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Commit b429dbf6 authored by Jarkko Sakkinen's avatar Jarkko Sakkinen Committed by H. Peter Anvin
Browse files

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: default avatarJarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-19-git-send-email-jarkko.sakkinen@intel.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 8e029fcd

arch/x86/include/asm/realmode.h

+2 −3
Original line number Diff line number Diff line
@@ -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;

arch/x86/kernel/acpi/sleep.c

+1 −1
Original line number Diff line number Diff line
@@ -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");

arch/x86/kernel/realmode.c

+25 −32
Original line number Diff line number Diff line
@@ -5,8 +5,7 @@ 
#include <asm/pgtable.h>

#include <asm/realmode.h>



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;

arch/x86/kernel/reboot.c

+1 −1
Original line number Diff line number Diff line
@@ -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();

arch/x86/kernel/smpboot.c

+2 −2
Original line number Diff line number Diff line
@@ -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;