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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __MMU_H
#define __MMU_H
#include <linux/const.h>
#include <asm/page.h>
#include <asm/hypervisor.h>
#define CTX_NR_BITS 13
#define TAG_CONTEXT_BITS ((_AC(1,UL) << CTX_NR_BITS) - _AC(1,UL))
/* UltraSPARC-III+ and later have a feature whereby you can
* select what page size the various Data-TLB instances in the
* chip. In order to gracefully support this, we put the version
* field in a spot outside of the areas of the context register
* where this parameter is specified.
*/
#define CTX_VERSION_SHIFT 22
#define CTX_VERSION_MASK ((~0UL) << CTX_VERSION_SHIFT)
#define CTX_PGSZ_8KB _AC(0x0,UL)
#define CTX_PGSZ_64KB _AC(0x1,UL)
#define CTX_PGSZ_512KB _AC(0x2,UL)
#define CTX_PGSZ_4MB _AC(0x3,UL)
#define CTX_PGSZ_BITS _AC(0x7,UL)
#define CTX_PGSZ0_NUC_SHIFT 61
#define CTX_PGSZ1_NUC_SHIFT 58
#define CTX_PGSZ0_SHIFT 16
#define CTX_PGSZ1_SHIFT 19
#define CTX_PGSZ_MASK ((CTX_PGSZ_BITS << CTX_PGSZ0_SHIFT) | \
(CTX_PGSZ_BITS << CTX_PGSZ1_SHIFT))
#define CTX_PGSZ_BASE CTX_PGSZ_8KB
#define CTX_PGSZ_HUGE CTX_PGSZ_4MB
#define CTX_PGSZ_KERN CTX_PGSZ_4MB
/* Thus, when running on UltraSPARC-III+ and later, we use the following
* PRIMARY_CONTEXT register values for the kernel context.
*/
#define CTX_CHEETAH_PLUS_NUC \
((CTX_PGSZ_KERN << CTX_PGSZ0_NUC_SHIFT) | \
(CTX_PGSZ_BASE << CTX_PGSZ1_NUC_SHIFT))
#define CTX_CHEETAH_PLUS_CTX0 \
((CTX_PGSZ_KERN << CTX_PGSZ0_SHIFT) | \
(CTX_PGSZ_BASE << CTX_PGSZ1_SHIFT))
/* If you want "the TLB context number" use CTX_NR_MASK. If you
* want "the bits I program into the context registers" use
* CTX_HW_MASK.
*/
#define CTX_NR_MASK TAG_CONTEXT_BITS
#define CTX_HW_MASK (CTX_NR_MASK | CTX_PGSZ_MASK)
#define CTX_FIRST_VERSION BIT(CTX_VERSION_SHIFT)
#define CTX_VALID(__ctx) \
(!(((__ctx.sparc64_ctx_val) ^ tlb_context_cache) & CTX_VERSION_MASK))
#define CTX_HWBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_HW_MASK)
#define CTX_NRBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_NR_MASK)
#ifndef __ASSEMBLY__
#define TSB_ENTRY_ALIGNMENT 16
struct tsb {
unsigned long tag;
unsigned long pte;
} __attribute__((aligned(TSB_ENTRY_ALIGNMENT)));
void __tsb_insert(unsigned long ent, unsigned long tag, unsigned long pte);
void tsb_flush(unsigned long ent, unsigned long tag);
void tsb_init(struct tsb *tsb, unsigned long size);
struct tsb_config {
struct tsb *tsb;
unsigned long tsb_rss_limit;
unsigned long tsb_nentries;
unsigned long tsb_reg_val;
unsigned long tsb_map_vaddr;
unsigned long tsb_map_pte;
};
#define MM_TSB_BASE 0
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
#define MM_TSB_HUGE 1
#define MM_NUM_TSBS 2
#else
#define MM_NUM_TSBS 1
#endif
/* ADI tags are stored when a page is swapped out and the storage for
* tags is allocated dynamically. There is a tag storage descriptor
* associated with each set of tag storage pages. Tag storage descriptors
* are allocated dynamically. Since kernel will allocate a full page for
* each tag storage descriptor, we can store up to
* PAGE_SIZE/sizeof(tag storage descriptor) descriptors on that page.
*/
typedef struct {
unsigned long start; /* Start address for this tag storage */
unsigned long end; /* Last address for tag storage */
unsigned char *tags; /* Where the tags are */
unsigned long tag_users; /* number of references to descriptor */
} tag_storage_desc_t;
typedef struct {
spinlock_t lock;
unsigned long sparc64_ctx_val;
unsigned long hugetlb_pte_count;
unsigned long thp_pte_count;
struct tsb_config tsb_block[MM_NUM_TSBS];
struct hv_tsb_descr tsb_descr[MM_NUM_TSBS];
void *vdso;
bool adi;
tag_storage_desc_t *tag_store;
spinlock_t tag_lock;
} mm_context_t;
#endif /* !__ASSEMBLY__ */
#define TSB_CONFIG_TSB 0x00
#define TSB_CONFIG_RSS_LIMIT 0x08
#define TSB_CONFIG_NENTRIES 0x10
#define TSB_CONFIG_REG_VAL 0x18
#define TSB_CONFIG_MAP_VADDR 0x20
#define TSB_CONFIG_MAP_PTE 0x28
#endif /* __MMU_H */