mirror of
https://github.com/holub/mame
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202d7680a4
space by index. Update functions and methods that accepted an address space index to take an address_spacenum instead. Note that this means you can't use a raw integer in ADDRESS_SPACE macros, so instead of 0 use the enumerated AS_0. Standardized the project on the shortened constants AS_* over the older ADDRESS_SPACE_*. Removed the latter to prevent confusion. Also centralized the location of these definitions to memory.h.
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/***************************************************************************
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vtlb.h
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Generic virtual TLB implementation.
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Copyright Aaron Giles
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Released for general non-commercial use under the MAME license
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Visit http://mamedev.org for licensing and usage restrictions.
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***************************************************************************/
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#pragma once
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#ifndef __VTLB_H__
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#define __VTLB_H__
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/***************************************************************************
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CONSTANTS
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***************************************************************************/
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#define VTLB_FLAGS_MASK 0xff
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#define VTLB_READ_ALLOWED 0x01 /* (1 << TRANSLATE_READ) */
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#define VTLB_WRITE_ALLOWED 0x02 /* (1 << TRANSLATE_WRITE) */
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#define VTLB_FETCH_ALLOWED 0x04 /* (1 << TRANSLATE_FETCH) */
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#define VTLB_FLAG_VALID 0x08
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#define VTLB_USER_READ_ALLOWED 0x10 /* (1 << TRANSLATE_READ_USER) */
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#define VTLB_USER_WRITE_ALLOWED 0x20 /* (1 << TRANSLATE_WRITE_USER) */
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#define VTLB_USER_FETCH_ALLOWED 0x40 /* (1 << TRANSLATE_FETCH_USER) */
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#define VTLB_FLAG_FIXED 0x80
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/***************************************************************************
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TYPE DEFINITIONS
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***************************************************************************/
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/* represents an entry in the VTLB */
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typedef UINT32 vtlb_entry;
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/* opaque structure describing VTLB state */
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typedef struct _vtlb_state vtlb_state;
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/***************************************************************************
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FUNCTION PROTOTYPES
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***************************************************************************/
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/* ----- initialization/teardown ----- */
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/* allocate a new VTLB for the given CPU */
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vtlb_state *vtlb_alloc(device_t *cpu, address_spacenum space, int fixed_entries, int dynamic_entries);
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/* free an allocated VTLB */
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void vtlb_free(vtlb_state *vtlb);
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/* ----- filling ----- */
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/* called by the CPU core in response to an unmapped access */
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int vtlb_fill(vtlb_state *vtlb, offs_t address, int intention);
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/* load a fixed VTLB entry */
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void vtlb_load(vtlb_state *vtlb, int entrynum, int numpages, offs_t address, vtlb_entry value);
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/* ----- flushing ----- */
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/* flush all knowledge from the dynamic part of the VTLB */
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void vtlb_flush_dynamic(vtlb_state *vtlb);
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/* flush knowledge of a particular address from the VTLB */
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void vtlb_flush_address(vtlb_state *vtlb, offs_t address);
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/* ----- accessors ----- */
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/* return a pointer to the base of the linear VTLB lookup table */
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const vtlb_entry *vtlb_table(vtlb_state *vtlb);
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#endif /* __VTLB_H__ */
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