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

#ifndef _ARM_KEXEC_H
#define _ARM_KEXEC_H

#ifdef CONFIG_KEXEC

/* 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 (-1UL)

#define KEXEC_CONTROL_PAGE_SIZE	4096

#define KEXEC_ARCH KEXEC_ARCH_ARM

#define KEXEC_ARM_ATAGS_OFFSET  0x1000
#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000

#ifndef __ASSEMBLY__

/**
 * crash_setup_regs() - save registers for the panic kernel
 * @newregs: registers are saved here
 * @oldregs: registers to be saved (may be %NULL)
 *
 * Function copies machine registers from @oldregs to @newregs. If @oldregs is
 * %NULL then current registers are stored there.
 */
static inline void crash_setup_regs(struct pt_regs *newregs,
				    struct pt_regs *oldregs)
{
	if (oldregs) {
		memcpy(newregs, oldregs, sizeof(*newregs));
	} else {
		__asm__ __volatile__ (
			"stmia	%[regs_base], {r0-r12}\n\t"
			"mov	%[_ARM_sp], sp\n\t"
			"str	lr, %[_ARM_lr]\n\t"
			"adr	%[_ARM_pc], 1f\n\t"
			"mrs	%[_ARM_cpsr], cpsr\n\t"
		"1:"
			: [_ARM_pc] "=r" (newregs->ARM_pc),
			  [_ARM_cpsr] "=r" (newregs->ARM_cpsr),
			  [_ARM_sp] "=r" (newregs->ARM_sp),
			  [_ARM_lr] "=o" (newregs->ARM_lr)
			: [regs_base] "r" (&newregs->ARM_r0)
			: "memory"
		);
	}
}

/* Function pointer to optional machine-specific reinitialization */
extern void (*kexec_reinit)(void);

static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
{
	return phys_to_idmap(phys);
}
#define phys_to_boot_phys phys_to_boot_phys

static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
{
	return idmap_to_phys(entry);
}
#define boot_phys_to_phys boot_phys_to_phys

static inline unsigned long page_to_boot_pfn(struct page *page)
{
	return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
}
#define page_to_boot_pfn page_to_boot_pfn

static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
{
	return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
}
#define boot_pfn_to_page boot_pfn_to_page

#endif /* __ASSEMBLY__ */

#endif /* CONFIG_KEXEC */

#endif /* _ARM_KEXEC_H */
Commit	Line	Data
c587e4a6 RP	1	#ifndef _ARM_KEXEC_H
	2	#define _ARM_KEXEC_H
	3
	4	#ifdef CONFIG_KEXEC
	5
	6	/* Maximum physical address we can use pages from */
	7	#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
	8	/* Maximum address we can reach in physical address mode */
	9	#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
	10	/* Maximum address we can use for the control code buffer */
5ce94e9e	11	#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
c587e4a6	12
163f6876	13	#define KEXEC_CONTROL_PAGE_SIZE 4096
c587e4a6 RP	14
	15	#define KEXEC_ARCH KEXEC_ARCH_ARM
	16
4cd9d6f7 RP	17	#define KEXEC_ARM_ATAGS_OFFSET 0x1000
	18	#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
	19
c587e4a6 RP	20	#ifndef __ASSEMBLY__
c587e4a6 RP	21
24b776bf MW	22	/**
	23	* crash_setup_regs() - save registers for the panic kernel
	24	* @newregs: registers are saved here
	25	* @oldregs: registers to be saved (may be %NULL)
	26	*
	27	* Function copies machine registers from @oldregs to @newregs. If @oldregs is
	28	* %NULL then current registers are stored there.
	29	*/
c587e4a6	30	static inline void crash_setup_regs(struct pt_regs *newregs,
24b776bf MW	31	struct pt_regs *oldregs)
	32	{
	33	if (oldregs) {
	34	memcpy(newregs, oldregs, sizeof(*newregs));
	35	} else {
cd849ae9 DM	36	__asm__ __volatile__ (
	37	"stmia %[regs_base], {r0-r12}\n\t"
	38	"mov %[_ARM_sp], sp\n\t"
	39	"str lr, %[_ARM_lr]\n\t"
	40	"adr %[_ARM_pc], 1f\n\t"
	41	"mrs %[_ARM_cpsr], cpsr\n\t"
	42	"1:"
	43	: [_ARM_pc] "=r" (newregs->ARM_pc),
	44	[_ARM_cpsr] "=r" (newregs->ARM_cpsr),
	45	[_ARM_sp] "=r" (newregs->ARM_sp),
	46	[_ARM_lr] "=o" (newregs->ARM_lr)
	47	: [regs_base] "r" (&newregs->ARM_r0)
	48	: "memory"
	49	);
24b776bf MW	50	}
24b776bf MW	51	}
c587e4a6	52
868d172b EC	53	/* Function pointer to optional machine-specific reinitialization */
	54	extern void (*kexec_reinit)(void);
	55
0719392a RK	56	static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
	57	{
	58	return phys_to_idmap(phys);
	59	}
	60	#define phys_to_boot_phys phys_to_boot_phys
	61
	62	static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
	63	{
	64	return idmap_to_phys(entry);
	65	}
	66	#define boot_phys_to_phys boot_phys_to_phys
	67
	68	static inline unsigned long page_to_boot_pfn(struct page *page)
	69	{
	70	return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
	71	}
	72	#define page_to_boot_pfn page_to_boot_pfn
	73
	74	static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
	75	{
	76	return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
	77	}
	78	#define boot_pfn_to_page boot_pfn_to_page
	79
c587e4a6 RP	80	#endif /* __ASSEMBLY__ */
	81
	82	#endif /* CONFIG_KEXEC */
	83
	84	#endif /* _ARM_KEXEC_H */