Release 4.10 tools/testing/selftests/x86/mpx-hw.h

#ifndef _MPX_HW_H

#define _MPX_HW_H

#include <assert.h>

/* Describe the MPX Hardware Layout in here */


#define NR_MPX_BOUNDS_REGISTERS 4

#ifdef __i386__


#define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES	16 
/* 4 * 32-bits */

#define MPX_BOUNDS_TABLE_SIZE_BYTES		(1ULL << 14) 
/* 16k */

#define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES		4

#define MPX_BOUNDS_DIR_SIZE_BYTES		(1ULL << 22) 
/* 4MB */


#define MPX_BOUNDS_TABLE_BOTTOM_BIT		2

#define MPX_BOUNDS_TABLE_TOP_BIT		11

#define MPX_BOUNDS_DIR_BOTTOM_BIT		12

#define MPX_BOUNDS_DIR_TOP_BIT			31

#else

/*
 * Linear Address of "pointer" (LAp)
 *   0 ->  2: ignored
 *   3 -> 19: index in to bounds table
 *  20 -> 47: index in to bounds directory
 *  48 -> 63: ignored
 */


#define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES	32

#define MPX_BOUNDS_TABLE_SIZE_BYTES		(1ULL << 22) 
/* 4MB */

#define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES		8

#define MPX_BOUNDS_DIR_SIZE_BYTES		(1ULL << 31) 
/* 2GB */


#define MPX_BOUNDS_TABLE_BOTTOM_BIT		3

#define MPX_BOUNDS_TABLE_TOP_BIT		19

#define MPX_BOUNDS_DIR_BOTTOM_BIT		20

#define MPX_BOUNDS_DIR_TOP_BIT			47

#endif


#define MPX_BOUNDS_DIR_NR_ENTRIES	\
	(MPX_BOUNDS_DIR_SIZE_BYTES/MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES)

#define MPX_BOUNDS_TABLE_NR_ENTRIES	\
	(MPX_BOUNDS_TABLE_SIZE_BYTES/MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES)


#define MPX_BOUNDS_TABLE_ENTRY_VALID_BIT	0x1


struct mpx_bd_entry {
	union {
		
char x[MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES];
		
void *contents[1];
	};
} __attribute__((packed));


struct mpx_bt_entry {
	union {
		
char x[MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES];
		
unsigned long contents[1];
	};
} __attribute__((packed));


struct mpx_bounds_dir {
	
struct mpx_bd_entry entries[MPX_BOUNDS_DIR_NR_ENTRIES];
} __attribute__((packed));


struct mpx_bounds_table {
	
struct mpx_bt_entry entries[MPX_BOUNDS_TABLE_NR_ENTRIES];
} __attribute__((packed));



static inline unsigned long GET_BITS(unsigned long val, int bottombit, int topbit)
{
	int total_nr_bits = topbit - bottombit;
	unsigned long mask = (1UL << total_nr_bits)-1;
	return (val >> bottombit) & mask;
}

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static inline unsigned long __vaddr_bounds_table_index(void *vaddr)
{
	return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_TABLE_BOTTOM_BIT,
					      MPX_BOUNDS_TABLE_TOP_BIT);
}

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static inline unsigned long __vaddr_bounds_directory_index(void *vaddr)
{
	return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_DIR_BOTTOM_BIT,
					      MPX_BOUNDS_DIR_TOP_BIT);
}

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static inline struct mpx_bd_entry *mpx_vaddr_to_bd_entry(void *vaddr,
		struct mpx_bounds_dir *bounds_dir)
{
	unsigned long index = __vaddr_bounds_directory_index(vaddr);
	return &bounds_dir->entries[index];
}

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static inline int bd_entry_valid(struct mpx_bd_entry *bounds_dir_entry)
{
	unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents;
	return (__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT);
}

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static inline struct mpx_bounds_table *

__bd_entry_to_bounds_table(struct mpx_bd_entry *bounds_dir_entry)
{
	unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents;
	assert(__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT);
	__bd_entry &= ~MPX_BOUNDS_TABLE_ENTRY_VALID_BIT;
	return (struct mpx_bounds_table *)__bd_entry;
}

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static inline struct mpx_bt_entry *

mpx_vaddr_to_bt_entry(void *vaddr, struct mpx_bounds_dir *bounds_dir)
{
	struct mpx_bd_entry *bde = mpx_vaddr_to_bd_entry(vaddr, bounds_dir);
	struct mpx_bounds_table *bt = __bd_entry_to_bounds_table(bde);
	unsigned long index = __vaddr_bounds_table_index(vaddr);
	return &bt->entries[index];
}

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#endif /* _MPX_HW_H */
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Directory: tools/testing/selftests/x86

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