1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
#ifndef __MMU_H
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#define __MMU_H
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#include <linux/config.h>
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#include <asm/page.h>
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#include <asm/const.h>
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/*
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* For the 8k pagesize kernel, use only 10 hw context bits to optimize some
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* shifts in the fast tlbmiss handlers, instead of all 13 bits (specifically
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* for vpte offset calculation). For other pagesizes, this optimization in
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* the tlbhandlers can not be done; but still, all 13 bits can not be used
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* because the tlb handlers use "andcc" instruction which sign extends 13
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* bit arguments.
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*/
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#if PAGE_SHIFT == 13
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#define CTX_NR_BITS 10
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#else
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#define CTX_NR_BITS 12
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#endif
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#define TAG_CONTEXT_BITS ((_AC(1,UL) << CTX_NR_BITS) - _AC(1,UL))
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/* UltraSPARC-III+ and later have a feature whereby you can
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* select what page size the various Data-TLB instances in the
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* chip. In order to gracefully support this, we put the version
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* field in a spot outside of the areas of the context register
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* where this parameter is specified.
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*/
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#define CTX_VERSION_SHIFT 22
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#define CTX_VERSION_MASK ((~0UL) << CTX_VERSION_SHIFT)
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#define CTX_PGSZ_8KB _AC(0x0,UL)
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#define CTX_PGSZ_64KB _AC(0x1,UL)
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#define CTX_PGSZ_512KB _AC(0x2,UL)
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#define CTX_PGSZ_4MB _AC(0x3,UL)
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#define CTX_PGSZ_BITS _AC(0x7,UL)
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#define CTX_PGSZ0_NUC_SHIFT 61
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#define CTX_PGSZ1_NUC_SHIFT 58
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#define CTX_PGSZ0_SHIFT 16
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#define CTX_PGSZ1_SHIFT 19
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#define CTX_PGSZ_MASK ((CTX_PGSZ_BITS << CTX_PGSZ0_SHIFT) | \
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(CTX_PGSZ_BITS << CTX_PGSZ1_SHIFT))
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#if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
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#define CTX_PGSZ_BASE CTX_PGSZ_8KB
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#elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
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#define CTX_PGSZ_BASE CTX_PGSZ_64KB
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#elif defined(CONFIG_SPARC64_PAGE_SIZE_512KB)
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#define CTX_PGSZ_BASE CTX_PGSZ_512KB
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#elif defined(CONFIG_SPARC64_PAGE_SIZE_4MB)
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#define CTX_PGSZ_BASE CTX_PGSZ_4MB
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#else
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#error No page size specified in kernel configuration
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#endif
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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#define CTX_PGSZ_HUGE CTX_PGSZ_4MB
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
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#define CTX_PGSZ_HUGE CTX_PGSZ_512KB
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define CTX_PGSZ_HUGE CTX_PGSZ_64KB
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#endif
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#define CTX_PGSZ_KERN CTX_PGSZ_4MB
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/* Thus, when running on UltraSPARC-III+ and later, we use the following
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* PRIMARY_CONTEXT register values for the kernel context.
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*/
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#define CTX_CHEETAH_PLUS_NUC \
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((CTX_PGSZ_KERN << CTX_PGSZ0_NUC_SHIFT) | \
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(CTX_PGSZ_BASE << CTX_PGSZ1_NUC_SHIFT))
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#define CTX_CHEETAH_PLUS_CTX0 \
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((CTX_PGSZ_KERN << CTX_PGSZ0_SHIFT) | \
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(CTX_PGSZ_BASE << CTX_PGSZ1_SHIFT))
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/* If you want "the TLB context number" use CTX_NR_MASK. If you
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* want "the bits I program into the context registers" use
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* CTX_HW_MASK.
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*/
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#define CTX_NR_MASK TAG_CONTEXT_BITS
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#define CTX_HW_MASK (CTX_NR_MASK | CTX_PGSZ_MASK)
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#define CTX_FIRST_VERSION ((_AC(1,UL) << CTX_VERSION_SHIFT) + _AC(1,UL))
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#define CTX_VALID(__ctx) \
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(!(((__ctx.sparc64_ctx_val) ^ tlb_context_cache) & CTX_VERSION_MASK))
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#define CTX_HWBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_HW_MASK)
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#define CTX_NRBITS(__ctx) ((__ctx.sparc64_ctx_val) & CTX_NR_MASK)
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long sparc64_ctx_val;
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} mm_context_t;
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#endif /* !__ASSEMBLY__ */
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#endif /* __MMU_H */
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