[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kernel / trampoline.c

#include <linux/io.h>

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

/* ready for x86_64 and x86 */
unsigned char *trampoline_base = __va(TRAMPOLINE_BASE);

void __init reserve_trampoline_memory(void)
{
#ifdef CONFIG_X86_32
	/*
	 * But first pinch a few for the stack/trampoline stuff
	 * FIXME: Don't need the extra page at 4K, but need to fix
	 * trampoline before removing it. (see the GDT stuff)
	 */
	reserve_early(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE");
#endif
	/* Has to be in very low memory so we can execute real-mode AP code. */
	reserve_early(TRAMPOLINE_BASE, TRAMPOLINE_BASE + 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 setup_trampoline(void)
{
	memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
	return virt_to_phys(trampoline_base);
}
Commit	Line	Data
77ad386e IM	1	#include <linux/io.h>
	2
	3	#include <asm/trampoline.h>
3e1e9002	4	#include <asm/e820.h>
77ad386e	5
a4c81cf6	6	/* ready for x86_64 and x86 */
77ad386e IM	7	unsigned char *trampoline_base = __va(TRAMPOLINE_BASE);
77ad386e IM	8
3e1e9002 RW	9	void __init reserve_trampoline_memory(void)
	10	{
	11	#ifdef CONFIG_X86_32
	12	/*
	13	* But first pinch a few for the stack/trampoline stuff
	14	* FIXME: Don't need the extra page at 4K, but need to fix
	15	* trampoline before removing it. (see the GDT stuff)
	16	*/
	17	reserve_early(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE");
	18	#endif
	19	/* Has to be in very low memory so we can execute real-mode AP code. */
	20	reserve_early(TRAMPOLINE_BASE, TRAMPOLINE_BASE + TRAMPOLINE_SIZE,
	21	"TRAMPOLINE");
	22	}
	23
77ad386e IM	24	/*
	25	* Currently trivial. Write the real->protected mode
	26	* bootstrap into the page concerned. The caller
	27	* has made sure it's suitably aligned.
	28	*/
	29	unsigned long setup_trampoline(void)
	30	{
3e1e9002	31	memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
77ad386e IM	32	return virt_to_phys(trampoline_base);
77ad386e IM	33	}