forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
367 lines
9.4 KiB
367 lines
9.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Extensible Firmware Interface |
|
* |
|
* Based on Extensible Firmware Interface Specification version 2.4 |
|
* |
|
* Copyright (C) 2013 - 2015 Linaro Ltd. |
|
*/ |
|
|
|
#define pr_fmt(fmt) "efi: " fmt |
|
|
|
#include <linux/efi.h> |
|
#include <linux/fwnode.h> |
|
#include <linux/init.h> |
|
#include <linux/memblock.h> |
|
#include <linux/mm_types.h> |
|
#include <linux/of.h> |
|
#include <linux/of_address.h> |
|
#include <linux/of_fdt.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/screen_info.h> |
|
|
|
#include <asm/efi.h> |
|
|
|
static int __init is_memory(efi_memory_desc_t *md) |
|
{ |
|
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC)) |
|
return 1; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Translate a EFI virtual address into a physical address: this is necessary, |
|
* as some data members of the EFI system table are virtually remapped after |
|
* SetVirtualAddressMap() has been called. |
|
*/ |
|
static phys_addr_t __init efi_to_phys(unsigned long addr) |
|
{ |
|
efi_memory_desc_t *md; |
|
|
|
for_each_efi_memory_desc(md) { |
|
if (!(md->attribute & EFI_MEMORY_RUNTIME)) |
|
continue; |
|
if (md->virt_addr == 0) |
|
/* no virtual mapping has been installed by the stub */ |
|
break; |
|
if (md->virt_addr <= addr && |
|
(addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) |
|
return md->phys_addr + addr - md->virt_addr; |
|
} |
|
return addr; |
|
} |
|
|
|
static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR; |
|
static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR; |
|
|
|
static const efi_config_table_type_t arch_tables[] __initconst = { |
|
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table}, |
|
{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table}, |
|
{} |
|
}; |
|
|
|
static void __init init_screen_info(void) |
|
{ |
|
struct screen_info *si; |
|
|
|
if (IS_ENABLED(CONFIG_ARM) && |
|
screen_info_table != EFI_INVALID_TABLE_ADDR) { |
|
si = early_memremap_ro(screen_info_table, sizeof(*si)); |
|
if (!si) { |
|
pr_err("Could not map screen_info config table\n"); |
|
return; |
|
} |
|
screen_info = *si; |
|
early_memunmap(si, sizeof(*si)); |
|
|
|
/* dummycon on ARM needs non-zero values for columns/lines */ |
|
screen_info.orig_video_cols = 80; |
|
screen_info.orig_video_lines = 25; |
|
} |
|
|
|
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && |
|
memblock_is_map_memory(screen_info.lfb_base)) |
|
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); |
|
} |
|
|
|
static int __init uefi_init(u64 efi_system_table) |
|
{ |
|
efi_config_table_t *config_tables; |
|
efi_system_table_t *systab; |
|
size_t table_size; |
|
int retval; |
|
|
|
systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t)); |
|
if (systab == NULL) { |
|
pr_warn("Unable to map EFI system table.\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
set_bit(EFI_BOOT, &efi.flags); |
|
if (IS_ENABLED(CONFIG_64BIT)) |
|
set_bit(EFI_64BIT, &efi.flags); |
|
|
|
retval = efi_systab_check_header(&systab->hdr, 2); |
|
if (retval) |
|
goto out; |
|
|
|
efi.runtime = systab->runtime; |
|
efi.runtime_version = systab->hdr.revision; |
|
|
|
efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor)); |
|
|
|
table_size = sizeof(efi_config_table_t) * systab->nr_tables; |
|
config_tables = early_memremap_ro(efi_to_phys(systab->tables), |
|
table_size); |
|
if (config_tables == NULL) { |
|
pr_warn("Unable to map EFI config table array.\n"); |
|
retval = -ENOMEM; |
|
goto out; |
|
} |
|
retval = efi_config_parse_tables(config_tables, systab->nr_tables, |
|
IS_ENABLED(CONFIG_ARM) ? arch_tables |
|
: NULL); |
|
|
|
early_memunmap(config_tables, table_size); |
|
out: |
|
early_memunmap(systab, sizeof(efi_system_table_t)); |
|
return retval; |
|
} |
|
|
|
/* |
|
* Return true for regions that can be used as System RAM. |
|
*/ |
|
static __init int is_usable_memory(efi_memory_desc_t *md) |
|
{ |
|
switch (md->type) { |
|
case EFI_LOADER_CODE: |
|
case EFI_LOADER_DATA: |
|
case EFI_ACPI_RECLAIM_MEMORY: |
|
case EFI_BOOT_SERVICES_CODE: |
|
case EFI_BOOT_SERVICES_DATA: |
|
case EFI_CONVENTIONAL_MEMORY: |
|
case EFI_PERSISTENT_MEMORY: |
|
/* |
|
* Special purpose memory is 'soft reserved', which means it |
|
* is set aside initially, but can be hotplugged back in or |
|
* be assigned to the dax driver after boot. |
|
*/ |
|
if (efi_soft_reserve_enabled() && |
|
(md->attribute & EFI_MEMORY_SP)) |
|
return false; |
|
|
|
/* |
|
* According to the spec, these regions are no longer reserved |
|
* after calling ExitBootServices(). However, we can only use |
|
* them as System RAM if they can be mapped writeback cacheable. |
|
*/ |
|
return (md->attribute & EFI_MEMORY_WB); |
|
default: |
|
break; |
|
} |
|
return false; |
|
} |
|
|
|
static __init void reserve_regions(void) |
|
{ |
|
efi_memory_desc_t *md; |
|
u64 paddr, npages, size; |
|
|
|
if (efi_enabled(EFI_DBG)) |
|
pr_info("Processing EFI memory map:\n"); |
|
|
|
/* |
|
* Discard memblocks discovered so far: if there are any at this |
|
* point, they originate from memory nodes in the DT, and UEFI |
|
* uses its own memory map instead. |
|
*/ |
|
memblock_dump_all(); |
|
memblock_remove(0, PHYS_ADDR_MAX); |
|
|
|
for_each_efi_memory_desc(md) { |
|
paddr = md->phys_addr; |
|
npages = md->num_pages; |
|
|
|
if (efi_enabled(EFI_DBG)) { |
|
char buf[64]; |
|
|
|
pr_info(" 0x%012llx-0x%012llx %s\n", |
|
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, |
|
efi_md_typeattr_format(buf, sizeof(buf), md)); |
|
} |
|
|
|
memrange_efi_to_native(&paddr, &npages); |
|
size = npages << PAGE_SHIFT; |
|
|
|
if (is_memory(md)) { |
|
early_init_dt_add_memory_arch(paddr, size); |
|
|
|
if (!is_usable_memory(md)) |
|
memblock_mark_nomap(paddr, size); |
|
|
|
/* keep ACPI reclaim memory intact for kexec etc. */ |
|
if (md->type == EFI_ACPI_RECLAIM_MEMORY) |
|
memblock_reserve(paddr, size); |
|
} |
|
} |
|
} |
|
|
|
void __init efi_init(void) |
|
{ |
|
struct efi_memory_map_data data; |
|
u64 efi_system_table; |
|
|
|
/* Grab UEFI information placed in FDT by stub */ |
|
efi_system_table = efi_get_fdt_params(&data); |
|
if (!efi_system_table) |
|
return; |
|
|
|
if (efi_memmap_init_early(&data) < 0) { |
|
/* |
|
* If we are booting via UEFI, the UEFI memory map is the only |
|
* description of memory we have, so there is little point in |
|
* proceeding if we cannot access it. |
|
*/ |
|
panic("Unable to map EFI memory map.\n"); |
|
} |
|
|
|
WARN(efi.memmap.desc_version != 1, |
|
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld", |
|
efi.memmap.desc_version); |
|
|
|
if (uefi_init(efi_system_table) < 0) { |
|
efi_memmap_unmap(); |
|
return; |
|
} |
|
|
|
reserve_regions(); |
|
efi_esrt_init(); |
|
efi_mokvar_table_init(); |
|
|
|
memblock_reserve(data.phys_map & PAGE_MASK, |
|
PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK))); |
|
|
|
init_screen_info(); |
|
|
|
#ifdef CONFIG_ARM |
|
/* ARM does not permit early mappings to persist across paging_init() */ |
|
efi_memmap_unmap(); |
|
|
|
if (cpu_state_table != EFI_INVALID_TABLE_ADDR) { |
|
struct efi_arm_entry_state *state; |
|
bool dump_state = true; |
|
|
|
state = early_memremap_ro(cpu_state_table, |
|
sizeof(struct efi_arm_entry_state)); |
|
if (state == NULL) { |
|
pr_warn("Unable to map CPU entry state table.\n"); |
|
return; |
|
} |
|
|
|
if ((state->sctlr_before_ebs & 1) == 0) |
|
pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n"); |
|
else if ((state->sctlr_after_ebs & 1) == 0) |
|
pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n"); |
|
else |
|
dump_state = false; |
|
|
|
if (dump_state || efi_enabled(EFI_DBG)) { |
|
pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs); |
|
pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs); |
|
pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs); |
|
pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs); |
|
} |
|
early_memunmap(state, sizeof(struct efi_arm_entry_state)); |
|
} |
|
#endif |
|
} |
|
|
|
static bool efifb_overlaps_pci_range(const struct of_pci_range *range) |
|
{ |
|
u64 fb_base = screen_info.lfb_base; |
|
|
|
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) |
|
fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32; |
|
|
|
return fb_base >= range->cpu_addr && |
|
fb_base < (range->cpu_addr + range->size); |
|
} |
|
|
|
static struct device_node *find_pci_overlap_node(void) |
|
{ |
|
struct device_node *np; |
|
|
|
for_each_node_by_type(np, "pci") { |
|
struct of_pci_range_parser parser; |
|
struct of_pci_range range; |
|
int err; |
|
|
|
err = of_pci_range_parser_init(&parser, np); |
|
if (err) { |
|
pr_warn("of_pci_range_parser_init() failed: %d\n", err); |
|
continue; |
|
} |
|
|
|
for_each_of_pci_range(&parser, &range) |
|
if (efifb_overlaps_pci_range(&range)) |
|
return np; |
|
} |
|
return NULL; |
|
} |
|
|
|
/* |
|
* If the efifb framebuffer is backed by a PCI graphics controller, we have |
|
* to ensure that this relation is expressed using a device link when |
|
* running in DT mode, or the probe order may be reversed, resulting in a |
|
* resource reservation conflict on the memory window that the efifb |
|
* framebuffer steals from the PCIe host bridge. |
|
*/ |
|
static int efifb_add_links(struct fwnode_handle *fwnode) |
|
{ |
|
struct device_node *sup_np; |
|
|
|
sup_np = find_pci_overlap_node(); |
|
|
|
/* |
|
* If there's no PCI graphics controller backing the efifb, we are |
|
* done here. |
|
*/ |
|
if (!sup_np) |
|
return 0; |
|
|
|
fwnode_link_add(fwnode, of_fwnode_handle(sup_np)); |
|
of_node_put(sup_np); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct fwnode_operations efifb_fwnode_ops = { |
|
.add_links = efifb_add_links, |
|
}; |
|
|
|
static struct fwnode_handle efifb_fwnode; |
|
|
|
static int __init register_gop_device(void) |
|
{ |
|
struct platform_device *pd; |
|
int err; |
|
|
|
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) |
|
return 0; |
|
|
|
pd = platform_device_alloc("efi-framebuffer", 0); |
|
if (!pd) |
|
return -ENOMEM; |
|
|
|
if (IS_ENABLED(CONFIG_PCI)) { |
|
fwnode_init(&efifb_fwnode, &efifb_fwnode_ops); |
|
pd->dev.fwnode = &efifb_fwnode; |
|
} |
|
|
|
err = platform_device_add_data(pd, &screen_info, sizeof(screen_info)); |
|
if (err) |
|
return err; |
|
|
|
return platform_device_add(pd); |
|
} |
|
subsys_initcall(register_gop_device);
|
|
|