/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MPX_HW_H
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#define _MPX_HW_H
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#include <assert.h>
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/* Describe the MPX Hardware Layout in here */
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#define NR_MPX_BOUNDS_REGISTERS 4
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#ifdef __i386__
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#define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 16 /* 4 * 32-bits */
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#define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 14) /* 16k */
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#define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 4
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#define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 22) /* 4MB */
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#define MPX_BOUNDS_TABLE_BOTTOM_BIT 2
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#define MPX_BOUNDS_TABLE_TOP_BIT 11
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#define MPX_BOUNDS_DIR_BOTTOM_BIT 12
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#define MPX_BOUNDS_DIR_TOP_BIT 31
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#else
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/*
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* Linear Address of "pointer" (LAp)
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* 0 -> 2: ignored
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* 3 -> 19: index in to bounds table
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* 20 -> 47: index in to bounds directory
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* 48 -> 63: ignored
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*/
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#define MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES 32
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#define MPX_BOUNDS_TABLE_SIZE_BYTES (1ULL << 22) /* 4MB */
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#define MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES 8
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#define MPX_BOUNDS_DIR_SIZE_BYTES (1ULL << 31) /* 2GB */
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#define MPX_BOUNDS_TABLE_BOTTOM_BIT 3
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#define MPX_BOUNDS_TABLE_TOP_BIT 19
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#define MPX_BOUNDS_DIR_BOTTOM_BIT 20
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#define MPX_BOUNDS_DIR_TOP_BIT 47
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#endif
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#define MPX_BOUNDS_DIR_NR_ENTRIES \
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(MPX_BOUNDS_DIR_SIZE_BYTES/MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES)
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#define MPX_BOUNDS_TABLE_NR_ENTRIES \
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(MPX_BOUNDS_TABLE_SIZE_BYTES/MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES)
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#define MPX_BOUNDS_TABLE_ENTRY_VALID_BIT 0x1
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struct mpx_bd_entry {
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union {
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char x[MPX_BOUNDS_DIR_ENTRY_SIZE_BYTES];
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void *contents[0];
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};
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} __attribute__((packed));
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struct mpx_bt_entry {
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union {
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char x[MPX_BOUNDS_TABLE_ENTRY_SIZE_BYTES];
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unsigned long contents[0];
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};
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} __attribute__((packed));
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struct mpx_bounds_dir {
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struct mpx_bd_entry entries[MPX_BOUNDS_DIR_NR_ENTRIES];
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} __attribute__((packed));
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struct mpx_bounds_table {
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struct mpx_bt_entry entries[MPX_BOUNDS_TABLE_NR_ENTRIES];
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} __attribute__((packed));
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static inline unsigned long GET_BITS(unsigned long val, int bottombit, int topbit)
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{
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int total_nr_bits = topbit - bottombit;
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unsigned long mask = (1UL << total_nr_bits)-1;
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return (val >> bottombit) & mask;
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}
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static inline unsigned long __vaddr_bounds_table_index(void *vaddr)
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{
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return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_TABLE_BOTTOM_BIT,
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MPX_BOUNDS_TABLE_TOP_BIT);
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}
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static inline unsigned long __vaddr_bounds_directory_index(void *vaddr)
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{
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return GET_BITS((unsigned long)vaddr, MPX_BOUNDS_DIR_BOTTOM_BIT,
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MPX_BOUNDS_DIR_TOP_BIT);
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}
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static inline struct mpx_bd_entry *mpx_vaddr_to_bd_entry(void *vaddr,
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struct mpx_bounds_dir *bounds_dir)
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{
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unsigned long index = __vaddr_bounds_directory_index(vaddr);
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return &bounds_dir->entries[index];
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}
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static inline int bd_entry_valid(struct mpx_bd_entry *bounds_dir_entry)
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{
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unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents;
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return (__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT);
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}
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static inline struct mpx_bounds_table *
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__bd_entry_to_bounds_table(struct mpx_bd_entry *bounds_dir_entry)
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{
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unsigned long __bd_entry = (unsigned long)bounds_dir_entry->contents;
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assert(__bd_entry & MPX_BOUNDS_TABLE_ENTRY_VALID_BIT);
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__bd_entry &= ~MPX_BOUNDS_TABLE_ENTRY_VALID_BIT;
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return (struct mpx_bounds_table *)__bd_entry;
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}
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static inline struct mpx_bt_entry *
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mpx_vaddr_to_bt_entry(void *vaddr, struct mpx_bounds_dir *bounds_dir)
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{
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struct mpx_bd_entry *bde = mpx_vaddr_to_bd_entry(vaddr, bounds_dir);
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struct mpx_bounds_table *bt = __bd_entry_to_bounds_table(bde);
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unsigned long index = __vaddr_bounds_table_index(vaddr);
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return &bt->entries[index];
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}
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#endif /* _MPX_HW_H */
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