2ca8cf7389
This reworks the context management code used by 4xx,8xx and freescale BookE. It adds support for SMP by implementing a concept of stale context map to lazily flush the TLB on processors where a context may have been invalidated. This also contains the ground work for generalizing such lazy TLB flushing by just picking up a new PID and marking the old one stale. This will be implemented later. This is a first implementation that uses a global spinlock. Ideally, we should try to get at least the fast path (context ID already assigned) lockless or limited to a per context lock, but for now this will do. I tried to keep the UP case reasonably simple to avoid adding too much overhead to 8xx which does a lot of context stealing since it effectively has only 16 PIDs available. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
#ifndef _ASM_POWERPC_MMU_40X_H_
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#define _ASM_POWERPC_MMU_40X_H_
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/*
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* PPC40x support
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*/
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#define PPC40X_TLB_SIZE 64
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/*
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* TLB entries are defined by a "high" tag portion and a "low" data
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* portion. On all architectures, the data portion is 32-bits.
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*
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* TLB entries are managed entirely under software control by reading,
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* writing, and searchoing using the 4xx-specific tlbre, tlbwr, and tlbsx
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* instructions.
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*/
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#define TLB_LO 1
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#define TLB_HI 0
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#define TLB_DATA TLB_LO
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#define TLB_TAG TLB_HI
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/* Tag portion */
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#define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */
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#define TLB_PAGESZ_MASK 0x00000380
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#define TLB_PAGESZ(x) (((x) & 0x7) << 7)
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#define PAGESZ_1K 0
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#define PAGESZ_4K 1
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#define PAGESZ_16K 2
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#define PAGESZ_64K 3
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#define PAGESZ_256K 4
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#define PAGESZ_1M 5
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#define PAGESZ_4M 6
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#define PAGESZ_16M 7
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#define TLB_VALID 0x00000040 /* Entry is valid */
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/* Data portion */
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#define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */
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#define TLB_PERM_MASK 0x00000300
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#define TLB_EX 0x00000200 /* Instruction execution allowed */
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#define TLB_WR 0x00000100 /* Writes permitted */
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#define TLB_ZSEL_MASK 0x000000F0
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#define TLB_ZSEL(x) (((x) & 0xF) << 4)
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#define TLB_ATTR_MASK 0x0000000F
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#define TLB_W 0x00000008 /* Caching is write-through */
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#define TLB_I 0x00000004 /* Caching is inhibited */
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#define TLB_M 0x00000002 /* Memory is coherent */
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#define TLB_G 0x00000001 /* Memory is guarded from prefetch */
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned int id;
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unsigned int active;
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unsigned long vdso_base;
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} mm_context_t;
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_POWERPC_MMU_40X_H_ */
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