mirror of https://gitee.com/openkylin/linux.git
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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[0];
|
|
};
|
|
} __attribute__((packed));
|
|
|
|
struct mpx_bt_entry {
|
|
union {
|
|
char x[MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES];
|
|
unsigned long contents[0];
|
|
};
|
|
} __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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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];
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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];
|
|
}
|
|
|
|
#endif /* _MPX_HW_H */
|