[mirror_ubuntu-artful-kernel.git] / include / asm-i386 / kexec.h

#ifndef _I386_KEXEC_H
#define _I386_KEXEC_H

#define PA_CONTROL_PAGE  0
#define VA_CONTROL_PAGE  1
#define PA_PGD           2
#define VA_PGD           3
#define PA_PTE_0         4
#define VA_PTE_0         5
#define PA_PTE_1         6
#define VA_PTE_1         7
#ifdef CONFIG_X86_PAE
#define PA_PMD_0         8
#define VA_PMD_0         9
#define PA_PMD_1         10
#define VA_PMD_1         11
#define PAGES_NR         12
#else
#define PAGES_NR         8
#endif

#ifndef __ASSEMBLY__

#include <asm/fixmap.h>
#include <asm/ptrace.h>
#include <asm/string.h>

/*
 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
 * I.e. Maximum page that is mapped directly into kernel memory,
 * and kmap is not required.
 *
 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
 * calculation for the amount of memory directly mappable into the
 * kernel memory space.
 */

/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
/* Maximum address we can reach in physical address mode */
#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
/* Maximum address we can use for the control code buffer */
#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE

#define KEXEC_CONTROL_CODE_SIZE	4096

/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_386

#define MAX_NOTE_BYTES 1024

/* CPU does not save ss and esp on stack if execution is already
 * running in kernel mode at the time of NMI occurrence. This code
 * fixes it.
 */
static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
					struct pt_regs *oldregs)
{
	memcpy(newregs, oldregs, sizeof(*newregs));
	newregs->esp = (unsigned long)&(oldregs->esp);
	__asm__ __volatile__(
			"xorl %%eax, %%eax\n\t"
			"movw %%ss, %%ax\n\t"
			:"=a"(newregs->xss));
}

/*
 * This function is responsible for capturing register states if coming
 * via panic otherwise just fix up the ss and esp if coming via kernel
 * mode exception.
 */
static inline void crash_setup_regs(struct pt_regs *newregs,
                                       struct pt_regs *oldregs)
{
       if (oldregs)
               crash_fixup_ss_esp(newregs, oldregs);
       else {
               __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
               __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
               __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
               __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
               __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
               __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
               __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
               __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
               __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
               __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
               __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
               __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
               __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));

               newregs->eip = (unsigned long)current_text_addr();
       }
}
asmlinkage NORET_TYPE void
relocate_kernel(unsigned long indirection_page,
		unsigned long control_page,
		unsigned long start_address,
		unsigned int has_pae) ATTRIB_NORET;

#endif /* __ASSEMBLY__ */

#endif /* _I386_KEXEC_H */
Commit	Line	Data
5033cba0 EB	1	#ifndef _I386_KEXEC_H
	2	#define _I386_KEXEC_H
	3
3566561b MD	4	#define PA_CONTROL_PAGE 0
	5	#define VA_CONTROL_PAGE 1
	6	#define PA_PGD 2
	7	#define VA_PGD 3
	8	#define PA_PTE_0 4
	9	#define VA_PTE_0 5
	10	#define PA_PTE_1 6
	11	#define VA_PTE_1 7
	12	#ifdef CONFIG_X86_PAE
	13	#define PA_PMD_0 8
	14	#define VA_PMD_0 9
	15	#define PA_PMD_1 10
	16	#define VA_PMD_1 11
	17	#define PAGES_NR 12
	18	#else
	19	#define PAGES_NR 8
	20	#endif
	21
	22	#ifndef __ASSEMBLY__
	23
5033cba0	24	#include <asm/fixmap.h>
e996e581	25	#include <asm/ptrace.h>
f05b6902	26	#include <asm/string.h>
5033cba0 EB	27
	28	/*
	29	* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
	30	* I.e. Maximum page that is mapped directly into kernel memory,
	31	* and kmap is not required.
	32	*
	33	* Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
	34	* calculation for the amount of memory directly mappable into the
	35	* kernel memory space.
	36	*/
	37
	38	/* Maximum physical address we can use pages from */
	39	#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
	40	/* Maximum address we can reach in physical address mode */
	41	#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
	42	/* Maximum address we can use for the control code buffer */
	43	#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
	44
	45	#define KEXEC_CONTROL_CODE_SIZE 4096
	46
	47	/* The native architecture */
	48	#define KEXEC_ARCH KEXEC_ARCH_386
	49
625f1c82	50	#define MAX_NOTE_BYTES 1024
625f1c82	51
e996e581 VG	52	/* CPU does not save ss and esp on stack if execution is already
	53	* running in kernel mode at the time of NMI occurrence. This code
	54	* fixes it.
	55	*/
	56	static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
	57	struct pt_regs *oldregs)
	58	{
	59	memcpy(newregs, oldregs, sizeof(*newregs));
	60	newregs->esp = (unsigned long)&(oldregs->esp);
	61	__asm__ __volatile__(
	62	"xorl %%eax, %%eax\n\t"
	63	"movw %%ss, %%ax\n\t"
	64	:"=a"(newregs->xss));
	65	}
	66
	67	/*
	68	* This function is responsible for capturing register states if coming
	69	* via panic otherwise just fix up the ss and esp if coming via kernel
	70	* mode exception.
	71	*/
	72	static inline void crash_setup_regs(struct pt_regs *newregs,
	73	struct pt_regs *oldregs)
	74	{
	75	if (oldregs)
	76	crash_fixup_ss_esp(newregs, oldregs);
	77	else {
	78	__asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
	79	__asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
	80	__asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
	81	__asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
	82	__asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
	83	__asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
	84	__asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
	85	__asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
	86	__asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
	87	__asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
	88	__asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
	89	__asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
	90	__asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
	91
	92	newregs->eip = (unsigned long)current_text_addr();
	93	}
	94	}
3566561b MD	95	asmlinkage NORET_TYPE void
	96	relocate_kernel(unsigned long indirection_page,
	97	unsigned long control_page,
	98	unsigned long start_address,
	99	unsigned int has_pae) ATTRIB_NORET;
	100
	101	#endif /* __ASSEMBLY__ */
e996e581	102
5033cba0	103	#endif /* _I386_KEXEC_H */