diff options
Diffstat (limited to 'arch/ia64/kernel/efi.c')
| -rw-r--r-- | arch/ia64/kernel/efi.c | 1353 |
1 files changed, 0 insertions, 1353 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c deleted file mode 100644 index 0a34dcc435c6..000000000000 --- a/arch/ia64/kernel/efi.c +++ /dev/null @@ -1,1353 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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) 1999-2003 Hewlett-Packard Co. - * David Mosberger-Tang <davidm@hpl.hp.com> - * Stephane Eranian <eranian@hpl.hp.com> - * (c) Copyright 2006 Hewlett-Packard Development Company, L.P. - * Bjorn Helgaas <bjorn.helgaas@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/module.h> -#include <linux/memblock.h> -#include <linux/crash_dump.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/time.h> -#include <linux/efi.h> -#include <linux/kexec.h> -#include <linux/mm.h> - -#include <asm/io.h> -#include <asm/kregs.h> -#include <asm/meminit.h> -#include <asm/pgtable.h> -#include <asm/processor.h> -#include <asm/mca.h> -#include <asm/setup.h> -#include <asm/tlbflush.h> - -#define EFI_DEBUG 0 - -static __initdata unsigned long palo_phys; - -unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR; - -static __initdata efi_config_table_type_t arch_tables[] = { - {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys}, - {SAL_SYSTEM_TABLE_GUID, "SALsystab", &sal_systab_phys}, - {NULL_GUID, NULL, 0}, -}; - -extern efi_status_t efi_call_phys (void *, ...); - -static efi_runtime_services_t *runtime; -static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL; - -#define efi_call_virt(f, args...) (*(f))(args) - -#define STUB_GET_TIME(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_time_cap_t *atc = NULL; \ - efi_status_t ret; \ - \ - if (tc) \ - atc = adjust_arg(tc); \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \ - adjust_arg(tm), atc); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_SET_TIME(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_set_time (efi_time_t *tm) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_status_t ret; \ - \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \ - adjust_arg(tm)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \ - efi_time_t *tm) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_status_t ret; \ - \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix( \ - (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \ - adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_time_t *atm = NULL; \ - efi_status_t ret; \ - \ - if (tm) \ - atm = adjust_arg(tm); \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix( \ - (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \ - enabled, atm); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_GET_VARIABLE(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \ - unsigned long *data_size, void *data) \ -{ \ - struct ia64_fpreg fr[6]; \ - u32 *aattr = NULL; \ - efi_status_t ret; \ - \ - if (attr) \ - aattr = adjust_arg(attr); \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix( \ - (efi_get_variable_t *) __va(runtime->get_variable), \ - adjust_arg(name), adjust_arg(vendor), aattr, \ - adjust_arg(data_size), adjust_arg(data)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \ - efi_guid_t *vendor) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_status_t ret; \ - \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix( \ - (efi_get_next_variable_t *) __va(runtime->get_next_variable), \ - adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_SET_VARIABLE(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \ - u32 attr, unsigned long data_size, \ - void *data) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_status_t ret; \ - \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix( \ - (efi_set_variable_t *) __va(runtime->set_variable), \ - adjust_arg(name), adjust_arg(vendor), attr, data_size, \ - adjust_arg(data)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \ -static efi_status_t \ -prefix##_get_next_high_mono_count (u32 *count) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_status_t ret; \ - \ - ia64_save_scratch_fpregs(fr); \ - ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \ - __va(runtime->get_next_high_mono_count), \ - adjust_arg(count)); \ - ia64_load_scratch_fpregs(fr); \ - return ret; \ -} - -#define STUB_RESET_SYSTEM(prefix, adjust_arg) \ -static void \ -prefix##_reset_system (int reset_type, efi_status_t status, \ - unsigned long data_size, efi_char16_t *data) \ -{ \ - struct ia64_fpreg fr[6]; \ - efi_char16_t *adata = NULL; \ - \ - if (data) \ - adata = adjust_arg(data); \ - \ - ia64_save_scratch_fpregs(fr); \ - efi_call_##prefix( \ - (efi_reset_system_t *) __va(runtime->reset_system), \ - reset_type, status, data_size, adata); \ - /* should not return, but just in case... */ \ - ia64_load_scratch_fpregs(fr); \ -} - -#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg)) - -STUB_GET_TIME(phys, phys_ptr) -STUB_SET_TIME(phys, phys_ptr) -STUB_GET_WAKEUP_TIME(phys, phys_ptr) -STUB_SET_WAKEUP_TIME(phys, phys_ptr) -STUB_GET_VARIABLE(phys, phys_ptr) -STUB_GET_NEXT_VARIABLE(phys, phys_ptr) -STUB_SET_VARIABLE(phys, phys_ptr) -STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr) -STUB_RESET_SYSTEM(phys, phys_ptr) - -#define id(arg) arg - -STUB_GET_TIME(virt, id) -STUB_SET_TIME(virt, id) -STUB_GET_WAKEUP_TIME(virt, id) -STUB_SET_WAKEUP_TIME(virt, id) -STUB_GET_VARIABLE(virt, id) -STUB_GET_NEXT_VARIABLE(virt, id) -STUB_SET_VARIABLE(virt, id) -STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id) -STUB_RESET_SYSTEM(virt, id) - -void -efi_gettimeofday (struct timespec64 *ts) -{ - efi_time_t tm; - - if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) { - memset(ts, 0, sizeof(*ts)); - return; - } - - ts->tv_sec = mktime64(tm.year, tm.month, tm.day, - tm.hour, tm.minute, tm.second); - ts->tv_nsec = tm.nanosecond; -} - -static int -is_memory_available (efi_memory_desc_t *md) -{ - if (!(md->attribute & EFI_MEMORY_WB)) - return 0; - - 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: - return 1; - } - return 0; -} - -typedef struct kern_memdesc { - u64 attribute; - u64 start; - u64 num_pages; -} kern_memdesc_t; - -static kern_memdesc_t *kern_memmap; - -#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT) - -static inline u64 -kmd_end(kern_memdesc_t *kmd) -{ - return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT)); -} - -static inline u64 -efi_md_end(efi_memory_desc_t *md) -{ - return (md->phys_addr + efi_md_size(md)); -} - -static inline int -efi_wb(efi_memory_desc_t *md) -{ - return (md->attribute & EFI_MEMORY_WB); -} - -static inline int -efi_uc(efi_memory_desc_t *md) -{ - return (md->attribute & EFI_MEMORY_UC); -} - -static void -walk (efi_freemem_callback_t callback, void *arg, u64 attr) -{ - kern_memdesc_t *k; - u64 start, end, voff; - - voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET; - for (k = kern_memmap; k->start != ~0UL; k++) { - if (k->attribute != attr) - continue; - start = PAGE_ALIGN(k->start); - end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK; - if (start < end) - if ((*callback)(start + voff, end + voff, arg) < 0) - return; - } -} - -/* - * Walk the EFI memory map and call 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) -{ - walk(callback, arg, EFI_MEMORY_WB); -} - -/* - * Walk the EFI memory map and call CALLBACK once for each EFI memory - * descriptor that has memory that is available for uncached allocator. - */ -void -efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg) -{ - walk(callback, arg, EFI_MEMORY_UC); -} - -/* - * Look for the PAL_CODE region reported by EFI and map it using an - * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor - * Abstraction Layer chapter 11 in ADAG - */ -void * -efi_get_pal_addr (void) -{ - void *efi_map_start, *efi_map_end, *p; - efi_memory_desc_t *md; - u64 efi_desc_size; - int pal_code_count = 0; - u64 vaddr, mask; - - 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 @ %llx\n", 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(KERN_INFO "%s: no need to install ITR for PAL code\n", - __func__); - continue; - } - - if (efi_md_size(md) > IA64_GRANULE_SIZE) - panic("Whoa! PAL code size bigger than a granule!"); - -#if EFI_DEBUG - mask = ~((1 << IA64_GRANULE_SHIFT) - 1); - - printk(KERN_INFO "CPU %d: mapping PAL code " - "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n", - smp_processor_id(), md->phys_addr, - md->phys_addr + efi_md_size(md), - vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE); -#endif - return __va(md->phys_addr); - } - printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n", - __func__); - return NULL; -} - - -static u8 __init palo_checksum(u8 *buffer, u32 length) -{ - u8 sum = 0; - u8 *end = buffer + length; - - while (buffer < end) - sum = (u8) (sum + *(buffer++)); - - return sum; -} - -/* - * Parse and handle PALO table which is published at: - * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf - */ -static void __init handle_palo(unsigned long phys_addr) -{ - struct palo_table *palo = __va(phys_addr); - u8 checksum; - - if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) { - printk(KERN_INFO "PALO signature incorrect.\n"); - return; - } - - checksum = palo_checksum((u8 *)palo, palo->length); - if (checksum) { - printk(KERN_INFO "PALO checksum incorrect.\n"); - return; - } - - setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO); -} - -void -efi_map_pal_code (void) -{ - void *pal_vaddr = efi_get_pal_addr (); - u64 psr; - - if (!pal_vaddr) - return; - - /* - * Cannot write to CRx with PSR.ic=1 - */ - psr = ia64_clear_ic(); - ia64_itr(0x1, IA64_TR_PALCODE, - GRANULEROUNDDOWN((unsigned long) pal_vaddr), - pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)), - IA64_GRANULE_SHIFT); - ia64_set_psr(psr); /* restore psr */ -} - -void __init -efi_init (void) -{ - void *efi_map_start, *efi_map_end; - efi_char16_t *c16; - u64 efi_desc_size; - char *cp, vendor[100] = "unknown"; - int i; - - set_bit(EFI_BOOT, &efi.flags); - set_bit(EFI_64BIT, &efi.flags); - - /* - * It's too early to be able to use the standard kernel command line - * support... - */ - for (cp = boot_command_line; *cp; ) { - if (memcmp(cp, "mem=", 4) == 0) { - mem_limit = memparse(cp + 4, &cp); - } else if (memcmp(cp, "max_addr=", 9) == 0) { - max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); - } else if (memcmp(cp, "min_addr=", 9) == 0) { - min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); - } else { - while (*cp != ' ' && *cp) - ++cp; - while (*cp == ' ') - ++cp; - } - } - if (min_addr != 0UL) - printk(KERN_INFO "Ignoring memory below %lluMB\n", - min_addr >> 20); - if (max_addr != ~0UL) - printk(KERN_INFO "Ignoring memory above %lluMB\n", - max_addr >> 20); - - efi.systab = __va(ia64_boot_param->efi_systab); - - /* - * Verify the EFI Table - */ - if (efi.systab == NULL) - panic("Whoa! Can't find EFI system table.\n"); - if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) - panic("Whoa! EFI system table signature incorrect\n"); - if ((efi.systab->hdr.revision >> 16) == 0) - printk(KERN_WARNING "Warning: EFI system table version " - "%d.%02d, expected 1.00 or greater\n", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff); - - /* Show what we know for posterity */ - c16 = __va(efi.systab->fw_vendor); - if (c16) { - for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i) - vendor[i] = *c16++; - vendor[i] = '\0'; - } - - printk(KERN_INFO "EFI v%u.%.02u by %s:", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff, vendor); - - palo_phys = EFI_INVALID_TABLE_ADDR; - - if (efi_config_init(arch_tables) != 0) - return; - - if (palo_phys != EFI_INVALID_TABLE_ADDR) - handle_palo(palo_phys); - - 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) - { - const char *unit; - unsigned long size; - char buf[64]; - - md = p; - size = md->num_pages << EFI_PAGE_SHIFT; - - if ((size >> 40) > 0) { - size >>= 40; - unit = "TB"; - } else if ((size >> 30) > 0) { - size >>= 30; - unit = "GB"; - } else if ((size >> 20) > 0) { - size >>= 20; - unit = "MB"; - } else { - size >>= 10; - unit = "KB"; - } - - printk("mem%02d: %s " - "range=[0x%016lx-0x%016lx) (%4lu%s)\n", - i, efi_md_typeattr_format(buf, sizeof(buf), md), - md->phys_addr, - md->phys_addr + efi_md_size(md), size, unit); - } - } -#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(KERN_INFO "EFI_MEMORY_WC mapping\n"); - 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(KERN_INFO "EFI_MEMORY_WT mapping\n"); - 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(KERN_WARNING "warning: unable to switch EFI into " - "virtual mode (status=%lu)\n", status); - return; - } - - set_bit(EFI_RUNTIME_SERVICES, &efi.flags); - - /* - * Now that EFI is in virtual mode, we call the EFI functions more - * efficiently: - */ - efi.get_time = virt_get_time; - efi.set_time = virt_set_time; - efi.get_wakeup_time = virt_get_wakeup_time; - efi.set_wakeup_time = virt_set_wakeup_time; - efi.get_variable = virt_get_variable; - efi.get_next_variable = virt_get_next_variable; - efi.set_variable = virt_set_variable; - efi.get_next_high_mono_count = virt_get_next_high_mono_count; - efi.reset_system = virt_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) { - if (md->attribute & EFI_MEMORY_UC) - return md->phys_addr; - } - } - return 0; -} - -static struct kern_memdesc * -kern_memory_descriptor (unsigned long phys_addr) -{ - struct kern_memdesc *md; - - for (md = kern_memmap; md->start != ~0UL; md++) { - if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT)) - return md; - } - return NULL; -} - -static efi_memory_desc_t * -efi_memory_descriptor (unsigned long phys_addr) -{ - 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 (phys_addr - md->phys_addr < efi_md_size(md)) - return md; - } - return NULL; -} - -static int -efi_memmap_intersects (unsigned long phys_addr, unsigned long size) -{ - void *efi_map_start, *efi_map_end, *p; - efi_memory_desc_t *md; - u64 efi_desc_size; - unsigned long 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; - - end = phys_addr + size; - - for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { - md = p; - if (md->phys_addr < end && efi_md_end(md) > phys_addr) - return 1; - } - return 0; -} - -int -efi_mem_type (unsigned long phys_addr) -{ - efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); - - if (md) - return md->type; - return -EINVAL; -} - -u64 -efi_mem_attributes (unsigned long phys_addr) -{ - efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); - - if (md) - return md->attribute; - return 0; -} -EXPORT_SYMBOL(efi_mem_attributes); - -u64 -efi_mem_attribute (unsigned long phys_addr, unsigned long size) -{ - unsigned long end = phys_addr + size; - efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); - u64 attr; - - if (!md) - return 0; - - /* - * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells - * the kernel that firmware needs this region mapped. - */ - attr = md->attribute & ~EFI_MEMORY_RUNTIME; - do { - unsigned long md_end = efi_md_end(md); - - if (end <= md_end) - return attr; - - md = efi_memory_descriptor(md_end); - if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr) - return 0; - } while (md); - return 0; /* never reached */ -} - -u64 -kern_mem_attribute (unsigned long phys_addr, unsigned long size) -{ - unsigned long end = phys_addr + size; - struct kern_memdesc *md; - u64 attr; - - /* - * This is a hack for ioremap calls before we set up kern_memmap. - * Maybe we should do efi_memmap_init() earlier instead. - */ - if (!kern_memmap) { - attr = efi_mem_attribute(phys_addr, size); - if (attr & EFI_MEMORY_WB) - return EFI_MEMORY_WB; - return 0; - } - - md = kern_memory_descriptor(phys_addr); - if (!md) - return 0; - - attr = md->attribute; - do { - unsigned long md_end = kmd_end(md); - - if (end <= md_end) - return attr; - - md = kern_memory_descriptor(md_end); - if (!md || md->attribute != attr) - return 0; - } while (md); - return 0; /* never reached */ -} - -int -valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size) -{ - u64 attr; - - /* - * /dev/mem reads and writes use copy_to_user(), which implicitly - * uses a granule-sized kernel identity mapping. It's really - * only safe to do this for regions in kern_memmap. For more - * details, see Documentation/ia64/aliasing.rst. - */ - attr = kern_mem_attribute(phys_addr, size); - if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) - return 1; - return 0; -} - -int -valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size) -{ - unsigned long phys_addr = pfn << PAGE_SHIFT; - u64 attr; - - attr = efi_mem_attribute(phys_addr, size); - - /* - * /dev/mem mmap uses normal user pages, so we don't need the entire - * granule, but the entire region we're mapping must support the same - * attribute. - */ - if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) - return 1; - - /* - * Intel firmware doesn't tell us about all the MMIO regions, so - * in general we have to allow mmap requests. But if EFI *does* - * tell us about anything inside this region, we should deny it. - * The user can always map a smaller region to avoid the overlap. - */ - if (efi_memmap_intersects(phys_addr, size)) - return 0; - - return 1; -} - -pgprot_t -phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, - pgprot_t vma_prot) -{ - unsigned long phys_addr = pfn << PAGE_SHIFT; - u64 attr; - - /* - * For /dev/mem mmap, we use user mappings, but if the region is - * in kern_memmap (and hence may be covered by a kernel mapping), - * we must use the same attribute as the kernel mapping. - */ - attr = kern_mem_attribute(phys_addr, size); - if (attr & EFI_MEMORY_WB) - return pgprot_cacheable(vma_prot); - else if (attr & EFI_MEMORY_UC) - return pgprot_noncached(vma_prot); - - /* - * Some chipsets don't support UC access to memory. If - * WB is supported, we prefer that. - */ - if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) - return pgprot_cacheable(vma_prot); - - return pgprot_noncached(vma_prot); -} - -int __init -efi_uart_console_only(void) -{ - efi_status_t status; - char *s, name[] = "ConOut"; - efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID; - efi_char16_t *utf16, name_utf16[32]; - unsigned char data[1024]; - unsigned long size = sizeof(data); - struct efi_generic_dev_path *hdr, *end_addr; - int uart = 0; - - /* Convert to UTF-16 */ - utf16 = name_utf16; - s = name; - while (*s) - *utf16++ = *s++ & 0x7f; - *utf16 = 0; - - status = efi.get_variable(name_utf16, &guid, NULL, &size, data); - if (status != EFI_SUCCESS) { - printk(KERN_ERR "No EFI %s variable?\n", name); - return 0; - } - - hdr = (struct efi_generic_dev_path *) data; - end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size); - while (hdr < end_addr) { - if (hdr->type == EFI_DEV_MSG && - hdr->sub_type == EFI_DEV_MSG_UART) - uart = 1; - else if (hdr->type == EFI_DEV_END_PATH || - hdr->type == EFI_DEV_END_PATH2) { - if (!uart) - return 0; - if (hdr->sub_type == EFI_DEV_END_ENTIRE) - return 1; - uart = 0; - } - hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length); - } - printk(KERN_ERR "Malformed %s value\n", name); - return 0; -} - -/* - * Look for the first granule aligned memory descriptor memory - * that is big enough to hold EFI memory map. Make sure this - * descriptor is at least granule sized so it does not get trimmed - */ -struct kern_memdesc * -find_memmap_space (void) -{ - u64 contig_low=0, contig_high=0; - u64 as = 0, ae; - void *efi_map_start, *efi_map_end, *p, *q; - efi_memory_desc_t *md, *pmd = NULL, *check_md; - u64 space_needed, efi_desc_size; - unsigned long total_mem = 0; - - 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; - - /* - * Worst case: we need 3 kernel descriptors for each efi descriptor - * (if every entry has a WB part in the middle, and UC head and tail), - * plus one for the end marker. - */ - space_needed = sizeof(kern_memdesc_t) * - (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1); - - for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { - md = p; - if (!efi_wb(md)) { - continue; - } - if (pmd == NULL || !efi_wb(pmd) || - efi_md_end(pmd) != md->phys_addr) { - contig_low = GRANULEROUNDUP(md->phys_addr); - contig_high = efi_md_end(md); - for (q = p + efi_desc_size; q < efi_map_end; - q += efi_desc_size) { - check_md = q; - if (!efi_wb(check_md)) - break; - if (contig_high != check_md->phys_addr) - break; - contig_high = efi_md_end(check_md); - } - contig_high = GRANULEROUNDDOWN(contig_high); - } - if (!is_memory_available(md) || md->type == EFI_LOADER_DATA) - continue; - - /* Round ends inward to granule boundaries */ - as = max(contig_low, md->phys_addr); - ae = min(contig_high, efi_md_end(md)); - - /* keep within max_addr= and min_addr= command line arg */ - as = max(as, min_addr); - ae = min(ae, max_addr); - if (ae <= as) - continue; - - /* avoid going over mem= command line arg */ - if (total_mem + (ae - as) > mem_limit) - ae -= total_mem + (ae - as) - mem_limit; - - if (ae <= as) - continue; - - if (ae - as > space_needed) - break; - } - if (p >= efi_map_end) - panic("Can't allocate space for kernel memory descriptors"); - - return __va(as); -} - -/* - * Walk the EFI memory map and gather all memory available for kernel - * to use. We can allocate partial granules only if the unavailable - * parts exist, and are WB. - */ -unsigned long -efi_memmap_init(u64 *s, u64 *e) -{ - struct kern_memdesc *k, *prev = NULL; - u64 contig_low=0, contig_high=0; - u64 as, ae, lim; - void *efi_map_start, *efi_map_end, *p, *q; - efi_memory_desc_t *md, *pmd = NULL, *check_md; - u64 efi_desc_size; - unsigned long total_mem = 0; - - k = kern_memmap = find_memmap_space(); - - 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; pmd = md, p += efi_desc_size) { - md = p; - if (!efi_wb(md)) { - if (efi_uc(md) && - (md->type == EFI_CONVENTIONAL_MEMORY || - md->type == EFI_BOOT_SERVICES_DATA)) { - k->attribute = EFI_MEMORY_UC; - k->start = md->phys_addr; - k->num_pages = md->num_pages; - k++; - } - continue; - } - if (pmd == NULL || !efi_wb(pmd) || - efi_md_end(pmd) != md->phys_addr) { - contig_low = GRANULEROUNDUP(md->phys_addr); - contig_high = efi_md_end(md); - for (q = p + efi_desc_size; q < efi_map_end; - q += efi_desc_size) { - check_md = q; - if (!efi_wb(check_md)) - break; - if (contig_high != check_md->phys_addr) - break; - contig_high = efi_md_end(check_md); - } - contig_high = GRANULEROUNDDOWN(contig_high); - } - if (!is_memory_available(md)) - continue; - - /* - * Round ends inward to granule boundaries - * Give trimmings to uncached allocator - */ - if (md->phys_addr < contig_low) { - lim = min(efi_md_end(md), contig_low); - if (efi_uc(md)) { - if (k > kern_memmap && - (k-1)->attribute == EFI_MEMORY_UC && - kmd_end(k-1) == md->phys_addr) { - (k-1)->num_pages += - (lim - md->phys_addr) - >> EFI_PAGE_SHIFT; - } else { - k->attribute = EFI_MEMORY_UC; - k->start = md->phys_addr; - k->num_pages = (lim - md->phys_addr) - >> EFI_PAGE_SHIFT; - k++; - } - } - as = contig_low; - } else - as = md->phys_addr; - - if (efi_md_end(md) > contig_high) { - lim = max(md->phys_addr, contig_high); - if (efi_uc(md)) { - if (lim == md->phys_addr && k > kern_memmap && - (k-1)->attribute == EFI_MEMORY_UC && - kmd_end(k-1) == md->phys_addr) { - (k-1)->num_pages += md->num_pages; - } else { - k->attribute = EFI_MEMORY_UC; - k->start = lim; - k->num_pages = (efi_md_end(md) - lim) - >> EFI_PAGE_SHIFT; - k++; - } - } - ae = contig_high; - } else - ae = efi_md_end(md); - - /* keep within max_addr= and min_addr= command line arg */ - as = max(as, min_addr); - ae = min(ae, max_addr); - if (ae <= as) - continue; - - /* avoid going over mem= command line arg */ - if (total_mem + (ae - as) > mem_limit) - ae -= total_mem + (ae - as) - mem_limit; - - if (ae <= as) - continue; - if (prev && kmd_end(prev) == md->phys_addr) { - prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT; - total_mem += ae - as; - continue; - } - k->attribute = EFI_MEMORY_WB; - k->start = as; - k->num_pages = (ae - as) >> EFI_PAGE_SHIFT; - total_mem += ae - as; - prev = k++; - } - k->start = ~0L; /* end-marker */ - - /* reserve the memory we are using for kern_memmap */ - *s = (u64)kern_memmap; - *e = (u64)++k; - - return total_mem; -} - -void -efi_initialize_iomem_resources(struct resource *code_resource, - struct resource *data_resource, - struct resource *bss_resource) -{ - struct resource *res; - void *efi_map_start, *efi_map_end, *p; - efi_memory_desc_t *md; - u64 efi_desc_size; - char *name; - unsigned long flags, desc; - - 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; - - res = NULL; - - for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { - md = p; - - if (md->num_pages == 0) /* should not happen */ - continue; - - flags = IORESOURCE_MEM | IORESOURCE_BUSY; - desc = IORES_DESC_NONE; - - switch (md->type) { - - case EFI_MEMORY_MAPPED_IO: - case EFI_MEMORY_MAPPED_IO_PORT_SPACE: - continue; - - case EFI_LOADER_CODE: - case EFI_LOADER_DATA: - case EFI_BOOT_SERVICES_DATA: - case EFI_BOOT_SERVICES_CODE: - case EFI_CONVENTIONAL_MEMORY: - if (md->attribute & EFI_MEMORY_WP) { - name = "System ROM"; - flags |= IORESOURCE_READONLY; - } else if (md->attribute == EFI_MEMORY_UC) { - name = "Uncached RAM"; - } else { - name = "System RAM"; - flags |= IORESOURCE_SYSRAM; - } - break; - - case EFI_ACPI_MEMORY_NVS: - name = "ACPI Non-volatile Storage"; - desc = IORES_DESC_ACPI_NV_STORAGE; - break; - - case EFI_UNUSABLE_MEMORY: - name = "reserved"; - flags |= IORESOURCE_DISABLED; - break; - - case EFI_PERSISTENT_MEMORY: - name = "Persistent Memory"; - desc = IORES_DESC_PERSISTENT_MEMORY; - break; - - case EFI_RESERVED_TYPE: - case EFI_RUNTIME_SERVICES_CODE: - case EFI_RUNTIME_SERVICES_DATA: - case EFI_ACPI_RECLAIM_MEMORY: - default: - name = "reserved"; - break; - } - - if ((res = kzalloc(sizeof(struct resource), - GFP_KERNEL)) == NULL) { - printk(KERN_ERR - "failed to allocate resource for iomem\n"); - return; - } - - res->name = name; - res->start = md->phys_addr; - res->end = md->phys_addr + efi_md_size(md) - 1; - res->flags = flags; - res->desc = desc; - - if (insert_resource(&iomem_resource, res) < 0) - kfree(res); - else { - /* - * We don't know which region contains - * kernel data so we try it repeatedly and - * let the resource manager test it. - */ - insert_resource(res, code_resource); - insert_resource(res, data_resource); - insert_resource(res, bss_resource); -#ifdef CONFIG_KEXEC - insert_resource(res, &efi_memmap_res); - insert_resource(res, &boot_param_res); - if (crashk_res.end > crashk_res.start) - insert_resource(res, &crashk_res); -#endif - } - } -} - -#ifdef CONFIG_KEXEC -/* find a block of memory aligned to 64M exclude reserved regions - rsvd_regions are sorted - */ -unsigned long __init -kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n) -{ - int i; - u64 start, end; - u64 alignment = 1UL << _PAGE_SIZE_64M; - 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 (!efi_wb(md)) - continue; - start = ALIGN(md->phys_addr, alignment); - end = efi_md_end(md); - for (i = 0; i < n; i++) { - if (__pa(r[i].start) >= start && __pa(r[i].end) < end) { - if (__pa(r[i].start) > start + size) - return start; - start = ALIGN(__pa(r[i].end), alignment); - if (i < n-1 && - __pa(r[i+1].start) < start + size) - continue; - else - break; - } - } - if (end > start + size) - return start; - } - - printk(KERN_WARNING - "Cannot reserve 0x%lx byte of memory for crashdump\n", size); - return ~0UL; -} -#endif - -#ifdef CONFIG_CRASH_DUMP -/* locate the size find a the descriptor at a certain address */ -unsigned long __init -vmcore_find_descriptor_size (unsigned long address) -{ - void *efi_map_start, *efi_map_end, *p; - efi_memory_desc_t *md; - u64 efi_desc_size; - unsigned long ret = 0; - - 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 (efi_wb(md) && md->type == EFI_LOADER_DATA - && md->phys_addr == address) { - ret = efi_md_size(md); - break; - } - } - - if (ret == 0) - printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n"); - - return ret; -} -#endif |