diff options
Diffstat (limited to 'arch/sparc/include/asm/mmu_64.h')
| -rw-r--r-- | arch/sparc/include/asm/mmu_64.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/mmu_64.h b/arch/sparc/include/asm/mmu_64.h new file mode 100644 index 000000000..7e2704c77 --- /dev/null +++ b/arch/sparc/include/asm/mmu_64.h @@ -0,0 +1,129 @@ +/* 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 */ |