[linux-block.git] / arch / powerpc / include / asm / vdso_datapage.h

#ifndef _VDSO_DATAPAGE_H
#define _VDSO_DATAPAGE_H
#ifdef __KERNEL__

/*
 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
 * 		      IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


/*
 * Note about this structure:
 *
 * This structure was historically called systemcfg and exposed to
 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
 * ABI issue as some proprietary software started relying on being able
 * to mmap() it, thus we have to keep the base layout at least for a
 * few kernel versions.
 *
 * However, since ppc32 doesn't suffer from this backward handicap,
 * a simpler version of the data structure is used there with only the
 * fields actually used by the vDSO.
 *
 */

/*
 * If the major version changes we are incompatible.
 * Minor version changes are a hint.
 */
#define SYSTEMCFG_MAJOR 1
#define SYSTEMCFG_MINOR 1

#ifndef __ASSEMBLY__

#include <linux/unistd.h>

#define SYSCALL_MAP_SIZE      ((__NR_syscalls + 31) / 32)

/*
 * So here is the ppc64 backward compatible version
 */

#ifdef CONFIG_PPC64

struct vdso_data {
	__u8  eye_catcher[16];		/* Eyecatcher: SYSTEMCFG:PPC64	0x00 */
	struct {			/* Systemcfg version numbers	     */
		__u32 major;		/* Major number			0x10 */
		__u32 minor;		/* Minor number			0x14 */
	} version;

	/* Note about the platform flags: it now only contains the lpar
	 * bit. The actual platform number is dead and burried
	 */
	__u32 platform;			/* Platform flags		0x18 */
	__u32 processor;		/* Processor type		0x1C */
	__u64 processorCount;		/* # of physical processors	0x20 */
	__u64 physicalMemorySize;	/* Size of real memory(B)	0x28 */
	__u64 tb_orig_stamp;		/* Timebase at boot		0x30 */
	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
	__u64 tb_to_xs;			/* Inverse of TB to 2^20	0x40 */
	__u64 stamp_xsec;		/*				0x48 */
	__u64 tb_update_count;		/* Timebase atomicity ctr	0x50 */
	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
	__u32 dcache_size;		/* L1 d-cache size		0x60 */
	__u32 dcache_line_size;		/* L1 d-cache line size		0x64 */
	__u32 icache_size;		/* L1 i-cache size		0x68 */
	__u32 icache_line_size;		/* L1 i-cache line size		0x6C */

	/* those additional ones don't have to be located anywhere
	 * special as they were not part of the original systemcfg
	 */
	__u32 dcache_block_size;		/* L1 d-cache block size     */
	__u32 icache_block_size;		/* L1 i-cache block size     */
	__u32 dcache_log_block_size;		/* L1 d-cache log block size */
	__u32 icache_log_block_size;		/* L1 i-cache log block size */
	__s32 wtom_clock_sec;			/* Wall to monotonic clock */
	__s32 wtom_clock_nsec;
   	__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
};

#else /* CONFIG_PPC64 */

/*
 * And here is the simpler 32 bits version
 */
struct vdso_data {
	__u64 tb_orig_stamp;		/* Timebase at boot		0x30 */
	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
	__u64 tb_to_xs;			/* Inverse of TB to 2^20	0x40 */
	__u64 stamp_xsec;		/*				0x48 */
	__u32 tb_update_count;		/* Timebase atomicity ctr	0x50 */
	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
	__s32 wtom_clock_sec;			/* Wall to monotonic clock */
	__s32 wtom_clock_nsec;
   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
	__u32 dcache_block_size;	/* L1 d-cache block size     */
	__u32 icache_block_size;	/* L1 i-cache block size     */
	__u32 dcache_log_block_size;	/* L1 d-cache log block size */
	__u32 icache_log_block_size;	/* L1 i-cache log block size */
};

#endif /* CONFIG_PPC64 */

#ifdef __KERNEL__
extern struct vdso_data *vdso_data;
#endif

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */
#endif /* _SYSTEMCFG_H */
Commit	Line	Data
a7f290da BH	1	#ifndef _VDSO_DATAPAGE_H
a7f290da BH	2	#define _VDSO_DATAPAGE_H
88ced031	3	#ifdef __KERNEL__
a7f290da BH	4
	5	/*
	6	* Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
	7	* Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
	8	* IBM Corp.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16
	17	/*
	18	* Note about this structure:
	19	*
	20	* This structure was historically called systemcfg and exposed to
	21	* userland via /proc/ppc64/systemcfg. Unfortunately, this became an
	22	* ABI issue as some proprietary software started relying on being able
	23	* to mmap() it, thus we have to keep the base layout at least for a
	24	* few kernel versions.
	25	*
	26	* However, since ppc32 doesn't suffer from this backward handicap,
	27	* a simpler version of the data structure is used there with only the
	28	* fields actually used by the vDSO.
	29	*
	30	*/
	31
	32	/*
	33	* If the major version changes we are incompatible.
	34	* Minor version changes are a hint.
	35	*/
	36	#define SYSTEMCFG_MAJOR 1
	37	#define SYSTEMCFG_MINOR 1
	38
	39	#ifndef __ASSEMBLY__
	40
	41	#include <linux/unistd.h>
	42
	43	#define SYSCALL_MAP_SIZE ((__NR_syscalls + 31) / 32)
	44
	45	/*
	46	* So here is the ppc64 backward compatible version
	47	*/
	48
	49	#ifdef CONFIG_PPC64
	50
	51	struct vdso_data {
	52	__u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */
	53	struct { /* Systemcfg version numbers */
	54	__u32 major; /* Major number 0x10 */
	55	__u32 minor; /* Minor number 0x14 */
	56	} version;
	57
e8222502 BH	58	/* Note about the platform flags: it now only contains the lpar
	59	* bit. The actual platform number is dead and burried
	60	*/
a7f290da BH	61	__u32 platform; /* Platform flags 0x18 */
	62	__u32 processor; /* Processor type 0x1C */
	63	__u64 processorCount; /* # of physical processors 0x20 */
	64	__u64 physicalMemorySize; /* Size of real memory(B) 0x28 */
	65	__u64 tb_orig_stamp; /* Timebase at boot 0x30 */
	66	__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
	67	__u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
	68	__u64 stamp_xsec; /* 0x48 */
	69	__u64 tb_update_count; /* Timebase atomicity ctr 0x50 */
	70	__u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
	71	__u32 tz_dsttime; /* Type of dst correction 0x5C */
	72	__u32 dcache_size; /* L1 d-cache size 0x60 */
	73	__u32 dcache_line_size; /* L1 d-cache line size 0x64 */
	74	__u32 icache_size; /* L1 i-cache size 0x68 */
	75	__u32 icache_line_size; /* L1 i-cache line size 0x6C */
	76
	77	/* those additional ones don't have to be located anywhere
	78	* special as they were not part of the original systemcfg
	79	*/
fbe48175 OJ	80	__u32 dcache_block_size; /* L1 d-cache block size */
	81	__u32 icache_block_size; /* L1 i-cache block size */
	82	__u32 dcache_log_block_size; /* L1 d-cache log block size */
	83	__u32 icache_log_block_size; /* L1 i-cache log block size */
0c37ec2a	84	__s32 wtom_clock_sec; /* Wall to monotonic clock */
a7f290da BH	85	__s32 wtom_clock_nsec;
	86	__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
	87	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
	88	};
	89
	90	#else /* CONFIG_PPC64 */
	91
	92	/*
	93	* And here is the simpler 32 bits version
	94	*/
	95	struct vdso_data {
	96	__u64 tb_orig_stamp; /* Timebase at boot 0x30 */
	97	__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
	98	__u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
	99	__u64 stamp_xsec; /* 0x48 */
	100	__u32 tb_update_count; /* Timebase atomicity ctr 0x50 */
	101	__u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
	102	__u32 tz_dsttime; /* Type of dst correction 0x5C */
	103	__s32 wtom_clock_sec; /* Wall to monotonic clock */
	104	__s32 wtom_clock_nsec;
	105	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
fbe48175 OJ	106	__u32 dcache_block_size; /* L1 d-cache block size */
	107	__u32 icache_block_size; /* L1 i-cache block size */
	108	__u32 dcache_log_block_size; /* L1 d-cache log block size */
	109	__u32 icache_log_block_size; /* L1 i-cache log block size */
a7f290da BH	110	};
	111
	112	#endif /* CONFIG_PPC64 */
	113
	114	#ifdef __KERNEL__
	115	extern struct vdso_data *vdso_data;
	116	#endif
	117
	118	#endif /* __ASSEMBLY__ */
	119
88ced031	120	#endif /* __KERNEL__ */
a7f290da	121	#endif /* _SYSTEMCFG_H */