efi.c
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上传日期:2013-02-24
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- /*
- * Extensible Firmware Interface
- *
- * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
- *
- * Copyright (C) 1999 VA Linux Systems
- * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
- * Copyright (C) 1999-2001 Hewlett-Packard Co.
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * Stephane Eranian <eranian@hpl.hp.com>
- *
- * All EFI Runtime Services are not implemented yet as EFI only
- * supports physical mode addressing on SoftSDV. This is to be fixed
- * in a future version. --drummond 1999-07-20
- *
- * Implemented EFI runtime services and virtual mode calls. --davidm
- *
- * Goutham Rao: <goutham.rao@intel.com>
- * Skip non-WB memory and ignore empty memory ranges.
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/time.h>
- #include <linux/proc_fs.h>
- #include <asm/efi.h>
- #include <asm/io.h>
- #include <asm/kregs.h>
- #include <asm/pgtable.h>
- #include <asm/processor.h>
- #define EFI_DEBUG 0
- extern efi_status_t efi_call_phys (void *, ...);
- struct efi efi;
- static efi_runtime_services_t *runtime;
- /*
- * efi_dir is allocated here, but the directory isn't created
- * here, as proc_mkdir() doesn't work this early in the bootup
- * process. Therefore, each module, like efivars, must test for
- * if (!efi_dir) efi_dir = proc_mkdir("efi", NULL);
- * prior to creating their own entries under /proc/efi.
- */
- #ifdef CONFIG_PROC_FS
- struct proc_dir_entry *efi_dir = NULL;
- #endif
- static unsigned long mem_limit = ~0UL;
- static efi_status_t
- phys_get_time (efi_time_t *tm, efi_time_cap_t *tc)
- {
- return efi_call_phys(__va(runtime->get_time), __pa(tm), __pa(tc));
- }
- static efi_status_t
- phys_set_time (efi_time_t *tm)
- {
- return efi_call_phys(__va(runtime->set_time), __pa(tm));
- }
- static efi_status_t
- phys_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)
- {
- return efi_call_phys(__va(runtime->get_wakeup_time), __pa(enabled), __pa(pending),
- __pa(tm));
- }
- static efi_status_t
- phys_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)
- {
- return efi_call_phys(__va(runtime->set_wakeup_time), enabled, __pa(tm));
- }
- static efi_status_t
- phys_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
- unsigned long *data_size, void *data)
- {
- return efi_call_phys(__va(runtime->get_variable), __pa(name), __pa(vendor), __pa(attr),
- __pa(data_size), __pa(data));
- }
- static efi_status_t
- phys_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)
- {
- return efi_call_phys(__va(runtime->get_next_variable), __pa(name_size), __pa(name),
- __pa(vendor));
- }
- static efi_status_t
- phys_set_variable (efi_char16_t *name, efi_guid_t *vendor, u32 attr,
- unsigned long data_size, void *data)
- {
- return efi_call_phys(__va(runtime->set_variable), __pa(name), __pa(vendor), attr,
- data_size, __pa(data));
- }
- static efi_status_t
- phys_get_next_high_mono_count (u64 *count)
- {
- return efi_call_phys(__va(runtime->get_next_high_mono_count), __pa(count));
- }
- static void
- phys_reset_system (int reset_type, efi_status_t status,
- unsigned long data_size, efi_char16_t *data)
- {
- efi_call_phys(__va(runtime->reset_system), status, data_size, __pa(data));
- }
- void
- efi_gettimeofday (struct timeval *tv)
- {
- efi_time_t tm;
- memset(tv, 0, sizeof(tv));
- if ((*efi.get_time)(&tm, 0) != EFI_SUCCESS)
- return;
- tv->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
- tv->tv_usec = tm.nanosecond / 1000;
- }
- /*
- * Walks the EFI memory map and calls CALLBACK once for each EFI
- * memory descriptor that has memory that is available for OS use.
- */
- void
- efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
- {
- int prev_valid = 0;
- struct range {
- u64 start;
- u64 end;
- } prev, curr;
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size, start, end;
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
- switch (md->type) {
- case EFI_LOADER_CODE:
- case EFI_LOADER_DATA:
- case EFI_BOOT_SERVICES_CODE:
- case EFI_BOOT_SERVICES_DATA:
- case EFI_CONVENTIONAL_MEMORY:
- if (!(md->attribute & EFI_MEMORY_WB))
- continue;
- if (md->phys_addr + (md->num_pages << 12) > mem_limit) {
- if (md->phys_addr > mem_limit)
- continue;
- md->num_pages = (mem_limit - md->phys_addr) >> 12;
- }
- if (md->num_pages == 0) {
- printk("efi_memmap_walk: ignoring empty region at 0x%lx",
- md->phys_addr);
- continue;
- }
- curr.start = PAGE_OFFSET + md->phys_addr;
- curr.end = curr.start + (md->num_pages << 12);
- if (!prev_valid) {
- prev = curr;
- prev_valid = 1;
- } else {
- if (curr.start < prev.start)
- printk("Oops: EFI memory table not ordered!n");
- if (prev.end == curr.start) {
- /* merge two consecutive memory ranges */
- prev.end = curr.end;
- } else {
- start = PAGE_ALIGN(prev.start);
- end = prev.end & PAGE_MASK;
- if ((end > start) && (*callback)(start, end, arg) < 0)
- return;
- prev = curr;
- }
- }
- break;
- default:
- continue;
- }
- }
- if (prev_valid) {
- start = PAGE_ALIGN(prev.start);
- end = prev.end & PAGE_MASK;
- if (end > start)
- (*callback)(start, end, arg);
- }
- }
- /*
- * Look for the PAL_CODE region reported by EFI and maps it using an
- * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
- * Abstraction Layer chapter 11 in ADAG
- */
- void
- efi_map_pal_code (void)
- {
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
- int pal_code_count=0;
- u64 mask, flags;
- u64 vaddr;
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
- if (md->type != EFI_PAL_CODE)
- continue;
- if (++pal_code_count > 1) {
- printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lxn",
- md->phys_addr);
- continue;
- }
- /*
- * The only ITLB entry in region 7 that is used is the one installed by
- * __start(). That entry covers a 64MB range.
- */
- mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
- vaddr = PAGE_OFFSET + md->phys_addr;
- /*
- * We must check that the PAL mapping won't overlap with the kernel
- * mapping.
- *
- * PAL code is guaranteed to be aligned on a power of 2 between 4k and
- * 256KB and that only one ITR is needed to map it. This implies that the
- * PAL code is always aligned on its size, i.e., the closest matching page
- * size supported by the TLB. Therefore PAL code is guaranteed never to
- * cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
- * now the following test is enough to determine whether or not we need a
- * dedicated ITR for the PAL code.
- */
- if ((vaddr & mask) == (KERNEL_START & mask)) {
- printk(__FUNCTION__ ": no need to install ITR for PAL coden");
- continue;
- }
- if (md->num_pages << 12 > IA64_GRANULE_SIZE)
- panic("Woah! PAL code size bigger than a granule!");
- mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
- printk("CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)n",
- smp_processor_id(), md->phys_addr, md->phys_addr + (md->num_pages << 12),
- vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
- /*
- * Cannot write to CRx with PSR.ic=1
- */
- ia64_clear_ic(flags);
- ia64_itr(0x1, IA64_TR_PALCODE, vaddr & mask,
- pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL)), IA64_GRANULE_SHIFT);
- local_irq_restore(flags);
- ia64_srlz_i();
- }
- }
- void __init
- efi_init (void)
- {
- void *efi_map_start, *efi_map_end;
- efi_config_table_t *config_tables;
- efi_char16_t *c16;
- u64 efi_desc_size;
- char *cp, *end, vendor[100] = "unknown";
- extern char saved_command_line[];
- int i;
- /* it's too early to be able to use the standard kernel command line support... */
- for (cp = saved_command_line; *cp; ) {
- if (memcmp(cp, "mem=", 4) == 0) {
- cp += 4;
- mem_limit = memparse(cp, &end) - 1;
- if (end != cp)
- break;
- cp = end;
- } else {
- while (*cp != ' ' && *cp)
- ++cp;
- while (*cp == ' ')
- ++cp;
- }
- }
- if (mem_limit != ~0UL)
- printk("Ignoring memory above %luMBn", mem_limit >> 20);
- efi.systab = __va(ia64_boot_param->efi_systab);
- /*
- * Verify the EFI Table
- */
- if (efi.systab == NULL)
- panic("Woah! Can't find EFI system table.n");
- if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
- panic("Woah! EFI system table signature incorrectn");
- if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
- printk("Warning: EFI system table major version mismatch: "
- "got %d.%02d, expected %d.%02dn",
- efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
- EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
- config_tables = __va(efi.systab->tables);
- /* Show what we know for posterity */
- c16 = __va(efi.systab->fw_vendor);
- if (c16) {
- for (i = 0;i < sizeof(vendor) && *c16; ++i)
- vendor[i] = *c16++;
- vendor[i] = ' ';
- }
- printk("EFI v%u.%.02u by %s:",
- efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
- for (i = 0; i < efi.systab->nr_tables; i++) {
- if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
- efi.mps = __va(config_tables[i].table);
- printk(" MPS=0x%lx", config_tables[i].table);
- } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
- efi.acpi20 = __va(config_tables[i].table);
- printk(" ACPI 2.0=0x%lx", config_tables[i].table);
- } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
- efi.acpi = __va(config_tables[i].table);
- printk(" ACPI=0x%lx", config_tables[i].table);
- } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
- efi.smbios = __va(config_tables[i].table);
- printk(" SMBIOS=0x%lx", config_tables[i].table);
- } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
- efi.sal_systab = __va(config_tables[i].table);
- printk(" SALsystab=0x%lx", config_tables[i].table);
- }
- }
- printk("n");
- runtime = __va(efi.systab->runtime);
- efi.get_time = phys_get_time;
- efi.set_time = phys_set_time;
- efi.get_wakeup_time = phys_get_wakeup_time;
- efi.set_wakeup_time = phys_set_wakeup_time;
- efi.get_variable = phys_get_variable;
- efi.get_next_variable = phys_get_next_variable;
- efi.set_variable = phys_set_variable;
- efi.get_next_high_mono_count = phys_get_next_high_mono_count;
- efi.reset_system = phys_reset_system;
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
- #if EFI_DEBUG
- /* print EFI memory map: */
- {
- efi_memory_desc_t *md;
- void *p;
- for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
- md = p;
- printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)n",
- i, md->type, md->attribute, md->phys_addr,
- md->phys_addr + (md->num_pages<<12) - 1, md->num_pages >> 8);
- }
- }
- #endif
- efi_map_pal_code();
- efi_enter_virtual_mode();
- }
- void
- efi_enter_virtual_mode (void)
- {
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- efi_status_t status;
- u64 efi_desc_size;
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
- if (md->attribute & EFI_MEMORY_RUNTIME) {
- /*
- * Some descriptors have multiple bits set, so the order of
- * the tests is relevant.
- */
- if (md->attribute & EFI_MEMORY_WB) {
- md->virt_addr = (u64) __va(md->phys_addr);
- } else if (md->attribute & EFI_MEMORY_UC) {
- md->virt_addr = (u64) ioremap(md->phys_addr, 0);
- } else if (md->attribute & EFI_MEMORY_WC) {
- #if 0
- md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
- | _PAGE_D
- | _PAGE_MA_WC
- | _PAGE_PL_0
- | _PAGE_AR_RW));
- #else
- printk("EFI_MEMORY_WC mappingn");
- md->virt_addr = (u64) ioremap(md->phys_addr, 0);
- #endif
- } else if (md->attribute & EFI_MEMORY_WT) {
- #if 0
- md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
- | _PAGE_D | _PAGE_MA_WT
- | _PAGE_PL_0
- | _PAGE_AR_RW));
- #else
- printk("EFI_MEMORY_WT mappingn");
- md->virt_addr = (u64) ioremap(md->phys_addr, 0);
- #endif
- }
- }
- }
- status = efi_call_phys(__va(runtime->set_virtual_address_map),
- ia64_boot_param->efi_memmap_size,
- efi_desc_size, ia64_boot_param->efi_memdesc_version,
- ia64_boot_param->efi_memmap);
- if (status != EFI_SUCCESS) {
- printk("Warning: unable to switch EFI into virtual mode (status=%lu)n", status);
- return;
- }
- /*
- * Now that EFI is in virtual mode, we arrange for EFI functions to be
- * called directly:
- */
- efi.get_time = __va(runtime->get_time);
- efi.set_time = __va(runtime->set_time);
- efi.get_wakeup_time = __va(runtime->get_wakeup_time);
- efi.set_wakeup_time = __va(runtime->set_wakeup_time);
- efi.get_variable = __va(runtime->get_variable);
- efi.get_next_variable = __va(runtime->get_next_variable);
- efi.set_variable = __va(runtime->set_variable);
- efi.get_next_high_mono_count = __va(runtime->get_next_high_mono_count);
- efi.reset_system = __va(runtime->reset_system);
- }
- /*
- * Walk the EFI memory map looking for the I/O port range. There can only be one entry of
- * this type, other I/O port ranges should be described via ACPI.
- */
- u64
- efi_get_iobase (void)
- {
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
- if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
- /* paranoia attribute checking */
- if (md->attribute == (EFI_MEMORY_UC | EFI_MEMORY_RUNTIME))
- return md->phys_addr;
- }
- }
- return 0;
- }
- static void __exit
- efivars_exit(void)
- {
- #ifdef CONFIG_PROC_FS
- remove_proc_entry(efi_dir->name, NULL);
- #endif
- }