Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pul x86/efi changes from Ingo Molnar:
 "This tree adds an EFI bootloader handover protocol, which, once
  supported on the bootloader side, will make bootup faster and might
  result in simpler bootloaders.

  The other change activates the EFI wall clock time accessors on x86-64
  as well, instead of the legacy RTC readout."

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, efi: Handover Protocol
  x86-64/efi: Use EFI to deal with platform wall clock

7 files changed, 154 insertions, 109 deletions

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 4e85f5f85837..b3e0227df2c9 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -729,32 +729,68 @@ fail:
  * need to create one ourselves (usually the bootloader would create
  * one for us).
  */
-static efi_status_t make_boot_params(struct boot_params *boot_params,
-                                     efi_loaded_image_t *image,
-                                     void *handle)
+struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
 {
-        struct efi_info *efi = &boot_params->efi_info;
-        struct apm_bios_info *bi = &boot_params->apm_bios_info;
-        struct sys_desc_table *sdt = &boot_params->sys_desc_table;
-        struct e820entry *e820_map = &boot_params->e820_map[0];
-        struct e820entry *prev = NULL;
-        struct setup_header *hdr = &boot_params->hdr;
-        unsigned long size, key, desc_size, _size;
-        efi_memory_desc_t *mem_map;
-        void *options = image->load_options;
-        u32 load_options_size = image->load_options_size / 2; /* ASCII */
+        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;
-        __u32 desc_version;
         unsigned long cmdline;
-        u8 nr_entries;
         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("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
+                return NULL;
+        }
+
+        status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
+        if (status != EFI_SUCCESS) {
+                efi_printk("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;
 
@@ -791,18 +827,36 @@ static efi_status_t make_boot_params(struct boot_params *boot_params,
         hdr->ramdisk_image = 0;
         hdr->ramdisk_size = 0;
 
-        status = handle_ramdisks(image, hdr);
-        if (status != EFI_SUCCESS)
-                goto free_cmdline;
-
-        setup_graphics(boot_params);
-
         /* Clear APM BIOS info */
         memset(bi, 0, sizeof(*bi));
 
         memset(sdt, 0, sizeof(*sdt));
 
-        memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
+        status = handle_ramdisks(image, hdr);
+        if (status != EFI_SUCCESS)
+                goto fail2;
+
+        return boot_params;
+fail2:
+        if (options_size)
+                low_free(options_size, hdr->cmd_line_ptr);
+fail:
+        low_free(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;
+        u8 nr_entries;
+        int i;
 
         size = sizeof(*mem_map) * 32;
 
@@ -811,7 +865,7 @@ again:
         _size = size;
         status = low_alloc(size, 1, (unsigned long *)&mem_map);
         if (status != EFI_SUCCESS)
-                goto free_cmdline;
+                return status;
 
         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
                                 mem_map, &key, &desc_size, &desc_version);
@@ -823,6 +877,7 @@ 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;
@@ -906,61 +961,13 @@ again:
 
 free_mem_map:
         low_free(_size, (unsigned long)mem_map);
-free_cmdline:
-        if (options_size)
-                low_free(options_size, hdr->cmd_line_ptr);
-fail:
         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)
+static efi_status_t relocate_kernel(struct setup_header *hdr)
 {
-        struct boot_params *boot_params;
         unsigned long start, nr_pages;
-        struct desc_ptr *gdt, *idt;
-        efi_loaded_image_t *image;
-        struct setup_header *hdr;
         efi_status_t status;
-        efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
-        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;
-
-        status = efi_call_phys3(sys_table->boottime->handle_protocol,
-                                handle, &proto, (void *)&image);
-        if (status != EFI_SUCCESS) {
-                efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
-                goto fail;
-        }
-
-        status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
-        if (status != EFI_SUCCESS) {
-                efi_printk("Failed to alloc lowmem for boot params\n");
-                goto fail;
-        }
-
-        memset(boot_params, 0x0, 0x4000);
-
-        hdr = &boot_params->hdr;
-
-        /* 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;
 
         /*
          * The EFI firmware loader could have placed the kernel image
@@ -978,16 +985,40 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
         if (status != EFI_SUCCESS) {
                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
                                    &start);
-                if (status != EFI_SUCCESS) {
+                if (status != EFI_SUCCESS)
                         efi_printk("Failed to alloc mem for kernel\n");
-                        goto fail;
-                }
         }
 
+        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;
-        hdr->pref_address = (__u64)(unsigned long)image->image_base;
 
-        memcpy((void *)start, image->image_base, image->image_size);
+        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);
 
         status = efi_call_phys3(sys_table->boottime->allocate_pool,
                                 EFI_LOADER_DATA, sizeof(*gdt),
@@ -1015,7 +1046,18 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
         idt->size = 0;
         idt->address = 0;
 
-        status = make_boot_params(boot_params, image, handle);
+        /*
+         * 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;
 
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index c85e3ac99bba..aa4aaf1b2380 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -42,6 +42,16 @@ ENTRY(startup_32)
          */
         add     $0x4, %esp
 
+        call    make_boot_params
+        cmpl    $0, %eax
+        je      1f
+        movl    0x4(%esp), %esi
+        movl    (%esp), %ecx
+        pushl   %eax
+        pushl   %esi
+        pushl   %ecx
+
+        .org 0x30,0x90
         call    efi_main
         cmpl    $0, %eax
         movl    %eax, %esi
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 87e03a13d8e3..2c4b171eec33 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -209,6 +209,16 @@ ENTRY(startup_64)
         .org 0x210
         mov     %rcx, %rdi
         mov     %rdx, %rsi
+        pushq   %rdi
+        pushq   %rsi
+        call    make_boot_params
+        cmpq    $0,%rax
+        je      1f
+        mov     %rax, %rdx
+        popq    %rsi
+        popq    %rdi
+
+        .org 0x230,0x90
         call    efi_main
         movq    %rax,%rsi
         cmpq    $0,%rax
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 9b9c6475b361..b4e15dd6786a 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -283,7 +283,7 @@ _start:
         # Part 2 of the header, from the old setup.S
 
                 .ascii  "HdrS"          # header signature
-                .word   0x020a          # header version number (>= 0x0105)
+                .word   0x020b          # header version number (>= 0x0105)
                                         # or else old loadlin-1.5 will fail)
                 .globl realmode_swtch
 realmode_swtch: .word   0, 0            # default_switch, SETUPSEG
@@ -401,6 +401,8 @@ pref_address:		.quad LOAD_PHYSICAL_ADDR	# preferred load addr
 #define INIT_SIZE VO_INIT_SIZE
 #endif
 init_size:              .long INIT_SIZE         # kernel initialization size
+handover_offset:        .long 0x30              # offset to the handover
+                                                # protocol entry point
 
 # End of setup header #####################################################
 
diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index eb45aa6b1f27..2ad874cb661c 100644
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -66,6 +66,7 @@ struct setup_header {
         __u64   setup_data;
         __u64   pref_address;
         __u32   init_size;
+        __u32   handover_offset;
 } __attribute__((packed));
 
 struct sys_desc_table {
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a718e0d23503..931930a96160 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -919,11 +919,13 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
 
         /*
          * On success we use clflush, when the CPU supports it to
-         * avoid the wbindv. If the CPU does not support it and in the
-         * error case we fall back to cpa_flush_all (which uses
-         * wbindv):
+         * avoid the wbindv. If the CPU does not support it, in the
+         * error case, and during early boot (for EFI) we fall back
+         * to cpa_flush_all (which uses wbinvd):
          */
-        if (!ret && cpu_has_clflush) {
+        if (early_boot_irqs_disabled)
+                __cpa_flush_all((void *)(long)cache);
+        else if (!ret && cpu_has_clflush) {
                 if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
                         cpa_flush_array(addr, numpages, cache,
                                         cpa.flags, pages);
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 92660edaa1e7..2dc29f51e75a 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -234,22 +234,7 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
         return status;
 }
 
-static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
-                                             efi_time_cap_t *tc)
-{
-        unsigned long flags;
-        efi_status_t status;
-
-        spin_lock_irqsave(&rtc_lock, flags);
-        efi_call_phys_prelog();
-        status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
-                                virt_to_phys(tc));
-        efi_call_phys_epilog();
-        spin_unlock_irqrestore(&rtc_lock, flags);
-        return status;
-}
-
-int efi_set_rtc_mmss(unsigned long nowtime)
+static int efi_set_rtc_mmss(unsigned long nowtime)
 {
         int real_seconds, real_minutes;
         efi_status_t    status;
@@ -278,7 +263,7 @@ int efi_set_rtc_mmss(unsigned long nowtime)
         return 0;
 }
 
-unsigned long efi_get_time(void)
+static unsigned long efi_get_time(void)
 {
         efi_status_t status;
         efi_time_t eft;
@@ -621,18 +606,13 @@ static int __init efi_runtime_init(void)
         }
         /*
          * We will only need *early* access to the following
-         * two EFI runtime services before set_virtual_address_map
+         * EFI runtime service before set_virtual_address_map
          * is invoked.
          */
-        efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
         efi_phys.set_virtual_address_map =
                 (efi_set_virtual_address_map_t *)
                 runtime->set_virtual_address_map;
-        /*
-         * Make efi_get_time can be called before entering
-         * virtual mode.
-         */
-        efi.get_time = phys_efi_get_time;
+
         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 
         return 0;
@@ -720,12 +700,10 @@ void __init efi_init(void)
                 efi_enabled = 0;
                 return;
         }
-#ifdef CONFIG_X86_32
         if (efi_native) {
                 x86_platform.get_wallclock = efi_get_time;
                 x86_platform.set_wallclock = efi_set_rtc_mmss;
         }
-#endif
 
 #if EFI_DEBUG
         print_efi_memmap();