to avoid global
variables completely and thereby not have to deal with GOT fixups.
Not having the EFI stub fixup its GOT, which is shared with the
decompressor, simplifies the relocating of the zImage to a
bootable address.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2013-09-25 12:34:35 +01:00

840 lines
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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;
u32 load_options_size;
efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
int options_size = 0;
efi_status_t status;
unsigned long cmdline;
u16 *s2;
u8 *s1;
int i;
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 = 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 */
options = image->load_options;
load_options_size = image->load_options_size / 2; /* 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(sys_table, options_size, 1,
&cmdline);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc mem for cmdline\n");
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;
/* Clear APM BIOS info */
memset(bi, 0, sizeof(*bi));
memset(sdt, 0, sizeof(*sdt));
status = handle_ramdisks(sys_table, image, hdr);
if (status != EFI_SUCCESS)
goto fail2;
return boot_params;
fail2:
if (options_size)
low_free(sys_table, options_size, hdr->cmd_line_ptr);
fail:
low_free(sys_table, 0x4000, (unsigned long)boot_params);
return NULL;
}
static efi_status_t exit_boot(struct boot_params *boot_params,
void *handle)
{
struct efi_info *efi = &boot_params->efi_info;
struct e820entry *e820_map = &boot_params->e820_map[0];
struct e820entry *prev = NULL;
unsigned long size, key, desc_size, _size;
efi_memory_desc_t *mem_map;
efi_status_t status;
__u32 desc_version;
bool called_exit = false;
u8 nr_entries;
int i;
size = sizeof(*mem_map) * 32;
again:
size += sizeof(*mem_map) * 2;
_size = size;
status = low_alloc(sys_table, size, 1, (unsigned long *)&mem_map);
if (status != EFI_SUCCESS)
return status;
get_map:
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(sys_table, _size, (unsigned long)mem_map);
goto again;
}
if (status != EFI_SUCCESS)
goto free_mem_map;
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 = 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) {
/*
* 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;
goto get_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(sys_table, _size, (unsigned long)mem_map);
return status;
}
static efi_status_t relocate_kernel(struct setup_header *hdr)
{
unsigned long start, nr_pages;
efi_status_t status;
/*
* 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(sys_table, hdr->init_size,
hdr->kernel_alignment, &start);
if (status != EFI_SUCCESS)
efi_printk(sys_table, "Failed to alloc mem for kernel\n");
}
if (status == EFI_SUCCESS)
memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
hdr->init_size);
hdr->pref_address = hdr->code32_start;
hdr->code32_start = (__u32)start;
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, *idt;
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 = 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;
}
status = efi_call_phys3(sys_table->boottime->allocate_pool,
EFI_LOADER_DATA, sizeof(*idt),
(void **)&idt);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "Failed to alloc mem for idt structure\n");
goto fail;
}
idt->size = 0;
idt->address = 0;
/*
* If the kernel isn't already loaded at the preferred load
* address, relocate it.
*/
if (hdr->pref_address != hdr->code32_start) {
status = relocate_kernel(hdr);
if (status != EFI_SUCCESS)
goto fail;
}
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 ("lidt %0" : : "m" (*idt));
asm volatile ("lgdt %0" : : "m" (*gdt));
asm volatile("cli");
return boot_params;
fail:
return NULL;
}
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