diff options
Diffstat (limited to 'arch/ia64/kernel/efi.c')
| -rw-r--r-- | arch/ia64/kernel/efi.c | 832 |
1 files changed, 832 insertions, 0 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c new file mode 100644 index 000000000000..4a3b1aac43e7 --- /dev/null +++ b/arch/ia64/kernel/efi.c @@ -0,0 +1,832 @@ +/* + * 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> + * + * 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/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/time.h> +#include <linux/efi.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> + +#define EFI_DEBUG 0 + +extern efi_status_t efi_call_phys (void *, ...); + +struct efi efi; +EXPORT_SYMBOL(efi); +static efi_runtime_services_t *runtime; +static unsigned long mem_limit = ~0UL, max_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, unsigned long 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 timespec *ts) +{ + efi_time_t tm; + + memset(ts, 0, sizeof(ts)); + if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) + return; + + ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second); + ts->tv_nsec = tm.nanosecond; +} + +static int +is_available_memory (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; +} + +/* + * Trim descriptor MD so its starts at address START_ADDR. If the descriptor covers + * memory that is normally available to the kernel, issue a warning that some memory + * is being ignored. + */ +static void +trim_bottom (efi_memory_desc_t *md, u64 start_addr) +{ + u64 num_skipped_pages; + + if (md->phys_addr >= start_addr || !md->num_pages) + return; + + num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT; + if (num_skipped_pages > md->num_pages) + num_skipped_pages = md->num_pages; + + if (is_available_memory(md)) + printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole " + "at 0x%lx\n", __FUNCTION__, + (num_skipped_pages << EFI_PAGE_SHIFT) >> 10, + md->phys_addr, start_addr - IA64_GRANULE_SIZE); + /* + * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory + * descriptor list to become unsorted. In such a case, md->num_pages will be + * zero, so the Right Thing will happen. + */ + md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT; + md->num_pages -= num_skipped_pages; +} + +static void +trim_top (efi_memory_desc_t *md, u64 end_addr) +{ + u64 num_dropped_pages, md_end_addr; + + md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); + + if (md_end_addr <= end_addr || !md->num_pages) + return; + + num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT; + if (num_dropped_pages > md->num_pages) + num_dropped_pages = md->num_pages; + + if (is_available_memory(md)) + printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole " + "at 0x%lx\n", __FUNCTION__, + (num_dropped_pages << EFI_PAGE_SHIFT) >> 10, + md->phys_addr, end_addr); + md->num_pages -= num_dropped_pages; +} + +/* + * 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, *q; + efi_memory_desc_t *md, *check_md; + u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0; + 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; + + for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { + md = p; + + /* skip over non-WB memory descriptors; that's all we're interested in... */ + if (!(md->attribute & EFI_MEMORY_WB)) + continue; + + /* + * granule_addr is the base of md's first granule. + * [granule_addr - first_non_wb_addr) is guaranteed to + * be contiguous WB memory. + */ + granule_addr = GRANULEROUNDDOWN(md->phys_addr); + first_non_wb_addr = max(first_non_wb_addr, granule_addr); + + if (first_non_wb_addr < md->phys_addr) { + trim_bottom(md, granule_addr + IA64_GRANULE_SIZE); + granule_addr = GRANULEROUNDDOWN(md->phys_addr); + first_non_wb_addr = max(first_non_wb_addr, granule_addr); + } + + for (q = p; q < efi_map_end; q += efi_desc_size) { + check_md = q; + + if ((check_md->attribute & EFI_MEMORY_WB) && + (check_md->phys_addr == first_non_wb_addr)) + first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT; + else + break; /* non-WB or hole */ + } + + last_granule_addr = GRANULEROUNDDOWN(first_non_wb_addr); + if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) + trim_top(md, last_granule_addr); + + if (is_available_memory(md)) { + if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) >= max_addr) { + if (md->phys_addr >= max_addr) + continue; + md->num_pages = (max_addr - md->phys_addr) >> EFI_PAGE_SHIFT; + first_non_wb_addr = max_addr; + } + + if (total_mem >= mem_limit) + continue; + + if (total_mem + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) { + unsigned long limit_addr = md->phys_addr; + + limit_addr += mem_limit - total_mem; + limit_addr = GRANULEROUNDDOWN(limit_addr); + + if (md->phys_addr > limit_addr) + continue; + + md->num_pages = (limit_addr - md->phys_addr) >> + EFI_PAGE_SHIFT; + first_non_wb_addr = max_addr = md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT); + } + total_mem += (md->num_pages << EFI_PAGE_SHIFT); + + if (md->num_pages == 0) + continue; + + curr.start = PAGE_OFFSET + md->phys_addr; + curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT); + + if (!prev_valid) { + prev = curr; + prev_valid = 1; + } else { + if (curr.start < prev.start) + printk(KERN_ERR "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; + } + } + } + } + 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_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 @ %lx\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", + __FUNCTION__); + continue; + } + + if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE) + panic("Woah! 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 + (md->num_pages << EFI_PAGE_SHIFT), + vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE); +#endif + return __va(md->phys_addr); + } + printk(KERN_WARNING "%s: no PAL-code memory-descriptor found", + __FUNCTION__); + return NULL; +} + +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 */ + 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); + if (end != cp) + break; + cp = end; + } else if (memcmp(cp, "max_addr=", 9) == 0) { + cp += 9; + max_addr = GRANULEROUNDDOWN(memparse(cp, &end)); + if (end != cp) + break; + cp = end; + } else { + while (*cp != ' ' && *cp) + ++cp; + while (*cp == ' ') + ++cp; + } + } + if (max_addr != ~0UL) + printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 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 incorrect\n"); + if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0) + printk(KERN_WARNING "Warning: EFI system table major version mismatch: " + "got %d.%02d, expected %d.%02d\n", + 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 < (int) sizeof(vendor) && *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); + + for (i = 0; i < (int) 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); + } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) { + efi.hcdp = __va(config_tables[i].table); + printk(" HCDP=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 << EFI_PAGE_SHIFT), + md->num_pages >> (20 - EFI_PAGE_SHIFT)); + } + } +#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; + } + + /* + * 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; +} + +u32 +efi_mem_type (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 < (md->num_pages << EFI_PAGE_SHIFT)) + return md->type; + } + return 0; +} + +u64 +efi_mem_attributes (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 < (md->num_pages << EFI_PAGE_SHIFT)) + return md->attribute; + } + return 0; +} +EXPORT_SYMBOL(efi_mem_attributes); + +int +valid_phys_addr_range (unsigned long phys_addr, unsigned long *size) +{ + 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 < (md->num_pages << EFI_PAGE_SHIFT)) { + if (!(md->attribute & EFI_MEMORY_WB)) + return 0; + + if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr) + *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr; + return 1; + } + } + return 0; +} + +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; +} |