From b429dbf6e866bd6dadb56fae66f61f611cde57ff Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Tue, 8 May 2012 21:22:41 +0300 Subject: [PATCH] x86, realmode: don't copy real_mode_header Replaced copying of real_mode_header with a pointer to beginning of RM memory. Signed-off-by: Jarkko Sakkinen Link: http://lkml.kernel.org/r/1336501366-28617-19-git-send-email-jarkko.sakkinen@intel.com Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/realmode.h | 5 +-- arch/x86/kernel/acpi/sleep.c | 2 +- arch/x86/kernel/realmode.c | 57 +++++++++++++---------------- arch/x86/kernel/reboot.c | 2 +- arch/x86/kernel/smpboot.c | 4 +- arch/x86/kernel/tboot.c | 2 +- arch/x86/realmode/rm/header.S | 1 - arch/x86/realmode/rm/realmode.lds.S | 1 - arch/x86/realmode/rmpiggy.S | 2 + drivers/acpi/sleep.c | 2 +- 10 files changed, 35 insertions(+), 43 deletions(-) diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h index 1bfc74d213a4..d3ae49f4c3ef 100644 --- a/arch/x86/include/asm/realmode.h +++ b/arch/x86/include/asm/realmode.h @@ -8,7 +8,6 @@ struct real_mode_header { u32 text_start; u32 ro_end; - u32 end; /* reboot */ #ifdef CONFIG_X86_32 u32 machine_real_restart_asm; @@ -30,8 +29,8 @@ struct real_mode_header { #endif } __attribute__((__packed__)); -extern struct real_mode_header real_mode_header; -extern unsigned char *real_mode_base; +extern struct real_mode_header *real_mode_header; +extern unsigned char real_mode_blob_end[]; extern unsigned long init_rsp; extern unsigned long initial_code; diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index d941b62da4b6..6ca3f54ebe7d 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -38,7 +38,7 @@ asmlinkage void acpi_enter_s3(void) int acpi_suspend_lowlevel(void) { struct wakeup_header *header = - (struct wakeup_header *) __va(real_mode_header.wakeup_header); + (struct wakeup_header *) __va(real_mode_header->wakeup_header); if (header->signature != WAKEUP_HEADER_SIGNATURE) { printk(KERN_ERR "wakeup header does not match\n"); diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c index e7bf82a409bf..632c810ec8ea 100644 --- a/arch/x86/kernel/realmode.c +++ b/arch/x86/kernel/realmode.c @@ -5,8 +5,7 @@ #include #include -unsigned char *real_mode_base; -struct real_mode_header real_mode_header; +struct real_mode_header *real_mode_header; void __init setup_real_mode(void) { @@ -17,33 +16,32 @@ void __init setup_real_mode(void) u32 *ptr; u16 *seg; int i; + unsigned char *base; - struct real_mode_header *header = - (struct real_mode_header *) real_mode_blob; - - size_t size = PAGE_ALIGN(header->end); + size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob); /* Has to be in very low memory so we can execute real-mode AP code. */ mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE); if (!mem) panic("Cannot allocate trampoline\n"); - real_mode_base = __va(mem); + base = __va(mem); memblock_reserve(mem, size); + real_mode_header = (struct real_mode_header *) base; printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n", - real_mode_base, (unsigned long long)mem, size); + base, (unsigned long long)mem, size); - memcpy(real_mode_base, real_mode_blob, size); + memcpy(base, real_mode_blob, size); - real_mode_seg = __pa(real_mode_base) >> 4; + real_mode_seg = __pa(base) >> 4; rel = (u32 *) real_mode_relocs; /* 16-bit segment relocations. */ count = rel[0]; rel = &rel[1]; for (i = 0; i < count; i++) { - seg = (u16 *) (real_mode_base + rel[i]); + seg = (u16 *) (base + rel[i]); *seg = real_mode_seg; } @@ -51,25 +49,21 @@ void __init setup_real_mode(void) count = rel[i]; rel = &rel[i + 1]; for (i = 0; i < count; i++) { - ptr = (u32 *) (real_mode_base + rel[i]); - *ptr += __pa(real_mode_base); + ptr = (u32 *) (base + rel[i]); + *ptr += __pa(base); } - /* Copied header will contain relocated physical addresses. */ - memcpy(&real_mode_header, real_mode_base, - sizeof(struct real_mode_header)); - #ifdef CONFIG_X86_32 - *((u32 *)__va(real_mode_header.startup_32_smp)) = __pa(startup_32_smp); - *((u32 *)__va(real_mode_header.boot_gdt)) = __pa(boot_gdt); + *((u32 *)__va(real_mode_header->startup_32_smp)) = __pa(startup_32_smp); + *((u32 *)__va(real_mode_header->boot_gdt)) = __pa(boot_gdt); #else - *((u64 *) __va(real_mode_header.startup_64_smp)) = + *((u64 *) __va(real_mode_header->startup_64_smp)) = (u64)secondary_startup_64; - *((u64 *) __va(real_mode_header.level3_ident_pgt)) = + *((u64 *) __va(real_mode_header->level3_ident_pgt)) = __pa(level3_ident_pgt) + _KERNPG_TABLE; - *((u64 *) __va(real_mode_header.level3_kernel_pgt)) = + *((u64 *) __va(real_mode_header->level3_kernel_pgt)) = __pa(level3_kernel_pgt) + _KERNPG_TABLE; #endif } @@ -82,23 +76,22 @@ void __init setup_real_mode(void) */ static int __init set_real_mode_permissions(void) { - size_t all_size = - PAGE_ALIGN(real_mode_header.end) - - __pa(real_mode_base); + unsigned char *base = (unsigned char *) real_mode_header; + size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob); size_t ro_size = - PAGE_ALIGN(real_mode_header.ro_end) - - __pa(real_mode_base); + PAGE_ALIGN(real_mode_header->ro_end) - + __pa(base); size_t text_size = - PAGE_ALIGN(real_mode_header.ro_end) - - real_mode_header.text_start; + PAGE_ALIGN(real_mode_header->ro_end) - + real_mode_header->text_start; unsigned long text_start = - (unsigned long) __va(real_mode_header.text_start); + (unsigned long) __va(real_mode_header->text_start); - set_memory_nx((unsigned long) real_mode_base, all_size >> PAGE_SHIFT); - set_memory_ro((unsigned long) real_mode_base, ro_size >> PAGE_SHIFT); + set_memory_nx((unsigned long) base, size >> PAGE_SHIFT); + set_memory_ro((unsigned long) base, ro_size >> PAGE_SHIFT); set_memory_x((unsigned long) text_start, text_size >> PAGE_SHIFT); return 0; diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 050eff29a4bb..658f856f09a3 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -336,7 +336,7 @@ core_initcall(reboot_init); void machine_real_restart(unsigned int type) { void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int)) - real_mode_header.machine_real_restart_asm; + real_mode_header->machine_real_restart_asm; local_irq_disable(); diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index c7971ea74bd0..b8c0661e2341 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -665,9 +665,9 @@ static void __cpuinit announce_cpu(int cpu, int apicid) static int __cpuinit do_boot_cpu(int apicid, int cpu) { volatile u32 *trampoline_status = - (volatile u32 *) __va(real_mode_header.trampoline_status); + (volatile u32 *) __va(real_mode_header->trampoline_status); /* start_ip had better be page-aligned! */ - unsigned long start_ip = real_mode_header.trampoline_data; + unsigned long start_ip = real_mode_header->trampoline_data; unsigned long boot_error = 0; int timeout; diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index c136e2325062..65adda4fde93 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -202,7 +202,7 @@ static int tboot_setup_sleep(void) } tboot->acpi_sinfo.kernel_s3_resume_vector = - real_mode_header.wakeup_start; + real_mode_header->wakeup_start; return 0; } diff --git a/arch/x86/realmode/rm/header.S b/arch/x86/realmode/rm/header.S index a91ec8f6b15f..c83005c4d455 100644 --- a/arch/x86/realmode/rm/header.S +++ b/arch/x86/realmode/rm/header.S @@ -12,7 +12,6 @@ GLOBAL(real_mode_header) .long pa_text_start .long pa_ro_end - .long pa_end #ifdef CONFIG_X86_32 .long pa_machine_real_restart_asm #endif diff --git a/arch/x86/realmode/rm/realmode.lds.S b/arch/x86/realmode/rm/realmode.lds.S index 4d4afcaf5f02..86b2e8d6b1f1 100644 --- a/arch/x86/realmode/rm/realmode.lds.S +++ b/arch/x86/realmode/rm/realmode.lds.S @@ -65,7 +65,6 @@ SECTIONS .signature : { *(.signature) } - pa_end = .; /DISCARD/ : { *(.note*) diff --git a/arch/x86/realmode/rmpiggy.S b/arch/x86/realmode/rmpiggy.S index fd72a99d12ae..204c6ece0e97 100644 --- a/arch/x86/realmode/rmpiggy.S +++ b/arch/x86/realmode/rmpiggy.S @@ -13,6 +13,8 @@ GLOBAL(real_mode_blob) .incbin "arch/x86/realmode/rm/realmode.bin" END(real_mode_blob) +GLOBAL(real_mode_blob_end); + GLOBAL(real_mode_relocs) .incbin "arch/x86/realmode/rm/realmode.relocs" END(real_mode_relocs) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index e77aa4a1c9f6..06139005c4dd 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -93,7 +93,7 @@ static struct notifier_block tts_notifier = { static int acpi_sleep_prepare(u32 acpi_state) { #ifdef CONFIG_ACPI_SLEEP - unsigned long wakeup_pa = real_mode_header.wakeup_start; + unsigned long wakeup_pa = real_mode_header->wakeup_start; /* do we have a wakeup address for S2 and S3? */ if (acpi_state == ACPI_STATE_S3) { if (!wakeup_pa) -- 2.20.1