[linux-2.6-block.git] / arch / powerpc / include / asm / vdso_datapage.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#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.
 */


/*
 * 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>
#include <linux/time.h>
#include <vdso/datapage.h>

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

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

#ifdef CONFIG_PPC64

struct vdso_arch_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 buried
	 */
	__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;		/* (NU) Timebase at boot	0x30 */
	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
	__u64 tb_to_xs;			/* (NU) Inverse of TB to 2^20	0x40 */
	__u64 stamp_xsec;		/* (NU)				0x48 */
	__u64 tb_update_count;		/* (NU) Timebase atomicity ctr	0x50 */
	__u32 tz_minuteswest;		/* (NU) Min. west of Greenwich	0x58 */
	__u32 tz_dsttime;		/* (NU) 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 */
	__u32 syscall_map[SYSCALL_MAP_SIZE];	/* Map of syscalls  */
	__u32 compat_syscall_map[SYSCALL_MAP_SIZE];	/* Map of compat syscalls */

	struct vdso_data data[CS_BASES];
	struct vdso_rng_data rng_data;
};

#else /* CONFIG_PPC64 */

/*
 * And here is the simpler 32 bits version
 */
struct vdso_arch_data {
	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
	__u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
	__u32 compat_syscall_map[0];	/* No compat syscalls on PPC32 */
	struct vdso_data data[CS_BASES];
	struct vdso_rng_data rng_data;
};

#endif /* CONFIG_PPC64 */

extern struct vdso_arch_data *vdso_data;

#else /* __ASSEMBLY__ */

.macro get_datapage ptr
	bcl	20, 31, .+4
999:
	mflr	\ptr
	addis	\ptr, \ptr, (_vdso_datapage - 999b)@ha
	addi	\ptr, \ptr, (_vdso_datapage - 999b)@l
.endm

#include <asm/asm-offsets.h>
#include <asm/page.h>

.macro get_realdatapage ptr scratch
	get_datapage \ptr
#ifdef CONFIG_TIME_NS
	lwz	\scratch, VDSO_CLOCKMODE_OFFSET(\ptr)
	xoris	\scratch, \scratch, VDSO_CLOCKMODE_TIMENS@h
	xori	\scratch, \scratch, VDSO_CLOCKMODE_TIMENS@l
	cntlzw	\scratch, \scratch
	rlwinm	\scratch, \scratch, PAGE_SHIFT - 5, 1 << PAGE_SHIFT
	add	\ptr, \ptr, \scratch
#endif
.endm

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */
#endif /* _SYSTEMCFG_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
a7f290da BH	2	#ifndef _VDSO_DATAPAGE_H
a7f290da BH	3	#define _VDSO_DATAPAGE_H
88ced031	4	#ifdef __KERNEL__
a7f290da BH	5
	6	/*
	7	* Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
	8	* Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
	9	* IBM Corp.
a7f290da BH	10	*/
	11
	12
	13	/*
	14	* Note about this structure:
	15	*
	16	* This structure was historically called systemcfg and exposed to
	17	* userland via /proc/ppc64/systemcfg. Unfortunately, this became an
	18	* ABI issue as some proprietary software started relying on being able
	19	* to mmap() it, thus we have to keep the base layout at least for a
	20	* few kernel versions.
	21	*
	22	* However, since ppc32 doesn't suffer from this backward handicap,
	23	* a simpler version of the data structure is used there with only the
	24	* fields actually used by the vDSO.
	25	*
	26	*/
	27
	28	/*
	29	* If the major version changes we are incompatible.
	30	* Minor version changes are a hint.
	31	*/
	32	#define SYSTEMCFG_MAJOR 1
	33	#define SYSTEMCFG_MINOR 1
	34
	35	#ifndef __ASSEMBLY__
	36
	37	#include <linux/unistd.h>
597bc5c0	38	#include <linux/time.h>
ab037dd8	39	#include <vdso/datapage.h>
a7f290da	40
f43194e4	41	#define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32)
a7f290da BH	42
	43	/*
	44	* So here is the ppc64 backward compatible version
	45	*/
	46
	47	#ifdef CONFIG_PPC64
	48
ab037dd8	49	struct vdso_arch_data {
a7f290da BH	50	__u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */
	51	struct { /* Systemcfg version numbers */
	52	__u32 major; /* Major number 0x10 */
	53	__u32 minor; /* Minor number 0x14 */
	54	} version;
	55
e8222502	56	/* Note about the platform flags: it now only contains the lpar
25985edc	57	* bit. The actual platform number is dead and buried
e8222502	58	*/
a7f290da BH	59	__u32 platform; /* Platform flags 0x18 */
	60	__u32 processor; /* Processor type 0x1C */
	61	__u64 processorCount; /* # of physical processors 0x20 */
	62	__u64 physicalMemorySize; /* Size of real memory(B) 0x28 */
ab037dd8	63	__u64 tb_orig_stamp; /* (NU) Timebase at boot 0x30 */
a7f290da	64	__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
ab037dd8 CL	65	__u64 tb_to_xs; /* (NU) Inverse of TB to 2^20 0x40 */
	66	__u64 stamp_xsec; /* (NU) 0x48 */
	67	__u64 tb_update_count; /* (NU) Timebase atomicity ctr 0x50 */
	68	__u32 tz_minuteswest; /* (NU) Min. west of Greenwich 0x58 */
	69	__u32 tz_dsttime; /* (NU) Type of dst correction 0x5C */
a7f290da BH	70	__u32 dcache_size; /* L1 d-cache size 0x60 */
	71	__u32 dcache_line_size; /* L1 d-cache line size 0x64 */
	72	__u32 icache_size; /* L1 i-cache size 0x68 */
	73	__u32 icache_line_size; /* L1 i-cache line size 0x6C */
	74
	75	/* those additional ones don't have to be located anywhere
	76	* special as they were not part of the original systemcfg
	77	*/
fbe48175 OJ	78	__u32 dcache_block_size; /* L1 d-cache block size */
	79	__u32 icache_block_size; /* L1 i-cache block size */
	80	__u32 dcache_log_block_size; /* L1 d-cache log block size */
	81	__u32 icache_log_block_size; /* L1 i-cache log block size */
1bb30b7a CL	82	__u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
1bb30b7a CL	83	__u32 compat_syscall_map[SYSCALL_MAP_SIZE]; /* Map of compat syscalls */
ab037dd8 CL	84
ab037dd8 CL	85	struct vdso_data data[CS_BASES];
53cee505	86	struct vdso_rng_data rng_data;
a7f290da BH	87	};
	88
	89	#else /* CONFIG_PPC64 */
	90
	91	/*
	92	* And here is the simpler 32 bits version
	93	*/
ab037dd8	94	struct vdso_arch_data {
a7f290da	95	__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
1bb30b7a CL	96	__u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
1bb30b7a CL	97	__u32 compat_syscall_map[0]; /* No compat syscalls on PPC32 */
ab037dd8	98	struct vdso_data data[CS_BASES];
53cee505	99	struct vdso_rng_data rng_data;
a7f290da BH	100	};
	101
	102	#endif /* CONFIG_PPC64 */
	103
ab037dd8	104	extern struct vdso_arch_data *vdso_data;
a7f290da	105
ec0895f0 CL	106	#else /* __ASSEMBLY__ */
ec0895f0 CL	107
550e6074	108	.macro get_datapage ptr
ec0895f0	109	bcl 20, 31, .+4
591857b6	110	999:
ec0895f0	111	mflr \ptr
591857b6	112	addis \ptr, \ptr, (_vdso_datapage - 999b)@ha
591857b6	113	addi \ptr, \ptr, (_vdso_datapage - 999b)@l
ec0895f0 CL	114	.endm
ec0895f0 CL	115
c7304938 CL	116	#include <asm/asm-offsets.h>
	117	#include <asm/page.h>
	118
	119	.macro get_realdatapage ptr scratch
	120	get_datapage \ptr
	121	#ifdef CONFIG_TIME_NS
	122	lwz \scratch, VDSO_CLOCKMODE_OFFSET(\ptr)
	123	xoris \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@h
	124	xori \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@l
	125	cntlzw \scratch, \scratch
	126	rlwinm \scratch, \scratch, PAGE_SHIFT - 5, 1 << PAGE_SHIFT
	127	add \ptr, \ptr, \scratch
	128	#endif
	129	.endm
	130
a7f290da BH	131	#endif /* __ASSEMBLY__ */
a7f290da BH	132
88ced031	133	#endif /* __KERNEL__ */
a7f290da	134	#endif /* _SYSTEMCFG_H */