[net-next-2.6.git] / arch / x86 / kernel / trampoline.c

#include <linux/io.h>

#include <asm/trampoline.h>
#include <asm/pgtable.h>
#include <asm/e820.h>

#if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP)
#define __trampinit
#define __trampinitdata
#else
#define __trampinit __cpuinit
#define __trampinitdata __cpuinitdata
#endif

/* ready for x86_64 and x86 */
unsigned char *__trampinitdata trampoline_base;

void __init reserve_trampoline_memory(void)
{
	unsigned long mem;

	/* Has to be in very low memory so we can execute real-mode AP code. */
	mem = find_e820_area(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
	if (mem == -1L)
		panic("Cannot allocate trampoline\n");

	trampoline_base = __va(mem);
	reserve_early(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE");
}

/*
 * Currently trivial. Write the real->protected mode
 * bootstrap into the page concerned. The caller
 * has made sure it's suitably aligned.
 */
unsigned long __trampinit setup_trampoline(void)
{
	memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
	return virt_to_phys(trampoline_base);
}

void __init setup_trampoline_page_table(void)
{
#ifdef CONFIG_X86_32
	/* Copy kernel address range */
	clone_pgd_range(trampoline_pg_dir + KERNEL_PGD_BOUNDARY,
			swapper_pg_dir + KERNEL_PGD_BOUNDARY,
			min_t(unsigned long, KERNEL_PGD_PTRS,
			      KERNEL_PGD_BOUNDARY));

	/* Initialize low mappings */
	clone_pgd_range(trampoline_pg_dir,
			swapper_pg_dir + KERNEL_PGD_BOUNDARY,
			min_t(unsigned long, KERNEL_PGD_PTRS,
			      KERNEL_PGD_BOUNDARY));
#endif
}
Commit	Line	Data
	1	#include <linux/io.h>
	2
	3	#include <asm/trampoline.h>
	4	#include <asm/pgtable.h>
	5	#include <asm/e820.h>
	6
	7	#if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP)
	8	#define __trampinit
	9	#define __trampinitdata
	10	#else
	11	#define __trampinit __cpuinit
	12	#define __trampinitdata __cpuinitdata
	13	#endif
	14
	15	/* ready for x86_64 and x86 */
	16	unsigned char *__trampinitdata trampoline_base;
	17
	18	void __init reserve_trampoline_memory(void)
	19	{
	20	unsigned long mem;
	21
	22	/* Has to be in very low memory so we can execute real-mode AP code. */
	23	mem = find_e820_area(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
	24	if (mem == -1L)
	25	panic("Cannot allocate trampoline\n");
	26
	27	trampoline_base = __va(mem);
	28	reserve_early(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE");
	29	}
	30
	31	/*
	32	* Currently trivial. Write the real->protected mode
	33	* bootstrap into the page concerned. The caller
	34	* has made sure it's suitably aligned.
	35	*/
	36	unsigned long __trampinit setup_trampoline(void)
	37	{
	38	memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
	39	return virt_to_phys(trampoline_base);
	40	}
	41
	42	void __init setup_trampoline_page_table(void)
	43	{
	44	#ifdef CONFIG_X86_32
	45	/* Copy kernel address range */
	46	clone_pgd_range(trampoline_pg_dir + KERNEL_PGD_BOUNDARY,
	47	swapper_pg_dir + KERNEL_PGD_BOUNDARY,
	48	min_t(unsigned long, KERNEL_PGD_PTRS,
	49	KERNEL_PGD_BOUNDARY));
	50
	51	/* Initialize low mappings */
	52	clone_pgd_range(trampoline_pg_dir,
	53	swapper_pg_dir + KERNEL_PGD_BOUNDARY,
	54	min_t(unsigned long, KERNEL_PGD_PTRS,
	55	KERNEL_PGD_BOUNDARY));
	56	#endif
	57	}